Hp Car Stereo System 3490A Users Manual

3490A to the manual 099e4e8a-d632-4bb5-aded-017e2f4dd5c2

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HEWLETT

PACKARD

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HEWLE"WPACKARD

C ER T IF IC A T O
I tII
The Hewlett-Paclnrd Companycertifins that this instrammt was
thoroughly tested,ond.inspectedand fourd to meet its pu,blished
specificationswhm it wasshippedlrom the factorU.The HewlettPaclard Com,panyfurther certifies tlmt its calibration rneo$rem,mts are traceableto the U.S. Natiornl Bureau of Standardsto
tlrc ertmt allowed by the Brneau's calibrationfacility.

W A R R A ] T TAYT D A S S I S T A I T C E
All Hewlett-Packardproducts are warranted against defects in
materialsand workrnanship."'This
warranty appliesfor one year
from the date of delivery, or, in'the caseof certain major components listed in the operating manual,for the specifiedperiod.We
will repair or replaceproductswhich prove to be defectiveduring
the warranty period providedthey are returned to HewlettPackard.No other warranty is expressedor implied. We are not
liable for consequentialdamages.
Servicecontractsor customerassistanceagreementsare available
for Hewlett-Packardproductsthat require maintenanceand repair on-site.
For any assistance,
contactyour nearestHewlett-PackardSalesand
ServiceOffice. Addressesare providedat the back of this manual.

v
OPERATING
AITDSERYICEMAIIUAI
ManualPartNo. 03490-90014
MicrofichePartNo. 03490-90064

M O D E3L4 9 0 A
M UtTIM ETER

The main body of this manualappliesto
SerialPrefix 1211A
!;:,'
;.t; .:

:i; : -:
'.
!:.. "

::::

Any changesmade in instrumentsmanufacturedafter this
printing will be found in a "Manual Changes"supplement
supplied with this manual. Be sure. to examine this
supplement,if one exists for this manual, for any changes
which apply to your instrument and recordthesechangesin
the manual. Backdatinginformationfor instrumentsmanufactured before this printing will be found in SectionVIII.

CopyrightHewlett-Pack
afi Company| 972
P.O.Box 301, l,oveland,Colorado 80537 U.S.A

Printed:APRIL 1974

Tableof Contents

Model3490A

TABLE
O FCONTENTS
Section
GENERALINFORMATION...
I.
Introduction
l-1.
l - 5 . S p e c i f i c a t i o .n.s. .
l-8. Options
l-10. AccessoriesSupplied
l-12. AccessoriesAvailable
l-14. Instrument and Manual
Identification

Page
......I-1
...1-l
.'-.l-l
-......1-1
...1-l
...1-1
......1-2

Page
Section
.
.
.
.
.
.2-I
.
.
A
N
D
I
N
T
E
R
F
A
C
E
INSTALLATION
II.
..-2-l
Introduction
2-l....2-l
2-3. Initiallnspection..
- . .2-l
2-5. PowerRequirements
.
.
.
.
.
..2-l
P
o
w
e
r
C
o
r
d
s
a
n
d
R
e
c
e
p
t
a
c
l
e
s
2-8.
2 - 1 0 . G r o u n d i n g R e q u i r e m e n t s. ... . . . . - . . 2 - 1
2-14. EnvironmentalRequirements . . . . - . . . 2-l
....2-2
2-16. Installation
-...2-2
2-17. BenchUse
-...2-2
.
.
.
.
R
a
c
k
M
o
u
n
t
i
n
g
.
.
.
.
2-19.
.... -...2-2
2-21. Installationofoptions
IsolatedData OutPut
2-23.
O p t i o n0 2 1 ( - h p l l l 2 l A ) . . . . . . . . 2 - 2
Isolated
Remote OPtionO22
2-25.
---..2-2
(hpllr22{).
2 - 2 7 . O p t i o n 0 5 0 a n d O p t i o n 0 6. .0 . . . . . - 2 - 3
...'....2-3
2-29. InterfaceConnections
.. . -2:2
021
OPtion
Data
Output
2-30.
2 - 3 2 . R e m o t e C o n t r o l O p t i o0n2 2 . . . . . - . - 2 - 3
. . .24
RearInput
2-34.
GeneralPurposeInterfaceBus
2-36.
...'-..24
Connections
......2-6
2-38. InterfaceCableLength
TriggerConnections,
24O
.......2-8
GPIBOption030
-'-''
242.
Sample/HoldConnections,
. .. . .. . .2-8
O p t i o nU O | O 4 |
.....2-9
246. RepackagingforShipment
Page
Section
..
.
.
..3-I
Iil.
INSTRUCTIONS.
OPERATING
...3-1
3-1. Introduction
--...'.3-l
3-3. InstrumentCapabilities
....'...3-1
3-4Standardlnstrument
3-6.
Output and RemoteControl Options .3-l
3-9.
Sample/HoldOption 040 or &15 . ' . .3-1
.. .. . . . .3-l
3-ll.
R a t i oO p t i o n0 8 0 . .
3-13. Front and RearPanelDescription . - . . -3-l
3 - 1 5 . M a d m u m l n p u t V o l t a g .e. s. . . . . . . . . 3 - l
3 - 1 7 . G e n e r aO
l p e r a t i n g l n s t r u c t i o n. s- . . . . . 3 - 2
......3-2
3-18. Turn-OnandWarm-Up
.....3'2
3-20. Guarding
. .t.s . . . . . - . 3 - 2
3 - 2 4 . F l o a t i n g M e a s u r e m .e. n
3-26.
OverrangeMeasurements. . . . . . . . . - 3-3
........3-3
3-28. Overloadlndication
...-....3-3
3 - 3 0 . R a n g e l n d i c a t i o. n
.
........3-3
3-32. Functionlndication

SectionIII (cont'd)
Page
........3-3
3-34. Autoranging
......3-3
3-36. ManualTrigger
....3-3
3-38. Self-TestOperation
. .t.s. . . . . .
3-3
3 4 0 . D C V o l t a g e M e a s u r e m .e. n
DC SampleRate and
342.
....34
ResponseTime.
.. .. ... .34
I n p u t R e s i s t a n c. .e .
344.
346. ACVoltageMeasurements .....34
348.
AC SampleRate and
....34
ResponseTime.
...34
3-50. FrequencyRange.
........34
3 - 5 2 . I n p u t l m p e d a n c. .e
........34
3-54. HarmonicDistortion
. . . . . . . . . . . .34
Measurements
3-56. Resistance
........3-5
3 - 5 8 . I n p u t C o n n e c t i o n. s
3-60.
Ohms SignalVoltageand Current . . . . 3-5
3-62OhmmeterSampleRate and
....3-5
ResponseTime.
3-64. External Trigger(Option 020) . . .. . . . . 3-5
. . .3-5
3-66. Data Output (Option O2l) . .
. . . . 3-5
3-68.
Output Signalsand l,evels
. . . . .34
3-71.
Input Sigralsand hvels
. .. . . . .3-6
3-73.
Data Output Isolation
3-75. RemoteControl(Option 022) .. .. . . . .34
3 - 7 7 . I n p u t S i g n aRl e q u i r e m e n.t.s. . . . . . . 3 4
......36
3-79. OutputSignals
3-81.
RemoteProgrammingProcedure . . . .34
3-83.
RemoteControl of Test Function . . .34
. . . .34
3-85.
RemoteControl Isolation
3-81. GeneralPurposeInterfaceBus
........3-7
I / O ( O p t i o n 0 3 0.)
. . . .3-7
3-90.
GPIB Bus Signals
3-101. Talk Only (No Controller) . . . . . . . . . 3-8
.. . . .3-8
3 - 1 0 3 . G P I BC o n t r o lo f 3 4 9 0 A
. . . 3-13
3-131. GPIB OperatingExample
':
3-136. Control by Marked Card
.....-3-14
Programmer
3-139. Sample/HoldMeasurements
. . . .3-15
( O p t i o n0 4 0 o r 0 4 5 ) . .
3-140. Definition of Sample/HoldTerms . . . 3-15
3-152. SpecialS/H Operating
......3-16
C o n s i d e r a t i o. .n. s.
3-156. Guard Connectionin Sample/Hold
......3-16
M e a s u r e m e.n. t. s. .
. .. .3-16
3-158. Input SignalLimitations
3-160. Sample/HoldTriggerSignal
.....'3-16
R e q u i r e m e .n. t. s. .
3-165. Initiating a Sample/Hold
.... -3-17
Measurement
3 - 1 7 3 . U s i n g t h eT r a c k / H o l d M o d e. . . . . . . 3 - 1 8
3-179. Using the Acquire/HoldMode . . . . .3-20
3-182. Using 50 Hz or 60 Hz Power Source . 3-21
(Option080). . . .3-21
3-184. Ratio Measurements
Veo l t a g e s- - - . . . . 3 - 2 1
R
e
f
e
r
e
n
c
E
x
t
e
r
n
a
l
3-186.
.......3-21
3 - 1 8 8 . I n p u t C o n n e c t i o n. s
......3'21
3-190. RatioDisplaY
.' - - -3-21
3-192. RatioMeasurementProcedure
iii

Table of Contents

Model34904

(Gont'd)
TABLE0F C0NTENTS
Section
page
Page
SectionIV (cont'd)
IV.
T H E O R Y O F O P E R A T I .O N
........4-I
4 - 1 3 0P
. o w e r S u p p l i .e. s.
...4-15
4-1. Introduction
...4-l
4-132.Self-TestFunction
....4-16
4-3. General
Theoryof Operation
. . .4-l
4 - 1 3 4 . L o g i c T e s t , NIo ..
..+16
4-5.
SignalConditioningCircuits . . . . . . . . 4-l
+ 1 3 7 . l O V R a n g e Z e r o , T e s t2N .o... . . . + 1 7
4-7.
ReferenceVoltages
...4-l
4-139. TurnoverError,
TestNo.3 . ....... 4-17
4-9.
D CA m p l i f i e r
...... .4-l
+141. f ReferenceCheck,Te4
stN
. . .o. . 4 - 1 7
4-ll.
Analog-to-Dgital
Converter. . . . .. . . 4-l
4 - 1 4 3 . 0 . 1V R a n g e Z e r o , T e s t N
5 o. . . . . . 4 - 1 7
4 - 1 3 . L o g r c.
......4-l
4-145. x.0l Atten.,x 100Gain,
4-15. Display
......4:2
TestNo.6....
..4-17
4-17.
Rangeand FunctionControl . . . - . . . 4-2
+ 1 4 7 . O h m sR e f e r e n c e , T e s t7N.o. . . . . . 4 - 1 7
4-19. DC AnalogCircuits
.. - .4-2
4-149.BCDRemoteExpandOption020
4 : 2 1 . I n p u t A t t e n u a t.o. r
........4-z
(FigureT-31)
.....4-t7
4 - 2 3 . D CA m p l i f i e r
. ..... .+3
4-150. OutguardPowerSupply
- . . .4-l,l
4 - 2 5 . D CA m p l i f i eGr a i n.
... .....4-3
4-152. IsolatedTriggerandHold
. . . zt-18
4-27. SwitchingCircuits
....4-3
4-154. Sample/HoldTriggerCircuits
. .. .. . 4-18
4-29. BootstrapCircuit
....4-3
4-158.DataOutputOption021 ..
. . .4-18
4-31. Reference
Voltages
. . .4-3
+ 1 6 0 . D a t a M u l t i p l e x. e. r s
.......4-18
4-33. OverloadProtection ........43
4-162. DataOutputSequential
Logic ..... 4-18
4 - 3 5 . L e a k a gCeo n t r o l
.....43
4-164. DataClock
. . +lg
4-37. DC AmplifierAuto Zero
. . . . .4-3
+166. Isolation
Assembly
. .4-18
4-39. Integrator
Circuits
. .. . .4-s
4 - 1 6 8 . S h i f t R e g i s t e. .r.s.
.......4-19
440.
Dual-Slope
Integration
.. .,..4-s
+170. DataFlag
...+19
42.
IntegratingAmplifier .......4-5
4-172.PrinterHold.
......+19
4 44. x 20 Amplifiet-..
. . .M
4-174.Remote
ControlOption022 . .. . . .. .+19
446.
ZeroDelectAmplifier
......M
4-176. Circuitlsolation
-...+19
4-48. ElectronicSwitch
....M
+178. RemoteEnable
...-.+19
4-50. Integrator
Auto Zero
. . - ... .44
4-180. OutguardMultiplexer ......+19
4-52. AC Converter
. . .44
4-182. RemoteSequential
Logrc .
. - 4-19
4-54. AC Attenuators
..
...44
4 - 1 8 4 . P r o g r aF
ml a g .
... -.+19
4-56. ConverterAmplifier ........44
+186. DataClock
. .4-20
4-58. RectifierandFilter
. . . +7
4 - 1 8 8 . S h i f tR e g i s t e r s
.....4-20
440. OhmsConverter....
.
...*7
+19O. Local/RemoteMultiplexers
. ......4-20
442.
CunentSource
......4-7
4-192. Local/RemoteFlip-Flop ....+2O
444.
Ohmmeter
PowerSupply
. . . .4-7 ,"
4:194. DataFlag
. . .4-20
4-66. OhmmeterReference .......+g
4-196.GeneralPurpose
InterfaceBus
448. InputProtection...
..+9.
I/O (Option030) .
.. .. . . .4-20
4 : 7 0 . D s p l a yA s s e m b(lF
y i g u r7e- 2 7 ) . . . . . . . 4 4
+198. GPIBSystem
......4-20
4 - 7 1 . D i s p l aUy n i t s.
......4-g
4-201. BasicTheoryof GPIBI/O Circuits . . +21
4-73. ScanGenerator.... ........+g
4-204. GPIBSystemOperation
. . . .4-21
4-75. ScanDecoder
.......4-8
4-212. Sample/Hold
Option040 or 045 . . . . .4-22
4-77. PolarityDisplay
.....4-8
+214. Track/Hold
Mode.
. .4-22
4-79.
DecimalsandAnnunciators . . . . . . . . 4-B
+ 2 1 6 . A c q u i r e / H o l d M o.d e
......4-22
4 - 8 1 . I n g i c C i r c u i t. s. . .
....4-8
4-218. Sample/HoldMeasurement
442. Clock.
......43
Sequence
..+22
444. DataCounter
.......+9
4-221. Sample/HoldAnalogCircuits
... ...4-23
4-86. Buffers
......+9
4-228. Sample/Hold
LogicCircuits . . . . . . . +25
+88.
TimingCounter
. .. . . +9
4-90. AlgorithmicStateMachine. . . . . . . . +ll
Section
Pase
4-105. InputPolarityStorage
.. . . . 4_12 V . M A I N T E N A N C. .E.
... . s]r
4-107. TransferandZeroDetect
. . . 4-12
5-1. Introduction
.....5-l
4-113. OverloadStorage
...+13
5-3. RecommendedTestEquipment.
.. ... .. . 5-l
+l15. DCSwitching
Logic.
. . +13
5-5. TestRecord
.....5-l
+117. ReferenceSupplies
...+13
5-7. PerformanceTests.
......5-l
4 - 11 8 . V o l t a gMe e a s u r e m e.n. .t .s . . . . . . . + 1 3
5-9. DCVoltmeterAccuracyTest.. ...5-l
+122. RatioMeasurements
5-l l. AC VoltmeterAccuracyTests.
. . . 5-l
( O p t i o n 0 8 0. )
....+14
5 - 1 5 .O h m m e t e r A c c u r a c y T e s t s . . . . . . - 5 - 2
+118. FrontPanelSwitching
. ... . . .4-15
5-16. PreferredMethod
......5-2
ir-

Model3490A

Table of Contents

rABLEOFCONTENTS
(Cont,d)
Page
Section
SectionV (cont'd)
page
VII.
TROUBLESHOOTING
Method
AND
Ätemate
. . ... .5-2
5-18.
CIRCUITDIAGRAMS
.......7-l
5 - 2 O - D 0 C o m m o n - M o d e R e j e c t i o. .n. T
. . e. 5s-t2
7-1. Introduction
5 - 2 2 .A 9 C o m m o n - M o d e R e j e c t i o n
. .T. .e. .s5t 4
...7-l
7-3. Preliminary
Troubleshooting
Rejection
Test.. ......54
... ... . . .7-l
5-24-AC Normal-Mode
7'5. TroubleshootingTrees ........7-l
5-26.DcVoltmeterlnput
7-7- Access
for Servicing
Test..
Resistance
.. . .7-l
.... .54
7--9. PowerSupplyChecks
5-28.AcVoltmeterlnput
........7-l
ImpedanceTest.
....7-2
.....S-5
7-13.DCAnalogCircuits
7-15- ,{2 Assembly
Exchange
5-30. Sampli/HoldPerformance
. . . . .7-2
7-17- DCAmplifierChecks
(Option04OlO45)
.......7-2
.....5-5
7-22. DC AmplifierSwitchingCircuits. . . . .7-3
5-32. Sample/Hold
DCMeasurement
7-25. ReplacementofQCR3Ol ....7-3
AccuracyTest..
......54
5-34. Sample/Hold
CircuitChecks. .. . .7-3
Response
Test
7-27. A-to-DConversion
... ..5-6
5 - 3 6 .R a t i o P e r f o r m a n c e ( O p t i o n 0.8. .0. .)..5. - 7
7 1 1 . I n t e g r a t o r T r o u b l e s h o.o. .t.i .n. g. . . . 7 4
5-38. DC/DCRatioAccuracyTests
737' OhmsConverterTroubleshootlng.....74
541. AClDCRatioAccuracyTest .....5-g
543- ExternalReferenceinput
!t4z'
1 9 D i s p l a y T r o u b l e s h o o. .t.i.n. .g. . . . . . 7 - s
LogicTroubleshooting
ResistanceTest..
.....5-8
.. . . .
545. GPIBOperational
(Option
.. .7-5
Check
030) .. .5-8
-t4ö,6 _ Suggestions
Data
Output
Troubleshooting
547. General
TestProcedure
. .-. .
. . . 5-l I
(OptionO2l) .
549. TestProcedure
. . . . .7-5
Using
7-50.
Remote
ControlTroubleshooting
Model98204Calcrilator
. . . . . 5-l l
( O p t i o n O 2 2. )
5 - 5 1 .A d j u s t m e n t P r o c e d u r e s . . . . . . . . 5 - 1 4
.....7-5
t-)2' GPIBTroubleshooting
5-53.PowerSupplyAdjustment ......5-14
( O p t i o n 0 3 0. )
5 - 5 5D
. CZeroAdjustments.. .......5-15
.....'l-5
GeneralChecks
5 - 5 7 .R e f e r e n c e A d j u s t m e n t s . . . . . . . . S - 1 5
......7-s
!-)5'
5-59. DC AmplifierAdjustments
E x t e r n a l T r i g g e i C i r c u i t C h. .e. c. .k7.4
561. ACCorrverterAdjustments .....5-15
!'t7'
563. lVRangeAdjüstments ......s-15
1-t?'sample/HoldSJrvicing ........74
544. l0VRangeAdjustments
A c c e s s t o S a m p l e / H o l d C i .r.c. u. .i7t s4
!-bu'
.....5-16
743'
5-65. 100V RangeAäjustments
Operating
the3490Awith
. . . . 5-16
5-66.OhmmeterAdjustments.. ......5-16
Sample/HoldAssembliesRemoved..T6
5-69.Sample/HoldAdjustments. .....5-16
Sample/HoldTroubleshootingTrees...T4
!t2
t4'1. RatioTroubleshooting
5-71. OffsetGainAdjustment
. . .. . . ..7-8
. .. .. .5-16
7495-73. OffsetAdjustment.
ExternalReference
Amplifier
. . .5-17
5-75. Dielectric
Checks.
Absorption
. . . .7A
Adjustment. .. .5-17
5 - 7 7 . R e s p o nA
se
d j u s t m e .n. t. . . .
. . S - i At ^ '
7'73.
5-79. RatioReference
Reference
PolarityLogicChecks. . . . 7-8
Adjustments
. . .5-lg
r.
7-75. SchematicNores.
.....7_g
7'77. LogicGateSymbols
. . . .7-g
Section
page
VI.
REPLACEABLEPARTS
......6-I
SCCtiON
PAgE
6-1. Introduction
...6:l
V l I . B A C K D A T I N .G. . .
... .8_l
6-1 Orderinglnformation ........6_l
g_1. Introduction
.....g_l
6 - 6 . N o n - L i s t e d p a .r t s
g _ 3 . C h a n gSee q u e n c e
.....6-l
........ g_l
6-8. ProprietaryParts.
g-5. partsNotUsted.
.....6-l
........g_l
APPENDICES
A. CodeList of Manufacturers
B. SalesandService
Offices

Model34904

Table of Contents

L I S TO FI L L U S T B A T I O N S
Page
Figure
Figure
Page
2-1. Line Voltage Selection
. . .2-l
4-23. WaveformsIllustrating
. .s
.......2-l
2 - 2 . P o w e r C o r d C o n f i g u r a t i .o. n
Acquire/HoldMode.
......4-22
2-3. Model3490ADimensions
......2-2
4-24. Simplified Diagramand
24. Installation of IsolatedBCD Output
O p e r a t i o n oSf / H C i r c u iAt . . . .
....4-23
. . .. . .. .2-3
a n d R e m o t eO p t i o n s
4-25. SimplifiedDiagramof S/H Circuit B . . . . .. .. .4-24
2 - 5 . D a t aO u t p u t C o n n e c t i o nOsp, t i o n0 2 1 . . . . . . . . 2 4
4-26. Aebctric Absorption Compensation. . . . . . - . . 4-25
2-6. RemoteInput Connections,
Option 022 ... . . . . 2-5
4-27. Sample/Hole
Logic Block Diagram .. . .... . . . 4-25
2-7. RearlnputConnectorandCable .......2-6
4-28. Block Diagramof S/H Timing
2-8. InterfaceBus Cables
. . . .2-6
andTriggerCircuits
.......4-26
2-9. GeneralPurposeInterfaceBus Connections.. . . .2-J
4-29. Sample/HoldTriggerTiming
. . .4-26
2-10. Tigger Connections,GPIB Option 030 . . .. . . . .2-8
4 - 3 0 . S a m p l e / H o l d M e a s u r e mS
ee
nq
t u e n c e. . . . - . . . + 2 8
2-l I . TriggerConnectionsS/H Option 045 . . . - . . . . . . 2-8
4-31. Sample/HoldSimplified Diagramand
3-1. Front and RearPanel
. . . . 3-0
M e a s u r e m eSn et q u e n c e
....+29
3-2. Connectingthe Guard
. . .3-2
5-1. AC Voltmeter High Frequency
3 - 3 . O h m m e t e r l n p u t C o n n e c t i o. n s
........3-5
AccuracyTest..
.....5-2
(Option 020) ... . .. . 3-5
34. ExternalTriggerSequence
5 - 2 . D C C o m m o n - M o dRee j e c t i o n T e s t
.....5-3
5-3. AC Common-ModeRejectionTest
3-5. Option 021 Printout
. . . .3-6
. . . . .54
5 4 . A C N o r m a l - M o dRee j e c t i o n T e s. .t
3-6. RemoteProgramSequence(Option 022) . . . . . .3-7
..... 5-5
5 - 5 . D C V o l t m e t e r l n p u tR e s i s t a n cTee s t . . . . . . . . . . 5 - 5
3-7. Position of JumperWireson Outguard
5 - 6 . A C V o l t m e t e Irn p u tI m p e d a n cTee s t. . . . . . . . . . 5 - 6
Mother Board AssemblvA31
3-8
5-7. Sample/HoldResponse
- . .5-7
Test .
3-8. Timing Diagram,3490A Addressedto Listen . . 3-l I
5-8. External ReferenceInput
3-9. Timing Diagram,3490A Addressedto Talk . . . .3-12
ResistanceTest..
....5-9
3-10. ExampleofMarked CardProgramming. . . . . .. 3-15
5-9. Location of Adjustments,
3-1l. Typical Responseto a Step
....5-14
Standard3490A
InputVoltage....
..3-18
5 - 1 0 . L o c a t i o no f S a m p l e / H o l d A d j u s t m e n.t.s . . . . . 5 - 1 7
3 - 1 2 .D i $ t i z i n g a R a m p
.....3-19
5 - l l . L o c a t i o no f R a t i oA d j u s t m e n t s
.......5-18
3-13. UsingDelayed-Sweep
Oscilloscopein
R a m p L i n e a r i t y M e a s u r e m e n. t. s
..6-30
...3-20
6 - 1 . C h a s s i s P a r t.s
3-14. Filter Output Measurement
. . . .3-2O
...6-31
G 2 . B i n d i n g P o sAts s e m b l y. . . .
3-l 5. Measurementof a Step Input
. . . 3-21
......G31
6-3. SwitchAssembly
3 - 1 6 .R a t i o l n p u t C o n n e c t i o n s .
.....3-21
. .. . .7-3
7 - 1 . S w i t c h i n gI n p u t st o A 2 U 2 .
4 - 1. D u a l - S l o p e I n t e g r a t i o n
...4-1
........1-3
7-2. SwitchingOutputsofAlU4Ol
4-2. BasicDiagramandOperation..... .....1"2
........7-7
.:7-3. Sample/HoldAssembly
4-3. SimplifiedDiagram,DCAmplifier
......4-3
14. deneralTroubleshootingTree ....7-ll17-12
44. Measurement
.. . ... - .44 iL' l-5. DC Ana1osTroubleshootins
Sequence
Tree
.] -1317-14
4-5. Simplified Diagram,IntegratorCircuits . . . . - . . . 4-6
j 4. AC ConveiterTroubleshoolingTree . . . . . i,-1511-16
4-6. Simplified Diagram,AC Converter. . . . . . . . . . . .4-7
7-7. OhmsConverterTroubleshootingTree . . .7-17 17-18
4-1. SimplifiedDiagram,OhmsConverter..........4-8 7-9. DisplayTroubleshootingTree
....|.-1917-20
4-8. Block Diagram,Clock and Counters
j-9. Loeic Test TroubleshootingTree
. . . .4-9
. .7-2117-22
4-9. TypicalStateMachineBlockDiagram ...4-g
7-tO.I_ofibClockTroubleshooti"ngTree.......l-2317-24
4-10. Block Diagram,Main Logic
7-l l. Data Output TroubleshootingTree
ASMFlowChart.
...4-10
..1-2517-26
option}2l ..
4-l l. Block Diagram,Main Logic Circuits
. . . .4-11
Tree,
7-12. RemoteTroubleshooting
4-12. Block Diagram,QualifierMultiplexer
. .4-12
. .i-2717-28
option 022 . .
4-13. Simplified Diagram,Reference
7-13. GPIB I/O TroubleshootingTree,
and Ratio Circuits
. . .4-13
. .7-2917-30
Option 030 . .
4-14. SimplifiedDiagram,External
7-14. Sample/HoldGeneralTroubleshooting
Reference
. . 4-14
Circuits
Tree .
. .1-3117-32
4-15. Input BiasCompensation
.
. . . . .4-15
7-15. Sample/HoldLogic Troubleshooting
4 - 1 6 .R e f e r e n c e P o l a r i t y L o g i c .
.....4-15
.1-3317-34
T r e e. .
4 - 1 7 .P o w e r S u p p l y B l o c k D i a g r .a. m
....7-35
.....4-16
.
7 - 1 6 .R a t i o T r o u b l e s h o o t i n g T r e e
4 1 8 . D a t a O u t p u t T i m i n g D i a g r a m ( O p t i o n 0 2. l.). 4 - 1 8
....7-36
7 - 1 7 .L o c a t i o n o A
f s s e m b l i e. s. .
4-19. RemoteControl Timing Diagram
. .7-37
7-18. 3490A Block Diagram
( O p t i o n0 2 2 ) .
.....7-38
.....4-19
7 - 1 9 .R e f e r e n cDee s i g r a t i o n. .s
4-20. T1'picalBus System
7-20. SchematicDiagram,DC Amplifier
. . . .4-20
.7-391740
4 - 3 1 . S a m p l e i H o lC
d i r c u i rP o s i t i o n
C i r c u i t s ,A l , A 2
a n dS w i t c h i n g
. .4-22
-1-ll. \\'aveformsIllustrating
7-21. SchematicDiagrant,Integratorand
Track'Hold\{ode.
...74117-42
T r , r o D e t e c t C i r c u i t s ., .A. l
..+22
'.;

Model3490A
TableofContents

L I S T0 F t L L U S T R A T | 0(N
CS
ont,d)
Figure
Page
7-22. SchematicDiagram, Referenceand
Ratio Circuits,Al, Al3
7431:144
7-24. SchematicDiagram,Main Logic, Al . . . . .745;1746
7-23. SchematicDiagram, Clock
a n d C o u n t e r s , A l. .
...7_47174g
7-25. SchematicDiagram, DC Switchins
L o g i c , A l. . . . . : .
' -7-26. SchematicDiagram,power Suppli€s,
41, A8

Figure
7-i+. schematic
Diagram,
sample/Hold
A n a l o s C i r c uAi t2s7, ' . . . . . . .
7-35. Schematiö
Diagram,
Sample/Hold
L o g i c C i r c u i t : , 1 2 S . ... . .
7-36. BlockDagram,3490A
GPIB
I/O Circuits.

7-37. schem.li;;i;;;;; ii*,.

p;;;;;''

Page
.7_671j_6g
...7_6917_70

- . . 7-71t i -72

andROMAssy,s,A34,A36 :.
.-.-.. . . .7_7317_74
7-38.
Schematic
Diagram,
Diagram,
GpIBIsolation
o, :. . . . . äl',i_]l
7-?7.
l+e;atic
?ror"r,
A s s e m b l iAe 3s 0
. ,A35
7-28. SchematicDiagram,Function.
-. . ... . .7_7517_76
7-39. Schematic
Diagram,OutguardDu;;
Range,and SampleRateSwitches,AS .7_5517_56
andROMAssemblies,
ACConverter,
A32, A33
e.S--.
. .7_5717-Sg 740.
222. l*" aticDagram,
7_7717_78
Schematic
7-30.
Schematic
Diagram,OutluarJ'
Diagram,
OhmsConveri"r,
--' .7_5917_60
X
7-3I. Schematic
MotherBoard,fil .:
Diagram,
ExternalTrissei'
. .7-7glt_80
8-1
.
Component
Ag,
A2),
A2g,A37:.
j_6117_62
Location,41 1, SerialNo.
- _Circuits,
7-32. khematic Diagram,DataOutput
l2ltA0[55and.Lowr;
.......
... 8_3
8-2.
Option
Schematic
021,
A9,
A10,
Diugru., Al I Assembly.
Al5:
-' '. '. . .7-6317_64
^.
7-33. Schematic
Diagram,
Seriat
Remotetnpui
No. r2lr/r}fiss anJi;;er
...... . . 84
Option022, AII, AI2, Ali . .
.7_651746

TISTOFTABTES
Table
1 - 1 . S p e c i f i c a t i o n. .s. . . .

Page

Table
,^X
t-2. c.n.turrnior*;!;; ... :...
!-5. GainDelayRelationship
5-1.
Recommendear.rt
|
Option050 and
pari
nq'uip.;;;
?
QRtionOAO Ctran;;, . . . . . .2_3
5 - 2 . D C V o l t m e t e r A c c u r a c y : . . . . . . . . . . . . . 5_0
purpose
Interface
:-.'..
Brrä;;;täs
?-? General
.....2_7
5 - 3 . A C V o l t m e t e r A c c u r a c:y: . . . . . . . . . . . . . 5 _ l
................... 5_3
l-1 MaximumVoltages
.....3:2
54. Ohmmeter
l ea t ea n d R e s p o n
Accuracy
i i r .n r . . . : . . . . . . . . . 3 4
1-?. SampR
5-5. AlternateOhmmeter
3-3. DstortionError
AccuracyTest .
. . . 5_3
s6. sample/HoldDCeccuracyäL;":
.....s_6
5
7
.
D C / D C R a t i o A c c u fräar. iv- .
a ln e m o n i c s . . . . . . ' . . . . . . . . 3 _ 7
2 - : c f l n S i g nM
5 - 8 . A C / D C R a t i o A c c u r a " y f . r. i. . . . . . . . . . . . . . 5 _ 7
3-6. AddressCodes . ,
""""3-9
.... 5_8
s - e . p o w e r S u p p l v v o l t ü ; ; .. :...
3-7. Programü;..
: 1 . ' . .: . . . . . . . . . . . . . s _ l s
.-310
5 - 1 0 .O h m m e t e r ' A d j u s t m e n t
3 -8 . Ab t i , t y ; i ö ö r 6l " rä ,o i c,i i rl '
G l . R e p l a c e a b t e p.ä. ..r ..t .s..:.. . . -: .:... . .. .. ... . . . 5 _ 1 6
a Ramp
or
Sine
Wave .
-S/H
.....6_2
-,^..7-1.._.power
3-9. Initiating
SupplyVoltages
Measurements
and
byExternalTriggering
CurrentLimitValues
.
.....3_17
......7_1
3 - 1 0 ._
MaximumAcquisiiön
P
o
w
e r S u p p l y J l T p " r w i.r.e. .s. . .
tin
gj
1Sät
T2
...7_2
7-3. AC ReedRetayChäcks.-.
StepIäput
fiTr for Full_Range
. . . . . . . : : . . . . . . . . .74
. . . .3_tg
3 - 11 . ^Ratio
Polarity Disolav"
c o m p o n eSnpt a c i n g
.. .. .. ..... . ... . .74
"'3-21 7 1 Data
+ 1 . ACAdiG;;üffi'"
Output.irouUierhooti"g
.
np,
T:
+2. P o r a r i r y ; R ; , t " ü ' ä ; ; . ; ; ; ,
74.
Alphabetical
.
.
.
.
.
.
.
.
"f
.
.
.
.
.
34tö;
ü;rmonir, . . .7_to
f
r
z
+3. Analog Tests .
J,istins
7-7. Atphabetical
Listini;itrö;ä;ö'
"'4-16
4.
ecquiie/HoioD;i;;...
I/OMnem.oni.,
.....-.'_ ....7_7117_72
4-22
8 - 1 . M a n u a l B a c k d a. .t.i n l i h * ; ; ;
.........
....8-l
_

1 1 o h i l " a ; ; a ; ; ; ;:i:

:

:.il

vll

Model34904

SectionI

sEcTt0N
I
GENERATINFORMATION
1 . 1 l.N T B o D u c T l 0 N .
l-2. The Model 3490A Multimeter makesac voltage,dc
voltage, and resistancemeasurementswith 5-digit resolution. It is capable of overrange measurementsup to
l2O% of range on all except the 1000V ac and dc
ranges. Polarity selection and display are automatic.
Range selection is manual or automatic over all ranges
on all functions. Options are available to provide data
output, remote programming, sample-and-holdmeasurements,and ratio measurements.
1-3. This manual contains installation and operating
instructions as well as maintenanceinformation for the
Model 34904 Multimeter. Instrument specificationsand
procedures for verifying proper operation are included.
Proceduresare also included for adjusting the instrument
to its performarice specifications. Schematic diagrams,
the theory of operation, and troubleshooting information are provided for use in maintaining the instrument.
14. This section of the manual contains the performance specificationsfor the Model 3490A and lists the
available options. It also lists the accessoriessupplied
with the Model 3490A and additional accessoriesthat
are available.Instrumentand manual identification information is also included.

1-5.SPECTFtCATI0NS.
l-6. Table l-l is a complete list of the Model 3490A
critical specifications that are controlled by tolerances.
Table l-2 contains generalinformation that describesthe
operating characteristicsof the Model 3490A.
l-7. Any change in the specifications due to manufacturing, design, or traceability to the U.S. National
Bureau of Standards will be listed on a manual change
sheetincluded with this manual. The manual and manual
changesheetsupersedeall previousinformation concerning specificationsof rhe 3490A.

Option040 or 045: Sample-and-Hold
Option050: 34904 designed
for operationon 50 Hz
powersource
Option060: 3490A desigred
for operationon 60 Hz
powersource
Option080: Ratio
I - I l l . A C C E S S O R ISEUSP P L I E D .
l-ll. The following accessories
are suppliedwith the
Model3490Aandits option asshown.
Supplied
with all instruments:
Rack Mount Kit
PC Extender(2 x l8)

03490-84401
5060-s983

Suppliedwith Option 020:
Rear input cable
o349Mt612
36-pin connector
(mateswith Remote connector,J7)
l2sl{084
5Gpin connector
(mateswith Data Output connector,J6) I 2s I -0086
RemoteJumper Assembly,A.4
03490-66504
P C E x t e n d e (r 2 x 2 2 )
5060{630
Suppliedwith Option 030:
l4-pin connector

(mateswith Triggerconnector,
Jl l)
RemoteJumperAssembly,44
Rearinput cable
PCExtender(2 x 22)
Supplied
with Option040:
S/H AnalogJumperAssembly,A24
.-' S/H LogicJumperAssembly,A25
PCExtender(2 x l0)
Supplied
with Option045:
S/HAnalogJumperAssembly,
A24
S/HLogicJumperAssembly,
A25
PCExtender(2 x l0)
l4-pinconnector
(mateswith Triggerconnector,Jl l)

12514142
0349U66504
0349041612
5060{630
0349046524
03490-66525
50606032
0349U66524
0349046525
50606032
12514142

r-8.0PT|0NS.
l-9. The following options are availableto extend the
usefulnessof the Model 3490A:

Option020: BCD/RemoteExpand
Option021: IsolatedData Output (BCD)
Option022: IsolatedRemoteControl
(Options021 and 022 require
Option 020)
Option030: GeneralPurposeInterfaceBus I/O

(GPrB)

Supplied
with Option080:
RatioJumperAssembly,
A26
PCExtender
(2 x l0)

0349046526
5060-6032

1 . 1 2A
. C C E S S O RAIV
EA
SI T A B L E .
l-13. Severalaccessories
are availablefor use with the
Model 3490A. A servicevideo tape,Product No. 90030C
Option 705, will demonstrateuse of self-testand front
panel symptoms to isolate failures. The -hp 111261^
accessoryprovides a set of IC referenceboards with

1-t

SectionI

Model 3490A

most of the 3490A logic IC's for use with the -hp
lO529A Logic Comparator.Using theseboardswith the
Logic Comparator,a faulty IC can be isolatedin seconds
without removingit from the circuit. A spareparts set,
-hp- 11127A, is available for the 3490A. This set
contains the most critical components of the 3490A
such as integrated circuits, transistorsand reed relays.
Three interface cables are available for the GPIB Option
030. Thesecablesareidentical except for length.
l063lA Interfacecable,3ft.
10631BInterfacecable,6 ft.
10631CInterface cable,12 ft.
A GPIB Repair Kit, -hp- Part No. 0349G80009, is
available for troubleshooting the General Purpose lnterface Bus I/O circuits. Also availableis a cable.Product
No. 562A-16C, for use with Option 021 and *rp 50508
or 50554,Printers.Field installableOptions O2l and,O22
for units with Option O2O are available by accessory
numbers Ill2lA and I I l22A respectively.

l

-

1 . 1 4 I. N S T B U M E NATN D M A N U A LI D E N T I F I C A TION.
l-1 5. Instrument identification by serial number is
located on the rear panel. Hewlett-Packarduses a
two-section serial number consisting of a four-digit
prefix and a five-digit suffix separated by a letter
designating the country in which the instrument was
manufactured. (A = U.S.A.; G = West Germany;
J = Japan;U = United Kingdom.)
l-16. This manual appliesto instrumentswith the serial
numbers indicated on the title page. If changeshave
been made in the instrument since this manual was
printed, a "Manual Changes"supplementsupplied with
the manual will define thesechanges.Be sure to record
thesechangesin your manual. Backdatinginformation in
Section VIII adapts the manual to instruments with
serial numbers lower than that shown on the title page.
Part numbers for the manual and the microfiche copy of
the manual are also shown on the title page.

Model3490A

SectionI

Table 1-1. Specifications.
DCVOLTAGE
Display: .
Full-Rangp

:1P9P.Y

r 10O.oOo
v

v
i I;IBBBB
V . rooo.öö

Overrange:2O % onall rangesexcept 1000 V range
Aeuracy: t l% of reading+ Toof rangel
.1 V Range
24 hours
{23oc ! loc)
30 days
(23oc1soc)
90 days
(23oc r5()c,
6 months
{23ocisocf
1 year
{23oc!soc)

Temperature Coefficient l0o C to
reading+ 0.001 % of range)F C

Voltage Coefficient (1000V range):
Add 0.01 ppm per Volt/
kHz to % of reading
Input lmpedance:
2 Mf, t 1 %shuntedby:
( 65 pF without rear input terminal
< 90 pF with rearinput terminal

1V-f00{,VRangas

t (0.005+ 0.001)

(0.004+ O.OOI
)

I (0.01 + 0.005)

(0.008+ 0.0021

! (0.01 + 0.005)

(0.01 + 0.0021

r (0.013
+ 0.0051

(0.013+ 0.oo2l

t (o.015+ 0.0051

(o.015+ 0.oo2l

50PCl: r (0.002 % of

OHMS
Full-RangsDisplay:
.100000ke
l.oo000 ko
10.0000ka
100.000ko
1000.00ko
10000,0ko

TemperaturoCoefficient (0o C to 50o Cl:
O.1 V Range: t (0.00,l% of reading + 0.0007
% of
range)/oC
'
Overrange: 2O % on
ranges
1 V t h r o u g h 1 O O O V R a n g e s :r ( O . O O 1
-all
% of reading
+ 0.OO03% of rangelp C
Accuracy: + (% of reading+ oÄof rangel
Voltage Coefficient { I 000 V range): Add 0.04 ppm/vott
to % of
reading.
Effectlve Common{lode Rejoction (with 1 kf,l
imbalance in
24 hours
0.006+ 0.001
0.005 + 0.001
0.007+ 0.001
either loadf:
(23oc 1 loc)
0.025+ 0.ool
30 days
0.O12+ o.OOs
AC:
O.01 + 0.002
o.0t2+ 0.002
(23oc!socl
0.035+ 0.002
Option O5O (SOHz power frequency):)
0.012+ o.oo5
140 dB at 9O days
0.012+ 0.002
0.0'l5+ 0.002
0.035+ 0.002
l23oc!50c)
5 0 H 2 t 0 . 1%
6 months
o.ot5 + 0.005
0.0t5 + 0.002
Option 060 (@ Hz power frequency):)
0.02 + 0.002
0.04 + 0.o02
{23oc t socl
140d8 at
I year
6 O H z t 0 . 1%
0.018+ O.OO5
0,018+ 0.002
0.025+ 0.002
o.05 + 0.002
DC: ) 140dB
AC Normal{VlodeRejection:
TemperatureCoefficient (0o C to 50o C):
Option 05O (5O Hz power frequencyf:>S0dB
at 50 Hz
!O.l%
0.1 ko range: ! (O.OOI% of reading
+O.OO07% of
Option 060 (60 Hz power frequency): > 50
range)PC
dB at 60 Hz
to.1 %
1 kO through t0,0OOkf,l ranges (< 70% R.H.
on 1OOOkj_l
Input Resistance:
and 10,0O-0
kf,! ranges):r (O.OO1%
ot reaaint i O.OOOSX
O.1,Vthrough10 V ranges(< 70%R.H.): >
of
range)/"C
-2 x 1010O
100 V and lü)0 V ranges:10 MO I O.1S%
DATA OUTPUT(OptaonOZtl
AC VOLTAGE
BCD 1-2-4€, High true or Low true logic
code, selectableby
Full-RangeDisplay: I.OOOOO
internal sl,rritch
V
10.0000v
100.000v
1000.00v
High Level
Low Leval
Overrange:2O%on all rangesexcept IOOO
V range
I nput
+ 3 . 9 V r 1 . 5 V , +0.3v t0.3V,
ttTlgnt
Rango: 20 Hz to 250 kHz (Guardshorted
to Low),
Signals 100pAmax.
10' nnximum Volt-Hertzproduct
2 mA rnax.
Output + 3 . 9V r 1 . 5V , + 0 . 3 v r 0 . 3 v ,
Accuracy: x l%ot readingt % of range)
Signals 4O0pA rnax.
15 mA max,
lnput levelsabove1 % of range
Guard must be connectedto Low
REMOTECONTROL (Option 0221
20 Hz
50 Hz
100 kHz* 2SOkHz
Remote programmingof rangeand function
24 hours
0 . 3 2 + 0 . 0 5 l O . o o + 0 . 0 2 5| 0 . 7 + 0 . 0 6
uses|rigrhtrue rogic
code.
(230C r 10 cl
3) days
0 . 3 5 + 0 . 0 5l o . r + 0 . 0 2 5| o . z s * o . o e
(230Cr50c)
90 days
High Level
0 . 3 5 + o . olso . t + o . o 2 sl o . z s * o . o o
Low Level
(230C150C)
I nput
+3.9Vt15V,
6 months
+0.3v!0.3v.
0.4 +0.06 | o.r +0.03 | o.zs*o.oz
(23()C15()Cl
Signals 100pA max. or
2 mA rnax.,or
l ye€r
open circuit
0.45+0.07 o.tz+o.o3s 0.7s+o.o8
contact closure
|
|
(230c+5()Cl
to ground
through< 300 o
I Frequencies
greater than lO0 kHz specified
Output + 3 . 9 V r 1 . 5 V , + o . 3 V r 0 . 3 V ,
on 1 V and
l 0 V r a n g e so n l y .
Signals 40OpA nrax.
15 mA nnx.

l-3

Model34904

SectionI
(Cont'd).
Table1-1. Specifications
RATIO (Option 0801

/
External Reference Ranges:
1 V : 1 O . 1V t o t 1 . 2 V
10V: tlVto112V
{1 V range should be used for greater accuracy if the Ext- Ref'
voltage is between 1 V and 1.2 V.

Ratio Measurement Input Configuration:
3 wire; External Reference Low is conlmon with Input Low.
External Reference High may be positive or negative with
respect to Low.
I nput

Ratio =

Ext. Ref.

Input Ranges:
DC: o.1 V to 1000 V
AC: 1 V to 1000 V

External Reference lnput Resistance: > 107O

DC/DC Measurement Accuracy:

Ext. Ref. Range

! (Ao/oof Reading r Bo/oof lnput Range +

-

xC%of Input Range)
Ext. Ref . Voltage
lnput Range

A

B

100v, 1000v

1 V ,1 0 V

1 V
Ext. Ref.
Range

c

A

B

c

A

B

c

24 hours(23"C I 1"c)

tov
1 V

.003 .001 .oo2
.o03 .002 .002

.002 .001 .oo2
.002 .002 .002

.003 .001 .002
.005 .003 .002

3o days (23"c r 5"c)

10v
1 V

.oo7 .005 .0m
.008.015.003

.002 .003 .002
.o03 .012 .003

.005 .003 .002
.006 .o12 .003

9o days (23"c t s"cl

10v
1 V

.o07 .oo5 .002
.008 .015 .003

.002 .003 .002
.o03 .012 .OO3

.006 .o03 .002
_007 .012 .003

6 months(23oc r s"cl

10v
1 V

.007 .005 .002
.008 .015 .003

.002 .003 .oo2
.003 .012 .003

.007 .003 .002
.008 .012 .OO3

1 year 123oc t 5"c)

10v
1 V

.o07 .005 .002
.008 .o15 .o04

.003 .o03 .002
.004 .012 .004

.008 .003 .o02
.o09.012.OO4

Notes:
1. On the lOOO V range, add 0.04 PPM/volt to the % of reading specification'
2. EMF's generated external to the 34904 {lay b9 cgmpensated to achieve the % of range
accuracy specified by utilizing the rear panel ThermafAdjust provided'

DC/DC Temperature Coeff icient:
! lo/oof Reading + % of Input Range)/-C
lnput Range
Ext. Ref.
Range

1 V

1 V ,1 0 V

'10v
1 V

r {0.0003+ 0.0007}
r (0.0004+ 0.0021

r (0.0001+ 0.00041
r (0.0002+ 0.0021

DC/DC Measurement Accuracy Example:
l n p u t V o l t a g e = 0 . 5 V ; I n p u t R a n g e= 1 V
E x t . R e f . V o l t a g e = 0 . 5 V ; E x t . R e f . R a n g e= 1 V
30 day spec. = t (0.0037o of Reading + O.O12%of lnput Range
Ext. Ref. Range
x 0.003% of Input Rangel
Ext. Ref. Voltage
R a t i o R e a d i n gs h o u l d b e 1 . 0 0 0 0 0
= 3 counts
0.003% of Reading
: 12 counts
O . O 1 2 %o f I n p u t R a n g e
x o.oos"Ä of Input Range= 6 counts
*
.5V
= 21 counts
Total rror tolerance
Displayshould be 0.99979 to 1.00021

t t
t-

100v, 1000v

= (0.0005+ 0.0004)
t

(0.0006+ 0.002)

AC/DC Measurement Accuracy :
10 V Ext. Ref. Range: Same as AC Voltage aocuracy
1 V Ext. Ref. Range: ^
24 hours 123-C t 1-C)l Same^asAC Voltage accuracv
30 davs to 1 year Q3-C x 5-C): Add o.01 to % of Rang
AC Voltage accuracy
{ S e eT a b l e 1 - 1 o f m a i n 3 4 9 0 4 m a n u a l . l

AC/DC Temperature Coeff icient:
10V Ext. Ref. Range: Same as AC Voltage temperature
coefficient
o/ool Range in AC Voltage
1 V Ext. Ref. Range: Add 0.001 to
ication
temperature coeff icient specif
( S e eT a b l e 1 - 1 o f m a i n 3 4 9 0 A m a n u a l . )

Model34904

SectionI
Table1-1. Specifications
(Cont,d.)

SAMPLE/HOLD(OPtion040/0451
Full-rangeDisplay:

r 1.00fi)v
+ 10.q)0v
! 100.00V
r 1000.0v

Sample/Hold MeasurementAccuracy (DC function, I V through
1ü)0 V ranges!:

Sample/Hold measurement displar/ is 4 full
digits plus overrange "1 ",

Ovrrangs: 2O%on all range5exceptIOOOV range.

24 hours(23oc r 10 c)
30.days(23oc r so c)
90 days(23oc r so c)
6 months(239C r SoC)
1 year 1230c r so cl

t (% of reading + oÄoI rcngel

Temperature Coefficient
(04 C to
reading + 0.0O1 % of range/o C).

r
r
r
r
I

{ 0 . 0 1+ 0 . 0 1 5 1
(0.01+ 0.015)
(O.01
+ 0.015)
(0.02+ 0.0151
(o.02+ 0.015)

50oC)r t !O.OO2
% ol

Table1-2. GeneralInformation.
Maximum Input Voltages:

GENERALPURPOSE
INTERFACEBUS LOGICLEVELS

Between Input High and Low: t 10O0 Vrms (1 1500 V peak)
Between either Low terminal and Guard: I 200 V
Between Guard and Chassis:. 4 500 V
Between O Signal High and Low: t 250 Vrms
Range Seleaion:

Manual, autornatic, or Remote (Optionall

Maximum Reading Rate (Minimum Sample periodr per Readingl:
Function

Option 050

Option 060

DC Volts
AC Volts
Ohms
. 1k t o
1 0 0k
1,000k
10.oo0k

240.2ms+5ms
1.26s+ .025s

2 0 0 . 1m s + 4 m s
1.05s+ .025s

24O.2ms+5ms
3O0.2ms+6ms
66O.3ms + 12 ms

20O.1
ms+4ms
2 5 0 . 1m s + 5 m s
55O.2ms * 10 ms

'Sample Rate
Control set to FAST position and instrument
not in owrload.

Response Time (to within rated accuracy for a step input
applied
coincident with encode triggerl:
DC Volts: ( 200 ms
ACVolts: 

Figure3-7. Positionof JumperWireson Outguard
MotherBoardAssemblyA31.
3-105. Addressedto Listen. When the 3490A is first
turned on, the GPIB programmingcircuits will conform
to the front panel control settings.It must be placedin
remote control before programming.
3-106. Remote Control. To place the 3490A in remote
control, set MRE and REN to LOW and transmit the
3490A listen code. REN must be held LOW continuously to maintain remote control. When the instrument
is first set to remote control, the GPIB circuits store the
front panel rangeand function selections.Sample/Hold
mode is Off (S0), Triggeris set to Internal SampleRate
(TQ), and Mode of Operationis AddressedMultiple with
No Output (M0). AnV chalgesin this programmingmust
then be made by remote control. LMRE must be set
HIGH and the remote programmingdata transmitted.
The 3490A will accept only the alpha identifiers E, F,
M, R, S and T, and digits 0 through 7. Table 3-7 lists the
3490A program codes.The 3490A may be unaddressed
to listen by sending the character ?. Figure 3-8 is a
timing diagram for data and handshakelines when the
3490A is addressed
to listen.
3-107. Return to Local Control. The 3490A may be
returned to local control by setting REN HIGH. How-

SectionIII

Model3490A
Table3-6. AddressCodes.
ASCIICODECHARACTER
Listen
Address

Talk
Address

SP

(g'

:,

A
I

#
$
7o

1
(
l

I
0
1
2
3
4
5
6
7
8
I

;

B I N A R YC O D E
Jumper -+ A5
b7
b5
b5

See
note
below

D
E
F
G
H
I
J
K
L
M
N

o
P

o
R
S
T
U
W
X

z
t
I

Note:

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1

A4
b4
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1

OCTAL CODE

A3
b3

A2
b2

0
0

0
0

0
0
1
1
1
1
0
0

'
1
1
0
0
1
1
0

0
0
0
1
1
1
1
0

0

'
1
1
0
0
1
1
0

0
0
0
t
1
1
1
0
0
0
0
1
1
1

A1
b1

'
1
1
0
0
1
1
0
0
1
1
0
1
1

0
l
0
1
0
1
0
1
0
l
0
1
0
1
0
1
0
l
0
1
0
1
0
1
0
1
0
1
0
1
0

Listen

Talk

040
M1
o42
043
o44
045
046

100
101
102
103
104
105
106

u7

'to7

050
o51
o52
o53
054
055
056
057
060
061
62
063
064
065
066
067
o70
o71
o72
073
o74
o75
076

110
111
't12
113
114
115
116
117
120
121
122
123
124
125
126
'127
130
131
132
133
134
135
136

Only first five bits of binary code are given, and these bits are the same for both listen and talk addresses.Sixth
and seventh bits determine whether address is listen (011 or talk (1O).

ever, it cannot be returned to local during output of a
reading. If REN goes HIGH then LOW again while a r''
reading output is in progress,the 3490A will stay in
remote. In order to return to local, then, REN must be
HIGH when no readingoutput is in progress.The 3490A
may also be returned to local by turning its power off
and back on again.If the 3490A is returned to local by
settingREN HIGH, but is not unaddressed
to talk, it will
continue to output readings.If there is a listenersuch as
a 9800 seriescalculator on the bus that is addressedto
listen but is not able to receivedata, the 3490Awill stop
sampling, since it cannot output data. This condition
may appear to be a failure, since the 3490A would
typically be expected to continue sampling and no
longer be under programcontrol.
3-108. RemoteProgramSequence.The orderofremote
programmingis not important except that it must end
with the E command to execute the program. The
191-ul programming sequenceis one alpha identifier
followed by one digrt. For example, the progam
F2R4S1T2MlE selectsAC volts, l0V range,Sample/

Hold off, Next External Trigger, AddressedMulti with
'j Output (seeTable 3-7).lf it is necessaryto changeonly
might be R3E. In other words, programdata will remain
stored as long as the instrument is in remote control,
unless changed by a subsequentprogramming data. if
more than one alpha identifier or digit is sent, the last
valid identifier or digit will be stored. For example,
FRl5T20SMF3E will be accepted as R5T@F3E.Paragraph 3-l3l givesa programmingexampleusingthe -hp9820A Calculator as the controller and printer. The
power line switch cannot be programmed.
$109. Trigger Source Program. The following paragraphs explain the trigger source codes shown in Table
3_7.
3-110. T0, Internal SampleRate. The 3490A releases
the Hold line when ready for a new measurementto be
taken, and the instrument is triggeredaccordingto the
internal sample rate. If the front panel Sample Rate
control is set to the Hold position, it will not sample

3-9

SectionIII

Model34904
Table 3-7. ProgramCodes.

CHARACTER

USE

OCTAL
CODE

b1

BINARY CODE
b6

b5

ba

R
1
2
3
4
5
6
7

RangeProgramldentifier
10,00Okf); Test 7
1,000 kQ; l OOOV; Test 6
100 kO; 1OOV; Test5
10 kQ; 10 V; Test 4
1 kS2;1 V; Test 3
.1 kO; .t V; Test 2
Autorange;Test 1

122
061
062
063
og
065
066
067

1
0
0
0
0
0
0
0

F

Function Programldentifier
DC Volts
K Ohms
AC Volts
Test

106
060
061
62
063

0
0
0
0

Sample/Hold Program ldentifier
Sample/Hold Off
Sample/Hold Off
Track/Hold
Acquire/Hold

123
060
061
62
063

1
0
0
0
0

Trigger Source Program ldentifier
Internal Samole Rate *
lmmediate Internal
Next External Trigger
None

124
060
061
062
063

1
0
0
0
o

115
o60
061
062
063
0il
065
.i066
067

0
0
0
0
0
0
0
o

0
1
1
1
1
1
1
1
1

0
1
1
1
1
1
1
1
1

0
0

105

1

0

0

0

0
a

2
3

s
0
1
2
3
T

o
1
2
3
M

I
2
3
4
5
6
7

Mode of Operation Program ldentifier
Addressed Multi with No Output
Addressed Multi with Output
Addressed Single with No Output
Addresed Single with Output
lnterrupt Multi with No Output
Interrupt Multi with Output
.'-'
Interrupt Single with No Output
Interrupt Singlewith Output

E

Execute Mode of Operation Program

0

0
1
1
1
1
1
1
1

1

I

1
1

0
0

0
1
1
1
1

o
1

,|
1
I

0
1
l
1
1

0
0
0
0
0
0
0
0
0
0
0

1
1
1
1
1

1
1
t
1
1

0
0

1
1
1
1
1
1

0
o
0
0
0
0
0
o
0
0
1

0
o
0
0

o
0

b2

b3

b1

1
0

0
0
1
1
1
1

1
1
0
0
1
1

1
0
0

0
0

o
0

1
1

0
0
0
0
0
1
0
0
0
0
1
0
0

o
0
1
1
1
1

0
l
0
1
0
1
0
1

'

1

0
0
1
0
1

I

0
1
a

0
0
0
1
1
0
0
0
I
1
0
0
I

0
1
0
1
0
0
1
0
1
I

o
1
0
1
0
a

o

1

I

0

I

* lf Internal
Sample Rate is programmed, make sure front panel Sample Rate control is set to desired position.

until the manual pushbutton is pushed, an external
trigger occurs,or the front panel control is taken out of
hold.
3 - 11 1 . T 1 , l m m e d i a t eI n t e r n a l .T h e 3 4 9 0 A n e v e r r e leasesthe Hold line, but insteadprovides an External
Encodecommandwhen ready for a new measurementto
begin. It is, therefore,samplingat its madmum rate, and
the front panel SampleRate control is bypassed.
3-112. T2, Next ExternalTrigger.The 3490A keepsthe
Hold line LOW and releasesthe Sample/HoldInhibit line
when ready to accept the next trigger.Whenan external
tngger occurs,the GPIB I/O issuesthe External Encode
command. Pushing the front panel manual trigger
pushbutton will alsoinitiate a reading.
3 - 1 1 3 . T 3 , N o n e . T h e 3 4 9 0 A k e e p st h e H o l d l i n e L O W
and checksfor an output request.This method may be
usedto store data for output at a later time.
_i-l0

3-114. Mode of Operation. The following paragraphs
explainthe mode of operationcodesshownin Table 3-7.
d u l t i p l ew i t h N o O u t p u t . I n t h i s
3 - 1 1 5 . M 0 , A d d r e s s eM
mode, operation is similar to operation when in local
control and not addressedto talk. Readingsare taken
according to the programmed trigger, but no output
occurs.
3 - 1 1 6 .M 1 , A d d r e s s e dM u l t i p l e w i t h O u t p ü t . T h e i n strument will take a readingwhen triggeredand output
the readingif addressedto talk. Ifnot addressed
to talk,
it will wait for its talk addressto output data or its listen
addressto be programmed.After output of the data or
receipt of new programmingdata, the GPIB I/O returns
to the beginningof the programto determinethe trigger
for the next reading.
3-117. M2, AddressedSingle with No Output. The
instrument takes one reading when triggeredand does

SectionIII

Model3490A

MRE

Data Lines

Programdata
from controller

LDAV
lndicates to 34904
that data is available

HRFD
349OA will
accept data

349OA is busy and
will not acceptdata

349OA hasaccepted
and is processing
data

34904 will
aocept new
data

3490A
busy

3490A finished
processing data

Figure3-8. Timing Diagram,3490A Addressedto Listen.
not output the reading. A new reading is initiated by
reprogramming the 34904 or by going to local control.
3-118. M3, AddressedSinglewith Output. The instrument takes one readingwhen triggered and outputs the
reading if addressedto talk. If not addressedto talk, it
waits for its talk addres to output or its listen addres to
be reprogrammed. After output of the reading data, a
new readingis initiated by reprogrammingthe 34904 or
by going to local control. If reprogramming occurs
before output of the reading daIa, a new reading will be
taken according to the new programming data.
3-119. M4, lnterrupt Multiple with No Output. Programming of No Output overrides that of Interrupt, so
this mode is the sameas M0.
3-120. M5. Interrupt Multiple with Output. This mode
is the same as Ml except that if the 3490A is not
addressedto talk, it will pull the ServiceRequest(SRQ)
line LOW after each reading is taken. This line is taken
HIGH when the reading is outputted or when new
progamming data is received.SeeParagraph3-l 16.
3-121. M6, Interrupt Singlewith No Output. Programming of No Output overrides that of Interrupt, so this
mode is the sameasM2_
3-122. MT,lnterrupt Singlewith Output. This mode is
the same as M3 except that if the 3490A is not
add;essedto talk, it will pull the ServiceRequest (SRQ)
line LOW after each readingis taken. This line is taken
HIGH after output of the reading data or when new
programmingdata is received.SeeParagraph3-l 18.

3-123. Repeatingan Output. The 3490A can be made
to output the samereadingmore than once. This can be
accomplishedby programmingthe 3490A with "M3E"
and outputting the reading.Then reprogramthe 3490A
with "T3E". The 3490A can output the samereadingas
many times as desired.Programmingwith "TlE" initiatesa new reading.
3-124. Addressed to Talk. The 3490A may be addressedto talk by setting MRE LOW and transmitting
the 34904 talk address.It may be unaddressedto talk
.-by addressingany other unit to talk, or by sendingthe
character- . Figure 3-9 is a timing diagramfor data and
handshak'elines when a printer is addressedto listen and
the 3490A is addressed
to talk.
3-125. Output Control. Two generalmodes of output
are possible, depending on the remote programming of
the 3490A. If normal output (AddressedMultiple or
AddressedSingle,Table 3-7) is programmed,the 3490A
will inhibit triggers after eachreadingand output data if
alreadyaddressedto talk. Ifnot addressed
to talk, it will
wait for its talk addressbefore outputting data, or for its
listen addressto be reprogrammed.If Interrupt output is
programmedand the 34904 is not addressedto talk, it
will issue a Service Request after each reading and await
recogrition by the controller. If it is addressed
to talk, it
will inhibit triggers after each reading and proceed to
output data.
3-126. Output Format. After the 3490A has been
properly put into an ontput mode, the data will be
3-l I

SectionIII

Model3490A

MRE

Data Lines

LDAV

HRFD
Printerand 3490A
will acceptdata

390A and printer
will not accept data

Printer and 34904
processingdata

349OAand
printerwill
acceptdata
34904 and printer
finished
processingdata

3490A and printer
will not accept data

34904 and printer
processing data

Printer will not
accept data

Printerand 34904
finished
processingdata

Figure3-9. Timing Diagram,3490AAddressed
to Talk.

outputted in the following format: (Example listing:
NDCfXXXXXXE-Y).
StatusCode Alpha*
N
OL
R
S
RS

Normal Operation
Overload
Ratio Mode
Sample/HoldMode
Ratio and Sample/HoldMode

Function Code*
AC
DC
KO
T

AC Volts
DC Volts
Kilohms
Test

*Status and Function are two-character codes. lf
only one
character is required, a blank space will be left so that the total
output format will always be the same length.

Polarity
+
-

Positive Input or Positive Ratio
NegativeInput or NegativeRatio

Data

xX)c()ü
E
Y
CR
LF
J-t -

Six digits, most significant digit first
Exponent Identifier
Polarity of Exponent
Exponent (RangeDigit)
CarriageReturn
Line Feed

3-127. Service Request. The 3490A is capable of requesting service on the bus and responding to serial
polling for identification and status. If either mode of
operation which specifiesinterrupt with output (M5 or
M7) is programmedand 34904 is not programmed to
talk, it will pull the ServiceRequest (LSRQ) line LOW
after each reading.
3-128. For serial polling, the controller must pull the
Multiple ResponseEnable (MRE) line LOW and send
both the Status Poll Enable (SPE) command and the
3490A talk address.The SPE command is octal code
030, binary code 00 011 000. If the 3490A has pulled
SRQ LOW, when it receivesSPE and its talk addressit
will transmit the ASCII characterxlxxxxxx. The seventh bit beinga "l " signifiesthat the 3490A did request
service.The other bits do not convey any information
concerningthe status. After it receivesthe Status Poll
Dsable (SPD)command(octal code 031, binary code 00
0ll 001), the 3490A will output the readingdata,since
it is still addressedto talk. After outputting the data,it
will return the Service Request line to HIGH. If it is
unaddressedto talk before the SPD command is sent,it
will keep the SRQ line LOW and wait for its talk addres
to output or its listen addressto be reprogrammed.It
will set SRQ HIGH if it is reprogrammed.
3-129. lf the 34904 is in operatingmode M5 or M7 and
receivesthe SPE command and its talk addressbefore a
reading is completed,it will respondwith the character
"0" indicates that it
x0xxxxxx. The seventh bit being a
did not request service, and the other bits have no
significanceconceming status. This code (seventh bit
"0") is
also transmitted if the 3490A is in any of the
other modesof operation(M0, Ut, M2,M3, M4, or M6)
and it receivesthe SPEcommandand its talk address.

Model3490A

SectionIII

3-130. If the 3490A has requested service and is
addressedto talk but not sent the SPEcommand, it will
not transmit a status code but will output the reading
data if programmedfor output (Ml, M3, M5, or M7).

ExamPle.
3-131.GPIB0perating
3-132. The following example uses a Hewlett-Packard
Model 9820A as both controller and printer. The 98204
must be equippedwith the lll44a Interface,and must
have the Peripheral Control II ROM Block installed in
the proper ROM block slot. An Interface Cable, -hplO63lAlBlC, is needed to connect the 3490A to the
9820A.
3-133. This program places the 3940A in remote control and programsthe following:
Function
Range
Trigger
Mode

DC Volts
l0 V
Immediate Internal
AddressedSinglewith Output

In the M3 Mode and Tl Trigger Source the 3490A
provides an internal trigger to take one reading, and then
it outputs this data. It is then instructed by the
following program steps to take another reading, and
this proces is repeated until the stop button is pressed.
If you do not wish to store this program in the
calculator, substitute the EXECUTE key in place of
STORE in the following sequence:

@o@@üo

ooü

0

(

f-R-\

r

@üoü@

f-E\

STORE

6 = 3490A listen address;
U = 9820A talk address.
This sequenceprograms 3490A t o D C , 1 0 V r a n g e ,
Immediate Internal trigger, and AddressedSignal with
Output.

@o@@
üo
r-'\

O13@Orrui
r;l

@o@o

IFIXEDNI[1J

EXECUTE

OrPR'Nrr@[

Initializescalculator.

@o@o@o
@o@o

STORE

'5 =
9820A listen address;
V = 349OAtalk address.
Programs the 34904 to output data and programs
9820A to print.

SetsLREN LOWon bus.

r?. rfi
\coMMANO/ \

sy
I

I

\--l

[ " ] {

LJ\-

o@@üo

l e r s l

STORE

Addresses3490A to listen. 3490A should so to remote
control. REM annunciatorshould be ON.

r

l

oaoo@
STORE

Programs3490A to take another readingand return to
seqeunce2 to output new data.

3-13

SectionIII

Model 3490A
3-135. Suppressionof CR and LF. When outputting
programminginstructions from the 9800 seriescalculators without using the CMD statement, the Carriage
Return (CR) and Line Feed (LF) normally output by
the calculator must be suppressed.
If not, they are seen
as two programmingcharactersby the 3490A. CR and
LF may be suppressed
in the 9820 by transmitting,Z at
the end of the instructions. In the 9830, they may be
suppressed
by sendinga semicolon.

STORE

Endscalculatorprogram.
To run this program,press

9820 example:
CMD "?U6";FMT "M3R7FQE",Z;WRT13

To halt program,press

9830 example:

1 0 CMD"?U6''
20 OUTPUT(13,30) ..M3R7F@E";

I s r o Pl

L-J

3Q FORMATB

To list program(print out stored program),press

3-136.Controlby
Marked
CardProgrammer.
3-137. The 34gOA with Option 030 maj, be programmedby using a Marked Card Programmersuch as
the -hp- Model 3260A or Model 9860A. An exampleof
marked card programmingis shown in Figure 3-10. The
binary code shown in Table 3-7 is used in marking the
card. Use a soft black pencil to mark each space
representinga "l" in the code. The "200" spacemust be
marked whenever the 3490A is addressedto listen or
clear (unaddressed).The "200" bit pulls the MRE line
LOW, and shouldbe usedonly for addressing.

I E N Dl l L t s r
\
/

3-134. Special Trigger ProgrammingTechnique. When
programming the 3490A, the E indicates the end of
programming information and allows the 3490A to start
operating according to the new programming instructions. The instructions are stored as they are received
and do not require the E in order to be accepted.
Becauseof this, one programming technique is to omit
the E when the programming instructions are sent, and
then transmit the E when it is desired that the 3490A
make a reading. However, if the E is not sent with the
programming instructions, the 34904 will take a readin!"
either when MRE goes LOW or when an E is sent,
whichever occursfirst. Consequently,if the 3490A was
progammed with "M3Tl. . . ." initially, and then the
statement CMD"?U6","E" was used, the instrument
would take two readingsinsteadof one asprogrammed.
Thereare two ways to preventthis:
a. After sendingthe programming instructions, d.on,t
changethe listen and,talk addresses
until the E is sent.
For example:
CMD "?U6'" "F3R7M3T1''
ö M D , . . E , , ,. . ? 5 ' \ P ,
b. First program the 34904 for no trigger, and then
reprogramit for a trigger when a readingis to be made.
For example:
CMD "?U6", "F3M3R7T3E', (The E is optional in this statement)

c \ t D " ? u 6 " ., . T l E " , , . ? 5 V "
-1-ll

3-138. The following instructions must be observedfor
reliableprogramming.
.j

1. The 3490A cannot receive programming data
whilö it is making a reading.Therefoie,if tn. :+gOR i,
allowtid to sample,programming instructions from the
card reader will be ignored by the 3490A while it is
making a reading.Two methods may be usedto control
sampling.
a. Before programming, set the 3490A Sample
Rate control to the HOLD position. Do not program
trigger mode. Instead, after programming is completed, change the Sample Rate control manually
from the HOLD position to the desiredsamplerate.
Then if a subsequentchangein the 3490A programis
necessary,the SampieRate control must be set to the
HOLD position again before programming.
b. Set the 3490A Sample Rate control to the
HOLD position and program the 3490A for trigger
mode T1 , Immediate Internal Trigger.In this mode,
the 3490A will continue to sample at the maximum
rate, and the front panel control setting will haveno
effect. In order to reprogramthe 34904 under these
conditions, the 3490A Une switch should be tumed
OFF and back ON again.This returnsthe instrument
to local (front panel) control.

Model3490A

SectionIII

rffi'slisli r.l.i...l*jiiä='8ffifr
349OA
lrrruE

SEETABLE 3.7

NO.

I

)tEr

co0E

iLEAR 2 7 - l
2C.C,

B L A N KL I N E +

3

9

,21

],'ir

z o or o o l 4 0 z o r o l +

Ei!
r

r
l f l

E

T

I

PRoonnvr

E

z

I

-

r
r

rir
alr

r
r

E

El

=!n

E

r

r

EIE

trf r

I

r
c=
c=

C : I

06l

Etrf

F

toG

E

6
R

0,60
t22

I

E r
EIt:]
E
-rtrl i trfIfl

[f

E

4

o64

E

E

r

r:

E = I

to

M

l l

I

t5
06t

l?

E

to5

I

- -

E

E

13

- l -

r

c:lr

E

.

E

I

t l c f

E:]

- } E E

I T : I

--

- l U
I

U

U

ff

I

U

Figure3-10. Exampleof MarkedCard programming.

2. The line on the marked card immediately following the last line in which MRE is pulled LOW (,,200space marked) should be left blank. This enables the
3490A to be in the programming routine before the first
programming character is sent. If this line is not left
blank, the character on that line will be ignored.

3-139.SAMPLE/H0LD
(0ption
MEASUREMENTS
040or 045).
3-140.Definition
of Sample/Hold
Terms
3-141. Track/Hold. This term describesthe mode of
operation in which the "Hold" mode (see paragraph
3-14, beginswithin 400 nanosecondsafter receiptoi a
Sample/HoldTrigger command. Prior to this time, the
Sample/Hold amplifiers follow, or track, the output of
the 34904 DC Input Amplifier. Upon receipf of a
SampleiHold Trigger command, the amplifiers ..hold"
for measurementthe voltage presenton the Amplifier A
integrating capacitor at that time. After the 3490A
completesa measurement,the .track,'mode resumes.
3-142. Acquire/Hold. This mode differs from the
Track/Hold mode in that a precisedelay is addedin the
Sample/Hold trigger path. This delay allows the DC
lnput and Sample/Hold amplifiers to respond to a
full-range step input voltage before the Äold mode
begins.
3-143. Hold Mode. Following a Sample/Hold Trigger
command, the Sample/Hold AmplifierJ A and B retain
Ior measurementthe voltage present at Amplifier A
when the Hold command was received. During this
retention period. the Sample/Holdamplifiersare saidto

be in the Hold mode. Theseamplifiersare also placedin
the Hold mode during the run-down, or discharge,
portion of the measurementcycle.
3-1u14.Track Mode. After completion of a measure_
ment, the Sample/Hold amplifiers follow, or track, the
input voltageuntil they are placedin the Hold mode by
a subsequentSample/HoldTrigger command.This con_
dition is referredto as the Track mode.
3-145. Aperture Time. This is defined as the period
betweenreceipt of a Sample/HoldTriggercommand and
the time at which the Sample/Hold switching circuits
.place Amplifier A in the Hold mode.
F 3-146. Maximum
Acquisition Time. This is the time
required for the DC Input and Sample/Holdamplifiers
to respondto a full-rangestepinput voltage.
3-147. Delay. This term, as used in connection with
Acquire/Hold operation, refersto the delay addedin the
Sample/Hoid trigger path which extends the aperture
time to include the acquisitiontime.
3-148. Sample/HoldTrigger(TTL). This is the dc coup
led commandto the Sample/Holdcircuits which initiates
a Hold mode. The sigral must go from HIGH to LOW
for a minimum of 30 nanoseconds.It must go HIGH at
least 600ps prior to going LOW. (SeeFigure 2-l l.) This
commandwill initiate a 3490A measurementonly under
certain conditions (see Paragraph 3-165). The term
"Sample/Hold
Trigger" is used as a generalterm in this
manua.l,referring either to a dc coupled or ac coupled
triggersignal.

3-l 5

SectionIII

Model34904

3-149. Sample/Hold AC Trigger. This ac coupled command has the same effect as the Sample/Hold Trigger
command (TTL). This signal must be a negative-going
pulse at least 30 nanosecondswide with an amplitude
between 2Y and 200 V. The signal must be static at
least 2 ps prior to the negativetransition.
3-150. Hold Command. This is an intemal commandto
a Sample/Holdamplifier,resultingin a Hold mode. Hold
A command switches Amplifier A and Hold B switches
Amplifier B. Both commands are generated in the
Sample/Holdlogic circuits.
3-151. External Encode. This command initiates a
3490A measurementwhen the Sample Rate control is
set to HOLD. This signalmust be from HIGH to LOW
for a minimum of 240 ps.

3-152.Special
S/H0perating
Gonsiderations.
3-153. Display. When the 3490A is operatingin either
the Track/Hold or Acquire/Hold mode, the fifth digit in
the display is normally blanked, leaving a display of 4
full digits plus the overrange"1". This is done because
of the uncertainty in the fifth digit due to noise.
However, if the instrument is equipped with the Data
Output (BCD) Option 021 or the GPIB Option 030, the
output data includes the fifth digit. The fifth digit can
be restored to the display if desired by changing the
connection of the white/black wire from the display
assembly. For a 4 - digit S/H display, this wire is
connected to Test Point L on the Main Circuit Assembly, Al, and for a 5 - digit display,it shouldbe moved to
Test Point M. These test points are located on the Main
Circuit Assembly just to the rear of P2, which is the
display cable connector.
-._"
3-154. .1 V Range. Sample/Hold measurementaccuracy is not specifiedfor the .l V range.On this range,the
output of the Input amplifier contains an appreciable
amount of wideband noise due to the broad bandwidth
of the amplifier and the amplifier gain of X100. The
rapid response time of the Sample/Hold circuits allows
the Hold mode to occur anywhere rvithin the envelope
of the noise3-155. Autoranging. Autoranging requires successive
readings (initiated internally) when changing ranges.
Consequently,the final reading losesits time relation-

ship to the extemal trigger and therefore is not useful
Sample/Holdinformation.

3-156.Guard
Connection
in Sample/Hold
Meaurements.
3-157. The Guard terminal should always be connected
to the Low input terminal when making Sample/Hold
measurements,unless the guard can be properly driven
by a low-impedanceand low-noisesource.

3-158.InputSignal
Limitations.
3-159.The analog-to-digitalconversionprocessrequiresa
certain amount of time, and any change in the voltage
input to the A-to-D conversion circuits during this time
degradesthe accuracyof the measurement.The purpose
of Sample/Hold is to "fresze", or hold, a changinginput
voltage at a specific point in time and accurately
measure the voltage. The bandwidth of the Input
Amplifier and the response time of the Sample/Hold
Amplifiers restrict the rate at which the voltage to be
measuredcan change.The Sample/Holdcircuits are able
to maintain tracking only if the rate of change of the
input voltage is within the follo,wing limits:
2.5 %rangelpson the l0 V and 1000 V ranges.
5 % of rmgelps on the I V and 100 V ranges.
The rate of changein input voltage (dv/dt) affects the
ability of the instrument with SampleiHold to digitize a
ramp or sine wave. Table 3-8 showsthe maximum dV/dt
for a ramp and the maximum frequency for a full-range
sine wave to be measuredwithin the accruacy given. The
input signal is also limited to a maximum dV/dt during
digitizationof 50 V/ss.

3-160.Sample/Hold
Trigger
Requirements.
Signal
3-161. Either of two signal inputs may be used to
initiate a Hold mode. The Sample/Hold Trigger input
(TTL) is dc coupled, and the AC Trigger input, of
course,is ac coupled. The term "Sample/Hold Trigger"
is used as a generalterm in this manualto refer to either
signal. tn some option combinations, a Sample/Hold
Trigger does not initiate a 3490A measurement(see
Paragraph
3-165).

Table 3-8. Ability of Sample/Hotdto Digitizea Rampor SineWave.
BANGE

10v

Acc|Jracy*
(% of Rangef

Ramp
.01 %
1 %

1 %
*Accuracy

-1-lo

30v/s
300v/s

3000v/s

1 V, 100V, 1000v

Sine Wave
lZero Crossing)

Sine Wave
(Peak Reading)

5Hz
5O Hz
5O0 Hz

75OHz
275O Hz
75OOHz

Ramp
12.5 V lS
125 V/S

1250V/S

specifications are to be added to (% of range) dc specification.

Sine Waw
(Zero Crossing)

Sine Wave
{Peak Reading)

2Hz
20 Hz
2OOHz

3OOHz
90O Hz
3ü)O Hz

SectionIII

Model3490A
3-162. Sample/HoldTrigger (TTL). Compatibility with
TTL logic circuits requiresthis signalgo be from HIGH
(>+ 2.4 V) to LOW ((+ 0.4 V) for a minimum of 30
nanosecondsin order to initiate a Hold mode. The signal
must be HIGH for at least 600 ps prior to going LOW.
The external triggering circuit must be capableof sinking
I mA at (+ 0.4 V.
3-163. AC Trigger. The leadingedgeof a negative-going
pulse at least 30 nanosecondswide and 2 V to 200 V in
amplitude initiates a Hold mode. The sigral must be
stable for at least 2 ps before the negative-goingtransition.
3-164. Termination of Unused S/H Trigger Input Connections. When operatingin a Sample/Holdmode, some
to preventunwantedtriggering
precautionsare necessary
of the SampleiHold circuits, which can be caused by
crosstalk within an external cable attached to the trigger
input connector. Only one of the two triggerinputs will
be used at any one time in a given situation, and
spurioustriggeringat the other input may be prevented
in one of two ways:
l. The unusedinput may be left open; that is, with
no wire in the cable connected to this pin on the
connector.
2. The unusedinput may be terminatedat the other
end of the cable. The TTL Sample/Hold Trigger (dc
coupled) input line shouldbe connectedto a HIGH logic
level ()+ 2.4V). The AC Trigger input line should be
connectedto a LOW logic level (<+ 0.4 V).

3-165.Initiating
a Sample/Hold
Measurement.
3-166. The Sample/Hold option is available in three
different configurations which employ various methods
of initiating a Sample/Holdmeasurement.SampleiHold
is aväilable with the BCD/Remote Expand Option 020.
(Either Data Output Option 021 or Remote Control
Option 022 or both may also be installed with Option
020.) Sample/Hold is also available with the General
Purpose Interface Bus I/O Option 030. In the third
con{iguration, Sample/Holdis availableas Option 045,
without any of the other options. No data output or
remote control, except Sample/HoldTrigger,is available
in Option 045. The following paragraphsdiscussmethods of initiating a measurementin instruments having
the various options. Table 3-9 lists the methods of
externally triggeringa Sample/Holdmeasurement.
3-167. Internal SampleControl, Option 045 and Option
040 with Option 020. When the iront panel Sample
Rate control is set to any position except Hold and no
Sample/Hold Trigger command is applied, the instrument will automaticallyhold and read the input signalat
the sample rate selected. However, this method of
operation providesonly random sampling,sinceit is not
possibleto s1'nchronizethe measurementto any specific
point in the input signal.

Table 3-9. Initiating S/H Measurements
by
ExternalTriggering.
Sample/Hold
Option

Other Options
in the 34904

Measurement
Initiated By:

o40

o20

Separate External Encode
command or Stretched
Pulse Output connected
to External Encode input.

040

030

Sample/Hold Trigger

045

neither 020
or O30

Sample/Hold Trigger

3-168. Internal Sample Control, Option 040 with Option 030. The 3490A with the GPIB Option 030 may be
programmed for internal sample control. If so, the
instrument will automatically hold and read the input
signal at the sample rate selected. Operating with
internal samplecontrol providesonly random sampling,
since the measurement is not synchronized to any
specificpoint in the input signal.
3-169. External Triggering,Option 045. When Sample/
Hold is present in an instrument with neither BCD
Remote Expand Option 020 or GPIB Option 030, it is
designatedas Option 045. In this case,either Sample/
Hold Trigger command automatically initiates a measurement.
3-170. External Triggering, Option 040 with Option
020. With this combination of options, a Sample/Hold
measurementmay be initiated by external triggeringin
two ways. For either method, the 34904 measurement
circuits must be in the "Hold" state.That is, the Sample
Rate control must be in the Hold position, or if the
instrument has Remote Control Option 022, the lnterface Hold line may be held LOW. One method of
initiating a Sample/Hold measurement requires two
'separate
signalinputs, a Sample/HoldTrigger command
," to initiate a Hold mode, and an External Encode
command to initiate a measurement.Both commands
may be appliedat the sametime, or the External Encode
command may be applied up to ll2 second after the
Sample/Hold Trigger. In the second method, the
Stretched Pulse Output from the Sample/Hold trigger
circuits (J7 pin 10) is connected externally to the
External Encode input (J6 pin 46 or J7 pin 24 or 28).
This connection provides an External Encode signalto
initiate a measurementimmediately upon receipt of a
Sample/HoldTrigger command.Neither signalwill have
any effect if applied while a measurementis in progress.
If a Sample/HoldTrigger command is given without an
External Encode command, the Sample/Hold circuits
will be locked in the Hold mode. This condition can be
terminatedby applying an External Encodecommand or
by settingthe Sample/Holdswitch to Off.
3-171. External Triggering,Option 040 with Option
030. When operating Sample/Hold with General Pur-

3-t7

SectionIII

Model3490A

pose Interface Bus controi, the 3490A should be
programmed for Next External Trigger (T2). When Next
External Trigger is programmed, upon completion of a
measurement the GPIB circuits wait for an External
Trigger command. Either of the Sample/Hold Trigger
inputs at Jll providesan External Triggercommand to
initiate a measurementat the sametime a Hold mode is
initiated.

3-173.Using
theTrack/Hold
Mode.
3-174. Digitizing a Ramp. The output of the Sample/
Hold amplifier circuits lagsthe 3490|input yoltageby a
delay which is approximately equal to " " I
L 1 3 d B, where
f: On ir the 3 dB bandwidth
frequency shown in Table
l-2. When measuringa stable dc input voltage,this time
lag presentsno problem. However,if the input voltageis
changing, as a ramp input for example, thii delay must
be consideredin interpreting the 34gOA reading. In
Track/Hold measurements,the voltage reading is actu_
ally the input voltage at a point previousto the time the
Sample/HoldTrigger command was received.The point
of measurement,then, effectively precedesthe trigger
command b-y a length of time equal to the delay, shown
in Figure 3-12 as the analog dähy. Digitization of a
repetitive stable ramp may be done as illustrated in
Figure 3-12. The delay between the start of the ramp
and the Sample/HoldTriggermust be accuratelydetei_
mined by somemeans,suchas an interval timer. It is not
necessarythat measurementsbe made on successive
cycles as might be inferred from Figure 3-12. Measurement may be made on every 2nd, 3rd or nth cycle as
convenient, if the waveform is stable. The maximum
dv/dt limitations shown in paragraph3-l5g and Table
3{ must be observed.

3-172. Acquisition Time. The maximum time required
by the DC Input and Sample/HoldAmplifiers to respond
to an input voltage varies with the range selected. as
shown in Table 3-10. The acquisitiontime-mustbe taien
into consideration in Track/Hold operation. The delay
incorporated into Acquire/Hold operation includes thl
acquisition time. Figure 3-l I shows typical times re_
quired for the amplifiers to respond within a specified
accuracyto a stepinput voltage.
Table 3-10. Maximum Acquisition (Settingl
Time for Full-RangeStep Input.
Range

Settling Time to Within
0.01 % of Final Vatue

1 V
10v
1 0 0v
1000v

512 tts
128 ps
512 ps
128 ps

3-175. Reoonstructingan Input Waveform. An input
waveform may be reconstructed from a series of
Track/Hold measurementsby using the secondequation

NOTE
.1 V rangeis not specified(seeparagraph3-1541.

uJ
(9

.lLl

z
200
tr
J
J

.z
(r 200

100

J
J
f
IL

tt
tJ-

a
=
uJ
F
at,
lrJ

o
öR

=

to

o-

LIJ
F
.tt
Ll,
(9

o
F
J

10

F.
J

1.0

o

F

1.0

F
f,

=

=
o

t!
UJ

100

tJ.

0.1

uJ 0 . 1
n

a

E
J

t-

=

1 V RANGE
6.6t ^
u.l ,,rs
1.0ps
IOps
IOOps
lms
TYPICALTIME REOUIREDTO SETTLLTO O.OTX

o-

0.o1
0.1 lrs
1.0 rrs
10,/s
100rc
T Y P I C A LT I M E R E O U I R E DT O S E T T L E T O1 %

Figure3-11. TypicatResponse
to a StepInput Voltage.

SectionIII

Model3490A

TNPUTVOLTAGEAT
T I M EO F S / H T R I G G E R ,

t

VOLTAGEACTUALLY
MEASURED.

/ l
/

l

I
I
I
IA
A
T
V
S

r

= ANALOG DELAY
= SAMPLE/HOLD
T R I G G E R( T R A C K / H O L D
MODE)
= VOLTAGEMEASURED
= S L O P ES
, E EP A R A G R A P H
3 - 1 2F O R M A X I M U MS L O P EP E R M I S S I B L E .

Figure3-12. Digitizinga Ramp.
shown in Table l-2 under the "Time ResponseCharacteristics" heading. The shorter the time between measurement points, the greater the accuracy of the reconstructed waveform will be.
3-176. Digitizing a Sine Wave. The rules that apply
when-digitizing a ramp @aragraph3-174) also apply to
measurement of a sine wave. Keep in mind that the
dV/dt and frequency limits given in Paragraph3-158 and
Table 3{ must be observed. The waveform may be
reconstructed from the Track/Hold measurementinformation as discussed
in Paragraph3-175.
3-177. Ramp Linearity MeasurementAided by an Oscilloscope. An oscilloscope with delayed sweep and a
delayed gate output can be very helpful in making
Sample/Hold measurementsof a repetitive waveform.
For example, linearity of a ramp can be measured
accurately,as in the following procedure.
a. Choosean oscilloscopewith delayedsweep,such
as the {rp- Model l80C with the l82lA Time Base/
Delay Generator plug-in unit. Be sure the Delayed Gate
output from the oscilloscopemeets the Sample/Hold
input signal requirements given in päragraph
Tdry:.
3-l 60.
b. Connect the Delayed Gate output from the
oscilloscopeto the S/H AC Triggerinput. lf the 3490A

has Option 020 installed, connect the S/H Stretched
Pulse Output to the External Encode input (see Paragraph3-170).
c. Connect both the Main Gate and Delayed Gate
outputs from the oscilloscope to an interval timer (such
as the -hp-Model5300Al53O2A) to determinethe delay
time accurately.
d. Connect the ramp sigral to be measuredto both
the 3490A input and the oscilloscopevertical input. The
slope of the ramp must be within the limits given in
Paragraph3-158 and Table 3-8. Trigger the oscilloscope
main sweepat the beginningof the ramp.
e. Set the SampleiHold control to TrackiHold. The
measurementwill then be triggered at the point where
the delayed-sweepintensified trace appears along the
ramp.
f. Position the delayed-sweep
intensifiedtrace at any
number of sampling points (at least three) along the
ramp, asshown in Figure 3-13.
g. The slope of the ramp betweenvariousmeasurement points can then be compared to determine
linearity. ln Figure 3-13, for example,slope AB should
be comparedto slopeBC as follows:

3-r9

Model3490A

SectionIII

b. Connect the Delayed Gate output from the
oscilloscopeto the S/H AC Trigger input. If the 3490A
has Option 020 installed, connect the S/H Stretched
Pulse Output to the Extemal Encode input (see Paragraph3-170).

vs-ve

Slope AB = -

Ts-Ta

Vc-vs

Slope BC = -

Tc-Ts
% Non-Linearity =

SlopeBC- SlopeAB

x 100
SlopeAB

A
A

,"1

",1

DELAYEDSWEEP
GATE OUTPUT

c. Connect both the Main Gate and Delayed Gate
outputs from the oscilloscopeto an interval timer, such
as the -hp- Model 5300A15302ACounter, to determine
the time delay accurately.
d. Connect a square wave generator, such as the -hpModel 33llA Function Generator, to both the filter
input and the oscilloscopeinput. Set the square wave
output to l0 V at a frequency such that the duration of
one half of the square wave is greaterthan the expected
responsetime of the filter. For example,a frequencyof
300 Hz is satisfactory for the filter shown in Figure
3-14.
e. Set the 3490A to the l0 V range,DC function and
Track/Hold operation. Connect the output of the filter
to the 3490A input terminals. If a dual-channel oscilloscopeis used,also connectthe hlter output to the other
oscilloscopeinput.
f. Position the delayed sweep intensified trace toward the right side of one half of the square wave and
determine the final value of the filter output.

Oscilloscopein
Figure 3-13. UsingDelayed-Sweep
RamPLinearitYMeasurements.
&178. Filter ResponseMeasurementAided by an Oscilloscope. Measurementof filter responsemay be accomplished by the use of Sample/Hold, a delayed-sweep
oscilloscope,a squarewave generator,and a time interv-al
counter. The following procedure tests the responsetiniö
ofa filter.

g. Shift the intensified trace toward the left until the
3490A readingis reducedto within XVo or X mV of the
final value noted in step f. The time interval counter
displays the time required to settle to this value. The
intensified trace may be positionedat the other points
to observeany overshootor ringing in the filter oütput.

theAcquire/Hold
Mode.
3-179.Using
a. Choose an oscilloscopewith delayedsweep,such
as the -hp- Model l80C with the 1821A Time Base/
Delay Generator plug-in unit. The vertical plug-in may
be either single- or dual-channel. However, the dualchannel feature permits display of both the filter input
and output at the sametime. Be sure the DelayedGate
output from the oscilloscopemeets the Sample/Hold
Trigger input signal requirements given in Paragraph
3-160.

5o6mH

3-180. Measuringa Step Input Voltage. The Acquire/
Hold mode of operation is useful for measuringa step
input voltage becausethe Sample/Hold Trigger command may be applied simultaneouslywith the input
voltage step. The aperture time, which is the delay
between receipt of a Sample/Hold Trigger and the
beginning of a Hold mode, is of sufficient length to
include the acquisition time, as shown in Figure 3-l 5.

5e6 mH

3490A W|TH
SAMPLE
/HOLD

Figure3-14. Filter Output Measurement.
_1-10

Model3490A

SectionIII

STEPINPUT

- FULL
SCALE
SAMPLE/HOLD
TRIGGER

Figure3-16. Ratio Input Connections.
reference voltage may be either a positive or negative
voltagebetween0.1 V and 1.2Y. On the l0 V range,the
referencemay be positiveor negative,I V to l2 V.
A P E R T U R ET I M E >
ACOUISITION
TIME

of a StepInput.
Figure3-15. Measurement
The step input voltage must remain stable for at least the
duration of the Acquire/Hold aperature time shown in
Table 1-2.
3181. MeasuringPulse Height. hcquire/Hold may be
used to measure the height of a pulse or square wave.
The width of the pulse (or one-half of the squarewave)
must be greater than the aperture time shown in Table
l-2. Triggering may be applied coincident with the
leading edgeof eachinput pulse.

3-182.Using50Hz or 60Hz PowerSource(Options
050or 060).
3-183. The 3490A has the capability of operatingfrom
a 50 Hz or 60 Hz power source.Option 050 is available
for 50 Hz operation and consistsof using a 3.333 MHz
crystal (Y2) in the clock and AlR207 = 100 kSr. Option
060 provides for 60 Hz operation and usesa 4 MHz crystal CYI) in the clock and AlR207 = 84.5 kQ. See Table
2-1.

3-188.lnputConnections
3-189. The dc external referenceand unknown input
voltageshouldbe connectedas shownin Fizure 3-16.

Extemal Reference Low and Input Low
must be at the same potential; these terminals are connected intemally. Connect
Guard to Input Low.

3-190.RatioDisplay.
3-191. Ifthe I V External Referencerangeis selected,
the display reads the ratio directly, but if the 10 V
referencerange is used,multiply the display by 0.1. In
dc/dc ratio measurements,the polarity symbol is + vshsn
the external reference and input voltages are the same
polarity, and - if they are opposite in polarity (seeTable
3-ll). In ac/dc measurements,no polarity symbol is
displayed. Any ratio measurementis limited to l2O % of
the input range selected. If autoranging is selected,
'upranging occurs at l2O
% of rcnge and downrangingat
lO% of range. Overload indication is the same as in
voltagemeasurements.
Table 3-11. Ratio Polarity Display.

(0ption080).
$184. RATIOlf'leasurements
3185. Instructionsfor makingratio measurements
with
the Model 3490A, Option 080, are contained in the
following paragaphs. DC-to-dc and ac-to-dc ..threewire" ratio measurementscan be made; that is, the EXT
REF input Low terminal and the INPUT Low terminal
are connectedintemally. Becausethe sameterminalsare
used for Ohms measurementsand for Ratio measurements, these two functions are mutually exclusive.

External
Reference
I nput

+
+

I nput
Signal

Displayed
Polarity

+

+

+
+

ac
ac

+
none
none

$186. External
Beference
Voltages.
3187. The front panel Ratio switch selectseither the
lntemal Referenceor the I V or l0 V External Reference range. If the I V range is selected,the external

3-192. RatioMeasrement
Procedure.
a. Set RATIO switch to I V or l0 V EXT REF
range.If the external referencevoltageis between1.0 V

3-21

tu

SectionIII

Model3490A

and' 1.2 V, the I V range should be used for greater
accuracy.

sincetheseterminalsare connectedinternally.

b. Connect External Reference(dc only) to EXT
REF terminals.

f. Read ratio display directly if I V EXT REF range
is selected.If 10V EXT REFrangeisselected,multipiy
displayby 0.1.

c. Select DC or AC FUNCTION to correspondto
input signalto be measured.

NOTE

d. Set RANGE switch to desired range or to AUTO.
e. Connect input signal(dc or ac). Input signalLow
and External ReferenceLow must be at samepotential,

J-L-

When operating in Autorange mode with less
than full-rcale External Reference input
(<1 V or 110 V), the first readingfoiowing on uprange will be incotect.

Model34904

SectionIV

S E C T I OI V
N
T H E O RO
YF OPERATION
4I. INTBODUCTION.
42. This section describes the methods and circuits
used in the Model 3490A Multimeter to make dc
voltage, ac voltage, and resistance measurements.The
circuits needed for ratio measurement,sample-and-hold
remote control, and data output are also
measurements,
described.A generaltheory ofoperation is followed by a
more detailedexplanationof the circuits used.

Y FO P E R A T I O N .
+ 3 . G E N E R ATLH E O RO
44. The Model 34904 Multimeter uses the dual-slope
integration technique for measurement(seeFigure4-1),
in which an integrator chargesfor a fixed length of time
to a voltageproportional to the input sigral, and then is
discharged at a fixed rate determined by a known
reference voltage. The measurement display is determined by the discharge time, which is proportional to
the input sigral. The integrator is part of the Analog-toDigital Converter shown in the Basic Block Dagram in
Figare 4-2. A description of the basic operation of the
3490A is contained in Figure 4-2 and Paragraphs4-5
through 4-l 8.

45. Signal
Conditioning
Gircuits.
46. The signal conditioning circuits include the DC
Input Attenuator, the AC Converter, and the Ohms
Convertercircuits. The output ofone ofthese circuits is
applied to the DC Amplifier for the run-up portion of
the measurementsequence.
47. ReferenceVoltages.
4-8. One of three referencevoltagesis applied to the DC
Amplifier input for the run-down portion of the

measurementsequence.The proper referenceis selected
by the Logic circuits accordingto the function selected
and/or the polarity of the input signal.

+9. DCAmplifier.
z1-10.The DC Amplifier output is l0 Vdc for a fullrange input on any range in any function. For any
measurementexcept Sample/Hold,this output goes to
the Analog-to-Digital Converter circuits. In Sample/Hold
measurements,
the DC Amplifier output is appliedto the
Sample/Holdcircuits (seeFigure 421), nd the Sample/
Hold output is appliedto the A-to-D Converter.
4l 1. Analogto-DigitalConverter.
412. The Analog-to-Digital (A-to-D) conversioncircuits
consist of an Integrator, followed by a x20 Amplifier
and,a Zero Detect Amplifier. If the Integrator input is
positive during run-up, the A-to-D output goes HIGH
(near + 5 V) during run-up and retums to LOW (near
0 V) when the Integrator is dischargedto zero. If the
input is negative,the A-to-D output goes LOW during
run-up and HIGH at the zero detect point. Input signal
polarity, as well as "end of measurement"information,
is derived from this output signal. The length of time
betweenthe start ofrun-down and the zero detect point
determinesthe numericalvalue of the display.

413. Logic.
4-14. The timing of the measurement sequence is
. .qontrolled by the logic circuits. This timing may be
influencödby the rangeand function selected.The basic
'"' clock is a crystal-controlledoscillator, from which a
number of timing signals are derived through dividing
counters. The sample rate is controlled by the logic

G R E A T E RI N P U T_

S M A L L E RI N P U T -

-

-

-

-

.r\?

ßüy
\-

INTEGRATOR CHARGES
FOR FIXED TIME.

RO

INT€GRATOR DISCHARGES
AT FIXED RATE.

3490-8-3584

Figure4-1. Dual-Slopelntegration.
4-1

Model3490A

Section IV

+REF<
.REF -{
o R E F{

MEASUBEIVIEN
TOUENCE
SE

l
r
l
l
o

T

r

t

l
l
l
l
r

r

T

t

z

l

l

z

T

r

l

tz

tr

oTr

Prior ro the run{p portion ot the m@su.erent sequence, the 3490A inerts any delay requi.ed by the
smple rate control sening, and any delav rhat may be required by the fundion and range selections.
During lhis time. the input to the DC Amplifier is grounded and this amplifier and the Integrator arc
in lhe Auto-Zero state (see Para$aphs 4-37 and 4-5O).

tTz

Following any delay required, the input signal is applied to the DC Amplifier and sufficient time is
allowed lo. the amplitier to settle belore the run{p period begins.

2 T3

The I ntegrator charges tor a fi xed p6iod

3Ta

Signal pola.iry is determined and the prop€r referen@ wltage
rhe DC Amplilier in plee of the input signal.

eTs

The liltegrator discharge. at a tixed rate which is determined by the reference wltage.

sTo

ll the instrument is in autoJange, it determin6 whether the reading is on the @rrect range. It not, it
upranges or downranges ooe range aod.initiat€s another reading.

5Tq

This is an Auto-Zero

of ti me to a rcltage proponional
is plected-

lo the input rignal .
The relerence is applied to

period of 65 ms. (See Paragfaphs 4-37 "nO q-SO.l

s490 - a-55!3

Ftgure4-2. BasicDiagramand Operation.
circuits, and is dependent upon the sample rate switch
setting, as well as the function and range selected. In
auto-rangeoperation, the logic circuits selectthe correct
range. The input polarity information is utilized by the
logic circuits to selectthe correct referencepolarity for
run-down.

4-17.Range
andFunction
Control.
4-18. Rangeand function may be selectedby the front
panelswitchesor remotely, if the instrument is equipped
with one of the remote control options. Remote control
is provided by Option 022 paragraph Ll74), or by the
General Purpose Interface Bus I/O Option 030 (Para$aph4-196).

415. Display.
,1-16. The display consistsof six digits; however, the
most significantdigit is either zero or an overrange"1"
during normal measurements.During the logic test
operation (Test No. 1), other numbersare displayedin
this dist. The display also contains a polarity symbol
"overload"
and an
annunciator light. If the instrument
has a RemoteControl option, a "REM" annunciatoralso
lights *tren remote operationis selected.
!

.

CIRCUITS.
+ 1 9 . D CA N A L 0 G
ar20. In general,the following explanationsof both the
analog and digital circuits describe the circuits outlined
in the block diagramshownin Figure 7-18.

421. lnputAttenuator.
4-22. A simplified diagam of the Input Attenuator and
DC Amplifier circuits is shown in Figure 4-3. The Input

Model 34904

SectionIV

Attenuator is switched by reed relays which are controlled by signalsfrom the DC Switching Logic circuits'
No attenuation is used on the .l V, I V and 10 Vdc
Ranges.Attenuation of 100 is used on the 100 V and
100ÖV ranges.No attenuation is requiredfor resistance
measurements,becausethe full-rangevoltageacrossthe
resistancebeing measuredis not greaterthan l0 V. In ac
voltage measurements,the AC Converter output is
applied to the DC Amplifier through a FET (Field Effect
Transistor)switch, and the dc attenuatoris not used.

4-29.BoottrapCircuit.

+23. DCAmPlifier.

4-32. lnternal reference voltages are provided for the
run-down portion of the measurement sequence.In dc
measurements,
if the input voltageis positive,the - l0 V
referenceis used; and if the input is negative,the + l0 V
referenceis used. In ac measurements,
the AC Converter
output is positive requiring the negative reference for
run-down. The Sl reference,used in resistancemeasurements, is generated by the Ohms Converter and is
approximately- I V.

424. The DC Amplifier is a differential amplifier circuit
using a FET input stageto provide an input resistance
sreater than l0ro ohms on the .l V, I V and lOV
i*g.r. Input resistanceon the 100 V and 1000 V ranges
is l0MO, as determined by the attenuator. The pushpull output stage is protected by diodes which prevent
excessiveoutput current. The amplifier output is f or
- 10 V full range for aU rangesand functions. In normal
operation, this output is applied to the Integrator
circuit. If optional Sample/Hold operation is selected,
the DC Amplifier output is applied to the Sample/Hold
Analog circuits.

Gain.
+25. OCAmplifier
4-26. T\'rc gain of the DC Amplifier may be l, l0 or
100, and is determinedby the feedbackpath selected.
FET switching circuits are used to select the fee{back
resistanceratios, and the gain is equal to FRI-I -FR2,as
FR2
shown in Figure 4-3.

OUTPUT
a M P L T F I E FC A ] N- - - i ARI
9.9 M
FRI

AR2
O.IM

aTTENUaTToN,

aR2

$$

GAN
xr
xro
xroo

FRI FR2
roox
o
90K roK
x
99K

Figure4-3. SimplifiedDiagram,DC Amplifier.

4-27.Switching
Circuits.
4-28. Figure 4-4 shows the 3490A measurementsequence.During the charging,or run-up period, the input
sigtal is applied to the DC Amplifier input. During the
discharge,or run{own period, the proper referenceis
applied. Switching of thesesignalsand others such as a
Feedback Attenuator and Auto Zero circuits. is accomplished by FET switching circuits. These FETs are all
contahed in one microcircuit package, A2UZ, and are
driven by signalsfrom the DC Switching Logic circuits.

4-30. The gate-to-sourcebias for the switching FETs is
provided by a voltagewhich is bootstrappedto the DC
Amplifier input voltage to provide the proper turn-on
and turn-off bias. The input of the unity-gain Bootstrap
Amplifrer, shown in Figure 7-20,is connectedto the DC
Amplifier feedbackline.
l[.31. ReferenceVoltages.

4-33. OverloadProtection.
4-34. Protecfion againstexcessiveinput voltage is provided at the DC Amplifier input. On the 10 V, 100 V
and 1000V ranges,the input is limited by breakdown
diodes to approximately 1 13 V. On the .1 V and I V
ranges,the protection circuits are switchedto limit the
input to the amplifier to approximately x 2 V. Overload
protection is also provided at the amplifier output by a
diode circuit in parallelwith the feedbackattenuator.If,
for example,the amplifier is operatingwith a gain of l0
or 100 and the output voltage exceedsapproximately
+ l6 V, the diode circuit beginsto conduct, reducingthe
amplifier gain, with a correspondingreduction in output
voltage.If the amplifier is operatingwith a gain of l0 or
100, the gate of the xl gain FET (K in Figure 44)isar
- 17 Y.If the amplifier output goesexcessivelynegative,
as it approaches- 17 V, the xl gain FET beginsto turn
on, reducing the amplifier gain and its output voltage.
€onsequently,the amplifier output is limited to approximately1 16 V.

4-35.Leakage
Gontrol.
4-36. A FET switch (B in Figure 44) is also provided
which disconnectsthe three referenceFETs (F, G, H),
the AC Converteroutput FET (E), and the .01 Attenuator FET (D) from the amplifier input during run-up
when the xl Attenuator line is being used.This reduces
the posibility of leakage from these circuits into the
high impedanceDC Amplifier input circuit.

4-37.DCAmplifier
AutoZero.
4-38. During certain portions of the measurementsequence,as shown in Figure44,lhe DC Amplifier circuit
is automaticallyzeroed.At the completionof a measurement, the amplifier input is groundedthrough the Input
Short FET switch C. The Auto Zero signalthen turns on
FET switch J, placing the amplifier in a xl gain

4-3

SectionIV

Model3490A

l+-H-------l

sEE NOTES ON FOLLOWTNG .."........PAGE.

t-a -N.- B-rt-- c -++

lr
r
lr
lt
l
t
r
l
. warrrNc, DELAy serecr serrrrncl
lpEgroolpenroolcartslpenrool
'l
1
|
I
I

MEASUFEMENT SEOUENCE
FOR FULL RANGE NEGATIVE
tNPUT. NOT DRAWN TO TIME
OR VOLTAGE SCALE. ALL
TIMES SHOWN ARE FOR 60 Hz
OPTION. FOR 50 Hz OPTION,
INCB€ASE TIM€S BY 2O%,

lt

FET
SWITCH

ti

'*'{t

r

i^gff*i l

i'Xk

rP.f'
MIN

'|

t

@!!
MIN

sms

'|

t

sms

l

50is

|

5ms

l

ON
OFF

11

IV,1V,10VDC
A L LI I

ON
OFF

1m v. 1000voc

ON
OFF

ALL BANGES
& FUNCTIONS

ON
OFF

lm v. 10m vDc

ON
OFF

ALL AC RANG€S

ON
OFF

ALL DC RANGES,
NEG INPUT

ON
OFF

ALL t} RANGES

ON
OFF

oN
ALL ExcEPTsAMPL€/
HOLDMEASUsEMENTSOFF
ALL RANGES
& FUNCTIONS

ON
OFF

10v, 1000vDc
RANGES

ON
OFF

r v , r v . ! 0 0v D c
BANGES,ALL
AC

ON
OFF

1 0K . 1 m 0 K
10.000Ktl

ON
OFF

r v. rmvDc

2t

H

oN

RANG€S,ALL AC

OFF

I K. lOOKQ BANG€S

ON
OFF

r K . 1 0K , 1 m 0K ,
IO,OMKQ RANGES

ON
OFF

I VOC..t KQ RANGES

^::

ALL OC RANGES.
POS.INPUT, ALL AC

3490A- C-2940

ELECTRONIC
swtTcH

ON
OFF

ON

'-{
INPUTSHORT

"""
J

tt",

MTB

I

Figure4-4(al. Measurement
Sequence.
l

1

^

i-----}...'otu''

F--r-. c i
rl

ll

ll

|
|
|

|

I

|
|

|
|

i

itYrs

i

r

I to
I,

RANGE &
FUNCTION

lf

,Oü

MAIN TIME BITS CAA

A2U2
PIN

ri

J---{

---i*

I srone I srrecr |
lporlnttvl nEr |
cr-,1--!----t

i

i :l;s, :y;si
,
,

||-

.K

r -----]---+---]-.

5ms

65 ms

SectionIV

Model34904

DC AMPLIFIER

ac coNv
OUTPUT
J6N'AUTOZERO
I.AUTO ZERO DISA6L€,
USED ONLY DURING
SAMPL€/ HOLD OPERAIION

The following notes refer to waveforms on preceding page:

J. Integrator
rundown (0 - 60 ms).

A . A U T O Z E R O : l f h o l d i s s e l e c t e d ,w a i t f o r t r i g g e r . l f h o l d
is not selected, determine sample rate delay. Check
function and range. lf range is not valid for function
selected, uprange and downrange as necessary.

K. Selectreferencepolarity or ohm's reference.

8.

AUTO ZERO: Insert response time delay required for
range and function selected. DC = 0 delay; AC = 85 ohms
delay; 10 Mo = 350 ms delay; 1 MA = 50 ms delay; other
ranges= 0 delay.

C. Rangegain with input short (FET Cl. Gain can be either
FET K, L, or M.
D . I n p u t s i g n a la p p l i e d t o i n p u t a m p l i f i e r .
E. Reference applied to input amplif ier.

H I G HT R U EW A V E F O R MI N F O R M A T I O N
AUTO ZERO=MT-B
S I G N A LV O L T A G EG A I N = M T A , M T B
S I G N A LV O L T A G EA P P L I E D= M T A . M T B ,M T C
REFERENCV
E O L T A G EG A I N = M T A , M T B
REFERENCEVOLTAGEAPPLIED= ili=iÄ,TUTC
INPUTSHORT= MTCMTA, B AND C ARE SAME
A S M D A ,B A N D C I F T H E R E
ISNOSAMPLE/HOLD.
N O T E1 .

F . R e f e r e n c eg e i n w i t h i n p u t s h o r t e d ( F E T K ) .
G. Auto Zero (65 ms of auto zero).
H . I n t e g r a t o rr u n - r u p ( 5 0 m s ) .

MODE

P U L S EI N T E R V A L

DC
AC
ol M
s , 1 0M

65 ms
915ms
1 1 5m s
4 1 5m s

Figure4-4(b). MeasuibmentSequenceNotes.
configuration. At the same time, FET switch N grounds
the feedback capacitor. As a result, the capacitor is
referenced to ground and the amplifier input is held at
zero during the Auto Zero period. Any residualoffset in
the amplifier is stored in the feedback capacitor. During
the following measurement, the voltage stored in the
capacitor appearsat the inverting input of the amplifier
and cancelsthe amplifier offset.

discharged at a fixed rate determined by a known
referencevoltage. Since the dischargerate is constant,
the dischargetime is proportional to the amplitude of
the charge (and the input signal). The Data Counter
accumulatesthe number of clock pulsesreceivedduring
the dischargetime, and this number is then displayed as
the measurementamplitude. Figure 4-5 is a simplilied
diagramof the Integrator circuits.

4.39.INTEGRATOR
CIRCUITS.
440. Dual-Slope
Integration.
4-41. The 34904 usesthe dual,slopemethod of analogtodigital conversion. The integrator chargesfor a fixed
period of time, as indicated in Figure 44. The charging
rate and resulting amplitude of the charge are proportional to the input signal. The integrator is then

Amplifier.
442. Integrating
443. Tl're output of the DC Amplifier is applied to the
Integrator through the FET switch at its input only
during run-up and run-down. The Integating Amplifier
is inverting, so if, for example, the input voltage is
positive during run-up, the integrator output ramp is
negative.

4-5

SectionIV

Model3490A

E L E C T R O N I CI N T E G R A T I N G
SWITCH
AMPLIFIER

XzO AMPLIFIER

ZERO
DETECT
AMPLIFIER

INPUT FROM
OC AMP

ANALOG Z E R O
D E T E C T TO
L O GI C

Figure4-5. Simplified Diagram,IntegratorCircuits.

L44. x 20Amplifier.

450. IntegratorAuto Zero.

445. The output of the IntegratingAmplifier is applied
to an inverting amplifier having a gain of 20, whose
output is limited to approximatelyt 0.6 V by a parallel
complementarydiode connection betweenits input and
output. This output is then applied to the Zerc Detect
Amplifier. A feed-forwardconnectionis made from the
Integrator input to the non-invertinginput of the x 20
Atnplifier. This reduces noise and switching transieq{s
generatedat the integrator, since any noiseis appliedto
both inputs of the x 20 Amplifier simultaneously.
n

4-51. Any chargeremainingon the integating capacitor
at the end of rundown must be removed before the
beginning of the next measurement.The Auto Zero
Circuit accomplishesthis by connecting one input of the
Integrating Amplifier to ground and the other to the
x 20 Amplifier output. Using its own invertedoutput as
a reference, the Integator then dischargesthrough an
RC circuit. Since the Integrating Amplifier is gounded
during Auto Zero, wry residualoffset in the Integrating
and x 20 Amplifiers will be stored in the Auto Zero 2 pF
capacitor(seeFigure4-5). During the following measurement, this.voltage stored in the capacitor cancelsthe
amplifier offset.

446. ZercDetectAmplifier.
447 . The Zero Detect Amplifier is a high-gain operational amplifier. If the Integratorinput is positiveduring
run-up, the Analog Zero Detect Output goes HIGH
during run-up and returns to LOW at the Zero Detect
point. If the input is negative,the Analog Zero DeLect
Output goes LOW during run-up and HIGH at the Zero
Detect point. A frxed percentageof the referencevoltage
is applied to the inverting input of the Zero Detect
Amplifier to determine the level at which Zero Detect
will occur. The Analog ZeroDetect output goesto the
Zero Detect logic circuits.
448. ElectronicSwitch.
4-49. Two FET switchesat the input to the Integrator
act as a sinele-poledouble-throwswitch. During run-up
and rundown. the Integrator input is connectedto the
DC .tmplit-rer output, and at all other times it is
coflreu-tcd
to ground.
J-tt

4 . 5 2A
. CC O N V E B T E B .
z1-53.The AC Converterusedin the 3490A is an average
responding circuit, calibrated to the rms value of a
sinusoidal input. A simplified diagramis shown in Figure
4-6.

4-54.ACAttenuators.
4-55. Ranging in the AC function is accomplishedby
attenuatingthe input sigral and adjustingthe amplifier
gain, which is inversely proportional to the feedback
voltage. Table 4-1 shows the attenuator and amplifier
gainsfor eachrange.The converteroutput is + I Vdc for
full-rangeinput on all ranges.

Amplifier.
4-56.Converter
4-57. A dual FET is used in the input stage of the
AC-to-DCConverterAmplifier to maintain a high input
impedance.Two ac feedbackpathsare provided,so that

SectionIV

Model34904

INPUT
ATTENUATOR
rNeur{

CONVERTER
AMP

RECTIFIER

?M
K?

DCFEEDBACK
AMP 25oK

F IL T E R

OUTPUT
DC AMP

3490A-A-2824

50K

FEEDBACK
ATTENUATOR

Figure4-6. Simplified Diagram,AC Conyerter.
Table4-1. AC Amplifier Ranging.

Range

1 V
10v
1(X)v
1000v

I nput
Amplifier
Gain
Attenuator
1
1
0.o1
0.01

1

o.1
1
0.1

Referencevoltage. A simplified diagam of the Ohms
Converteris shown in Fizure 4-7.

Total
Gain

1
0.1
0.01
o.001

a gain of I or gain of 0.1 may be selected.DC feedback
stabilization is provided through an integating amplifier.
Saturation of the Converter Amplifier is prevented by a
diode protection circuit which limits the output to
approximately1 7 V peak.
&58. Rectifierand Filter.
zt-59. The output of the Converter Amplifier is rectified
by a half-wave rectiher, resulting in a positive output. A
complementary diode in parallel with the output rectifier diode is used to provide a full-wave ac feedback to
the amplifier input. Active filtering is used so that the
necessaryfiltering can be obtained with capacitors of a
practical size. In ac measurements,the output of the
converter is applied through a FET switch (E in Figure
44) Io the DC Amplifier during run-up.

4.60.OHMS
CONVERTER.
461. The Ohms Convertersuppliesa referencecurrent
through the resistancebeing measured.The resulting
voltage drop, which is proportional to the resistance,is
measuredin the same manner as a dc voltage input,
except that the Q Referenceis used for run-down. A
resistancemeasurement,then, is the ratio of the voltage
developed across the unknown resistance,to the Q

4-62.Current
Source.
443. One input of the operational amplifier in the
current sourceis referencedto ground.The ,fl Reference
voltage (approximately - I V) is applied to the other
input through a referenceresistance,Rr.1, whose value is
selectedaccordingto the ohmmeterrange.The nature of
an operational amplifier is such that it tends to maintain
both inputs at the same potential. This requirement
cannot be satisified by cunent drawn from the FET
input; consequently,it must be met by the feedback
current, which passes through the resistance being
- measured,R1. As the amplifier output goes negative
becausedf the negativeinput, the transistorat its output
'"' is forward biased. The resulting feedback current is
automatically adjusted by the amplifier to cause a I V
drop across R.e;. The value of the current, then, is
inverselyproportional to the valueof R1s1.

Power
464. 0hmmeter
Supply.
4-65. An output from the State Clock (see Logic
Circuits) is applied to a divide by six counter. The
counter output is then applied to both ends'of a
center-tapped transformer primary. (The signal at one
end is inverted and the other is not.) The output of the
transformer secondary is rectified by a full-wave rectifier, and this floating voltage is used as a supply for the
Ohms Converter circuits. This permits 4-terminal resistance measurements,since the A Sipal Low is not
internally connected to circuit common during run-up.
The Ohmmeter Power Supply is disabled during all
measurements.
measurements
except resistance

+7

SectionIV

Model3490A

F E ED B A C K

C U R B E N TS O U R C E

'J

6.8K

O U R I N G R U N . D O W NO N L Y

,oo.

I
)

/

rnre

RRer

K1

II

,I K
1 K
1 0K
1 0 0K
1.000K
10.000K

V
O R E FT O
DC AMP

I K
I K
I K
1 0 0K
100K
1 lvl

CURRENT
1 A P P R O Xl

l0 !A
l0 !A

Figure4-7. SimplifiedDiagram,Ohms Converter.
proper combination of signals to the Scan Decoder.
Three scan signals,A, B, and C, are applied to the Data
+67 . An emitter follower, whose base is referenced
Counter to releasethe stored BCD count information
through a voltage divider to a 5.6 V zener diode.
one digit at a time, beginningwith the least significant
providesa stablereferenceof approximately- I V across
digit, Nl. These scan signalsare also used in the Data
the reference resistor Rrs6 (Figure 4-7). This reference
Output and Remote circuits.
voltage, applied to Rpsg, determines the amount of
current supplied to R1 by the current source, as
4-75. ScanDecoder.
explainedin Paragraph442. A resistancemeasuremenr,
then, is the ratio of the voltageacrossR* to the voltage
4-16. The four signaloutputs from the ScanGenerator
across R1s;, both voltages being determined by the
are fed into a 4-to-10 line decoder.The decoder then
current resultingfrom the referencevoltage.
appliesan enablepulse to each display unit at the same
time that unit receivesthe BCD count information from
468. InputProtection.
the Data Counter. Scanningis continuous, with all six
display units being scannedin approximately 1.6 ms,
4-69. Protection againstexcessivevoltagewhich may be
beginningwith the leastsignificantdigit, Nl.
accidentally applied to the front panel Q Signalterminals is provided by a gas dischargedevice across th:ä
terminals and a resistancein series with the hieh
terminal. Voltages in excessof 250 Vrms may deströy
4-78. The function signals,from either the front panel
the I kfl seriesresistor.
switch or remote control, are gatedso that the symbol is
disabled during ac and ohms measurements.When the
+70. 0ISPLAY
(Figure
ASSEMBLY
7-2?).
symbol is enabled, the minus sign is on continuously,
and the vertical bar is turned on when the reading is
471. Display
Units.
positive. The sample rate indicator, contained in the
polarity unit, is on when Main Timing Bit A is HIGH.
4-72. Each of the six numerical displayunits containsa
4 x 7 dot matrix of light-emittingdiodes(LED$ to form
4-79.Decimals
andAnnunciators.
the digits. In addition, each unit contains a decoding
circuit to light the proper LEDs, and a latching circuit,
4{0. Range information from the Range Counter is
so that the displaycan be changedonly during an enable
gated to turn on the correct decimalfor eachrange.The
signal.Each unit alsocontainsa decimalpoint to the left
Overload annunciator is turned on by the Overload
of the number. The polarity unit also contains the
signal stored in the Logic. The Remote annunciator is
samplerate indicator. Each annunciatorat the right side
driven by a circuit on the Remote Assembly.The other
of the displayis a singleLED.
annunciators (optional) are turned on by gating the
Function signals.Each annunciatoris a singleLED.

466. 0hmmeter
Reference.

473. ScanGenerator.

+74. A relaxation oscillatoroperatingat approximately
l0 kHz providesthe clock signalfor the ScanGenerator.
The oscillator output drivesa 4-bit synchronouscounter.
The counter outputs are gated and fed back to resetthe
counter after every I 2th input cycle, thus providingthe
-1-ö

4 . 8 1 .L 0 G r C
C|RCU|TS.
4-82.Clock.
4-83. Figure 4-8 is a block diagram of the Clock and
Counter circuits. The basic timing for the 3490A Ilgic

SectionIV

Model3490A

CLOCK

DATA
COUNTER

BUFFERS

EMITTER
FOLLOWER

TIMING
COUNTER
L T CI
HJC 2
H T C4
HTC8
HTC 16
H T C3 2

D C B A
T O D I S P L A YA N D
DATA OUIPUT

O S C I L L A T O RF R E O U E N C Y
FOR

STATE CLOCK

6OHz LINE
50Hz LINE

4MHz
3.333MH2

Figure4-8. Block Diagram,Clock and Counters.
is derived from a Clock Oscillator which drivesthe Data
Counter, a Timing Counter, and the State Clock. The
Clock Oscillator is a crystal-controlled multivibrator.
The oscillator frequency is 4 MtIz in instruments designedfor 60 Hz line operation, and 3.333 MHz in units
for 50 Hz operation. The oscillator output is divided by
two before beingappliedto the Data Counter.

484. DataGounter.
4{5. The Data Counter is a hexdecadecounter containing six decade counters, six 4line latches, and
output multiplexing. At the end of rundown, a Transfer
pulse from the Transfer and Zero Detect logic transfers
the count information in BCD form into the 4-line
latches. Scansignalsfrom the Dsplay assemblycausethe
BCD count information to be transferred to the Display
digit by digit, beginning with the least significant digit.
The Data Counter accumulates clock pulses continuously until a Clear Data Counter signal is received from
the logic Output Decoder.

486. Buffers

NEXT.STATE
FUNCTION
INPUTS

COMBINATIONAL
LOGIC
(GATES,RoM, etc.I

4€7. Inputs to the buffer amplifiersare two intermediate outputs from the Data Counter, Divide by 10,000
and Divide by 100,000. The outputs of theseamplifiers
are gated by the Select Hundred Thousand Counts
signals,HSHC and LSHC, from Logic Storage.If HSHC
is HIGH and LSHC is LOW, the Divide by 100,000
output is selected,and if HSHC is LOW and LSHC is
HIGH, the Divide by 10,000 output is selected.The
Buffer output is applied through an emitter follower to
the Timing Counter.

4-88.TimingCounter.
4{9. The Timing Counterconsistsof a singleD flip-flop
and a 4-bit binary counter. Five binary square wave
sigrals are produced in addition to the Timing Counter
input signal. This input signal is not a symmetrical
$quarewave.but is HIGH for 9,000 (or 90,000) counts
and LOW for I ,000 (or 10,000)counts.Thesesix timing
signalsgö to the Qualifier Multiplexer, and are used to
control run-up time, overload point, sample rate delay,
and function delay.

PRESENT
STATE
COMBINATIONAL
OUTPUT
LOGIC

OUTPUTS

Figure4-9. Typical State MachineBlock Diagram.

+9

Model3490A

SectionIV

Y=YES
N=NO

RANGE SELEC.
DEl€AMINE
TED. IF AN INVALID BANGE
CONDITION
EXISTS, 34904
AUTOMATICALLY RANGES TO
N E A F E S TV A L I O R A N G E

r0,0m
!I

IACDC

IS 34904 AEADY
TO TAKE A
R E A D IN G '

IS DELAY
REOUIRED)

BECHECK NANGE CON
OITIONS SEFORE TAK
INGMEASUREMENT.

FLAG IS SET
SEN
34904
WILL
NOI
B€SPOND TO MANUAL
OR EXTERNAL TRIG
6ER.

IF AUIORANC€ IS SEL€CT€O
ANO REAOING IS ON WRONG
RANGE,349OA BANG€S ANO
TAKES ANOTHEF READING.
THIS PROCESS IS REPEATED
UNTIL RANGEIS CORsECT

R€ADING IS
COMPLET€D

y9c'c-35a5

Figure4-10. Block Diagram,Main Logic ASM Flow Chart.

+10

Section IV

Model3490A
tl-90.Algorithmic
StateMachine.
4-91. T\e 3490A main logic circuits employ a logic
svstem called an Algorithmic State Machine (ASM)'
diagram'
Fizure 4-9 shows a typical State Machine block
"state"
nir nSU outputs are determined by the"present of the
state'"
machine at a given instant, called the
one or
with
state,
along
present
the
in
Certain outputs
"qualifier" inputs, determine the "next state" of
more
the ASIr{. For example, if the qualifier input is a certain
timing signal, the Next State Function logic may wait
until this qualifier reaches a predetermined level to
changethe state of the ASM. Each new state provides a
different combination of outputs.
492. Figore 4-10 is a block diagram of the main logic
ASM flow chart. This chart illustrates the process
followed by the ASM in taking a normal measurement'
Note that at many points, the path taken dependson the
condition of a certain signal. This signal is the qualifier
input to the ASM at that particular time.
4-93. State Clock. The input to the State Clock is the
4MlIz (or 3.333 MHz) output from the Clock Oscillator
(Figure 4-8). This signal is divided by a 4-bit binary
counter and a D flip-flop, so that the State Clock output
has a period of 8 prs(or 9.6 ps). The two State Clock
outputs, labeled HSCK and LSCK, are 180" out of
phase, and are used for alternate synchronous clocking
of input signals to the ASM storage. The State Clock
output is also used in the Data Output and Remote
Control circuits.
4-94. Read Only Memory. Figure +11 is a block
diagram of the Main Ingic Circuits. The 3490A logic
usesa Read Only Memory. Sevenof the memory inputs

in the "present" state are used,alongwith a "Qualifier',
input, to determine the next state. Five other memory
outputs are used to select the qualifier, as well as to
initiate the other logic action. In addition, the Read
Only Memory (ROM) also supplies an Output Enable
sipal to the Logic Output Decoder, a Memory Output
sigrralto the Logic Storageflip-flops, Transfer Enable to
the Transfer utd Zero Detect gates, and a Close
Electronic Switch signalto the Integrator.
4-95. Present State Storage. The Present State Storage
consists of seven D flip-flops. The next state outputs
from the ROM are clocked into the flip-flops by the
State Clock L signal. The D flip-flop outputs are the
present state. Together with the qualifier input, they
determine the next state outputs of the ROM. The
qualifier input is clocked into memory storage at the
ROM input by the State Clock H signal 4 ps later to
preventuncertainty in the ROM next state decision.
4-96. State ldentification. Each state may be identified
by a three-digitoctal coded number determinedby the
levelsof D flip-flop outputs YMA through YMG, shown
in Figure 7-30. For example, in state 000, all seven
outputs are LOW ("0"). If only YMA goesHIGH ("1"),
the state is then 001. In the state where YMG= l;
YMF=0; YME=l; YMD=1; YMC=l; YMB=l;
YMA = I (l 0l 1 I l1), the stateidentihcation number is
131. A total decimal number of 128 statesare possible,
with the higheststate identification number being 1774-97. Oualifier Multiplexer. A block diagram of the
Qualifier Multiplexer is shown in Figure 4-12. Qualifier
Enable signalsLMQA, LMQS, and LMQC from the ROM
are inverted and used to selectone output out of eight

Figure4-11. Block Diagram,Main LogicCircuits.

4-l r

SectionIV

Model3490A
remains HIGH until after Zerc Detect on the correct
range. After going LOW, End of ReadinggoesHIGH at
the end of the measurementsequence.The HIGH to
LOW transition signalsto the Data Output circuits that
the information stored in the Data Counter is valid and
allows the data to be transferredacrossguardbefore the
"busy' to "ready."
Data Flag goesfrom

ENAELE
IN P U T S

ENABLE

OUALIFIERINPUT
TO ROM

Figure4-12. Block Diagram,QualifierMultiplexer.
input signalsto eachof three 3-to-8line decoders.These
three outputs are applied simultaneously to the AND/
OR Invert Gate. The other two Qualifier Enablesigrals,
I-il,IQD and LMQE, are inverted and both HIGH and
LOW true signalsare usedat the AND/OR Invert Gateto
select one of the three decoder outputs. The output
from the Invert Gate is applied to a D flip-flop, which is
clocked by State Clock signal HSCK, and whose output
is the Qualifier Input to the ROM. This clock signal is
180" out of phasewith State Clock LSCKwhich clocks
the Present State Storageflip-flops. This preventsuncertainty in the ROM next statedecision.
4-98. Logic Output Decoder. This 4-to-l6line decoder
uses four inverted enablesignalsfrom ROM, HMQA-D,
to select the proper output. In addition, the Output
Enable signal from the ROM, and the State Clock signal
LSCK must both be LOW to obtain an output from the."
decoder. All outputs from this decoder are LOW true,
and are used to clock the Logic Storage flip-flops, to
clear certain storage flip-flops, to clear the Data and
Timing Counters,to operatethe RangeCounter, and to
clock the'Polarity and Overloadstorageflip-flops.
4-99. Logic Storage. The input level to the D inputs of
the six Logic Storage flip-flops is determined by the
inverted Memory Output signal from the ROM. Each
flip-flop is clocked to changeits output at a different
time (or times) during the measurementsequence.
4-100. Main Timing Flip-Flops. ThreeMain Timing Bits
are producedby Logic Storageflip-flops. All of theseare
used in controlling the DC Switching Logic, which
determinesinputs to and gainof the DC Amplifier. Main
Timing Bit A is also used to drive the sample rate
indicator. When Main Timing Bit B is LOW, it activates
the Auto Zero circuits in the DC Amplifier and
Integrator.
tl-101. End of ReadingFlip-Flop. The output of this
tlip-t1op is normally HIGH, and goesLOW shortly after
the Zero Detect of a measurement.If the instrument is
Ln the autorange mode, the End of Reading sigral

4-1O2. Data Flag Flip-Flop. The Data Flag output from
this flip-flop goes LOW at the beginning of a measurement and remains LOW until the reading cycle is
completed. If autorangeis selected,Data Flag remains
LOW until a readinghas beenmadeon the correct range.
This signal is inverted in both the Data Output and
Remotecircuits.
4-103. Select Divide by 100,000 Flip-Flop. The two
outputs from this flip-flop are used to select either the
divide by 100,000 or divide by 10,000 counts output
from the Data Counter to the Timing Counter.
4-104. Turn-On Clear. The output of the Turn-On Clear
circuit is LOW for approximately 100 ms after the
instrument is tumed on. This LOW signalclearsthe Main
Timing B and C flipflops and the Present State Storage
flip-flops, to force the logic into the preferred state
when the instrument is first turned on.

4-105.InputPolarity
Storage.
4-106. The input to this D flip-flop is the inverted
output of the Analog Zero Detect Amplifier in the
lntegrator circuits. The flip-flop is clockedat the end of
run-up. If the 34904 input is positive, the flip-flop D
input will be LOW at the end of run-up, and HIGH if the
input is negative.Both outputs areusedin the logic Zero
Detect circuits. The output which goes to the Display
and the DC Switching LoSc is HIGH for + input and
LOW for - input.

4-107.Transfer
andZeroDetect.
4108. The Transfer and Zerc Detectcircuits are shown
in the upper right hand corner of Figure 7-30. Two
outputs are derived from these circuits; a LOW true
Transfer signal, and a HIGH trve Zerc Detect sigtal.
These signals may be issuedat end of run-down (when
Integrator output reacheszerc), at overload if reading is
greater than 120 % of nnge, or when a False Transfer
signal is given during Logic Test. Transfer goes to the
Data Counter to transfer the count into the six quad
latch circuits in the countet.Zero Detect is one input to
the Qualifier Multiplexer, indicating to the ROM that a
measurementhasbeencomPleted.
4-109. Overload. A Transfer Enable signal from the
ROM goesHIGH at the start of run-down, and remains
HIGH until after the Transfer sigral goes LOW. This
enable signal is applied to one input of each of three
AND gatesin the AND/OR Invert Gate. The other input
to the two-input AND gate is connectedto the Time

SectionIV

Model3490A
Count 32 line from the Timing Counter. This line goes
HIGH at the overload point, 120 7oof runge.The output
from this AND gate then goesHIGH to produce Transfer
and Zero Detect commands.

output will be LOW. If Time Count 32 is HIGH,
indicating a measurementof greater thm 120% of
range,the flip-flop output will be HIGH. T[ris output
goesto the Data Output circuits (Option 021), and to
the Display.A HIGH Overloadsigral is invertedin the
Displaycircuitsto turn on the Overloadannunciator.

4-110. NegativeInput. If the 34904 input is negative,
the Polarity Storage Q output to the next AND gate will
be HIGH. Since Transfer Enable is already HIGH, when
Analog Zerc Detecr goes HIGH at the end of run-down,
Transfer andZero Detect commands are given.

+il5. DCSWTTCH|NG
LoGrC.
4-1 16. The DC Switching Logc uses range, function,
and polarity information, together with the three main
Time Bits to control all inputs to the DC Amplifier
during both run-up and run-down. This includes input
protection on the two lower dc Ranges,input attenuation on the two higher dc ranges,and the output ofthe
AC Converter in ac measurements.The DC Amplifier
gain is also selected by the DC Switching Logic. In
addition, this circuit also enables the Ohms Converter
during resistance measurements,and controls the reed
relay at the input to the AC Converter for ac measurements. A ,Read Only Memory and three dual-input
NAND gatesmake up the DC Switching Logic.

+111. Positive Input. When Jhe 3490A input is positive, the Polarity Storage Q output to the other
three-input AND gate is positive. Again, Transfer Enable
is HIGH, so when Analog Zero Detect goesLOW at end
of rundown, this signal is inverted and applied to the
third input of the AND gate, resulting in Transfer and
ZercDetect commands.
4-112. False Transfer. One input of a two-input AND
gate is connected to f 5 V, enabling the other input to
control the output. When False Transfer goes LOW
during Logic Test operation, Transfer and Zero Detect
commandsare issued.

+ I I 7 . R E F E R E NSCUEP P L I E S .

4113. Ovedoad
Storage.

ll.l 18. Voltage
Mea$rements.

+114. When a Zero Detect command is issued, the
Overload Storage D flipflop is LOW, indicating the
measurement is less than l2OVo of range, the flip-flop

4-119. Figure 4-13 is a simplified diagram of the
Reference and Ratio circuits. An accurate and stable
+ l0 V Referencefrom a voltage regulatedpower supply

R E F E R E N CPEO L A R I T YL O G I C

E X T E R N A LR E F E R E N C E
AMPLIFIER

(oPTtoN 080)
I N P U TP O L A R I T Y

(oPTloN o80)
EXT REF
INPUT

R A T I OP O L A R I T Y

EXT
INT

,rtl

+REF
sENsE

I

+REFERENCE
SUPPLY

a L L J U M P E R_S< * - b _ R E M o v E ot F
R A T I OO P T I O N
IS INSTALLEO.

I

3490-8-2930

Figurez1-13.Simplified Diagram,Referenceand Ratio Circuits.

+13

SectionIV

Model 3490A

circuit fumishes the positive reference which is used in
negative dc voltage measurements.A feedback circuit
which sensesthe reference voltage at the FET switch
input to the DC Amplifier ensuresthe correct voltage at
that point, even though there may be switch and
connector contact resistancein the circuit. The input to
the Inverting Amplifier, which supplies the - Reference,
is alsoconnectedto the sensepoint.
4-120. Plus Reference.The differentialamplifier of this
supply is referenced to a zener diode which is in the
emitter circuit of a feedback amplifier transistor. The
diode and transistor are in the same package, for
improved temperature stability. The amplifier gain is
adjustedto providean accurate+ l0 V output.
4-121. Minus Reference.The - reference,usedin ac and
positive dc measurements,is supplied by an inverting
amplifier whose input is the + 10 V reference.The gain
of this amplifier is adjustedto providean accurate- l0 V
output.

(0ption080).
4-122.RatioMeasrements
4-123. A 34904 equipped with Option 080 is capable
of making dc-to-dcand ac-to-dcratio measurements.
The
External ReferenceAmplifier has a gain of l0 when the
Ratio switch is set to the I V range.This is necessaryto
make the external referencecompatiblewith the reference switching logic, since in voltage measurements*
and - l0 V referencesare used. Figure 4-14 is a simplified diagramof the external referenceamplifier circuits.
4-124. Extetnal Reference Amplifier. A microcircuit
operational amplifier, connected in the non-inverting

mode, is used as a buffer amplifier for the external
referenceinput. The gain of this amplifier is selectedby
adjustingthe output of the FeedbackAmplifier. A third
microcircuit amplifier provides current to compensate
for bias current drawn by the input amplifier. The
External Reference Amplifier input is clamped to
approximately ! 14 V to protect againstexcessive
input
voltage up to + 250 V. Greater input voltages may
damage either the protection circuit or the Reference
Amplifier. The amplifier output is limited to approximately t 14 V for the protection of subsequentcircuits.
4-125. FeedbackAmplifier. An amplifier is used in the
feedback circuit so that the External ReferenceAmplifier gain on the 10 V Ext. Ref. range can be adjusted
slightly above or below unity as required. On the I V
Ext. Ref. range, the feedback is attenuated to give the
Reference Amplifier a gain of 10, becausein ratio
measurements,
this referenceis substitutedfor the l0 V
intemal reference.
4-126. Input CompensationAmplifier. Bias current at
the input of the External Reference Amplifier could
causean offset voltagedrop acrossthe input protection
resistorif this current were not compensatedfor by the
Input CompensationAmplifier. Figure 4-15 showshow
this is accomplished.The External ReferenceAmplifier
maintains both its inputs at approximately the same
voltage, so that the voltage at the inverting (feedback)
input is essentially equal to the External Reference
input. This voltage is connected to the non-inverting
input of the input CompensationAmplifier, U2, which
has a gain of l. The output of U2, then, is essentially
equal to the External Referenceinput voltage, and may
be r 0.1 V to + 12 V. The amplifier offset is adjusted

INPUT
PROTECTION
+ I7V

EXTERNAL
REFERENCE
AMPLIFIER

INPUT
COMPENSATION
AMPLIFIER

Figure4-14. Simplified Diagram,External ReferenceCircuits.

SectionIV

Model3490A
EXTERML
REFERENCE
AMPLIFIER
B I A S C U R R E N T+

EXT REF
INPUT

976K

AT
VOLTAGE
AMPINPUTS

FEEDBACK
AMPLIFIER

APPROX EQUAL

tI

TO+REF FET
A?U?F

+ l7v

COMPENSATING
CURRENT

90K
toK

VOLTAGE= INPUT VOLTAGE

34904- B - 3044

INPUT
COMPENSATION
AMPLIFIER
Figure4-15. Input BiasCompensation.

with the Bias Adjustment so that the compensating
current is equal to the bias current at the External
ReferenceAmplifier inPut.

for acldc ratio measurements. Table 4-2 shows the
referencepolarity required for the variouscombinations
of input and referencevoltages.

4-127. ReferencePolarity Logic. In the dual-slopeintegration method of measurement,the polarity of the
reference voltage used for run-down (integrator dis
charge) must be opposite the polarity of the input
voltage. The 3490A automatically selects the correct
reference polarity whether the External Referenceinput
is positive or negative. Since the external reference
voltage in ratio measurements replaces the positive
internal reference, the logic signal which selects the
rundown reference polarity must be inverted when the
extemal reference is negative. Figure 4-16 shows how
this is accomplished.The External ReferenceAmplifier
output is inverted and applied to one input of an
Exclusive OR Gate. The other input of this gate is
connected to the stored Input Polarity signal from the
I"ogic circuits. The Exclusive OR Gate output is HIGH if
one and only one input is HIGH. If both inputs are
either HIGH or LOW, the output is LOW. Becausethe
output of the AC Converter is positive, a negative
reference is selected in all ac measurements.The front
panel display polarity symbol is + if the input signaland
extemal reference are of the samepolarity, and - if they
are of opposite polarity. No polarity symbol is displayed

L1VITCHING.
T A N ES
+ 1 2 8 .F B O N P
4-129. Range, Function, and Sample Rate delay are
controlled by HIGH true BCD logic signals from the
front panel switches.HOLD and MAN Trigger signalsare
LOW true. If the 3490A has a Remote Control option,
Range and Function information are routed through the
Remote Control circuits so that, if desired, these
operationsmay be controlled remotely. Unless Autorangeis selected,the Rangeinformation is stored by the
RangeCounter in the Logic circuits.

SUPPLIES.
4130.POWER
4-131. Figure 4-17 is a block diagramof the inguard
power supplies.Regulatedsuppliesof t 30 V, t 17 V,
'änd t 5 V provide power to the inguard circuits of the
" 3490A. An outguard + 5 V supply is a part of Options
O2O,O2l andO22. The + 17V supply is regulatedby a
microcircuit regulator, and its output is accurately
adjusted. All the other inguard regulator circuits depend
directly or indirectly upon the + l7 V supply, as
indicatedin the block diagramof Figure4-17, since+ l7

INVERTING
AMPLIFIER
+ F O R+ E X T E R N A LR E F .
. F O R . E X T E R N A LR E F .
+ F O R I N T E R N A LR E F .

L O WF O R + E X T E R N A LR E F .
H I G HF O R. E X T E R N A LR E F .
L O WF O R I N T E R N A LR E F .
RATIO POLARITY
(SEETABLE 4-1)

,

I
H t G H F O R+ t N p U T
L O WF O R . I N P U T
H I G HF O RA C I N P U T

Figure4-16. ReferencePolarity Logic.

+t5

Model3490A

SectionIV
Table4-2. Polarity in Ratio Measurements.
Measurement Run-down
External
Reference
I nput

Input
Signal

+
+
+

Ratio
Polarity
Signal

Displayed
Polarity

HIGH
LOW
LOW
HIGH
HIGH
LOW

+

volts is used as a reference for the + 30 V, + 5 V and
- 17V regulators.The -30V regulatoruses- 17V as a
reference.Ul02 in the - 17 V supplyis operatedoff raw
supply thru CR123 until the -30V supply comesup
after turn-on. It is then operatedoff - 30 V thru CRl22.
The - 5 V supply is zener regulatedfrom the - l7V
supply. All suppliesexcept the - 5 V supply are voltage
regulatedand current limited for protection. The output
of each supply is limited by a zenerdiode to protect the
circuits it supplies.

Reference
Required

Amplifier
Output Used

Invert. Amp.
Ext. Ref. Amp.
Ext. Ref. Amp.
Invert.Amp.
Invert. Amp.
Ext. Ref. Amp.

+
none
none

Table4-3. Analog Tests.
Run-Up
T€sl
No.

DC Amp.
Input

2

Ground
+ Ref/- Ref
+ Ref
Ground
Input x 0.01
o Ref

J

4
5
6
7

Run-Down
DC Amp.
Gain
x
x
x
x
x
x

1
l
l
10O
100
10

DC Amp.
I nput
+ Ref/- Ref
- Ref/+ Ref
Input x 1
+ Ref/- Ref
+ Ref
+ Ref

DC Amp.
Gain
x
x
x
x
x
x

1
l
l
l
1
1

+ I 3 2 . S E L F . T EF
SU
TNCTION.

4-134.LogicTest,No.l.

+133. Seven tests, which may be selectedby front
panel switch settings or by optional remote control,
provide internal checkson the operationof many of the
3490A circuits. Test No. I checksapproximately70%
of the logic circuits, and the other six check analog
circuits as explainedin the following paragraphsand in
Table4-3.

4-135. A seriesof ten readings,shown below, provide
visible indication as to whether the display and certain
logic circuits are operating correctly. Note that the
instrument autorangesone stepfor eachreading,upranging through all ranges, then downranging through all
ranges.Note also that the numerical display changesfor
each range. In logic test, two factors determine the

FULL- WAVE
R E C TFI I E R
cRil9 - t 20

R E C TI F I E R

REF
REGULATOR

Figure4-17. PowerSupply Block Diagram.
+lb,

Model3490A

SectionIV

numerical display; the length of time that the Data
Counter is allowed to count, and the Data Counter
output to the Timing Counter (divide by 10,000 or
divide by 100,000 counts). In each range, one of six
Timing Counter outputs determines the length of the
count, and consequently,the most significantdigit. The
position of the most significant digit is the result of the
Data Counter output selected.If Main Timing Bit B is
HIGH, the divideby 100,000output is selected,and if B
is LOW, the divide by 10,000 output is used. If Main
Timing Bit C is HIGH, the instrument upranges,and if C
is LOW, it downranges.Both timing bits are set HIGH
when the instrument reachesthe lowest range, and set
LOW when the highest rangeis reached.
+ 080.024
+ O4.0024
+ o.2N24
+.010024
+ 0.09032
+ t0.oo24
+ 200.024
+ 4000.24
+ 80002.4
+ 6000.xx OL

4141.+ Reference
Check,
TestNo.4.
4-142.Tlnslestcompares
thevoltage
at the+ RefFET
switch (F in Figure 44) Io a preciseinput voltage. The
voltage through the + Ref FET is used for run-up, and
the input voltage is used for run-down. If the instrument
doesnot have the ratio option, or if the RATIO switch is
set to INT REF, this checks the internal + Reference
voltage. With the RATIO switch set to EXT and the
EXT REF input terminals shorted, Test No. 4 can be
used in adjusting the External ReferenceAmplifier zero
for both the I V and l0 V referenceranges.

+143.0.1V Range
Zero,TestNo.b.
4-144. The 0.1 V Range is simulated for this test by
setting the DC Amplifier gain at x 100 for run-up, and
using the normal reference voltages for run-down. The
amplifier input is grounded through the Input Short
FET during run-up, and either the + or - Referenceis
used for run-down as in a normal voltagemeasurement.
Test No. 5 checksoperation of the auto zero circuits in
the DC Amplifier.

4145.x .01Atten.,x 100Gain,
TestNo.6.

4-136. During the last measurementlisted above, the
Transfer signal is switched on for 8 counts and off for 8
counts during the entire counting period, which lastsfor
1,600,000 + counts. Becauseof the counting frequency,
nearly all dots in the display appear to be on during this
period. The I (in 1,600,000)is lost becausethe display
does not provide a seventh digit. In all except the last
reading, the two least significant digits are predictable
becauseof known transition times during the reading.

4146. In Test No. 6, a precise- l0 V input voltage is
first divided by 100 in the attenuator,then amplified by
100 in the DC Amplifier. The + Referenceis used for
run-down as in a normal measurement.An incorrect
readingin this test could indicate error in the attenuation, the DC Amplifier gain adjustment, or a thermal
offset. Test No. 6 is used in the Adjustmentprocedures
for adjustingthe x 100 gain.

+137. 10V Range
Zero,Test
No.2.

4147. 0hmsReference,
TestNo.7.

4.138. Test No. 2 selectsa DC Amplifier gain of I for
both run-up and run-down, which is the l0 V range
configuration. During run-up, the amplifier input 1s
grounded through the Input Short FET switch (C in
Figure 44). Either the + or - Reference is used for
run-down just as in a normal dc measurementwith zero
input. If the amplifier and its auto zero circuits are
operating correctly, the display should be zero.

,l-148. In Test No. 7, the signalat the Q Ref FET switch
(G in Figure44) is amplifiedby l0 and comparedto the
Ref. The A Signal input terminals must be
.tlOv
shorted to close the feedback loop of the e cunent
source amplifier, thus generating the Referencevoltage
acrossthe referenceresistor(seeFigure 4-7). Becausea
precise voltage is not required for the fl Reference, the
tolerance for this test reading is I 7000 counts. A
correct readingverifies proper operation of most of the
OhmsConvertercircuits.

4139. Turnover
Error,TestNo.3.
4-140. Test No. 3 checks for turnover errors, such as
differences in value between the + and - Reference
voltages, or amplifier offsets which result in differences
between positive and negative readings with inputs of
the same absolute value. For this tesi, the instrument
usesthe + Ref for run-up and the - Ref for run_downin
one measurement, and _ Ref for run_up and + Ref for
run-down in the following measuremänt. The stored
pola.rity of the run-up voltage in one measurementis
used to selectthe run-up voltageof the oppositepolarity
for the next measurement.ti tne RAiustmenf proce_
dures,after the + Referencehas beenadjusted,Test No.
3 is usedto adjustthe - Reference.

+149.BCDREMOTE
EXPAND
0PTt0N020(Figure

7-3r).

4150. 0utguard
Power
Supply.
4-151. A microcircuit regulator supplies a voltage of
approximately + 5.3 V to the outguard Data Output,
Remote, Trigger and Sample/Hold Trigger circuits. This
voltage is shown on the schematic diagrams as + 5 VI,
and is isolated from all inguard circuits. The outguard
groundis alsoisolatedfrom the inguardcommon circuits
and from chassis(earth) ground, and may be floated a
maximum of 40 V abovechassissround.

+17

Model34904

SectionIV
4-152. lsolatedTriggerand Hold.

S E O U E N T I A LL O G I CI N P U T S
ENOOF REAOING
L

4-153. External Encode and Hold are both LOW true
signals. They are inverted and applied through emitter
followers to photo-isolators, consisting of a lightemitting diode which drives a photosensitive transistor.
Consequently,there is no electricalconnectionbetween
outguard and inguard circuits.

SCANC H
SCAN 8 H

SCAN

A H

l

l

t

l

t

t

l

l

t

r

courPurslI i I i i I I

It-l54. Sample/Hold
Trigger
Circuits.
4-155. Sample/HoldTrigger. Whenthis input goesfrom
HIGH to LOW for a pulse width of at least 30
nanoseconds,it signalsthe Sample/Holdcircuits (Option
"hold". This pulse is inverted twice and applied
040) to
to an isolation transformer, which couples the trigger
sigral to the inguard Sample/Hold circuits. The Sample/
Hold Trigger input connection is direct coupled, and if
the connection(rearpanel J7 pin 9) is left open,+ 5 V is
present at that pin. This trigger will not initiate a reading
unless the Stretched Pulse Output is connectedexternally to External Encode.
4-156. AC Trigger. This input may be any pulse having
a negative-goingleading edge of 2 to 15 volts and a
width of at least 30 nanoseconds.This pulse is capacitively coupled to the isolation transformer to trigger the
Sample/Holdcircuits.
zt-157. StretchedPulseOut. This output changes from
HIGH to LOW for at least 240 microsecondsfor each
Sample/Hold or AC Trigger input. StretchedPulseOut
may be connected to External Encode to initiate a
measurementsimultaneouslywith the Sample/Holdtrigger.

+ 1 5 8 .D A T AO U T P UOTP T I O0N2 1 .
4-159. The Data Output connectionsat the rear panel
are isolated from the internal circuits of the 3490^.
Power for the outguard circuits is supplied by the
outguard + 5 V power supply. Outguard ground is
isolatedfrom inguardcircuit common and chassis(earth)
ground, and may be floated up to 40 V abovechassis.
Figure 7-32 is a diagramof the Data Output circuits.

4-160.DataMultiplexers.
4-161. Three multiplexers,eachhaving8 input linesand
4 output lines, are used to transfer the Data Output
information across the guard to four eight-bit shift
registers.An "output select" (Ss) connection to each
multiplexer selectsone set of four inputs if the Ss input
is HIGH. and the other set of four inputs if Se is LOW.
The outputs from two multiplexers are applied to the
inputs of the third, or "master" multiplexer. The
outputs of the mastermultiplexer are enabledfor only
the eights periods of time necessaryto transferall the
Data Output information, as shown in Figure 4-18. The
SequentialLogic determinesthe time and sequenceof
mlolTnationtransfer.
:-l !

MASTER MULTIPLEXER
OUTPUT SELECT

I
I I
OI

IIULTIPL€XEROUTPUT I
I
ENAELE L
I
l
l

DATA MULTIPLEXE
OUTPUTS
OATA CLOCK
IO OUTGUARO
SHIFT REGISTERS

l

r

l
l

lI L l -E -X 1r - t1 .9 .

l
l

|

t

n

l

l

n
I
I

n

l

n

| dild

I F

i i 1 6 i 9 ' i3
i " r i 9 8 ä i ä ;i

r r i r z t n : l l a
l

n

t

n

o,,oo,o outou, i.lormorion tcl.r.d
oc.cr ry'd ddihq rhi. e.riod d iß

n

n
I
i

Figure4-18. Data Output Timing Diagram(Option 021).

Logic.
4-162.DataOutputSequential
zt-163. Figure 4-18 shows the timing sequenceof the
sequential Logic inputs and outputs. The Logic is
enabled when the End of Reading signal goes LOW at
the completion of a measurement.The three scansignals
which control the outputs from the Data Counter
operate the Logic to correlate the multiplexer outputs
with the outputs from the Data Counter. The Sequential
Logic consists basically of three JK flipflops. The scan
signal inputs to the flip-flops are gated to obtain the
desiredoutput pattem.
4164. OataClock.
+165. A Frequency Doubler is used so that a clock
pulse is issued for each transition of the Scan A signal.
Thesepulses are delayed slightly before being applied to
the outguard Shift Registers, to allow time for the
multiplexer outputs to reachthe proper state.

Asembly.
4166. lsolation
arl67. Each signalis transferredacrossguard through a
photoisolator, which consists of a light+mitting diode
driving a photosensitivetransistor. Consequently, no
electrical connection is made between the inguard and
outguard circuits.

+168. ShiftRegisters.
4-169. Four 8-bit Shift Registersareused,providing the
capability of 32 paralleloutput lines. Each time a Data
Clock pulse is received, the information in the shift
registershifts one position and a new input is accepted.
A dual-input Exclusive OR gate in each of the shift
registerinput lines determineswhether the coded Data
Output information is HIGH true or LOW true. The
operation of thesegatesis suchthat if one and only one
input is HIGH the output is HIGH. If both inputs are

Model 34904
either HIGH or LOW, the output is LOW. The HIGH/
LOW switch on the Outguard Data Output Assembly
controls one input to each gate. When the HIGH/LOW
switch is set to HIGH, one input to each gate is always
LOW; consequently, the output will be the same logic
level as the other input. When the switch is set to LOW,
one gate input is always HIGH. Consequently, if the
other input is also HIGH, the output will be LOW, and if
the input is LOW, the output will be HIGH.
4170. Data Flag.
+171. The Data Flag output signal goes HIGH at the
begiruring of a measurement and LOW after a reading
sequence is completed. The HIGH to LOW transition
indicates that the Data Output information is ready.
This transition constitutes a Print Command to a digital
recorder. If the instrument is operating in the autorange
mode, Data Flag remains HIGH until a reading on the
correct rangehas been completed.

SectionIV
gates,and a HIGH signal at one input of the other gate.
The Remote Enable signal is gated so that the fwa[
Remote Flip-Flop cannot be changed while remote
program information is being transferred acrossguard.

4180. 0utguard
Multiplexer.
4181. This dual 4-to-1 line multiplexer acceptsg bits of
range and function information. Then, when a progam
Execute command is given, this information is transferred serially, two bits at a time, to the two inguard
Shift Registers.The Scan A signal is used to selecl the
multiplexer outputs. ftan A is applied to one output
selectionline, and Scan A divided by 2 is appliedtoihe
other line. Figure 4-19 shows the multiplexer output
sequence.
S E O U E N T I A L O G I CI N P U T S
PROGRAM
EXECUTE H
scat{ c

L172. kinter Hold.
+173. A HIGH signalfrom a digital recorder,indicating
that the recorder is not ready for an input, is inverted
and connected to the 349OA Hold line. This prevents
automatic sampling until the Printer Hold signalreturns
to LOW. A slide switch on the Outguard Data Output
printed circuit board permits disabling of the printer
Hold line. If the switch is in the IN position and the
Printer Hold line is left open, the inverting transistor
output may go LOW, resulting in a ..Hold" condition.

4t74. REM0TE
C0NTR0t
0PTtoN
022.
+175. The Remote Control Option permits remote
control of range, function, autorange selection, and
Sample/Hold operation. All connections at the rear
panel Remote Input connector are isolated from the
34g0{internal circuits. Power to the outguard circuits is
supplied by the + 5 V outguard power supply. Outguard ,r-.
ground is isolated from inguard circuit common and
from chassis(earth) ground, and may be floated up to
40 V above chassis. Figure 7-33 is a diagram of the
Remote Control circuits.

l}176.Gircuit
lsolation.
1.177. A photo-isolator, consisting of a light-emitting
diode which drives a photosensitivJtransistoi, is used to
carry each signalacrossguard.Consequently,there is no
electrical connection bätween inguärd and outguard
circuits.

4-178.Remore
Enable.
4-179. When the Remote Enable input is held LOW
continuously, this information is carrieä acrossthe guard
to the bcal/Remote FlipFlop. Control of the flif_flop
is provided by two NAND gates.A LOW Remote Enable
signal results in a LOW siglral to one input of
one of the

SEOUENTIALLOGIC -----_-I
OUTPUT
PROGRAMFLAG
OUTPUT

I
I
l

l

MULTIPLEXER
SELECT INPUTS

I

l

scaNA(So)

-

|

r---l

t

l

r

2Vamplitudeand
> 30 ns wide

t .:l

DC Null Voltmeter

VoltageRange: 100 mV ro lOO V

Adiustments
Tlou6leshooting

-hp- Model 419A DC Null
Voltmeter

Capacitor

Capacitance: 1.0 pF

Päiformance Checks

+rp-Part No. 0160-261I

Resistanc€s:
1 ka i 10%
lokf,} 10.1 %
1 M f , , r O . 17 0

Performance Checks

+rp-Part No:
0684-r02 l
06984157
0698.6369

Thermal Converters

Voltages:
1 V
3V

Performance Checks

+ r p -M o d e l1 ' l 0 5 1 A
+lp- Model 11O5OA

Square Wave Generator

F r e q u e n c y :1 0 0 H z t o 1 k H z
Output Level: 20 V p-p
R i s eT i m e : ( 5 0

PerformanceChecks
Adiustments
Troubleshooting

+ p - M o d e l3 3 1 0 A
Function Generator

Silicon Diode

(20 v piv

Performance Checks
Adiustments

+rp-Part No. 1901{040

Resistor

1 0k n

Performance Checks

+ | p -P a r tN o . 0 6 8 4 - 1 0 3 1

t E

Voltage: 20 vdcw

Resistors

Adlustments
C€lcu lator

G P I 8 u s C o n t r o lC a p a b i l i t v
Must serveas printer for
34904 output data

GPIB Ooerational Check
GPI B Troubleshooting

-hp- 9820A Calculator
with fip- 11144A ASCII Bus
I nterface and Perioheral
Control ll ROM Block

Logic Comparator

5-C,

Capable of in+ircuit check
of dual in line TTL lC packages

Troubleshooting

- h p -1 0 5 2 9 7
LogicProbe

Ä i

Section V

Model34904

S E C T I OVN
MAINTENAN
CE
5-r.T N T B0 D U CT Io N .

in the table may be substituted for the recommended
model.

5-2. This section contains performance tests and adjustment procedures for the Model 3490A Multimeter. The
performance tests determine whether your instrument is
operating within its published specifications.The adjustment proceduresare provided to help you maintain your
instrument within specification limits.

TESTEOUIPMENT.
5.3.RECOMMENDED
54. Test equipment required for the performance tests
and adjustment procedures is listed in Table 5-l . Any
equipment that satisfies the critical specifications given

5.5.TEST
RECOBD.
5-6. A PerformanceTest Record is provided at the end
of this section for the purpose ofrecording the results of
the Performance Tests. This record lists all of the tested
specifications and their acceptable limits. This record
can be removed from the manual and retained as a
permanentrecord of the incoming inspectionor routine
maintenance performed on the instrument. This record
may be reproduced for your use without specialpermission.

PERFORMANCE
CHECKS
S7. PERFORMANCE
TESTS.
5-8. Use the following test procedures to determine
whether your instrument is opefating within its published specifications. The test limits given in the accuracy tests and on the performance test record compare
the instrument to the 90-day specifications given in
Table l-l . However, if your accuracyrequirementsare
met by other specifications, such as the 30-day or
Gmonth specifications,the test limits should be adjusted
accordingly. The performance of the instrument should
be tested upon receipt and at regular intervals determined by your accuracyrequirements.Refer also to Mil.
Spec.MIL{45662A.If
the 3490A fails to meet one or
more of its specifications, refer to the Adjustment
Procedures,Paragraph5-51. The 3490A and test equipment should be operatedät normal line voltage with the
3490A rear panel line selector switches set as instructed
in Figure 2-1. Allow at least one hour warm-up time for
the 3490A before beginning the following tests.

$9. DCVOLTMETER
ACCURACY
TEST.
5-10. A dc voltagestandard(-hp- 7a0B) is required for
this test.

c. Select3490A rangesand dc standardpositive and
negative outputs listed in Table 5-2. Display should be
within limits shown in each case.

$ 1 1 .A CV O L T M E T E
AR
CCURACYTESTS.
5-l 2. Becauseof the voltagerangeand bandwidth of the
3490A ac voltmeter circuits, more than one test setup is
required to verify the accuracy specifications. The -hp
Model 745A/746A AC Calibrator may be usedto check
the accuracyof all rangesat frequenciesup.to I l0 kHz;
however, the accuracy of this sigral sourcealone in some
casesmay not be great enoughto ensurea valid test of
Table 5-2. DC Voltmeter Accuracy.
3490A
Range

a. Set 3490A FUNCTION to DC, RANGE to .l V.
b. Connect dc standardbetween INPUT HIGH and
LOW terminals.

Display Limits

.1V

r 0.010O0
V
r 0.05000V
r 0.10000
V

t .009995to .010OO5V
l .049990to .050010 V
t .099985to .100015 V

1 V

t o.10000
v
r 0.50000V
r 1.00000v

I 0.09997to O.10003V
I 0.49994 to 0.50006 V
r 0.99990to 1.0001OV

1 1.00000
V
i 10.0000
v

! 00.9997 to 01 .Oq)3 V
t 09.9990to 10.0010V

1 10.0000
V
r 100.000
V

t 009.997to 010.003 V
t 099.990to 10O.O10
V

I 100.000
v
i 500.000v
r+ 1000.00v

10099.97to 010O.O3
V
r 0499.92 to 0500.08 V
+ (x199.86
to 1000.14V

10v

Connect Guard to Input Low or damageto
the instrument may result.

DC Standard
Output

1 0 0v

1000v

* lf -hp- 7408 DC Standard is used, do not apply negative
voltage greater than - 500 V.

5-l

PERFORMANCE
CHECKS

Section V

the 3490A accuracy. In this case,a correction factor
chart should be used to adjust the calibrator output.
'745A1746A
Such a chart for the -hpmay be derived
during routine periodic calibration of the instrument,
and can be used to set the 745A controls for a precise
output. For example,if the 745A output is known to be
0.04% high at I V, 20H2, the 745A can be set for a
precise 1 V output. by setting the 745A voltage set
controls'to 1.000000V and adjustingthe error measurement control to +0.04%. The corrected voltage will
then be sufficiently accurate to test the 3490A at I V,
20H2. To determine the length of time that the
correction factor chart will be valid, refer to the latest
745A1746AOperatingand ServiceManuals.
t

.

5-13. To verify the ac voltageaccuracyof the 34904 at
frequencies above I l0 kHz, the ac to dc transfer
measurementtechnique may be employed. Using the
test setup shown in Figure 5-1, apply an accurate dc
voltage to the thermal converter and adjust the dc
differential voltmeter for a null indication. Remove the
dc input from the thermal converter and apply the ac
signal to both the thermal converter and the 349OA
input simultaneously.Adjust the test oscillator output
level to return the differential voltmeter to a null
indication. This results in an rms value of the ac signal
equal to the rms valueof the dc standardoutput.
5-14. Table 5-3 lists the voltage and frequency points
which should be checked to verify the ac voltage
accuracy of the 349OA, together with the test equipment neededfor eachcheck. If the equipment required
for some checks is not available,a good indication of
performancecan still be obtainedby checkingthe points
for which suitable equipment is available.
r-..

Model3490A

Connect Guard to Input Low or damage to
the instrument may result.

5 . 1 5O
. HMMETE
AR
CCURAC
TE
YSTS.
5-l6. Preferred
Method.
5-17. A resistancedecadewith settingsfrom 100Oto
10 MO is requiredfor this test. A correctionfactor chart
for the decade is necessary to achieve the accuracy
required to check the performance of the 34904
'Ohmmeter function. Select the 3490A ranges and
resistancedecade settings shown in Table 54. The
algebraicsum of the 34904 reading and the resistance
decadeerror indicated by the correction factor chart
should be within the limits given for each setting listed.
5-l 8. Alternate Method.
5-19. If a suitableresistancedecadewith an appropriate
correction factor chart is not available,resistorswithin
the valuesshown in Table 5-5, whosevalue is known to
within the tolerances given, may be used to check
performance of the 3490A ohmmeter function. The
3490A display should be within the number of counts
shownfrom the value of the resistorused.

5 . 2 0D
. CC O M M O N - M O
RD
E JEE C T I O
NS T .
TE
5-21. Effective common-moderejection is the ratio of
the peak common-modevoltageto the resultanterror in

MULTIMETER
hp 34904

t-,,,-----l
( O ) @ u
o
@\:d

o-o

o

@

o

o

@

oo

DC OIFFERENTIAL
V O L T M E T E/R R A T I O M E T E R
hp 542O8

OUTPUT
CAELE

Figure5-1. AC VoltmeterHigh FrequencyAccuracyTest.

PERFOBMANCE
CHECKS

Model34904

Section V

Table 5-3. AC Voltmeter AccuracY.
3490A
Range

Test Sisnal
voltago

Frequency

3490A Max
DisplayError

Test Signal
Source

AC Calibrator

1 V
1 V
1 V

1 V
1 V
1 V

2Q Hz
10kHz
100 kHz

t 400 counts
t 125 counts
r 125 counts

10v
10v
10v

1 V
5V
10v

100 kHz
2O kHz
2Q Hz

t 35 counts
t 75 counts
t 40Ocounts

10v
1 0 0v

100 Hz
50 kHz

t 35 counts
t 125 counts

1 Ok H z
1 0 0H z

t 135 counts
r 125 counts

1 0 0v
1 0 0v
1000v
1000v

1000v
1 m 0v

1 V

1 V

25OkHz

* 810 counts

Test Oscillator

1 V Thermal
Converter
DC Differential
Voltmeter

10v

3V

25O kHz

t 285 counts

Test Oscillator

3 V Thernul
Converter
DC Differential
Voltmeter

Table 54. OhmmeterAccuracy.
39OA Rang
.1 ko
lkn
10 ks}
100 ko
1,Oq)ka
10,000ko

Other Equipment
Required

Docade Sotting

Display Limits

.099983to
0.99988to
09.9988to
099.988to
0!X,9.86to
09996.3to

100 sr
1ks}
10 kn
100ka
lMO
1 0M O

.100017
1.00012
10.OO12
1O0.012
1000.14
10003.7

with Guard connectedto High. A dc standard(-hp7zt0B)is requiredfor this test.
a. Connecta I kQ resistorbetweeninput High and
Low terminals,and connectHigh to Guardas shownin
Figure5-2.
b. Set 3490A FUNCTIONto DC. RANGEto I V.
Note 3490A display.

c. Connect dc standard between Higfr terminal and
the 3490A chassis.
d. Set dc standard output to + 500.00 V. 3490A
reading should not change more than 0.00005 V, verifying dc common-moderejection> 140 dB, where:
ECMR= 20log"

Peak common-modevoltage
Effect on reading (volts)

Table 5€. Alternate OhmmeterAccuracyTest.
Resistor

3490A
Range
.1 ko
1k:)
1 0k o
1OOko
1,000ko
10,000ks)

Value

90to110o
90Oto 1.1 ko
9koto11 ksl
90kOto110kO
90O ko to 1.1 Msl
gMf}to 11MO

Toleranca

t
r
t
r
r
r

Display
Tolerance

o.oo25% t
0.0025% t
O.OO25% t
0.0025% t
0.005% *
I
0.01%

17
12
12
12
14
37

counts
counts
counts
counts
counts
counts

D C S T A N D A R O/ D I F F E R E N T I A L
VOLTMETER
hp 74OB

eEo@oo
5490Ä -a - 29a!

OUTPUTCAELE
ho llO55B

Figure5-2. DC Gommon-ModeRejeaion Test.

5-3

PEBFORMANCE
CHECKS

Section V

5.22.ACCOMMON.MODE
REJECTION
TEST.

Model3490A

c. Set 3490A FUNCTION to DC. RANGE to l0 V.
short Input. Note 3490A reading.

5-23. An ac calibrator (hp- 7a5A) and an electronic
counter (-hp- 53004) are requiredfor this test.

d. Disconnect input shortandconnectcalibrator to
3490A input. Adjust calibrator amplifier to 7.07 Vrms
(10 V peak).

a. Connect a I kCl resistor between input High and
Iow terminals, and connect High to Guard as sfiown in
Figure 5-3.

e. 3490A reading should not vary more than
I 00.316 V from reading noted in step c. This verifies
normal-moderejection of )50 dB at 60 Hz (or 50 Hz),
where:

b. Connect electroniccounter to ac calibratoroutput
and adjust calibrator frequency to 60 Hz t O.l % if the
349OA is desigred for 60 Hz line operation, 50 Hz
! 0.1 % if it is a 50 Hz model.

NMR= 20los

c. Before connectingac calibrator output to 3490A,
set 3490A FLJNCTION to DC. RANGE to I V. Note
3490A reading.

Peakac superimposedvoltage
Effect on reading(volts)

5.26.DC VOLTMETER
INPUTRESISTANCE
TEST.
5-27. A dc standard(hp- 7a0B) and a I MA !O.l%
resistor(-hp- 0698-6369) arerequiredfor this test.

d. Connect ac calibrator to 3490A as indicated in
Figure 5-3 and set output voltageto 70.7 Vrms (100 V
peak).
e. 3490A reading should not change more than
0.00001 V from the readingnoted in step c, verifying ac
common-mode rejection of 2140 dB at the frequency
specified (50 Hz or 60 Hz), using the formula given in
Paragraph5-21.

Connect Guard to Input Low or domage to
the instrument may result.

a. Connect 3490A, dc standardand resistoras shown
in Figure5-5.

S24.ACNORMAL.MODE
REJECTION
TEST.
5-25. AC normal-moderejection is the ratio of the peak
normal-mode voltage to the resultant error in reading.
An ac calibrator (-hp- 7454) and an electronicCounter
(-hp- 5300A) are requiredfor this test.
,-..
a. Connect test equipment as shown in Figure 5-4.
Do not connect to 3490A input.

b. Set 3490A FUNCTION to DC, RANGE to lOV.
c. Connectjumper acrossI M,fl resistorasindicated.
Adjust dc standardoutput to 10.0000V. Note 3490A
reading.
i^

b- Using an electroniccounter as a monitor, adjustac
calibrator frequency for 60 Hz t 0.1 % if 3490A is
designedfor 60 Hz line operation,or 50.H2! O.1%if it
is a 50 Hz model.

-Remove
jumper from I MQ resistor.3490A readd.
ing should not changemore than 00.0010 V, verifying
input resistance
) l0 ro Q.
e. Set 3490A RANGE to 100 V. Reduceinput to

1.00000
v.

AC CALIERATOR
hp 7454

l0
i

D
@

O
@

0
@

0
@

0
@

0 00
@

ELECTRONIC
COUNTER
hp 53OO

MULTIMETER
hp 349O4

r-------l

1O
CONN€CTEO
C H A S S I SG R O U N O

e

o@

o

Figure5-3. AC Common-ModeRejectionTest.
< t

Q

I

t l r

+T-F++F

oo

U

CHECKS
PERFOBMANGE

Model3490A

Section V

AC CALIBRATOR
hp 7454

n

r

-

r

n

O

0

0

0

0

ä ö ö ö o o-rrr-rrr--r]

<)
ffi
L4

r-r-I-T-'l

oD

-T-1

a')

MULTIMETER
hD S49OA

o

o o o o ?

t".f?

e

ELECTRONIC
COUNTER
hp53OO

n
FI

\

5490-B-y50

Figure5-4. AC Normal-ModeReiectionTest.
f. Connect jumper across I MQ resistor and note
3490A reading.
g. Remove jumper. 3490A reading should change
between 000.908V and 000.910V. This verifies an
input resistanceof 10 MQ x O-15%.

INPUT
IMPEDANCE
TEST.
5-28.ACVOLTMETEH
5-29. A test oscillator (-hp 652A) and two precision
resistors, I MO t O.l % (-hp- 06984369) and l0 kQ
t 0.1 % (-hp-06984157),arc requiredfor this test.
a. Connect 3490A, test oscillator,and I Mfl resistor
(\)
as shown in Figure 5-6. Connect jumper across
resistor as indicated.
b. Set 349OAFUNCTION to AC, RANGE to I V.
c. Adjust test oscillator frequency to 25H2. Adjust
output amplitude to obtain a 3490A reading of
1.00000v.

d. Remove jumper from resistor Rs. 3490A display
shouldbe not lessthan 0.65975 V if the instrument does
not have the rear input connector, or not less than
0.65804 if it doeshavea rear input connectorin parallel
with the front input terminals.
e. Replace the l Mfl resistor (R5) with a l0k{-2
resistor.Connectjumper acrossresistor.
f. Adjust test oscillator frequency to 250 kHz. Adjust output amplitude for 3490A readingof 1.00000V.
g. Removejumper from lOkfl resistor.3490A display should be not less than O.492ll V if the 3490A
does not have rear input connector, or not less than
0.41321V if it doeshavethe rear input.

PERFORMANCE
$30. SAMPLE/HOLD
(0ption040/045).
--5-31. The dc voltage meursurementperformance of the
3490A must be within specification before proceeding

D C S T A N D A R DD/I F F E R E N T I A L
VOLTMETE
R
ho 74OB

3490A

B - 2948

M U L T IM E T E R
hp 349OA

O U T P U TC A B L E
hp llO558

Figure5-5. DC Voltmeter Input Resistance
Test.

5-5

PERFORMANCE
CHECKS

Section V

Model3490A

TEST OSCILLATOR
hp 652A
MU L T I M E T E R
hp 349OA

( o ) @ L ' e
,,'

\

\ /
@'\--O

l/-.----\l

@ - @ oo

34904-A-?947

Figure5-6. AC Voltmeter Input lmpedanceTest.
with the Sample/Hold performance tests. Refer to
Paragraph5-9.
$32. Sample/HoldBC Mea$rement AecuracyTest.
5-33. A dc standard (-hp- 7a0B) is required for this
procedure, which checks the dc voltage accuracy of the
Sample/Hold circuits to the 90-day specification in both
Track/Hold and Acquire/Hold operation. Accuracy is
not specifiedfor the .l V range.

Connect Guard to Input Low or damage to
the instrument mav result.
a. Set 3490A FUNCTION to DC, RANGE to I V,
SAMPLE/HOLD to TRACK/HOLD, SAMPLE RAT.A,
fully clockwise.
b. Connect dc standardbetweeninput High and Low
terminals.
c. Select 3490A rangesand dc standardpositiveand
negative outputs listed in Table 5-6. Display should be
within limits shown in eachcase.
d. Set SAMPLE/HOLD to ACQUIRE/HOLD and
repeatstep c.
$34. Sample/HoldResponse
Test.
5-35. A function generator (-hp- 3310A), an oscilloscopewith delayedsweepand delayedgateoutput (-hp
l80C/l80lAll82lA), a silicon diode, and a l0kh
resistor are required for this test, which verifiesthat the
Sample/Holdcircuits will respondto a step input voltage
within the stated acquisition time. The Delayed Gate
Output from the oscilloscopemust be a negative-going
pulse at least 30 nanosecondswide and havins an
amphtudeof I to 100 V.
f,. Conne''r equipmentas shown in Figure 5-7. If the
-r490A ha: BCD Remote Expand Option 020, also
i+

Table 5-6. Sample/HoldDC AccuracyCheck.
3490A
Range

DC Standard
Output

Display Limits

1 V

r 0.10000V
r 0.50000v
r 1.00OO0V

r 0.0998to 0.1002V
! 0.4998 to 0.5002 V
t 03997 to 1.0OO3
V

10v

1 1.00000v
r 5.00000 v
I 10.0000V

100998 to 01 .002V
+ 04998 to 05.002 V
! 09.997 to 10.OO3V

1 0 0v

r l0.0O0OV
r 50.0000 v
r 100.000v

t 009.98to 010.02V
t 049.98ro 05O.O2V
I 099.97to 100.03V

1000v

1 1 0 0 . 0 0 0v
t 500.000v
' + 1 0 0 0 . o ov

t 0099"8to 0100.2 V
! 0499.8 to 0500.2 V
r 0999.7to 1OO0.3
V

* lf -hp- 74OB DC
Standard is used, do not apply negative
\roltage greater than - 5OO V.

connäct StretchedPulseOutput (J7 pin l0) to External
Enclode(J7 pin 28).
b. SEt 3490A FUNCTION tO DC, RANGE tO IO V,
SAMPLE/HOLD to TRACK/HOLD, SAMPLE RATE to
HOLD.
c. Set oscilloscope controls for External Trigger,
negative slope, and Main sweep. Set Main sweep to
.1 ms/div.,Delayedsweepto I ps/div.
d. Set function generatorto squarewave, frequency
to I kHz, and adjust output level for 20 V peak-to-peak
signalas displayedon oscilloscope.
e. Adjust oscilloscopedelay control so that intensified trace begins approximately 450 ps after negativegoing transition of squarewave. Note 34904 reading,
which should be near zero.
f. Adjust delay so that intensified trace begins
approximately 125 ps after negative-going
edgeof square
wave (stated maximum acquisitiontime for l0 V range
is 128 ps). Reading should be within 1 0.001 V of the
readingnoted in stepe.

PERFOHMANCE
CHECKS

Model3490A

Section V

O S C I L L O S C O P EPLI.JGIN PLUG IN
hp lSOD
hp l80lA hp l82lA

FUNTION GENERATOR
hp 3310A/B
OELAYED
GATEOUTPUI
TOSAMPLE/HOLD
ACTRIGGER
INPUT

Figure$7. Sample/HoldResponseTest.
g. Set oscilloscopemain sweepto .5 ms/div.
h. Adjust function generator frequency to 200H2,
output level to 2 V peak-to-peak.
i. Set 349OARANGE to I V.
j. Adjust intensified trace to approximately I ms
after the negative-going edge of square wave. Note
reading, which should be near zero.
k. Adjust intensified trace to approximately 500 ps
after the negative-goingedge of square wave. Reading
should be within t 0.001 V of readingnoted in stepj.

(0ption080).
536. RATI0PEBF0BMANCE
5-37. The dc and ac voltage measurementperformance
of the 3490A must be within specifications before
proceeding with the ratio performance tests. Refer to
Paragraphs5-9 and 5-l l.

$38. DC/DCRatioAccuracy
Tests.
5-39. Preferred Method. Two dc standards(-hp- 7a0B)
are necessary for this method, making it possible to
check performance at various levelsof EXT REF voltage
and INPUT voltage. Both dc standardsmust be floating,

since IMUT Low and EXT REF Low terminals are
connectedinternally. If only one dc standardis available, go to Paragraph540.
a. Set 3490A RATIO switch to EXT REF I V.
Connect a dc standard to 3490A INPUT terminals and
adjuststandardoutput to + 0.10000 V.
b. Set 349OA FUNCTION to DC, RANGE to 1 V.
Connect a second dc standardto 3490A IMUT termi_
nals and adjust standardoutput to + g.lgggg V. 3490A
displayshouldbe + 0.99955 to + 1.00045.
c. Select EXT REF and INPUT rangesand voltages
listed in Table 5-7. Display should be within limits
shovmin each case.
540. Alternate Method. A dc standard(-hp- 74OB)and
a secondvoltagesourcehavingan output of l0 V + 5 %,
stable to within I mV/hr, are required for this method.
Both the dc standard and the secondvoltage source must
be floating. A 9.8 V mercury battery (Mallory TN77) is
.e satisfaQtorysource. The following procedure will refer
" to the secgndvoltagesourceas the battery.
a. Set 34904 RATIO switch to INT REF. FUNC_
TION to DC, RANGE to 10 V.

Table5-7. DC/DC Ratio AccuracyTest.
Ext Ref
Range

1 V
1 V
1 V
1 V
1 V
1 V
1 V
10v
10v
10v
10v

Ext Ref
Voltage

+ 0.10000
v
'+ 0.50000v
+ 1.00000v
+ 1.00000v
- 1.00000v
- 1.00000v
+ 1.20000v
+ 1.00000v
+ 5.00000v
+ 10.0000v
+ 12.0000v

Input
Range

1 V
1 V
1 V
1 V
1 V
1 V
1 V
10v
10v
1 0 0v
1 0 0v

Input
Voltage

+ 0.10000
v
+ 0.50000v
+ 1.00000v
- 1.00000v
- 1.00000v
+ 1.00000
v
+ 1.00000
v
+ 1.00000v
+ 5.00000v
+ 100.000 v
+ 100.000 v

Display Limits

+ 0.99955to + 1.00045
+ 0.99979to + 1.00021
+ 0.99982to + 1.00018
- 0.99982to- 1.00018
+ 0.99982to + 1.00otg
- 0 . 9 9 9 8 2 1 o -1 . 0 0 0 1 8
+ 0.83316to + 0.83350
+ 09.9955to + 10.0045
+ 09.9979to + 10.0021
+ 099.979to + 100.021
+ 083.313 to + 083.353

5-7

PERFORMANCE
CHECKS

Section V

b. Connect the battery to IMUT terminals, * to
HIGH, - to LOW. Note and record 3490A display.
c. Connect dc standard to EXT REF terminals and
set standard output to positive voltage equal to display
noted in step b.
d. SET 490A RATIO switch to EXT REF l0 V.
Display should be + 09.9982 to + 10.0018.
e. Reverse polarity of dc standard output. Display
shouldbe -09.9982to - 10.0018.
f. Set RATIO switch to INT REF. Reversepolarity
ofbattery connections.Note and record display.
C. Set RATIO switch to EXT REF 10V. Adjust dc
standard output to negative voltage equal to display
noted in step f. Dsplay should now be +O9.9982 to
+ 10.0018.
h. Reverse polarity of dc standard output. Display
should be -O9.9982to - 10.0018.
i. Reduce dc standard output to 1/10 the output
usedin steph.
j. Set RATIO switch to EXT REF lV.
shouldbe -09.9982to - 10.0018.

Display

S41. AC/DCRatioAccuracy
Test.
5-42. A dc standard (hp- 7a0B) and an ac calibrator
(hp-7a5A) are requiredfor this test.
r...
a. Set 3490A RATIO switch to EXT REF I V.
Connect dc standard to EXT REF terminals and adiust
standardoutput to + 0.10000 V.
b. Set 3490A FUNCTION to AC, RANGE to I V.
Connect ac calibrator to IMUT terminals and adjust
calibrator output to l00mV at l00Hz. Display should
b e 0 . 9 9 8 6 5t o I . 0 0 1 3 5 .
c. Select EXT REF and INPUT rangesand voltages
listed in Table 5-8. Display should be as indicated in
eachcase.

Model34904

Test.
InputResistance
Reference
5-43.External
544. L dc standardChp- 7a0B) and a l0k9"tO.l%
resistor(-hp- 0698a157\ arerequiredfor this test.
a. Set 34904 RATIO switch to EXT REF l0 V.
FUNCTION to DC, RANGE to l0 V.
b. Connect 3490A. dc standardand l0 k,f) resistoras
shownin Figure 5-8. Connectjumper acrossresistor.
c. Adjust dc standard output to + 10.0000V. Note
34904 display.
d. Removejumper acrossresistor. Display should not
change more than 100 counts, verifying an EXT REF
input resistanceof ) l0? Q.

(0ption030).
CHECK
5-45.GPIB0PEBATIONAL
546. A GeneralPurposeInterfaceBus systemcontroller
and a printer are required to verify the operation of the
3490A Option 030. Two proceduresare given.The first,
in Paragraph547,is a generalprocedureto be usedwith
any bus controller. The second, in Paragraph 5-49, is
essentially the same procedure written specifically for
the 9820A calculator. If the 3490A I/o circuits fail to
operate correctly, refer to the GPIB troubleshooting
information, Par agraph 749 .
l. Initialize
LEOP - Set End Output [.ow
HEOP - Return End Output to iligh
LREN - Set RemoteEnable LOW
2. Send addresses(see Paragraph 3-104 for 3490A
addresscodes)
Set Multiple ResponseEnableLOW
LMRE
? (77s) - Universalunlistencommand
6 (668) - 3490A listenaddress(3490A placedin remote mode)
HMRE - Set Multiple ResponseEnableHIGH
3. Sendprogramminginstructions

i)

rJ

TestNo. I

Table 5-8. AC/DC Ratio Accurary Test'
Ext Ref
Range

i V
1 V
1 V
10v
10v
10v
10v

5€

Ext Ref
Voltage

0.50000v
1.00000v
1.20000v
1.00000v
5.00000v
10.ooo0 v
12.0000 v

Input
Range

1 V
1 V
1 V
10v
10v
10v
10v

lnput
Voltage

0.50000v
1.00000v
1.00000v
1.00000v
5.00000v
10.0000 v
10.0000 v

Display Limits

0.99865to
0.99865to
0.83218to
09.9865to
09.9865to
09.9865to
08.3218to

1.00135
1.00135
0.8348
10.0135
10.0135
10.0135
08.3448

Section V

CHECKS
PEBFORMANCE

Model3490A

DC STANDARD/DIFFERENTIAL
VOLTMETER
ho 74OB

MULTIMETER
hp 349OA

OIJTPUT CABLE
il0558

34$A-l_5045

Test.
Figure5-8. External ReferenceInput Resistance
rr \

t:

I

SingleReadingwith OutPut

r I)

I

ImmediateInternal Trigger

E -

Execute

5 )

R
4 )
E

12. Sendaddresses
l-l\,tRE
?
Unlisten command
V - 3490A talk address
- Addressof listener
HMRE

4. SendAddresses
LMRE
- Unlisten command
2
V (1268) - 34g}Atalkaddress
' Addressof listener
HMRE

13. Accept 3490A reading
Check for DC

5. Accept 3490AoutPut
Check for logic test sequence

14. Sendaddresses
LMRE
?
Unlisten command
3490Alisten address
6
- Addressof talker
HMRE

6. Have 10 readingsbeenmade?
Yes - Go to 10
No - Continue
7. Sendaddresses
LMRE
?
Unlisten command
6 - 3490A listen address
- Addressof talker
HMRE
8. Send programminginstruction
E - Execute

9. G o t o 4

lo v Ranse

15. Sendprogramminginstructions
..

E l

:}
z t

AC

E
16. Sendaddresses
LMRE
'!
Unlisten command
V - 3490A talk address
- Addressof listener
HMRE

1 0 .Sendaddresses

I

l
't

LMRE
? - Unlisten command
34904 listen address
6
- Addressof talker
HMRE
I l. Sendprogramminginstruction
trl

öt

DC

17. Accept 3490A reading
Check for AC
18. Sendaddresses
LMRE
'l
Unlisten comrnand
6 - 3490A listen address
- Addressof talker
HMRE

5-9

PERFORMANCE
CHECKS

Section V

19. Sendprogramminginstructions

it l l

Ko

p l
:o lI

.l kQ Range

E
20. Sendaddresses
LMRE
?
Unlistencommand
V - 3490A talk address
- Addressof listener
HMRE
21. Accept 349}Areading
Check for KO and .l kSl range
22. Sendaddresses
LMRE
't
Unlisten command
6 - 3490A listen address
- Addressof talker
HMRE

Model3490A

29. Accept 3490A reading
Checkfor l0 kO range
30. Sendaddresses
LMRE
? - Unlistencommand
6 - 3490A listen address
- Addressof talker
HMRE
3l . Sendprogramminginstructions
R I
100 kO Range
;' )

r t
E

32. Sendaddresses
LMRE
? - Unlisten command
V - 3490|talk address
- Addressof listener
HMRE
33. Accept 3490 Lreading
Checkfor 100 kQ range

23. Sendprogramminginstructions
:t
) ,

lkQRange

E
24. Sendaddresses
LMRE
?
Unlistencommand
V - 349OAtalk address
- Addressof listener
HMRE

34. Sendaddresses
LMRE
? - Unlisten command
6 - 3491Alisten address
- Addressof talker
HMRE
35. Sendprogramminginstruction
, P I

;z )l

1000kO range

E
25. Accept3490A reading
Check for I kO range
26. Sendaddresses
LMRE
2
Unlistencommand
6
3490A listen address
- Addressof talker
HMRE
27. Sendprogramminginstructions
R I
l0 kf,) range
a
a lI
E
lE. Sendaddresses
L\{RE
?
Unlistencommand
V - 3490A talk address
- Addressof listener
HMRE
r-10

36. Sendaddresses
I.IURE
'!
Unlisten command
V - 3490A talk address
- Addressof listener
HMRE
37. Accept 34g}Areading
Checkfor 1000 kQ range
38. Sendaddresses
LMRE
? - Unlistencommand
6
3490A listen address
- Addressof talker
HMRE
39. Sendprogramminginstructions
R I
10,000kQ range
;' )
t )

E

PERFOHMANCE
CHECKS

Model3490A

52. Returnto local
HREN

40.Sendaddresses
LMRE
2 - Unlistencommand
V - 3490A talk address
- Addressof listener
HMRE

TestProcedure.
$47. General
548. This procedurechecksthe ability of the 34904
GPIB circuits to accept and processaddressingand
and to output measurement
remoteprogramming,
data.
This proceduremay be used with any bus system
controller.

4 1 . Accept349D[reading
Checkfor 10,000kQ range
42. Sendaddresses
LMRE
2 - Unlistencommand
6 - 3490[listen address
- Address
of talker
HMRE

$49. TestProcedure
UsingModel98204 Calculator.
is written specihcallyfor the
5-50. this test sequence
-hp Model 9820A Calculator,and performsthe same
operatingchecksas the generalprocedurein Paragraph
547. Tllre9820A must havethe I I l44A Interfaceand
the PeripheralControl II ROM Block installed.Referto
the OperatingManualsfor theseinstrumentsfor operating instructions.The following test sequencemay be
recordedon an-hp CalculatorProgramCardandusedin
subsequent
testsand in troubleshooting.
Theprogramis
presentedin this procedurein the form that it is printed
by the 9820A. The first statementgivesan exampleof
the 9820Akeyboardsequence
required.

43. Send programming instructions
IT

:'

SectionV

Interrupt singlewith output

E
44. Check for SRQ LOW after 3490[completes a reading
45. Sendaddressand command
LMRE
V
3490A talk address
- Addressof listener
- StatusPoll Enablecommand
(30a)
HMRE

Initializethe calculatorand 3490Aby prpssing

46. Accept ASCII characterfrom 3490A
Check if LDIOT is LOW
47. Sendaddresses
LMRE
?
Unlisten command
6
3490A listen address
- Addressof talker
HMRE

EXECUTE

(End Output, EOP, is LOW while STOP key is depressed)
,."

SetLRENto LOW.
f-r

48. Send programming instructions
M )
Singlereadingwith outPut
t I

49. Send addressand command

(30a)
HMRE

T t't |

'','r!

llf.rT'

| . J I d _ ! r . r . r r :I .

{'-rl

I.:'r

The abovesequence
requiresthat the following keys be
pressed

E

I-I\,IRE
V

r

ri.{"t'

3490Atalk address
Addressof listener
StatusPoll Enablecommand

50. Accept ASCII characterfrom 34gOA
Check if LDIOT is HIGH

@o@o@o
r-T\

EUJ[I

STORE

Setcounterto l.
5l . Sendaddressand command
- Universaluntalk address
- StatusPoll Disablecommand
(31e)

1 r
I r

1+ tll5-l I

PERFORMANCE
CHECKS

SectionV

Address 3490A to listen, calculator to talk. 9820A talk
addressis u. This puts 34904 in remote control. Program
3490A to Test No. l, Single Reading with Output,
Immediate Internal Trigger.

Address calculator to listen, 34go^ to talk. calculator
listen addressis 5. Accept 34904 reading.
I
::::!

" i:j,.,"
H"'iiF:i,l'.l":+ir
r::::f,.li:r
F;:ä il

Address 3490A to listen, 9820A to talk. Program Ohms
function, .l ke range.
j. rjj I
" ''':'r:l' " "
t"':i'i i't
l"'i I i:::'I i.;:*' i::i'
"1
'-'
] i
r-'
: r

" "
'
t:::i',ii::l ',:'r:ii".l r i::i;i [i:'::';'1
::::ll"1[::"l"-

Model 3490A

,

{

. i , ü . i

Address3490A'to talk, 9820A to listen. Accept 3490A
readingcheck for Ko function'
:i.:1.I
"
"
i:::l'll:l 'lr"' rr; i Fi:l.'t[:ili:.iil

,
l;.::i:i[
; i I..i,:,i1,'T',,
;i:i;;
l;,i
,,
,,

l. ::ir f:li".

fj F:l-

Instruct calculatorto print reading,trigger 3490A, print the
next reading, etc., until a total of l0 readingshave been
taken and printed, then go to 6.

l:.r.-i i_.

Instruct 9820A to check last characterof output format
(seeParagraph34T).Checkfor .l kSl range.

4r
'l
p':,:il"i i:i I i:i;;'-[' t:::t
i F [t
* 1 üji ._tf,l|;i i: l"

:i;il
"i',ii:i
Fi:i.tfiil i. :.i:l
ii i. l-:' t"..:;.
i. llt
,r
!:::
-ur-.:
...,1
ii i
ii l''lF llri*

flir
._t n

i':l:

"',lri,i-l"
:i +.[rt-,'ht
i t::::l''l]:t
r
" " ,_ti1pt-*:l[ ii

] ['f:'"i'
i F .1- '::!lii;::::1:-,
"
i i,:. i"-

Address 34gOAto listen, 9820A to talk. Program3490A to
DC function, l0 V range.
t, :
i-.i.{ ii
r-, l l L.r

"F.

'r '-' j. | | r!
: l::1 l-l
I

I q I
i:":i'lll

" 'i

"
" "
i:, l,-l r |:i:l::;i:: i-

rr r i-J t..i ji t-.
l- I;;.t1',:.,.1 t.

r...
Address3490A to talk, g82OAto listen.Accept 34g0A
reading.Checkfor DCfunction.

' '::'"":::'
" i ü:l-rii::r
r:::i''ii:r
:i:.li
i

Address3490A to listen, 9820A to talk. Program3490A to
I kO range.

!

+ ,:l ii [:i:.i.i[il ]. :jti';,,::i [;::ithi
:i.:;il-:'',:::
i
-1" ii" I t- ' ii'::::1;,;r1
li [:
it t-: F.

Address
3490Ato talk,9820Ato listen.
.i I I
l"::i'lIl

: d:'i','i
f; " ii 1.{'i-: i-'

rast
ä'"1'JJ':li3'^,rl,
lg;,lt'i::r;Y?ä,:""r;l"k
:i i:i,!
l; 1 p: r".:
::;.i. :.i:t
i',,I,[' 1.:;;t"i,.,1'
i.-:li ..1
l{ Fi lil iI i +.r,::-i

Address3490A to listen,98204to talk. Progam34904 to

i . i r ..:1.....

AC function.

r.i ,, i

!:,

,,
dli:li::::
l; i i;::,i;:,.i.. :i.

'

i: i'iii

' '1ij " "
"
i i , [::.;i::[: l'"

Address 3490A to talk, 9820A to listen. Accept 3490A
reading.Checkfor AC function.
' ':.",,,, '
i_ i: Ii
i
; il;:.1)
[::t ]. ::;rl
* f i E:IrE: l, ,;r-:*;'I i:;,::1.:r[:ir
l l : : : : i ,i i i
_.;+l;ip
;;:'itrf
5 - ll

i F.

Address349olto listen,9g20Ato talk. prosram34904 to
l0 kO range.
i l:ilI
" "
"
"
r.":
ii j..r 1'1,!.-i r Iii:,,:iil:: i."

Address3490A to talk, 9820A to listen.
l i ; rI
.t:iri,,rilx"I:l,,,r:-:i-.
t::f,ll.l

PERFORMANCE
CHECKS

Model3490A

Accept 3490A reading. Instruct 98204 to check last
characterof output format. Checkfor l0 kSl range.
,:

SectionV

Accept 3490A reading.Instruct 98204 to check last
of outputformat.Checkfor 10,000kO range.
character

r:t tr

FiIlLt :l ::l't il i I [:r t-.::i;:l ;ll
t-:I .-ll'lF lir1""
i 1 +'t-:..+

i':Ilhl :i,:;i'+;:tli 1'F l":::;:I ::::l
t:':ii .."t
|',]l-,, i:lt"
I l. +.r".:1!

"i'..".;{ :::
"
ili 4. [ l:r,ü,"1" ].
I F
"
Hfi l-.

"1' ,'
:i,
.i:f ijl .".,itjil::rI i i:rfi:
g I' tj;tti:ilili':'"
l'"

Address3490Ato listen,9820Ato talk. Program3490Ato
100kO range.

Address3490A to listen,9820A to talk. Program3490A
operating
modeto InterruptSinglewith Output.
.._,.t ,

r

d:.:

"
" "
"''i:'rl,Ll
r [i:::xtHl"
L:t,lIt
Address3490Ato talk,982OAto listen.
t::f'lIt

i-:t,ll.t

Check ServiceRequestline. If line is LOW, go to 36.

" {' r,,,r " li "! t::
lI
l;

..1' .*l r

.|.
I .-l1,1
t"' |::i:,.
[: It:::; I :;l":,1:1
td

Accept 3490A reading.Instruct 9820A to check last
character
of outputformat.Checkfor 100kO range.
cLt:
":'L
r.- :i I ..:'
t I II ..:'
l':. .Ll Ei
!
{ -r
r r - . ":r't_.
r r-.r
lrJFr
i-rl
t-.
.-t
! I
!
l'l r
[.t T"
,:: .-l
T T
L T

Address3490A to talk, 9820A to listen. Send StatusPoll
Enable.Check 3490A responseto SPEon data line LDI07.

r. _- !+,:t _..::, !

r

F.

I

. . l r T t r , :I rT

I

"

f'

Address34904 to listen,9820Ato talk. Program3490Ato
1000kO range.
r-, l llr

.i-

L it '[ t];:'

I ::;

['"t-tlil

"

F

Address3490A to listen, 9820A to talk. Program 3490A
operatingmode to SingleReadingwith Output.

:' |:' r-r

I

l.:.c. I:

T

.-ri

r-. I't Ir

:' ,,, ,-r

! I "r r.-.r'

Accept 3490A reading. Instruct 9820A to check last
characterof output format. Checkfor I 000 kQ range.
r

["iIlEl I :il.+I I 1 ;: r::::iI ::i
i 1 r"r*:+t::
rjtl".
i ,.-tf,1F

I F r * ' 4 r : r * ! i t ' F :"TI

r

ia F.l.l1
r.-. l'l Ir

Address3490A to talk,9820A to listen.

r:'

:r rr. Ir tj

U ' . , r E . .r: r1F . I

!

C.|:t

L:

r,, ....r..- rlll

r*,l llr

!

l:-l l:l fr.

"
" "
" dl
rl,l...l r [,i;'H l-'

!r r-i r- | | r
:' (:, t-t

!

r' t..{,.-r fl'|..:' r

I

I
I."

Address3490A to talk, 9820A to listen. Send StatusPoll
Check 3490A responseto SPEon dataline LDIO7.
E_nable.
ia.:
i1 tJT'
l_.. l l Il

.i
.:.

r'itH:rr,..'!rrr.'fir'i
r,r ..-l i- ':'
I r:. .L.l I:'

.: -r !_.. t! .i. r-

r-., L

|:' ,:' !

"Lfii,;';''I:l;

t- F.

I

HIr;1-1,,p

Send universal untalk address and Status Poll Disable
command.

ütJtJl'::"F
Address3490Ato listen,9820Ato talk.Program34904 to
IO,OOO
kQ range.
t::i'1It " ';'t, l-i" I ,' t: i h",, i"
Address
3490Ato talk,9820Ato listen.

j-.

t.{ l,i

r:f,lIr " ';'i"5" i 1.+r::i.-

,.

$r f1

r

I

Set LREN line to HIGH and end program.
,t {.1 n
-t"
i" T.{

r t.t I
.j' l. .

il

r i . i

r..r .i
.i.

i

.'.:r r

I i t..i -r.

:r ,::..! l.t.tt.r. |

{

ri I

.j. .: r-

r

F: hi tl

t,.,.

5-l 3

PROCEDURES
ADJUSTMENT

SectionV

$ 5 1 .A D J U S T M EPNRTO C E O U R E S .
5-52. Complete adjustment proceduresfor the Model
3490A Multimeter, including options, are containedin
the following paragraphs.These proceduresshould be
performed only after it has been determined from the
PerformanceTeststhat the 3490A is out of adjustment.
The adjustmentsin Paragaphs5-53 through 5-60 must
be performed in the order given, and before the ac, ohm,
sample/hold and ratio adjustments.If any adjustment
cannot be made correctly, refer to the Troubleshooting
Proceduresin Section VII. Location of adjustmentsin
the standardinstrument is shownin Figure 5-9, Sample/
Hold adjustmentsin Figure 5-10, and Ratio adjustments
in Figure 5-l l. All adjustmentsare shown on the top
guardcover. Turn the 3490A on and allow it to warm up
for at least 4 hours with the coverson before performing
the adjustment procedures. The top cover must be
removed to gain accessto the adjustments,which should
be made with the guard(inner) cover on.

Model3490A

wARiltr{G
The inner cover is qt Guard potential. Use
caution to prevent shock when high voltages
are connected to the Input.

ADJUSTMENT.
5.53.POWEB
SUPPLY
5-54. A dc digital voltmeter with 4digit resolution and
an oscilloscopeare requiredfor this adjustment.
a. Connect digital voltmeter and oscilloscopebetween the + 17 V test point on AlAl and the input Low
terminal.
c. Set the sample rate on HOLD and measurethe
ripple present with the oscilloscope.If the voltages
specifiedin Table 5-9 cannot be met, refer to Section
VII, Troubleshootingand Circuit Diagrams.

f,:

w

Al F429
THERMALADJ.

46R28 i
lOVLF ADJ J

fi=i"l;

A7R16i
1OOKADJ

Figure5-9. Location of Adjustments,Standard3490A.
i

!

!

AOJUSTMENT
PROCEDURES

Model3490A

d. Check other power supply voltagesby connecting
digital voltmeter and oscilloscopeto test points listed in
Table 5-9. If any voltageis not correct, refer to Section

vu.

SectionV

b. Connectdc standardto 3490A input and adjust
standard
outputto - 10.0000v.
c. AdjustAlAlR3ll
- 10.0000.

(+Ref) for 3490Adisplayof

Voltages.
Table 5-9. PowerSUPPIY
A1A1
TestPoint
+ 17\l
+ 5V
+30V
- 17V
- 5V

- 30v

Ripple*

Voltage

+ 1 6 . 9 9 t o + 1 7 . 0 1V
+ 4.995 to + 5.075 V
+ 30.10 to + 30.90 V
- 16.9 to - 17.1 V
- 5.00 to - 5.85 V
- 30.10 to- 30.90V

< 50 mV p-p
< 60 mV p-p
( 25 mV p-p
< 50 mV p-p
(60mVpp
(25mVp{

*All ripple measurements
are with the SampleRate on
HOLD.

5.55.DCZEROADJUSTMENTS.
5-56. A dc standard (-hp- 7a0B) and a dc voltmeter able
to resolve l0 pV are required for these adjustments.
a. Connect dc voltmeter betweenAlAl
and input Low terminal.

test point A

d. Set 3490A FUNCTIONto TEST,RANGE to 3.
AdjustAlA1R3l7 (- REF) so that positiveandnegative
display readingsare equal within I count. Last digit
must be between2 and9 (0.9999x).If not, repeatsteps
a throughd. Dsconnectdc standard.
5.59.DCAMPLIFIER
ADJUSTMENTS.
560. A dc standard(hp- 7a0B) is requiredfor these
adjustments.
a. Set 349OAFUNCTIONto DC, RANGEto .l V.
Short input terminalswith a copperbar or heavysolid
copperwire.
b. Adjust AlR429, accessible
throughhole in rear
panel,for 3490Adisplayof 0 r .000002.
c. Set3490ARANGEto I V.

b. S€t 3490A SAMPLE RATE control fully counterclockwise to HOLD position.
c. Adjust AlAlR2l0 (lntZero) for voltmeter reading of 0 r 150 gV. Disconnectvoltmeter.
d. Set FUNCTION to DC. RANGE to l0 V. SAMPLE RATE to FAST.
e. Connect dc standard to 3490A input and adjust
standardoutput to + 0.00100 V.
f. Adjust AlAlR225 (Zero DetecI kvel) for maximum reading on 3490A display. Note reading.
C. Reversepolarity of input and adjust AlAlR228
(Tumover) for reading noted in step f. Continue
reversinginput polarity and adjustingAlAlR228 until
positive and negativereadingsare equal.
h. Apply + 0.00100 V input to 3490A. Adjust
AlAlR225 (Zero Detect kvel) for 3490A display of
+ 00.0010.

$57. REFERENCE
ADJUSTMENTS.
5-58.A dc standard
(hp- 7a0B)is required
for these

adjustments.

d. Removeshort from input terminalsand connect
dc standard.
Adjuststandard
outputto - 1.000000V.
e. Adjust A2Rl5 (l V Adj) for 3490A displayof
- 1.00000.
f. Set 3490A RANGE to 100V, and adjust dc
standard
outputto - 100.000V.
g. Adjust A2R3 (100V Adj) for 3490A displayof
- 100.000.Reducedc standardoutput and disconnect.
h. Set 3490A FUNCTIONto TEST,RANGE to 6.
Short input terminalsand note amountand polarity of
oTfsetreading.
i. Removeshortandapply- 10.0000V input. Adjust
A2Rl6 (0.1V Adj) for displayof - 1000.00,minus
(algebraically
subtracting)the offsetnotedin steph.
$6I. AC CONVERTER
ADJUSTMENTS.
5-62. Adjustmentof the dc circuits,Paragraphs
5-53
through 5-60, must be completedbeforebeginningthis
procedure.An ac calibrator(-hp- 745A) with a correction factor chart is requiredfor theseadjustments.
Guardcoversmust be in placefor this procedure.
5-63. I V RangeAdjustments.

Guqrd Terminal should be connected to Low
or damageto the instrument may result.
a. Set 3490A FUNCTION to DC. RANGE to t0 V.

a. Set3490AFTINCTION
to AC. RANGEto I V.
b. Connectac calibratorto 3490Ainput.Setcalibrator output to I .000000V at 100kHz (usingcorrection
factorchartasnecessary).

s-l 5

PROCEDUBES
ADJUSTMENT

SectionV

c. Adjust A6R32 (l V HF Adj) for 3490A displayof
1.00000.

Model 34904

a. Set FUNCTION to TEST, RANGE to 7. Short Q
Sigral terminals. Adjust A7R5 for display of - 9700.0
t 100.0 (Instruments with serial numbers below
l2l1A00656 may not havethis adjustment.)

d. Change ac calibrator frequency to 100 Hz and
adjustA6R27 (1 V LF Adj) for displayof 1.00000.

b. Set 3490A FUNCTION to O, RANGE to I k.
e. Repeat steps c and d until both readings are
correct.

c. Connect resistancedecadeto 3490A Input and O
Signal terminals. Connect 3490A Guard to Input Low,
and decadeGuard terminal to Low terminal.

Ajdustments.
5-64.10V Range

d. Set decaderesistanceto I kfl and adjust A7Rl4
(l k Adj) for display of 1.00000 (r decaderesisrance
error).

a. Set34904RANGEto 10V.
b. Set ac calibratoroutput to 10.00000V at 100 Hz.

e. Set 349OARANGE to 100 k.

c. Adjust A6R28 (10 V LF Adj) for display of
10.0000.

f. Set decaderesistanceto 100 kQ and adiust A7Rl6
(100 k Adj) for display of 100.000(t decaderesistance
error).

d. Change ac calibrator frequency to 100 kHz and
adjust A6C27 (10 V HF Adj) for display of 10.0000.If
maximum limit of adjustment is less than 10.0000,
remove jumper wire in serieswith A6C28.If minimum
limit of adjustment is greaterthan 10.0000,jumper wire
probably has been removed and should be replaced.

C. Set 3490A RANGE to 10,000k.
h. Set decaderesistanceto 10 M{-2and adiust A7Rl8
(10,000 k Adj) for display of 10000.0 (t decade
resistanceerror).

e. Repeat steps c and d until both readings are
correct.

5-65.100V Range
Adjustments.
a. Set3490ARANGE
to 100V.
b. Set ac calibratoroutput to 100.0000V at 100 Hz.
A6R3 (100 V LF Adj) for display of
,o;.o$|j"rt
d. Change ac calibrator frequency to 100 kHz and
adjust A6C6 (100 V HP Adj) for display of 100.000. If
maximum limit of adjustment is less than 100.000,
remove jumper wire in series with A6C4. If minimum
limit of adjustmentis greaterthan 100.000,jumper wire
probably has beenremovedand shouldbe replaced.
e. Repeat steps c and d until both readings are
correct.

tL

568. If an accurateresistancedecadeis not available,
adjustment of the ohms converter may be made using
resistors within l0 % of Ihe full-range value of I ke,
100 kf,} or l0 MO, whose resistancesare known to
within a close tolerance"Table5-10shows the resistance
valuesand the tolerancesrequired for valid adjustment.
The proper adjustment should be made so that the
3490A display reads the known value of the resistor.
Perfcirm step a of Paragraph5-67 before making a_djustmentsin Table 5-10.

5.69.SAMPLE/HO
LDADJUSTMENTS.
5-70. Adjustment of the dc circuits, Paragraphs5-53
through 560, must be completedbefore beginningthe
Sample/Hold adjustments. The following adjustments
must be performedin the order given.Figure 5-10 shows
the location of the Sample/Holdadjustments.They are
also shown on the top guard cover.

5-71.0ffsetGainAdjustment.
$66. OHMMETER
ADJUSTMENTS.
567. Adjustment of the dc circuits, Paragraphs5-53
through 5{0, must be completed before beginningthis
procedure. A resistancedecadewith a correction factor
chart (GR 1433-Z) is required for the following procedure. If a suitableresistancedecadeis not available.refer
to Paragraph548. The enor indicatedby the correction
factor chart should be taken into account when adiustins the ohms converter.For example,if the resistanöeof
the decadeis high at I kQ, the 3490A displayshould be
adiustedto 1.00000plus the resistancedecadeenor.
_i-16

5-72. A dc digital voltmeter having a resolution of
l0pV is required for this procedure,which adjuststhe
gain of the Offset Amplifier.
Table 5-10. OhmmeterAdjustment.
Resistance

3490A
Range

Value

1ko
100 ko
0,000 ks,

9 0 0o t o 1 . 1k o
90kato110ka
gMA to 11MO

Tolerance
L O.OO2'yo
t O.OO25o/o
! O.O1oÄ

3490A
Adlustment
A7R14
A7R16
A7R18

Model3490A

ADJUSTMENT
PROCEDURES

SectionV

5-73.0ffsetAdjustment.

a. Remove the toP guard cover.
b. Locate the white/black wire just to the rear of the
"5th
Digit
display cable connector. This wire is labeled
Blank" in Figure 5-10. Disconnect this wire from Test
Point L and connect to Test Point M. This restores the
display to five full digits for Sample/Hold measurements,
providing greater resolution in order to make the
following adjustmentsmore accurately.

5-74. This procedure adjusts the Offset Amplifier so
that there is no turnover error between positive and
negativeinputs. A dc standard(-hp 7a0B) is required.

c. Set 3490A FTINCTIONto DC, RANGE to IO V.
SAMPLE/HOLD to TRACK/HOLD, SAMPLE RATE to
HOLD. Short input Higfr to Low.

b. Adjust A27Rl3, Offset, for 3490A displayof zero
t 0.0001v.

d. Connect digital voltmeter between A27TP3 and
ground test point on AlAl. Recordvoltagereading.
e. Connectjumper wire betweenTestPoint LTST on
A28 and ground.
f. Set SAMPLE/HOLD switch to OFF. then back to
TRACK/HOLD.
g. Adjust A27Rl4, Gain Adjust, for digital voltmeter
reading the sameas that noted in step d I 0.0005 V.

a. With 3490A set to IOVDC RANGE, TRACK/
HOLD, and input shorted as in previousadjustment,set
SAMPLE RATE fully clockwise.

c. Dsconnect input short and connect dc standard to
input terminals. Set standard output to + 10.0000 V.
Note 3490A reading.
d. Reverse polarity of input (to - 10.0000V) and
note reading- Disregarding polarity display, adjust
A27Rl3 to split the difference between the readings in
I i'
stepc and step d.
e. Continue reversinginput polarity and adjusting
A27Rl3 until there is no numerical differencebetween
readingswith positive and negativeinputs.

h. Dsconnect digital voltmeter and remove jumper
wire between LTST and ground.

$75. Dielectric
Absorption
Adjustment.

i. Replace top guard cover and securewith only two
screws.

procedure, which adjusts the dielectric absorption compensation.

5:76.A dc standard(hp- 7a0B)is requiredfor this

sth DtGtT
BLANK

A27TP3

A27R14

A27R13

Figure5-10. Location of Sample/HoldAdlustments.

5-17

Section V

AOJUSTMENT
PROCEDURES

a. With 3490A set to l0 VDC RANGE, TRACK/
HOLD, SAMPLE RATE fully clockwise, and dc standard
connected to input as in previous adjustment, set dc
standardoutput to + 10.0000V.
b. Adjust A27R6, DA Gain,
+ 10.0000 V. (Display will be noisy.)

for

display of

S77. ResponseAdjustment.
5-78. This procedure requires a function generator(-hp3310A), a silicon drode, a l0kQ resistor and an
oscilloscope having a delayed sweep and a delayed gate
output (-hp l80C/DllOSlAllS2lA). The delayedgate
output must be a negative-goingpulse with an amplitude
of 2 to 200 V and a width of at least 30 nanoseconds.
a. Connect equipment as shown in Figure 5-7. If the
3490A has BCDiRemote Expand Option 020, also
connect StretchedPulseOutput (J7 pin l0) to External
Encode (J7 pin 28).
b. With 3490A set to l0 VDC RANGE and TRACK/
HOLD as in previous adjustment, set SAMPLE RATE to
HOLD.
c. Set oscilloscope controls for External Trigger,
negative slope and Main sweep. Set Main sweep to
.1 ms/div., Delayedsweepto I ps/div.
d. Set function generator to square wave, frequency
to I kHz, and adjust output level for 20 V peak-to-peak
signalas displayedon oscilloscope.
e. Adjust oscilloscope delay control so that intensified trace begins approximately 450 gs after negativggoing transition of square wave. Note 3490A readin$,
which should be near zero.
f. Adjust delay so that intensified trace begins
approximately 120 ps after negative-goingedgeof square
wave.
C. Adjust A27R3, Response,for display noted in
step e.
h. Remove top guard cover and move "5th Dgit
Blank" wire from Test Point M to Test Point L.
i.

Replaceand securetop guard cover.

Model3490A

öEEEEilEE
t
X9**ti**++QoL
Or;rra
-l

H I
) lcÄeiel
/ t 1 1 |
L:t-Jg

.E

g,lqe
I I

|

ot3
-Rr8-

[i----l
u5
I

TTfn0000000000
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|

7l

At3
h p P o r lN o . 0 3 4 9 0 - 6 6 5 1 3

Figure5-11. Location of Ratio Adjustments.

a. Set 3490A FUNCTION to TEST, RANGE to 4.
Set RATIO switch to EXT REF lV. Connect short
between EXT REF Hig[ and Low terminals.
b. Connect dc standard to INPUT terminals and
adjust standard output to + 10.0000 V. If the display
indicates Overload, reverse the polarity of the dc
standardoutput.

NOTE
Steps c and d adjust the zero setting of the
Extemal ReferenceAmplifier and the Feedback Amplifier. llith the 34904 set to Test
'
4, the integrator charges to the Extemal
' Reference Amplifier output and dischmges
to the ! 10.0000 V input. If the zero
adjustments are set so that the amplifier
output and the 3490A input voltage are the
same polaity, the dßplay indicates Overload.
c. Adjust Al3Rl7 (Offset 3) for zero display.If the
display goes to Overload, reversepolarity of dc standard
output and slowly adjust Al3Rl7 in opposite direction
for zero display. Continue adjusting A13Rl7 with
positive and negative 10.0000V inputs until display
readszero I 0.0001 V for either polarity input.

5.79.RATIOREFERENCE
ADJUSTMENTS.
5{0. Adjustment of the dc circuits, Paragraphs5-53
through 5{0. must be completedbefore beginningthe
Ratio Reference Adjustments. A dc standard (-hp74OB), a I M t l0% resistor(hp- 0698-1051)and a
stablevoltage sourcebetween9.5 V and 10.5 V, suchas
a mercun' battery (Mallory TRl77), are required for
these adjustments.Figure 5-1I showsthe location of the
Ratio adjustments. They are also shown on the top
zuard cover.
}l5

d. Set RATIO switch to EXT REF I V. Adjust
A13R8 (Offset 1) with positive and negative10.0000V
inputs for displayof zero t 0.0001 V.
e. Repeat steps c and d until display is zero
t 0.0001 V for both positive and negative inputs on
both I V and 10 V EXT REF ranges.
f. Remove short and connect I Mf2 resistorto EXT
REF terminals.

Model34904

ADJUSTMENT
PROCEDURES

s. Set RATIO switch to EXT REF I V' Adjust
efgni (Bias. Atlj.) with both positive and negative
10.0000V inputsfor displayof zerot 0'0005V'
h. Repeatsteps a through g until all readingsare
colTect.

i. DisconnectlMft resistorfrom EXT REF termi
nals. Set RATIO switch to INT REF, FUNCTIONto
DC, RANGEttr 10 V.
i. Connect a mercury battery between9'5 V and
10.5V. or other floating voltagesourcestablewithin
1 mV/hr, to INPUT terminals,- to Higfr,+ to Low' Note
3490Areading.

Section V

s. Set RATIO switch to EXT REF lOV. Adjust
Al3Rl4 (10 V Adj) for displayof - 10.0000.
t. ReduceEXT REF voltage to l/10 the voltage
selectedin step k (positive).Set RATIO switch to EXT
REF I V. Adjust Al3Rl2 (lV Adj) for displayof
- 10.0000.
u. Set RATIO switch to INT REF, FUNCTION to
TEST, RANGE to 3. This test alternatespositive and
negativereadings.Ifthe readingsarenot equalt I count
and between ! 0.99992 and ! 0.99999, adjust
AlAlR3lT C Refl to obtain this condition. Record
both readings(after adjustment).

k. Connectdc standardto EXT REF terminalsand
set standardoutput to positivevoltageequalto negative
readingin stePj.

v. Set RATIO switch to EXT REF l0V. Apply
- 10.0000V to EXT REF terminals. Readingswill
alternate+ and - as in previousstep. Recordpositive
reading.

l. SetRATIO switchto EXT REF l0 V- Note 3490A
display.

w. Adjust A13Rl9 (Offset301) for positivedisplay"
equalto

m. Reversethe polarity of the voltageat both the
INPUT and the EXT REF terminals.Adjust Al3Rl7,
repeatingstepsk throughm until the readinginstepI is
equalto the readingin stepm. (Polarityshouldbe - for
both readings.)
n. ReduceEXT REF voltageto l/10 the voltage
selectedin stepk. S€t RATIO switchto EXT REF I V.
With mercurybatteryconnectedto INPUT,- to HIGH, +
to LOW,note 3940A display.
o. Reversethe polarity of the voltageat both the
INPUT and the EXT REF terminals.Adjust Al3R8,
repeatingstepsn and o until the readingin step o is
equal to the readingin stepn. @olarity shouldbe - for
both readings.)

(positivereading,stepu) + (positivereading,stepv)
L

x. Adjust AlAlR3lT for positive display equal to
positive reading in step u.
y. Positive and negativedisplaysshould now be equal
t I count, and equal to readingsrecorded in step n + I
count, respectively. If not, repeat this adjustment
procedure (stepsa through x).
z. Perform DC Amplifier

Adjustment, Paragraph

s-59.

p. Repeat stepsj through o until all readingsare
correct.
NOTE
q. Connectmercurybatteryto IMUT terminals,- to
HIGH, + to LOW.
r. Connectdc standardto EXT REF terminalsand
set standardoutput to positivevoltageequalto negative
readingin stepj.

In order to operate the 3490A with the
Ratio AssemblyA I 3 removedand theRatio
JumperAssemblyA26 insertedin its place,
it will be necessaryto perform the Reference
Adiustments,Paragraph5-57.

5-19

PERFOBMANCE
TESTRECORD

Model 349oA
. . Hewlett,-PaQkard

resrs performed by _

SerialNumber
DESCRIPTION

PARAGRAPH

t',.

TEST LIMITS

DC Voltmeter Accuracy

$9
',

READTNG

':;:..'',
,..:

.:

10.0100ov
r0.05000v

.009995
.049990

tV

ro.100OOV

0.09997

0.10003
o.50006
1.00010

10V

11.0oooov
110.O0OOV

oo.gggz
0{1.9990

01.oo03
10.0010

r 10o.00OV

099.990

o10.o03
100.010

iloo.ooov
i 50O.00OV
+ IOOO.OO
V

0099.97

.

:,-:..,:.::i::..r:..,::.
,r,,,,,.,.

1OOOV

stt

Max.
.010005
.050010
.100015

.1 V

0999"86

0100.03
0500.08
1000.14

AC Voltmeter Accuracy

.
'':;;

'
:'t:1

Range
1 V

I nput
1 V
1 V
1 V

Freq.
2O Hz
1 Ok H z
1fl) kHz

0.99600
0.99875
0.99875

1.00400
1.00125
't.00125

10v

1 V
5V
10v

10OkHz
2OkHz
2O Hz

oo.9965
(X.9925
G).9600

01.oo35
05.0075
10.0400

lOV
tOO V

lOOHz
50 kHz

o09.965
o99,875

010.035

10 kHz
1O0Hz

0998.65
0998.75

1001.35
1001.25

10OV

lmo v

='t;!,' ,';,:

1000 v
1000v

1@.125

1 V

1 V

25O kHz

0.99190

1.OO810

10v

3V

25O kHz

02'9715

03.0285

Min.

Max.

.@9983
o99988
0{,.9s88
099.988

.1000t7
1.00012
10.0012
100.012
100o.14
100G'.7

Ohmmeter Accuracy
Range

Input r.,

t.rtj:..::..::
..

:,:i;.,:,'
,',.,,'

';'t:',:'.,,',t.

tr s9.86
09996.3
DC Common-Mode Rejection

0.00005

AC Common-Mode Rejection

o0.0001

AC Normal-Mode Rejection
DC Voltmeter Input Resistance
1 OV R a n g e
1O0 V Rangre
AC Voltmeter Input lmpedance
Without Rear Terminal
25 Hz
25O kHz
With Rear Terminal
25 Hz
250 kHz

oo.0316

000.908

0.65975
0.49211
o.65804
o.41321

oo.0010
oo0.910

CONT'D}
PERFORMAN
E TB E C O R(D
TC
ES
PARAGRAPH

DESCRIPTION

5-32

READING

TEST LIMITS

Sample/Hold DC Accuracy
Track/Hold

Range
1 V
1 V
1 V

Input
* 0.10000v
r 0.50000v
r 1.0oooov

10v
10v
10v

Min.

Max.

t 0.0998
r 0.4998
! 0.9997

0.1002
0.5002
1.0003

r 1.00000v
r 5.00000v
I 10.oo00v

r 00.998
r 04.998
r 09.997

01 .o02
05.002
10.o03

1 0 0v
1 0 0v
100v

r 10.0000v
r 50.oo00v
i 100.000v

r 009.98
r 049.98
r 099.97

010.02
o50.o2
100.03

1000v
1000v
1000v

! 100.000v
r 500.000v
1 1000.00v

r 0099.8
* 0499.8
r 0999.7

oloo.2
0500.2
1000.3

Acquire/Hold
1 V
r o.10000v
1 V
1 0.50000v
r 1.00000v
1 V

! 0.0998
+ 0.4998
r 0.9997

o.1002
0.5002
1.0003

r l.ff)OooV
I 5.00000v
! 10.oo(nv

I 00.998
r 04.998
r 09.997

ol .o02
05.oo2
10.oo3

100v
100v
100v

r 10.oo00v
1 50.ooo0v
1 100.ooov

r oo998
r 049.98
t 09937

010.02
o50.o2
'too.03

1000v
1000v
1000v

r loo_ooov
I 50o.ooov
r 10fi).00v

r OO99"8
! 0499-8
! 0999.7

0100.2
0500.2
1000.3

10v
10v
10v

5-34

Pos.

Neg.

' ' a ? . - : _

Sample/HoldResponse
1 0 V r a n g e , lk H z
1 V range,2OO
Hz

5-38

r 0.001v
r 0.oo1v

DC/DC Ratio Accurary
Preferred Method
Ext Ref
Range

Ext Ref
Voltage

1V
1V
1V
1V
1V
1V
1V
10V
lO.V
lOV
10v

+ 0.10000v
+ 0.50000v
+ 1.O0000v
+ 100000v
- 1.ü)O00v
- 1.00000v
+ 120000v
+ 1.0000OV
+ 5.0OO0O
V
+ 1 O . O 0 0V0
+ 1 2 . O O OV0

Input
Range
1 V
1 V
1 V
1 V
1 V
1 V
1 V
10v
10v
1 0 0v
1 0 0v

I nput
Voltage

Reading

+ 0.10000
v
+ 0.50000v
+ 1.00000
v
- 1.OO000
v
- 1.0qn0 v
+ 1.OO000
V
+ 1.00000v
+ 1.00000v
+ 5.00000v
+ 100.000 v
+ 100.000 v

Min.
+099955
+ 0.99979
+ 0.99982
- 0.99982
+ 0.99982
-0.s9982
+ 0.83316
+ 099955
+ 09.9979
+ 099979
+083.313

Max.
+ 1.OO045
+ 1.OO021
+ 1.00018
- 1.OOO18
+ 1.00018
- 1.00018
+ 0.83350
+ 10.0045
+ 10.0021
+ 100.021
+083.353

09.9982
09.9982

10.o018
10.0018

Alternate Method
Ext Ref
Range

lov
1 V

Pos.

Neg.

CONT'D}
TC
EE
S TR E C O R( O
PERFORMAN
DESCRIPTION

'^.:;^*

READING

TEST LlMITS

AC/DC Ratio Accuracy

.:. Ext Ret
F"ngu
11;,',
,

'

:

l V

lv
l V

1gv
- 10v

Ext Ref
Voltage

lnput
Range

I nput
Voltage

0.50000
v
t.ooooov
120000v

1 V
I V
1 V

0.50000v
1.00000v
1.00000v

1.00000v
5.00000v
10.ü)oo v
12.0000 v

t0v
10v
10v
10v

1.00000v
5.00000v
10.o@o v
10.0000 v

External Reference Input
Resistance Test

Max.
099865
099865
0.83218
099865
09.9865
09.9865
08.3218

Min.
1 .O0135
1.00135
0a344{l
10.0135
10.0135
10.o135
08.3448

10O counts change

Model34904

Section VI

sEcTt0N
vl
R E P L A C E A BPLAER T S
6 - 1 .I N T B O D U C T I O N .

6 . 4 .O R D E R I NI N
GF O R M A T I O N .

6-2. This section contains information for ordering replacement pafts. Table 6-l lists parts in alphamericorder of their
reference designators and indicates the description, -hppart number of each part, together with any applicable
notes and provides the following:

6-5. To obtain replacement parts, addressorder or inquiry
to your local Hewlett-Packard Field Office. (SeeAppendix
B for list of office locations.) Identify parts by their
Hewlett-Packard part numbers. Include instrument model
and serialnumbers.

a. Total quantity used in the instrument (Qty column).
The total quantity of a part is given the first time the part
number appears.

6.6.NON.LISTED
PARTS.
6-7. To obtain a part that is not listed, include:
a. Instrumentmodel number.

b. Description of the part. (See list of abbreviations
below.)

b. Instrument serial number.
c. Descriptionof the part.

c. Typical manufacturer of the part in a five-digit code.
(SeeAppendix A for list of manufacturers.)

d. Function and location ofthe part.

6.8.PROPRIETARY
PARTS.
d. Manufacturerspart number.
63. Miscellaneousparts are listed at the end of Table 6-1.
Hz.

6-9. Items marked by a dagger (f) in the reference
designator column are available only for repair and service
of Hewlett-Packardinstrumenrs.

ABBREVIATIOilS
. . . hertz {cyclelsl per sond)
NPO . .

tD.
rmpg

inside diamet6
. . impregnated

..........n€g6tiw tDsitive
zero
lz4o temrrature 6ef f icient)
-.. nan@cond{s} = lO-9 econds
...... notsp4acly repleable

..incande$ont
. in$larion{edl

Ta.......
T C. . . . . . .

@J..
c@f

.

@dp

L........,
lin,.............
lo9. .., ,. ...

dep.DPOT
OPST
el4t
acap

FET
txd ..

......

. . - .faradld
fieldeflet trilsistor
.........rixed

....inductq
..linedtapü
. . . l o g o r i t h m i ct a p d

mA .. . .. ., . .. milliampere{s}= 1O3 amera
MHz ..............megahenz= 10+6here
Mll...............megohmlsl - 10+6ohms
retllm .....
.........retatjilm
mtr.......
.,...mmuf*'tiiä
ms
mt9

yr

NC
Ne..
NO

. . nanoampere{s)= 1O-9a-oer*
. . . . . . . n o r m a l l yc l o s d
So . .,
.neon *ct
n o r m a l l yo p e n S i . . . . . ,

..., .elenium
.......*ction(sl
......silicon

,.. . ... .,optimum value eletcd atfcbry.
@rage value *tom {pm may be mined}
... ... .. no dildatd type numbc? 6i9ned
$lectgd d +ecial type
@

Dupont de Nemorc

DECIMAL MULTIPLIERS
Pr.lix

Symbols

Eta
gr9

T

rpga

M or Meg

kilo

Kork

h&to

h

deka

da

deci

d

M0ltipli6

to12
to9
ro6

rd
t02
lo
1o-1

Pr.fix

Symbok

Multiplie

centi

c

10-2

milli

m

tO-3

micro
nano
pico

lI
n
p

to€

femto

t

10-12
tO-15

afio

a

19-18

l0-9

DESIGNATORS
8 .
c .
CR
OL
6

.........asmblv rL
. , . . . . . . . . . moto1 H R
..........battery
........€pertor
J .
. . . . . - . . . . . d a o d eK .
........&tay line L .
. .
......,Emp
mis eletronic part
MP
. . . . . . . . . . . .l u $ P .

. .filter O. . .
. . . . . . . . . h e a r e rO C R . . . . . . . . .
i n t e g r a t e d c i r c u8i t. . , . . . . . . . . .
... .... iack RT
. .. . . ..relay S
. . . . . . a n d u c t o rT . ,
..... ...meter TB.
rechani@l parl
TC.
plug TP .

sTD-A-2734

.....,ransi$q
- üansi$ordiode
........resisor
.....thermistor
.........sitch
.... trans{ormet
. . teiminal tE*d
...therrccouple
..-...tdpornt

6-l

Section VI

Model 3490A

T o b l e 6 - 1 . R e p l o c e q b l eP o r t s

Reference HPPartNumber otv
Designation

AI

O349O-{165Ol

alcr
^tc2

ol 50-0093
ot 50-o093

^lc3
^tc4
alc5
alc6
alcT

ot
ol
oI
ol
ol

alcS
Alc9
alclo'

ol 50-o093
ol ao-l 7ot ^
or60-or34 lg\

^tclol
llclo2
Alclol
a lc lo4
alclo5

ol80-2510
olao-251o
ol 80-2 509
0 I 80-?50 I
ol 80-2510

alc lol
alc lo'l
alcloe
alclo9
alcll o

ol 80-2 5t o
ol 80-2 509
olao-o309
or 50-0071
o 180-o I 97

alcll I
alc ll 2
alcll.z
atcll4
a lcll5

ol
ol
0l
ol
ol

alc ll c
alcllT
Älc ll I
Al c r r 9
Alcl2l

I

26

50-o093
50-o093
50-oo93
50-oo93
50-oo93
I
I

4
3

Mfr
Code

Mfr PartNumber

I { A I N C I R C { I I I B O Ä R OA S S Y

28480

o349(F66501

c:FxD CFR o.0l UF +8G-2ot loovDcr
c:FxD cFR O.0l uF +80-20t IooYDcf

72982
729A2

aol-Kaoool I
801-x800011

c:FXD CFR 0-Ol UF
c:FXD CER O.01. uF
c:FxD cFß o.0l uF
c:FxD c€R o-01 uF
C:FXO CER O.Ol t,F

129A2
72942
l29A2
72.r 82
t2942

aol-K8000 ll
8 0 1 - K 8 0 0 0 1I
80 t-K8000 l1
801-K80001 I
801-K8000 1l

c:FxD cER O-01 uF +80-20* loovDcH
C:FXD EL€CT 5.8 UF 20? 6VDC}'
C:FXD IIICA ?2OPF 5t 3oOVDC|{

72982
2A4AO
t4655

80t -K800011
o180-l?o I
RDilI5F22IJ3C

c:FxD 250
C:FXD 250
c:Fxo 125
c:FxD I25
C:FXD 250

28480
24480
28{80
24440
28t80

olao-251 o
o l 8 0 - 2 5 10
o1.80-2509
olao-z509
o 180-25IO

Description

UF
UF
UF
UF
UF

+80-201
+80-20t
+80-201
180-20t
+80-20:

IOOYDCT'
loovocH
loovDcl{
loovDct
IOOVOCT{

3oVDClt
3oVDCtl
5oVDCY
50VDClr
3OVDCT

C:FXD
c:Fx0
C:FXD
C:FXD
c:FxD

250 rrF 30VDC!
125 rrF 'ovDct
ELECT4.? UF 2OI IOVDCI
CER 400 PF +80-2Ot 500VDCta
ELFCT2.2 UF tot 2oVOC||

24480
28480
562 89
249
562A9

ol 80-25 I O
olao-2509
Itoo4TSXOOt Ot2-OYS
c0168102E4,01J627-CDH
l5ü)225I9O2 r-lA2-OY
S

c:FxD
csFxD
clFxD
c:FxD
C:FXO

F T E C Tl 5 U F l o t 2 o v D c t
cER O.05 rJF +AO-20t IOOVDCT
FLECT 1.0 t,F lot 3'vfr.H
cER 1000 PF +80-20t looovocL
ETECT It trF lot 2OvDCr

2A480
91418
*249
5C,2A9
28480

otao-1746
rA
ItoD 1o5x9035A2-OYS
c0678l02E l02 ZS26-COH
ol80-1746

0180-0309
ol 50-o096
o 1 . 8 0 - o 2 9I
ol 80-2507
or 50-0096

C : F X O E T E C T4 - ? U F 2 0 t l o v D c r
C:FxD CER O.05 UF +A0-2O: IOOVDCT
c:FxD ELECT 1.0 UF lO! 35VDCL
c:Fxo 6000 uF
CrFxD CER O.O5 UF +8O-?Ot IOOVOCt

56289
91418
56249
24 4 8 0
91418

l50D475XOO10A2-OYS
TA
1500 I 05 x9035a2 -oYs
o 180-250?
TA

Atct2 2

ol ao-l 704

c:FlD El€cr 47 UF lot.6VDClt

24480

o tao-l 704

alc20l
^1c202

ol 60-o356
ol 40-ol 94

I
I

C:FXOtllCA l8 PF 5t
c:FxD ifca lto +i 5t

28440
72t36

ol6(F0356
RDXI5FIIIJ3C

a 1c203
alc204
Alc205
alc20 6
alc207

5@0-9047
ol 60-ol I I
ol60-2605
ol 50-0093
ot60-31f3

I
2
4
I

C:FXO0.33 t,F." IOI (HANDSELECTED}
c:FxD rtc^ 30?F 5t 300vDcr
c:FXD C€R O.02 r.FD rAC-20t 25VOCta
C:FXD CFR O.Ol trF +80-2Ot looVOCr
C:FXD tlY 2 UF 10t IOOVDCI

28480
t4655
729A2
729A2
84411

5@0-9047
n oil15E 300J3S
5a35000-Y5u 2032
a0l-K8000 I I
663Ura

a lc20 a
atc209
i lc2l c

0 t 60-2605
or40-o20 I
ol 50-oo5 9

I
I

c:FtD cER 0.02 {FD +a0-20t 25VD{r{
C:FXDHICA 12 PF 5X
c:FXO CFfr 1.34-25
PF 50oVDCr.

729a2
2a4AO
7?9a2

5835000-Y5u 2032
ot40-0201
301-ooo-coJo-339c

arc30l
a Ic302
rlc303
Alc 304
Äl c 3 0 5

0t 50-ol2 I
ol ao-0 08 |
ol 70-0040
ol 60-2605
ol 60-082 0

I
I
5
2

c:Fxtl
clFxD
C:FXD
c:FXD
c:FxD

cFR o.t (rF +ao-201 5ovDcI
€LFCT 50 ('F +20-l5i
lOvDCr
rY 0.047 rrF lot Zoovmx
C€R O.02 t{FD+80-?0t 25VDCl
cFR O.05 [,F +80-20t 25YDC|.

56249
5aa2A9
56289
729A2
729A2

5C508I S-Cl,{t09D506C 20lOC2-OYP
192P4739?-P T S
5835000-Y5u 2032
5055 Y5U 5032

atc40l
Al c 4 0 3

ol60-2199 ^
ot to-ooe+ &\

4
5

c: FXD f,tl ca 30 PF 5t 300v octa
C:FXO CER 0.1 UF +80-2Ol IOOVDC9

24480
72982

ol60-2 I 99
8ltl-l00-65I-t

Älc50l
r lc 50?
llc503
llc504

0150_m84/t\/3\
or oo-zz or /\
ol 5o-ooB4-F

o rr o - n nrr$ $

I

c:FxD
c:FxD
c:FxD
C:FXD

rY o.l rF 5t 200vDcr
cFR 0.1
trF +80-20t 1oovDcw
t{lcA 300 PF 5t
CFR o.l trF +a0-2ot lO0VDCi

28480
72942
28480
729A2

or 70-ool9
8r 31-1 00-651-1042
ol60-2?u7
8t3l-loo-651-l
042

ao-l 746
50-o096
80-0291
50-oo50
ao-t t46

alc505

o, to-oo, t Ä\

llc50a
^1c507
llc50?

otan-oril 44
o t e o - o z s rA l {
o r z o - o o z r$

llc9l
rlcF2
rlcr3

l90l-o040
1902-o041
1902-0049

r

:ir-:e-:r-.Sa

\':ti

?
t2
l3
2
3
4

I

3

52
4
I

04z

C : F X t t { Y 4 7 O O P Fl O t 4 0 0 V D C r .

84411

663Uta{7294

c:Fxo Ft EcT I .0 trF lot 35vmr
C : F X D E T E C T1 . 0 U F 1 0 t 3 5 V D C I
c:FxD IY 4700PF l0t 400vDCl

562A9
56?A9
84(tl

l5 00to5 x90r512-DYs
l5o I o5 x9035A2-DY S
663ttvr7291

DIODE:StLICnN 50 ilA -10 t{v
D I O D € : B R € A K D O | ,5i '. I I V 5 I
O I O D E : A R E A K D O6T. N
19V 51

o7 263
o47ta
oaTl 3

Ffrcl088
sz 10939-98
sz I 0939-122

See introduction

to this section for ordering

information

Model 34904

Section VI

T o b l e 6 - 1 . R e p l o c e o b l ep o r t s l C o n t ' d l

Reference HPPart Number
Designation

otv

Mfr
Code

Description

Mfr Part Number

AICR4
AI C R 5
AICR6
llcRT

1902-o04 I
l90l-oo{o
t90l-oo40
leol-0040

DIOD€:AREA(OOTx 5 . t l y 5 t
D I O O E : S I L I C O T 5{ 0 x f o Y V
o l o o E : s t L I C O N 5 0 ilA 30 ry
D I 0 D E : S t t - t C O N t o r|A 30 Lv

o4r13
07263
07263
07261

alcßlol
llcRl02
alcRl03
alcRl04

I 9 0l - 0 0 2 8
t90l-o02 8
190l-oo2 I
l90l-o02 8

DIOD€:SILICOil O.7iA
O I O D € : S lt I C o r a O . 7 i A
D I O D E : SI L I C ( I N O . 7 i l r
D I O o E : S I L I C O NO . Z i A

ot? 13
0+713
o47t3
o{713

sRl35a-9
sRl35a-9
snl35a-9
sRl35A-9

o5
06
c7
o8
c9

1 9 0l - o 0 2 8
1 9 0l - o 0 2 I
1 9 0t - o o 2 a
I90l-o02 8
1 9 0l - o o 4 0

D I O D E : S I fI c o N o . 7 t A 4 o o P I Y
oloDE: Sil-ICoN o.7i
4oopIv
D I o D E : SI L I C O N 0 . 7 5 A 4 O o p I v
O I r | { ) E: - S I L t C O NO . ? i A 4 0 O pt V
otoD€:slLtcor{ 50 t4A ,o rv

or7l3
otTl:l
oa?13
04713
07 263

sRl35a-9
sR1358-9
sRl3ta-9
sR1350-9
FD6l OAa

D t o o F S R F A K D O U ü { : Sl A
t Ln N 1 6 . 2 V
DtoDE SREAXDOTN:18.2V
5t lt
OIODE:SILICOil iO | |l lio ray
o I o o E B R E A T ( D O t t r : 3 3 . 2 v5 t
Ot{lo€ SRF^KOOLit:la.2V5t lt

24480
o4?13
07263
284eO
o4713

1902-0184
sz lt 2t3-2lt
FOGIO8A
1902-0654
szIl2t3-215

a lcRl
alcR I
alcRr
AtcRl
Alcnl

4OOptv
4 0 O pt y
4OOptV
4OOptV

|
I
|
|

szrog,e-ee
FDGIOAs
FDGrOss
FDGlOss

alcRllo
alcßl I I
AlcRt 12
AlcRl l3
AlcRl 14

1902-ot 84
1 9 0 2 - 05 9 4
190 l-oo40
t902-o654
1902-O594

alcRl l5
illcRl16
AlcRttT
AlcRl l8
AlcRl19

1902-o 5 I 4
1 9 0 2 - o 5 59
190 t-oo+o
L902-0654
1 9 0l - 0 2 0 0

oIoD€:zFNER 5.62V 2' tu
D l o o € B R E A T ( D O H i6l :. 1 9 V + 2 t
DInDEISILICO}{iO x fO By
O I O D € B R E A K D O T fa 3{ i. 2 V 5 t
DIOOETSI :l r IOO pR.Ry

2A4AO
o47tt
o726t
2a480
2a4ao

1902{r514
szll2l:Fal
FO€tO8A
1902{t65a
l90l -o200

irlc8l20
rlcRt il
llcRt22
alcßl?3

l90l -0200
190 l-oo40

rcor-@4oA
leol-m4o l\

DIODE:SI3AIOOPRRY
DtoDE:Sil-ICOr{ 50 ilA 30 tv
DIODE:SILICON50 MA 30 Wv
DIODE:SILICON50 MA 30 wv

2a4AO
o7 26t
07263
07263

l90t{)200
FOGI OAA
FDGl(88
FDG1O88

alcR20l
l lcR202
alcR2c3
alcR204

190 l-oo40
I 901-o040
190 l-o04()
1.902-3104

DtoDE:SIttCOtt 50 lt^ 3{! T Y
oloD€!sILICOlt 50 ta 30 tv
otoDE:sILtco|| 50 x 30 LY
DIoDE:AREAXO0Ii5
l .62V 5 l

07261
ot26r
of26t
04713

llcRz ct
AlcR206

|
I
I
|

FDGlOrs
toeroes
FDGlOss
Szro939-l lO

leo t-0040
190 t-q)40

DIODE:SILICON50 MA
DIODE:SILICON50 MA

07263
07?s,3

|
l

FDG|@8
FDG1@8

AlcR30r

1902-O76t

D IODE:8R€A(DO|.N

I
2

a) wv
30 wv

1295a

lNa2l

AtcR40l
AlcR{02
l tcßtc3

I 90 l-oo40
190l.-o040
t902-0o25

DloD€:sttIcoN 50 lt :x) U V
DIDDE:Slt-ICoN50 nA 30 Y Y
DlooE r Bt.EA|(DOft{:I O-oY 51 400 ralt

o7263
o726t
28480

a lcntcl
/rlcR5C2
I lcR503

1 9 0 2 - 3t 9 0
190 l-oo40
l90l-o(xo

D t o o F S R E A K O O T I : 1 3 . o v5 t { ü )
D I O D € 3 S n - I C O l i5 0 ; t l
3o rY
DIODE:SILICOI 50 fl f,O rV

26a80
o7263
o726t

1902-31 90
FDGI OA8
FoGloaa

alcR504
alcR 505
alcRSC6
l lcR5c7
^lcR5 08

t902-3 190
I 901-oo40
190 l-0o40
190 t-oo*o
190 l-oo40

D t o o E E R F I X D O | N :l 3 . o v 5t aoo tr
o t o o E : s I L I c o N 5 0 l { a 3 D t|Y
D I O D E : S I L I C O N5 O x A 3 0 I Y
DIOOE3SI|"ICON
to t|^ 30 tv
DtoDE:Sil-tCOX tO r
:ro l v

2A4AO
o7 26t
07263
o1267
o7263

1902-31 90
FD6tOSA
FD6l OA8
FDGI OAA
FD6lOSA

AICR'G9
AlcR5l0
AlcR5rl
rlcR5l2
llcRSl3

t90 l-oo40
190l.-0o40
l90l-o(xo
190 l-oo40
1902-O049

D I O O E : S I L I C O I {5 0 | | A 3 0 HV
D t n D E S S I L I C O N5 0 t | 3 0 t v
D I O D E : S t L t C O r {t o t A 3 0 y v
D I O D E : S I L t C O t {5 0 H : o I Y
O t o O E : E R E A K D O $6| . 1 9 y , a

o726t
o7263
of26?
ot263
ot7l3

FO6loaa
FDGI088
FOGlOSs
F06lOES
sz 10939- 122

AIJI
l lJ2
AIJ 3

t25t-2Lt4
l25t-?-292
t25t-2292

7t785
TLTA'
7l ?85

252-t8-3(F340
2t2-ta-to-tro
252-ta-to-t50

/rlJ5
tlJ6
lJ7
AtJ6

l25t-2tr..
I 25r-2034
r2 5l-2 I 34
l25t-2tt4

lzxl8t36 CONTACTS
carilNEcroR:Pc E D G Et 2 X l o t 2 0 c o N T A C r
pc
coililEcroR:
l2xl8t36 COI{TICTS
C(x{NECTOR:PCt 2 x l a t 3 6 c o i l r f , T s

7t7A5
7t7A5
7t 785
t1785

252- le-t{F3to
252-t(F3o-300
2tlla-3{F3t{t
252-lE-30-3ro

REI-AY:REEt)
S IITCH: R€ED
S(f,KEr: lC 28 coraTAcr DUAL-ll{tntE
S O C I , F T : l C 2 E CONTICI DU L-II'LtiIE
S ( t r ( E l : l C 2 4 colrlcr

2alr80
2A4aO
28480
28a80
28+60

oa9(H7to
0490-ll05
1200-0469
12(}0-0+69
1200-{)43l

r
l
l
l
l

lrao I
lxao 2
ltPl
lrP2
ltP3
RE er to &ckdating

o{90-o740
o49(Fl lo 5
t20(F046 9
1200-o469
1200-o43 I
Se. Vltl

CONN€CTOR: PC
CONNECTOR:9C
C{}INECTOt:PC

t2xl8t36
ll x lat
tl x lat

cOXTICTS
la c(ltTAcT
la c{tlT^cl

COilNECTOR: PC

I
I
t

See introduction

to this section

for ordering

IYPE
TYPE

|
I
|

FDclosS
FD6lo88
l9o2-O025

information

6-3

Section VI

ModeI 3490A

T q b l e 6 - 1 . R e p l o c e o b l eP o r l s ( C o n t ' d )

Reference HP Part Numbel
Designation

Description

Mfr
Code

Mfr PartNumber

24a80
24480
26t60
28460
l7ll7

t2OO-O473
120(F()t74
0340-o060
o3a(Foo60
,56-23t-5

lTll?
05820
05am
2AlAO
28+AO

t'66-235-5
2O7-CB
207-CB
1400-0760
l4(xFo760

AlflPa
rl||PS
l liP6
tlfiP?
A ITPS

1200-0473
1200-o4?4
0340-o060
0340-o050
1200-o4_t?

l lltP9
altlPlo
ll||pll
^l||Pl2
a lxPl 3

1200-o{!t 7
12{)5-o03:l
l20Foo33
1400-o?60
l{oo-o760

AlPl
^tP2
alol

L2tl-7231
t2rL-1236
l8 5i-ool o

I
I
I9

C O N N E C T nS
RI R I P : l 4 - P I t {
C O N N F C T OSRT R I P : I 8 - P I i l
T S r R : S t P i l P T S E L E C T EFOR o f { 2 i l 3 2 5 1 |

28480
?alao
2A480

t25t-t2ta
L25t-:Jzt6
ta53-oolo

^lo2
Alo3

1854-OO7I
1 8 5 4 - O O 7I

47

r s T R , : s t i t p t i l s E L E C T E DF R O I { ä t 3 7 0 + l
T S f R : S l I P N I S E L € C r E OF R O x 2 N 1 7 O 4 l

28480
2e4AO

la54-oo7l
l85t-OO7 I

a lolol

l8q-0569

TSTR:SI

NPN

2A4aO

la54-0569

^ lo
rlo
Alo
llo
a lo

lo2
lo3
lo4
lo5
loe

1854-OOa7
l8 5a-ooa7
la 5t-oo5r
l8 53-OOa6
la54-oo? I

TSTR:SI
TSTN,:ST
TSTR:ST
TSTN,:ST
TSTß:SI

NPI{
NPN
PilP
PNP
NPNISFI.FCIED FROII

80t 3l
8013t
ool 3l
aol3l
2raeo

2||tltr
2lt34l7
2N40t7
2t5047
184-O07l

aloloT
Alotoa
llo lo9
alollc
aloll I

la54-o569
la 53-oo86
l8 53*0086
I A5{-O03 9
l8 54-OO19

TSTR: S I
TSTR:SI
ISTR!SI
rSTR:SI
TSTR:SI

IiIPN
PI{P
PNP
NPN
NPil

2E4AO
8 0 13 l
aot3l
801 3l
aol 3l

1.854-0569
zil5087
2r5047
2N1053
2il3053

loll2

I 854-OO7I

rSTR.:SI

NPilISELECTED FRol|

an3?o4|

23tao

1854-OO?l

a lo20 I
^to202

I I 5 3 - O Ol O
185+-O2l5

TSTR:SI
TSTß.: Sl

PNPISEt€CTEO
tilPil

?'tt2Stl

28tAO
80t31

la5:Foolo
2N390+

I to203
Alo?o4
ll o20 5
rIo20€
llo20 7

l8 54-O2l 5
la55-o093
la55-o(xr 3
1855-OtO8
r855-O308

aoI3t
28aao
264AO
24480
2A4aO

2N3904
1655-0()93
r855-O093
1855-0308
1855-0308

l 1o208
llo209
tlo 2lo
llo2lt

1855-O09t
1855-O4lO
l 8 5 3 - O O lO
l8 54-02 I 5

2a480
2a{ao
28480
80131

1855-OO93
la55-o+10
lo53-o0 lo
2N3904

r lo30 I
A lo 302

t85+-OO7 I
t8 54-OO7I

ISTR:SI
rSTR,:Sl

NPN(S€LECTED FROI{ 2N:}?O4I
xPN(SELECTFD FRox ät3704l

2AtAO
28aAO

laSa-oo7 I
I A5a-OO7l

llo303

ta'1-0475

TSTR:SI

NPN

28aao

I A5.r-O47t

llo40 I
Alo4('2
llo403

l8 53-OOlO
1854-OOA?

TSTR: SI
TSTR:SI
TSl8.3SI

PNP
PNPISEI-€CrEO
llPN

8013t
28tAO
aol3 1

zil4906
I 853-OOl O
2Nj,4t7

^lo{o4
alo4()5
^ loao6
llo{o?
llo40 8

l8 5l-oo lo
1854-OOa7
185t-oolo
185+-O08?
ra:r-ooae 7$

TSf R,: SI
TSTR:SI
TSTR:SI
TSIR:Sl
fSfR:Sl

P}'PISEL€CTED
NPT
PiIPISETECfEO
taPN
Pl{P

Fn,ot är325t l

2A4AO
aol 3l
2AaOO
8 0 13 l
80131

I 853{)Ol 0
2N341?
1853-OOIO

Aloao9
ll.o {l c
llo{l I
r lo4l 2
l lg4l 3

I 8 5 3 - O O lO
l8 54-0087
1853-OOIO
Ir54-OOa7
I 853-OOt O

ISTR:SI
fSTR:Sl
TSIR:SI
ISTR!Sl
ISTR:ST

PNPISELECTEO
IP||
PilPISELECT€O
tlPN
PilP(SELECTED

FROX 2it325l I

28t80
EOl3l
2A{80
80131
2A480

1853-OOIO
2N341?
1853-OOtO
2il!r417
t853-OO10

llo4l4
r lo{15
lloat a
l lo4l 7
llo{l I

la54-ooa7
I 8 5 3 - O O lO
Ir 5+-OOA7
r r53-ool o
Ir 54-OOA7

TSTR:SI
TSTR:SI
TSIR:SI

NP'{
Pl{P.SELECfEo
IPri

tSlR:SI

NPa{

ao l3l
28{80
ro l3l
2e480
a0l3l

2N34r?
1853-OOtO
2N3417
1853-OOl O
2N3417

/rlO42O
llo42 I
^ lo{2 2
rlc423
r 1042.

la5:t-ool o
It54-OOa7
l 8 5 3 - O O lO
l8 9a-ooe7
l8 53-OOl O

lSTL:Sl
TSIR3Sl
TSTR:SI
rSTR:SI
fSrR:Sl

PllPlS€LECIED
liPN
PiIPISELECTED
TPX
PttP{SEtECTEO

2E480
aol3l
2Atao
8{tl3l
26tAO

la53-oolo
2N341?
la53-ooto
2il3417
1853-OOIO

:

€ -.!

oty

itt

rasloora A

b R+.htiql

Se

Vill

20
t7
20
14
2
2t

2
t7
I
5

2

9

9
5

I

1

S(f,,XET: lC l6-PlN
soc(ET: lc l4-Pta{
FEEOTHRU : IilSULATEO
FEEDT}NU: INSI'LATEO
S'trKET: IC 8 PIN

X(l.lNT IilG
Tfl.|'{TING

SMKFI:IC
8 PIN
H€AT SI N(:SEtlICOil{XrCToR
HFAT SI XK:SETICOI{ü,CTOR
CLIP:I{flJilTING
ASSYISE
CLIP:l{(]u||rlNG
ASSY(S€I

OF
OF

FROr

3l
3l

^tttoll

ISTR:SI
NPII
ISTR:FET N-CHANNEL
ISTR:FET N{HAXilEI
rSTR:SI- NPil DUAL
TSTR:SI
ilPil OUA[TSTR:FFT iHI{.IINEL
TSTR: F€I
rSTR:SI
PNPIS€l-€CTED FROI
rSTR:SI
NPiI

2it325t I

FROil at325l )

FRO|( ä{ 325t t

FROil är325ll
FROI| 2N3251I
FROft 2X3251 I

r s r R : s t P l r P t s € L E c T EFROil
o
2r{3251 t

See introduction

FROX at325lt
FROX ar3251t
FROI at325l I

to this s€ction for ordering

information

2r|:r4r7

2N3906

Model 34904

Section Vl

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n r ' d I

Reference HPPartNumbet
Designation

atv

Description

Mfr
Code

Mfr PartNumber

Alo42t
Aloa26
^to127

l8 54-O087
l8 t3-oo lo
r854-O087

TSTR: SI NPl{
f S T R : S l P i t P l S € L € C T E DF R O ü ä { 3 2 i 1 t
TSTR;SI NPN

aol3l
28tAO
aol 3l

2tt34l?
1853-OOl.O
2N34t7

A lo50 |
^to50?
llo503
llo50a
alo505

1853-OO:t6
l8 53-0036
ta54-o2t5
l8 54-02l 5
l8 54-02 I 5

ISTR:SI
TSIR: SI
TSIR:SI
lSfRrSl
TSTRsSI

PNP
P'{P
NPiI
NPN
NPN

ao13l
80l3l
80l3l
80131
aol3l

ztrrt906
?N3906
2N39()4
2N3904
2l{390a

Alo506
rlo50?
A 1o508
llo509
a loSt 0

tESt-o24,
ta5r-o235
1854-02l 5
ta54-o221
la54-02 t 5

TSTR:SI
fSfR:Sl
TSTR:Sl
ISTR:SI
TSTR: SI

PNP
PilP
NPN
N P N ( R E P L . 8 Y2 N 4 O 4 4 I
NPil

2A4AO
24480
8 0 1t l
2a480
60131

LASt-O2t5
I 853-023 5
2N3904
l8*-o2zl
zilt904

^lo5ll
llo5l2
A10CR301

L85t-O2t5
1854-OO7I
5060-60d)

I

alßl

()6a4-l 53 I

39

AI R 2
l lR3
^lßa
Äl R 5
AlR6

06a{-l
o6a4-l
0684-1
0684- I
0684-1

ltR ?
llnS
llß9
rte lo
llRll

06A4-22t1
06a4-??31
o6a4-2211
068/.-2231
o6a4- l23l

alt t2
llR l3
^lß la
rlR l5
rtR16

06a4-332 I
(}6a4-3331
0684-3331
06a4-6821
06a4-333 I

tlRlT
a lnla
llRl9
AIR20
llß21

0684-lO2 r
0684-l 531
o6aa-l 53r
0684-l 531
0684- I 5:|l

AtR22
rlR23
a ln2a
ltR25
AlR26

0684-l
06a4-l
06a4-l
o6a4-l
06a4-l

3
I

TSTR: SI P'IP
TSIR:SI NPiltSELFCTEO
FROI|2fl170+l
REFERENCE
AMPASSY:INCLUDES
R306,3@, 310,313,314.315
R : F X D C O ' 4 Pl 5 K O H t { t o f l / 4 t a

2A4AO
28480

la't-ozr5
I854-OO7l

28'l8O
oll2l

5060-6(D0
c8 l53l

R:FXD COIP 15|(
R:FXD COXPl5K
R:FXD COt'tPlt|(
ß:FXD COXP l5t(
R:FXO CnfiP I'K

OHr{lot
OHt lot
oHt| lot
(I{t lot
OHr| lot

l.r4l
l/4ta
l/4r
l/41
l/4r

oll2l
oll2l
oll2l
olt 2l
oll2l

c8
c8
c8
ca
c8

I
I
I
I
r

R:FXD COIP 22K
R:FXO COI.P 22t(
R:FXD COIiP 22r
R:FtO COIiP 22|(
R:FXD COXPl2K

O t { t 1l o t
OHfi lot
OHfi toz
OHt| LOt
(}tt lot

l/41
t/4t{
lt4u
tt4Y
t/{l

ol l2l
ol l2l
ol l2l
oll2r
ol l2l

CE
CE
CB
CB
ca

2?al
2231
22tl
2ztl
t?3t

R:FXD COXP :l3OO Olit tol l/{f
R : F X O C O , . P3 : t t o H l t l o t 1 / 4 r
R : F X D C O X P3 3 R O H I { t o t l / 4 t l
R:FXD COnP 6.8K Olil rot l/4|a
R 3 F X DC O d P 3 3 X O H r r o a l / + l

oll2l
oll2l
or l2l
oll2l
oll2l

ca
CB
ca
CE
c8

3t2l
3331
3331
6a2l
333t

R:FXD COftP tooo otta loa
R:FXD CO,|P ltt( OHt{ tor
RIFXO COtlP l5K OHat LOt
R : F X D C O t a Pl 5 K o H l t l o t
R:FXD COiP I't( OHralot

Llt*l
tt4t
l/{r
l/41
l/4r

0rr2l
ol t2r
ol l2l
orl2l
olr2l

c8
CE
CB
CA
CB

I 02l
l5tt
I 531
l53l
I 5:rl

531
53 I
53 I
53 I
53 I

R:FID COI|Ptt(
R:FID COtaPI'X
RsFXO COftP I'K
R : F X D C O H P1 5 l (
R:FXD COXPl5K

OHt lot
OHtr lot
OHfl IOZ
O H f al o r
OHX lot

l/4r
l/4|.
tl4|/
1/4I
l/4r

ot l2l
oll2l
ol l2l
oll2r
0rl2l

alß27
AIR28
AIR29
A I R3 0
llR3l

0684-l 'f, I
068+-1 53 I
0684-l t:rl
068(-l 511
o6a4-l 53 I

R:FXO COrP-I5|(
R : F X 0 C O , i Pt t | (
R:FXD COXPl5K
R:FIO COIiP I'R
R:FXD coxp rtr

oltx lot
OHX.lA!
OH)t tot
OHrl 10t
olr"l lol

l/4U
l/41
l/41
t/4t
t/tr

OII2I
oLI21
olI2l
0tl2r
01l2l

C B I t3l
C B t 531
c8 I t3l
ca l 5 3 l
c 8 I 531

rlR32
tlR13
IIRH
tlR35
rlR36

{)6a+-1531
075?-O469
0757-Oa65
0684-6A2t
0684-6A21

R:FXD COrP I'K OHX lol l/41
R:FXO Ft-ft l50K oHfi tt l/81
R:FIO tl€T FLX loo(. Olil It l/ar
RIFXO COraP6-at( ottt tot l/4r
R:FXD CorlP 6.8{'O}fa lO: l/ir

oll2l
2A480
28460
oll2l
ol l2l

c8 lt3l
o757-0+69
o7r7-{J46'
ca 6a2l
c8 6821

AIR37
llß38
^1R39
^IR40
AIR'I

0684-682 r
(}6a4-6A2 I
0684-6a2t
0584-682 I
o6a4-682 I

R:FXD
R:FXD
R:FXD
R:FIO
R:FID

CO||P 6.E{
COI|P 6-8(
C0rap 6.a(
CO,iP 6.8(
COre 6.ax

Orit
Ol||
o}[
Ottt
oilt

lo:
lot
lot
lot
lo!

l/{l
l/4r
l/{ta
l/ar
l/4ra

oll2l
ol l2l
orl2l
or l2l
ot t2l

ca
c8
c8
ca
ca

AIR+2
tlßa3
aln{a
llr45
rlt{6

068t-682
06a{-682
o6a4-682
068+-6a2
o6a4-5A2

R:FIO
R:FXD
R:FXD
R:FXD
R:FXD

COI|P 6.8(
COI{P 6.8K
Cotap 6.8X
COttP 6.8(
CO,.P 6.AK

Olft
Oln
Olfi
Ottl
Olft

tot
lot
lot
lot
loa

ttry
l/al
l/41
l/tl
l/at

oll2l
ol l2l
ol l2 r.
olt2l
ol 121

CE 6g2l
c 8 682 I
c8 6 8 2 t
ca 6821

rlta?
^lRa€
rtt49
tlt50
lln 5l

058a-6a2 [
068+-6E21
06aa-6821
0684-6A21
o6a4-6821

R:FXO COiP 6.8t(
R:FXD CO||P 6.8{
R:FXO COraP6.8(
R3FXD COtrP 6.8(
R:FXD COraP6.8X

O}}t
o}|l
Olil
Otft
Oltt

tot
l0:
lO:
10t
IOt

Llil
l/4tt
l/4t
l/4t
t/{l

oll2l
oll2r
oLl2l
otl2l
otl2r

c8 6A2l
CB 6621
cs 642 I

llt lo!
rll to2
llnlo3

o?5?-O+3a
o7t7-(l438
o75?-o:t92

28680
2g4AO
2A4EO

ot57-o438
o?57-O+38
otSt-or92

531
531
53 I
53 r
53 r
9

6
tl
7
7l

I5

I
ll

I
I
I
I
I

6
I

R:FXO ilET Fl_ft5-llx
Otr lt lr8ta
R:FXD rFT FL,t 5.llx
{Hx lt t.r8l
R:FID iET FLra T3.2 olt lt t/8t

See introduction

to this section

for ordering

531
531
531
531
t3r

ca I t3l

ca I 5:t1
co l S t l
c 8 I 531
ci lt3t

6821
6AZl
6A2l
6A2L
6 821

C8 5A2l
c8 6A2l

ca 6A2l

information

6-5

Section VI

Model 3490A

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s { C o n t ' d f

Reference HPPartNumber Qty
Designation

Description

Mfr
Code

Mfr PartNumber

alR l04
Äl t l o 5
alRlo7
alRto8
alR l09

0683-O335
069A-3264
o69A-4474
o6a4-2721
o757-O429

2
2
2
4
2

n , : F X OC O f l P 3 . 3 O H i l 5 l t l 4 y
R:FXD FLll ll-aK Ot|I lt l/8t{
R:FXO FLX Aa5O OHll lt r/8r
R:FID Cof{p 2700 olri lot l/4t
R:FXO HEI FLir 1.82X OHil lt l/al.

ol l2l
28480
284A0
ol t2l
28480

cB 0335
0698-3264
o69a-4474
c6 2721
o757-O429

alRIto
a l Rl l I
alRll 2
alRll3
Ä l ßl l 4

o75Z-O44t
o757-0709
0 6 9 8 - 3 25 9
o757-O44?
o757-0442

1
I
2
l2

RIFXD ü€r FLI 8.25t( (Hä lt l/aU
R:FXO XFT FLf{ 68.I Orfi l: l/4ta
R:FXO FLr't7.87K Ol*{ lt l/8r
R : F X O n F T F L X L o . O ( O H l , tM / 8 t l
R:FXD X€T F(H lo.OK O.tft lt l/aH

28480
284€O
28+80
28480
28480

o?57-0441
o?5?-0709
0698-3259
ottT-o+12
o?57-0{42

alßll5
rlRlle
A I RI I ?
alRll I
alRlt9

o757 -O4+2
0 6a4-2221
06a4-191 I
0683-O335
o6a4-4ll I

I5
t

R:FXD ri€t FLat IO.O( (}ttl 1! l/8r
R : F X D C O I { P2 2 0 0 o H f t l o t t / 4 1
R:FrD COtp !t90 0Hll lot l/4H
R I F X D C O t a P3 . f O H l r 5 Z L t l | t
R:FXO COrP 4?O OHtl lot l/41

28480
oll2l
0 11 2 1
ol l2l.
oll2l

o757-O442
cB 2221
c8 39ll
cB 0335
cB 47ll

llRl20
alRl2l
ltr 122
alR123
A I R1 2 1

0684-4731
06a4-2221
o6a4-2721
0757-O429
0757-O441

R:FXO Cnt |P47K OHx lot I/4t{
R : F X O C O , | P2 2 0 0 o l $ t l o : t / 4 1
R:FXO COXP 2700 0tt1 lot t/4ta
n:FXD rFT FLfi l.8a( (}{t.t lt t/Ar
R:FXD ttET FLlt 8.21( r}tH lt l/81

oll2l
oI I2l.
otl2r
28480
28480

ca 4731
cg 2221
cB 2'IZl
075l-0429
0757-O.Al

alR12t
^ l R 1 26
atR127
!lR 128
Al R 1 2 9

o757-07t I
069A-3259
0757-M42
06a4-2221
06 a4-l al I

R:FXO XET FLX 82-5 ollt lt l/41
R:FXOFLX 7.87K OHI lt l/8r
R : F X D l t € T F t _ r 1l O . O ( O H n l t l / 8 1
R : F X D C o | | P 2 2 0 0 O H r al O ! 1 / 4 1
R;f.xD coHP lao oHt{ lot l/4r

2A4AO
24180
2A4gO
0rl2l
ort2l

o?57-07l I
0698-32 59
0757-O412
ca 2221
c8 l8rl

AIRI3C
alRl3l

069A-447 1
0757-O271

R:FXD FLü 7.15K Ot{t{ ll l,/8t
R:FXDXEI FLt 3.01K OHI lt r/8H

28480
24t60

0698-1471.
0757-O27t

alR20I

0684-l 53I

R:FXD COIP l5K OHt lot

olL2l

ca l53l

a lR202
rlR203
r lR 204
alR 20 5
AIR20C

0184-472L
o6a4-lo2 I
0684-33?I
0 6 8 4 - I O 2I
069a-3t55

25

oll?r
ol l2l
oll2l
olt2l
28480

c8 t72l
ca lo2l
ca 3131
cB l02l
0698-3 I 55

Ä 1 R 2 07 toP 0601
A I R 2 0 ? (oP 0501
^ l R2 0 8
alR209
AlR2Ll

069A-45 t O
0757-U+65
0757-O448
0757- O+48
o7t7-o442

2

R:FXO nET FLX 84.'( fX.tt lt l/8r
R : F X O r , r € TF L X l o O K O H X l : l / 8 1
ß:FID rtEr Fl ü la. A( (xtr tt 1/8r,
R:FXD ||ET Ft_ä la.z< ot{fi lt l/8r
R:FXO N€A,"FL| lo._o( o{}l tt l/sr

24480
28480
28480
2A4AO
28480

0698-4tt. O
o757-0465
o757-04.48
O757-O..1A
O757-(}.42

a lR2l 2
AlR2l 3
a lR2l {
A I R2 1 5
alR2l 6

o75l-u42
0598-3?79
0698-451O
0698-451 O
o?57-0465

R:FXD
R:FXD
t
R:FXO
R:FXO

ilET FtX 10.0( oHft lt l/8tl
lilFf FtX..{t9O OHX lt lr'8l.

28480
2a4AO

0757-'J412
0698-3279

il€T FLt 84.5X OHil lt l/81
XFT FLft IOOK OHfl lt l/Et

28480
2A4EO

069A-45 I O
o?57-()465

ÄlR2l7
Äl R 2 l 8
Al R 2 t 9
A l R 2 20
^lR?2 I

075 7-0401
0698-3?OO
0698-0O77
o6a4-472L
0684-l 53 I

RIFXO t{€T FLI IOO O]tr{ lt t/8r
R I F X O F L t 7 1 5 .O H t (t t l / 8 1
R:FX[ fi€f FLX 93.IK OHtt l? l/8il
R:FXD COf{P ITOO Ol+l lot l/.rl
R : F X O C O I I Pl ' t ( O H t l o t l . / 4 X

28480
2A4AO
28+80
otl2l
oll2l

o?5?-o401
()698-3700
069a-0o77
ca 4721
c8 l53t

^tR222
^t9.221
alR224
A lR 226
^IR22 7

0684-472 I
06a4-l 23 I
o698-4474
o?57-0401
o68t-l 541

R:FXO COI{P 4700 0rS{ rot l,r4ra
R i F X D C O X Pl 2 X O H t l o t l / 4 1
R:FXDFtH 8450 oHH It l/8r
R:FXO tET FLfl IOO OHH lt l/8ta
R:FXD COIP I50K' Ol$t toz Lt41

olL2l
ol l2l
28480
28+80
oll2l

cs 4721
cB l23l
0694{47(
o?5?-o401
c9 l54l

arR30I
alR302
AlR303
Al R304
At R305
A1R36
A1R307
AI R3A
A'IR3@
A' tR310
^n3li
lln3r3
^ lR3l4

o757-02a0
069a-i457
oal l-o92 0
0Bl1-13(}5
0698-451I

2
1

28400
28t80
2A480
28480
2a4a0

o75t-o2ao
069A-f4t7
oa I l-0920
0811-1335
0@84518

0757-@39

1

RIFIO nET FLt lK (){r lt l/Or
R 3 F X Dl t E T F L r 3 l 6 K O t { t { l t l / E r
R:FXD ty l?OO OHll 3t 3ta
R : F X D W W l l K O H I M3 % 3 W
R : F X D F L M 1 3 7 KO H M 1 % l / 8 W
sEE 410CR301
R: FXD iilET FLM 6.81K OHM 1% 1/8W
sEE AlOCR3oI
R: FXD MET FLM 8.25K OHM 1% l/8\ry
sEE A10CR301
R:FXO FLä 80.6K Olil lt l/El
s E EA 1 0 C R 3 0 1
sEE A10CR301

?
5

A

I
3

I

2

2

t
I
I

l3

?
I
I

0757-0441
0698-4509

I

^lP3l5
lla3lG
llFSlt
^lt 3l 9
r lt 32c
rlrt:l
: :+t

3 i*d{nE

RIFXD
R:FXn
R:FXD
R:FXD
R:FXD

l/4ta

CO|,IP47OO Ofrt tot l/{r
C O H Pl O O 0 0 1 f f l o t l / 4 1
C O | { P1 3 K O H t l o t l / 4 | |
COttP IOOO Oftt lot lltaa
ftFT Ftx 4.64{ r}tfa lt l/8r{

28480

07570439

284f,0

o757-U41

28480

069A-4tO9

2A+AO
28480
28480
28480
28{80

08 ll-3rt
r
oall-ttt3
069A-1279
o757-O391
of57-0316

sEE A10CR301
oSll-ar73
oStl-tl7f
698-3219
075?-039I
07 5t-o3a6
sa vlll

I

I
3

R : I I A T C H E DS € T W I T HA 1 R 3 1 8
R : I i A T C H E DS E T W I T HA 1 R 3 1 6
R:FXO tET FLt +990 olf,t l! t/8r
RrFXD FLr 39.2 OHr{tt ttSU
R : F X Df t € T F L | l l 0 ( H I l . / 0 a

see introduction

to this section for orderins

information

Model 3490Ä

Section VI

portslCont'df
T o b l e6 - 1 .R e p l o c e o b l e

Reference HPPart Number oty
Designation

Description

Mfr
Code

Mfr PartNumber

tlnaol
^üa1{J2
tlßao3

06s4-4721
o6a4-4721
0684-l 53 I

R:Fxo Coftp 47oO Or|I lot t/.|a
R:FXD COI{P 47OO O}t{ lot l/{ta
R:FX0 Coäp 15(' (x{lt lot t/af

ol l2l
oll2l
oll2l

cB +?21
cg 1721
c8 t53r

llRao{
rlrtoS
rlß4{'c
rlß/to7
alß{o8

06444721
068t-l 541
068{-l 53 I
0684-472 I
0684-l 541

R:FID
R:FXD
R:FXO
R:FXD
R:FXO

COilp 47OO O}}t rot l/{l
COIP 15il Orfi lot t/4r
CO,|P l5K OH|| lot l.rtl
Corap +?OO Otfi lot l/4t
COIIP l5O( Ottl l'l
ll..f

oll2l
oll2l
ol l2l
ol l2l
oll2l

ca
c8
c8
c8
cB

1I2l
l5+t
l53l
+721
l54l

alß409
alRal o
tlRall
!l lRal 2
tlß41 3

068+-l 531
o6a4-{721
0684- I 541
o6a4-4721
o6a4-4721

R : F X D C O f t P t 5 K O H t at o t l r a t a
R:FXO COI|P a700 olft lot Lrfl
R:FXD COnP ISOX ol{t lO! l/4r
R:FXD COI|P ttoo ot|t tot ttte
R:FIO Cotlp 4tO0 Olti lot l/4r

o l l.2l
otl2r
oll2l
oll2r
oll2t

c8
ca
c8
cg
cs

1531
a?21
l54l
1t2l
a72l

tlRata
rln41 5
tlnal 6
I lRal 7
l lR4l 8

o6lt4-l5a t
o6a1-1?21
068{-l 54 I
o6a4-153 I
o6a1-4721

R:FXD Colrp lsR OH,| lot l/4tl
R:FXD COfiP aTOO Orfa tOZ tttü
R:FID COHP lt(x
olil r0! 1/41
R:FXD COxp t5t( $tt lot l/4r
R:FXD COfrP 4700 0lr| lot l/4r

oll2l
oll2r
olr2l
olt2t
0lt2l

cB
c8
cB
c8
c6

l53l
'rt2l
l54l
l53l
a72l

llt/u g
rtRa20
llta2 I
att,122
tt?423

0684-1541
o68+-t 531
o6a4-1721
06a4-t 541
0684-l 51t

R:FXO Cofap ItOK Oltt IOa l/4{
R:FXD COilP lt( OHl| lO: l/4r
R:FXD CO,.|P47OO Otft tol tt,*a
R:FXD CO|P l'(X Ot|t lot l/41
R:FXD COtiP l5x ol$t lol l/tl

oll2l
olt2t
oll2l
0ll2t
orl2l

ca
ca
c8
ct
ca

lStl
l53l
r?zl
lt41
l5tl

at&{2a
llR425

llRa28

06a4{721
068a-l5al
o6a4-l 531
0644-4721
0686-1 541

R:Fxo CoxP t?00 Or|t lot l/{l
RIFXD COI|P 150( olfa l0l l/41
R:FXO COtlPl5x oHx lot l/ar
R:FXD COXP t700 ol|| lot l/{.
R,:FID COa{pl'(x
otft tot l/ar

oll2l
oll2r
oll2r
ott2l
ol l2r

c8
c8
cB
c8
cB

4t2l
lt4l
lt3l
+721
t54t

irlR42 9
llR{30
llR4:t I
^ IR432
^lR13 !

2too-"zr7
o6i4-3e31 lil
o6a4-l 53 I
0684-472 I
0684-5621

R : v ^ R 2 0 ( O H t al o t
R : F X D C O | I P3 9 K O H X l o t l / t l
RtFxD COr'lPl5X o}|x lot l.rar
R:FXD COXP 1700 0H. lot t/4r
R:FXO Cotap 5.6( O|0a lo! l/4ta

2Aaao
otl2r
oll2l
oll2l
oIL2l

2loo-t2t7
c6 3931.
ca t 53l
cB t7?l
ca 5621

^1R43/t
rltat5
alna3 6
It*a37
rlRt3r

06a4-l 54 I
o6a4- t 53 I
0684{?21
0684-l 541
0684-l 51 I

R:FXD CO,IP I50f, ol|. lot l/{r
R:F,XD COfaPI'f
0a{'| lO! l/4ta
R:FXD CO||P iTOO Olfr lo! t/tl
R:FXO COXP t50( olt{ lot l/41
R : F X D C O f t Pl 5 r o H r l o ! l / a L

0 1l 2 t
or l2t
oll2r
ol l2l
ol 121

cE
c8
cB
cB
cB

t5al
l53l
+t2l
lSal
l':tl

llR439
/rlna{o
llt+41
a tß44?
rlR{43

o6a4-4721
0684-l 5al
o6a4-l 5:t I
0684-1?21
06a{-l t{l

R:FXD
R:FXO
R:FXO
R:FXD
R:FXD

oll2l
olr2l
oll2l
otl2t
oll2t

ca
cB
c8
ca
ca

1721
t'al
r53l
t72l
l54t

llR444
AIR.45
alntaa

0757-0472
0757-0455
0684-l 531

2

R:FIO tEr FLx 2oo|( ot{1 l! val
ß:FXD HEr Ftt loo(.aüfa lt l/sl
t:FxD co['|P l5x oHfi Loa tl4['

2A+aO
28{AO
olt2t

o?t?-(ta?2
olt?-ot6t
c8 t53l

a lt50 I
a tR 502
llR 503
ltR 50a
tlß 505

0698-4+9t
o757-O{41
0757-O27:t
o75f-04'l
o?57-O453

2

R:FXD FLil
R:FXD ||EY
R:FXD xET
R:FXD rET
R:FXD rEr

35.7K OHt
FLli E.2t(
FLt 3.Ol(
FLX 6?.t(
F[x 30-tK

l/sL
lrSl
l/al
l/sr

26480
28480
28480
2e460
28180

0698-t494
o?5?-o441
o7t7-o27,
o?5t-o+57
o?t?-ortt

^ lR 506
AIR'O?
atR5{t9
rlRSlo
^lRSllA

o?5?-0453
075?-O4t3
069H496
0698-4496 ^
0698{4264

R:FXD rEr
R:FXD flET
R:FIO FLr
R:FXD Ftfi
R:FXO FLt

FLt| 3O.lK tr{l| Lt l/Et
FLr 30-l.x tltft lt l/a|.
4t.3t( Olil It l/8ll
45-3t( 0tft lt l./8r
1580 oHft lt l/al

28a80
2AaAO
28480
28tEO
2At80

0757-Or5t
ofSt-o15t
(b98-aa96
0698{a96
069a-a426

rlR5llB
lll512
llt 5l 3
lln 5la
rlR 5l 5

()69E-3497
0698-3179
o757-Oa65
o757-0465
069A-+{9a

2
I

R:FXD FLr
R : F X OF t X
n:FXO |.El
I:FIO ||ET
R:FXD FL||

6.0.t' O}|| lt l/al
?550 oH|| lt l/81
FLt IOOI, ot{t lt l/gl
FLt lOOr OHI lr lrar
3t.7(
O]l| lr l/Ata

284AO
28480
284aO
28teo
2t4ao

llR 5l 6
rltSl?
^ln5l E
llt 5l 9
a ll 520

0698-at97
0698-31?9
0?5?-(16t
o?5?-0+65
069A-449{

0698{t99
o698{a99
o75?-0+65
ortr-ozoa l$
075?-o38S

2

R:FID
n:FxD
R:FXD
IIFID
R:FID

5a-9t olt lr l/sr
ta-9( Olil lt l/sr
FLt loof, oltt It l/sl
Ftt 2-OO( Olli lt l/e
to.l oHft lt l/ar

2aaEo
2A{AO
2A1AO
2t180
28tEO

llR52t
^tt522
lll 52 3
ru 524
lll 52 5

069A-!r99
0698-+499
OltT-Ot6J
o?5?-02a3
ot5?-o3aa

0757-O388
2loo-32?O
o757-Oa{6
o75?-(y|46
oere-o:zt$

28r80
2rtEo
28aeo
2a480
2AtAO

0?5?-o388
2loo-32?o
o?51-oa{6
o?t7-(x46
06te-6324

aterei
aln{z?

.t Rst bB*dritESaVllt

7
I

5

2
lo

2
I

2
t

a
I

COIiP 4?O0 otfi tol Ltrd
COI|P l5(X oll
l0! l/4r
COtrP t5t ()ttx lol t/{L
CO||P +700 otft lot l/4r
COXP Itfi
Orfl lot l/i|a

Ftt
FLt|
ftET
||Ef
Ft-ft

lt l/8Y
Ot{i lt
lr{'t lt
O H r al t
Ot'l lt

R : F X D F L t 3 0 . 1 O H t al t l / 8 I
R:VAI CEnl|CT loo (ltt toa lrzy
R:FXD tET FLX lt.o(
OtX lt l/AX
(}tt lt l/6I
R:FIO llET FLX lt.(x
R:FID FLä la7 {}|t la lrSr

See introduction

to.this

sction

fot ordering

information

Model 34904

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Mfr
Code

Mfr PartNumber

28480
28480
26480

075f-ot46
0698-4196
o?5?-0346

ol 295
28480
o47 13
01295
01295

sN?404N
I 820-O798
t1c4024P
st{7474N
st't?493N

ot2e5
ol 295
12040
28480
01295

sil7474N
sN3543I
Lr{71lc
lAlA-2055
s$1740+N

OUAL D F/F
4-AIT
BINARY COUNTER
INPT.AiIO OR GATE
LP 4U '-2-2-'
DI,AL O F/F
8-INPT T.T,LTIPLET€R 9/€NABLE

o1295
ot295
l2 040
o1295
01295

sN?474N
sx7493N
Dtt7at54t{
sN?474N
sit?4 t5lli

I

LT!t{ POI{ER I OF I6 DFCODFR
IC:TTL
IC:TTL DUAI D F/F
Ic:TfL
tP 41 1-2-2-t
II{PT.AO
OR GATE
{UTTIPLEIER 9/FNA8L€
IC:TTL 8-INPI
TC:TTI. DTIAL D F/F

07263
o1295
L2040
o1295
o1295

u6N93l" I I 59X
sN74?1il
DX7{L5{N
sl{?4151N
sN?4?41'l

I

TC:TTL
IC:TTL
IC:TTL
IC:TIL

ol?95
ol 295
12 040
ol 295

sN?4l9:!N
sN74?4N
Dlt74l-o4N
sN?4I5l l{

Reference HPPartNumber oty
Designation

1

Description

R : F X D } t F T F L } t I O t}t|{ la
f l : F x D F f L l . O T K o|r{ l.ol
R : F X f } I { E T F L i ' I O (I{N tt

t/&a
l/8t
l/8ta

lrR52{
AIR52?
alR52€

0?57-0346
0 6 9 8 - 4 19 6
o757-O746

llut
AIU2
^ lut
Äl u 4
Ät u 5

l8 20-o5t r
1820-O79 8
r820-o567
1820-oot7
la2 0-oo9 9

AIU6
AIU?
^ lu8
^ lu9
alulo

t8 20-o0 77
1 8 20 - o 7 88
t820-ol25
l8l8-2055
lB20-o I 74

AlUll
AIUI2
lul3
Älul4
AIUIS

I 8 2 0 - O O ??
182()-O099
la20-059 r
l8 20-o077
ta2r)-o622

A I UI 6
AIUIT
AlulS
rlu l9
Äl u 2 0

la2{)-o702
I 8 2 0 - O O 77
la 20-o59 l
ta20-o622
la 20-oo 77

AI U 2 I
Atu22
AIU23
^tu24

1 8 2 0 - 0 2 33
1 82 0 - 0 0 7 7
I 82 0-O5 86
ta 20-062 ?

alulo I
^ lulo2
nlulo3

ta2o-0196 ^ ^
18 ao-o 22 3 lÄ14
t8 20-02 03

I
t
2

I C : L I N E A R V O I . T A G F R E G { , L A T O R II N P U T }
A'1PI..
I NTEGRATFD C IRCUIT:OPERATItllAL
IC:OPERAIIONAL IIPt IFI FR

28480
284AO
or263

I 820-O196
ta20-0224
sLg940

a lu20 I
, tu20 2
^1U203

l 8 2 6 - O O3 8
ta 20-02 ? 7
1 82 0 - o 3 2 1

I
I

IC:LIN OPERATIONAI AI,IPL
I MTFGRATED CI RCUI I:NPERATICTTAL AIPL.
INIEGRÄTFO CIRCUI T:HT-SPEEO COBPARATOR

o47 It
28480
o1295

ltc 14t66
LA20-O221
SN7? TIOL

a lu30 t

la26-0o09

I

IC:LtN€1.8. OP.

28480

I 826-0OO9

alu40l
^In402

l8l8-2056
r820-0583

I
6

fiOS ! N-CHANNt _LÄRnli
IC:TTL LP OIIAD 2-INPI

2A4AO
12040

l8 l8-2056
0x74LOON

AIYI
AIY2

04l0-046 5
04l o-0466

CRYSIAI.:OUARTZ
4 M H Z ( 6 0H Z O P T I O N )
C R Y S T Ä LO
: U A R T Z3 . 3 3 3M H Z ( 5 0H Z O P T I O N )

28+80
2A4aO

04lo-o{65
o4lo-0466

ATAI
Älalß l06

0349(F66521
2too-3261

I
I
I
I
t

B O A R DA S S Y : V F R T I C A L
R:VAR IK OHHIOT

2a4AO
2 8 48 0

03490-665 2l
2too-126?

a la lR2lo
AIAIR?25
AIAIR228
llatRlrl
llalR3lT

2lo0-331 0
2too-a?-57
2too-az 57
2l.oo- 330 7
?loo-331 5

t

R:VAR CERIIET IK O}II I O ' T Y P E P 3 / 4 X
R:VAR 20K OHrl l0l
R:vÄR 2OK tl}rl{ l0l
R:VAR CFRIET 20K (}tl,I I O I T Y P F P 3 / 4 Y
R:VnR CERIET 20 oHr{ lot TYPF P 3/4ll

2A4a0
2 84 8 0
28480
28480
28180

2loo-3310
2too-1257
2too-1257
2l o0-330?
2 loo-33 I 5

H I G H I I { P F O A N C FA S S Y
H I G H I M P E D A N CA
E S S Y :R E B U I L T

24480
28480

0349 $-66502
03490-69502
ROr,ll5E4?0J5C
0l 60-22 I 6

tA2
1^?

03490-66502
03490-69502

I

OTIAD 2-INPT AND GATF
SIX DECADE
OUAL vfl r^GE-CoNfRollED
OUAL D F/F
4-aIf
BINARY CoUNTFR

IC:TTI.
IC:TTL
lC:TTt
IC:TTL
IC:Tlt

2
I
8

ttul.Tlv!

DI'AL O F/F
IC:TTL
IiITH
HEX D-TYPE FI.IPlFLOP
IC:fTL
lC:OUAL CO|{PARAIOR AV=7OO }tIN.
(4096,
IC:8IT-ROtl
HFX INVERTER
IC:TIL

I
I
a

4
3

t5

I

IC:TTL
IC:TT|IC:TTI
IC:TTL
IC:TTT.

CLFAR

8II{ARY COUNTER
SYM'P-ON 4-AIT
DUAT O F/F
LP HEX INVERTER
t.lENAELE
A-INPI'{(ILTIPLEX€R

AxPL.

XANO GATE

a2cI
A2C2

ol 40-02 04
or60-2218

I

c:Fxo rllca 47 PF 5r, NPO S0CVDCId
c:Fxo rilca loo0 PF 5t

1 4 65 5
28480

A2C1

0160-3190

I

c:F xD üY 5 ttF lot

^?c5
^2C6

or+o-orsr A
ot ro-ooso $

ar{.pl
^2CF2
^2Cr3
^ 2 C P1

I eo l -0586
lcol-0524
r90 r-0586
le0 1-0586

A2CF9
^2CF6
l2cR?
12cra
r2c!9

re0l-0586
l90r-0586
t90t -0586
1 9 0 2 - 3 19 0
1902-3190

qers'@ Sekdating Ss. Vlll

6
I

28480

o 160-3190

C:FXo IIICA 56 PF 5Z 3oOVDCH
c:Fxo cER rooo PF +8G-20! looovocH

19?ol
562a9

RDfaltES60J 300v
c 0 6 7 B l 0 2 E1 0 2z s 2 6 - c D H

REPL DINDT ASSY(',IATCH€O PAIR I
DINDF:SI
RFPL DIOTJE ASSYIXATCHEO PÄIRI
R E P L O I O D E A S S Y { N A T C H E OP A I R '

24480
28480
28 480
28480

l90l- 0586
I 901-o 524
I 901- 0586
leol- 0586

RFPL DIOOF ASSY(fiATCHED PATRI
R E P L O T O D E A S S Y I 1 4 A T C H E DP I I R I
REPL DIOD€ ASSY(XATC.}GD PAIR '
5l 400 llt
DloD€ 8FF^KOOI{N:l3.OV
5? 40o l{l.l
DI0DE EREA|(oOIN:13.0V

2 8 48 0
28480
2a4AO
24480
28480

1901- 0586
l90l- 0586
l90l-0586
l9 02-3 I 90
1 9 0 2 - 3t 9 0

See introduction

SovDcrd

to this section for ordering

information

Section VI

Model 34904

T o b l e 6 - 1 . R e p l o c e o b l eP q r t s l C o n t ' d l

Mfr
Code

Mfr Part Number

afAo: sn I ELDlt{G
BEAD:SHI EIDI '{G
E I T R A C T O R : P C8 O A R O . S t l c f

28+00
28480
2A{80

9170-o89a
9l 70-o89a
tO{)-{1740

EXTRACTOR:PC.
8OAIO. Bß,Ott
S O C K E T : I CI P l } |
TSTR:SI ilPN FET DIAI.
ISTR3

28t80
l7l l?
28tAO
28480

40{o-o?r9
5r66-2t5-t
I A5t-O3l I
lESt-ot99

R: MATCHEDSETWITH A2R2AND A2R4
R: MATCHEDSETWITH A2RI AND A2R4
R:YAR CERXET 'O OI.'| lOI IYPE ? 'I4I
R: MATCHEDSETWITH AzR' and A2R2
R:FXD IU 50X (I.ilt lot 5r

2W
28480
2Aa80
28480
28180

G11-258it
611-2583
2 lo0-3tl +
(Blr-25€B
08l1-oo32

R:FXO tl 5o|( tl{t lo! 5l
R:FID tt llt( (}tx 31 3l
R:FXD yr I OHfr 3t 3r
R:FXO FLlr 499( OHX l.ot
l/0a
R:FXD XCT FLX IO.OX artil ll lrBX

28rEO
28480
2E480
2A48(t
2A+80

081:l-o032
osll:l 33t
08t2{ol5
,069e-32rt
ofSl-oa{z

Reference HPPartNumber oty
Designation

A
A

6

Description

A2LI
^2t2
l2xPl

9l 70-0894
9l 70-0894
40,40-o748

^zl|P2
Az'|P3
^201
^202

4040-0749
t200-o437
l8 t5-o:|l I
lat5-o399

A 2 nI
A2t2
l?R3
t2F{
A 2 R5

oE I l-2583
08 I l-258 3
2too-ltr4
08 ll-258:l
08 l3-oof2

12R6
^247
l2R I
^2ß9
l2R lo

oal 3-oo32
oSll-1335
08 l2-oor 5
o69a-321 5
Ol'l-Ot 42

I
I

l2t ll
^21R12
lzR r3

0757-0442
069A-t?7 A
069a-4497

3
I

R:FXO tEI FLft 10.(X t,lra ll l/8r
i:FXD ||€l FLlt 49.9( Ol{X lt l/8t
R8FXDFLr{ 46-7K Otil lt l/tL

2a+60
24t80
28aro

0757-o.}12
069e-122r
0698{t9?

t2R 15

2loo-331 3

2

R:VAR CERI'ET IOO OHil IO!

28+OO

2l(xF33rt

l2n l6
A2nl?.

2loo-33t 6
0757-O..42

I

R:VAR CERrf€T lO Olfi lot lYPe ? tt4y
f,:FXD rET FLt| lO.O( (t{H lt l/8t

28t80
28t80

2l o(F3316
0757-O+{2

AArl

lE26-OOl I

2

IC:I.INEAR

28480

la26-oola

t ^2u2

l8l3-ooo3

I

IC:HYBRIO FFT

2aaro

la l3-ooo3

l3

03/t9G-665G1

I

AOARD ASSY:OI SPLAY

284€O

o:t4.9{F6650t

l3cl
Atc2

ol 80-ol 97
ol.8(F0376

I

C : F X D E L E C T 2 . 2 U F I O t 20vtf,ll
c : F r D E L E C T O - a ? t t l o t 35UlCra

562a9
*2e9

r5|n225I902012!OVS
ItOD'fl+I9O3512-OYS

l3DSl
ltDs2
130s3
t3D54

1990-o33 0
199(FO330
1990-o330
199(FO330

N I " E R T C A L O I S P L A Y : S O L I DS I A T F
iauHERtcAt- Dt sptAv 3solt D srAT E
NUIERICAL OISFT^Y :SO|_IO StArE
N U I { F R I C A LD I S P L A Y : S O L I O S T A T E

28480
28460
2a460
2AaAO

199(FO3lO
199(Ht330
l99H3tO
199(H3tO

130s5
l3D36
130s7
l30sa
130s9

1990-o330
t99(FO330
199(F0405
199(FO{06
199(FO406

N I , { € R , T C A .LD I S P tA Y : S O L I D S T A T E
N U | | E R I C A ID I S 9 L A Y : S f t r l D S r l r E
ilt l€R.lC OISPL|IY:t€OI PLUS-fi tlUSl
D I O D E : V I S I A T EL I 6 H ' E X I T T E R
D I O D E : V I S I S L EL I E H T E I I I ' E R

28a80
2a460
2Ateo
28+80
284AO

1990{t330
1990-o3to
ltxr(H).o'
l99tH)406
tr9Hto6

I3TPI
^?,,'P2
t:ttp3

o349(F24301
5040-591.4
72o(Fl27l

I
I
I

tilsx: INNUNCt Atan
H(ruSIilG: liltl
HEAT SI TT:DISPL.AY

48a80
24460
28aAO

0369(F2+301
'{)4H91a
7200-127t

l{
I
I
I

3
2
a

6

I
2

NP€RATI(r{AL

a3lrP4

1200-o452

I

SOCXET!IC COI{TACT

t3R t
r3n2
l3R3

06a+-221 I
o6a4-lol I
o68a-l 8l I

I

R:FXD COI|P 220 oHil lot
R:FXD COXP LOO (}rt lol
R:FIO COrtP 180 oHra tot

r:!Ra
t3t5
atn6

068Fl8l I
o6a{{701

^3Ul
l3lr2
lar3
l3{ra
l:Ir5

la z(FO53 7
1820-o?16
la2(FO5A6
Itz(FO5A7
ta2G{62?

l3tJ6
l:lt ?
rta
A3J!O

t820-oo5a
182(HO5a
16z'(H583

.1 Rdrb

oaa+-rrtt $

reeo-sg A

Büd.tiESa

Vill

t

l?

I
I
I
t

{

IYPE P 3/4Y

AI{PITF IER

oo?79

:Fll614l-2

oll2l
oll2l
olt2t

c8 22tl
ca I 0 t l
c8 I r l I

R:FXD COftP 180 (}{t tol l/4Y
t I F I D C O | | P4 7 o H t l o t l / t r
(}t,l lot l/ar
R,IFXD Coftp I't

orl2l
ol t21
ol t2t

c8 l 8 l I
C B t70l
c8 l S t l

IC:TTL
ICaTltIC:TTL
lclrfl
lCtTlL

2A4AO
ol29t
12040
l20ao
ofz6t

1820-or37
sxll15lil
dr?+L('+r|
Dft?4Llot
('rt93LOl59X

o1295
ol29t
l20ao
12040

sl|?a00r{
slt?aoor
Dr?tLootl
DMT4LOON

l/ar
l/41
r/al

DUIL .-IilPT TAI{O GATE
SVIC PRES€T 4-ttl
Btl|lny OOtttTER
LP I.IEI I}IYERTER
LP TRIPLE '-Itfr
it||t
6lTE
LP 0CD TO IEC- DECOIEI

ICsff|. OUAD 2-It{Pl llAl'lD Gll€
lc:rll
otnD z-lflPt ilrxD GllE
lc:Yrl
LP QIJAD2-l|{Pr illilO 6^lE
lC:TTL LP OUAD 2-INPUT NAND GATE

See introduction

to this ection

for ordering

information

6-9

Section VI

Model 3490A

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d I

Reference HPPartNumber oty
Designation

Mfr PartNumber

C A A L EA S S Y : O I S P L A Y
A O A R OA S S Y : R E H O T JEU X P E R

2a4AO
28480

03{90-6 l60l
03490-66504

EXTRACT0R:pCao^Ro. Bt-aCK

2A4AO

404{FO74a

E X T R A C T O R : P8Ca A R , D .v I o I . F I

24480

4040-o755

28480

03490-66505

l/41
l/4r,
l/{r
tll.U

orr2t
01121
oll?l
olr2l

C B 222L
c8 2221
c 6 222L
c a 222!

l./4ll
l/{r
tlg
l/41
l/4ta

ol l2l
ol l2l
oll2l
oll2l
otl21

ca
ca
ca
c8
ca

a3t3
^4

0349O-61 6r)l
o3490-66 504

a4t{Pl

4040-o748

a4t4P2

4040-0755

^5

03490-66505

ß O A R DA S S Y : R A I G € S r | I T C H

ASRI
^5e2
A5R 3
a5ß4

o6a4-2221
o6a4-7?,2 |
o6a4-222L
o6a4-2221

R:FXD
R:FXD
R:FXD
R:FXD

A5R5
/r5ß6
5R 8
l5ß 9

0 6a4-22_21
06a4-222_l
o6a4-2221
o6a4-2 22 |
0 6a4-2221

R:FXD COHP 2200
R:FXO COHP 2200
R:FXD COI{P 2200
R:FXD COtlP 2200
R ; F X D C O N P2 2 0 0

a5s4

3rol-1719

SII TCh:PUSHBUIION

28460

Slot-17 l9

^sli2

03490-61 605

CABLFASSY:RANGF

2A480

0349(F61605

A6

03490-66 506

BOARO ASSY:CONYERTFR

284 80

03490-66506

a6c I
^6C2

orso-oeo+ $$
ot 60-3976

I
I

c:FxD cER O.O5 ttF 20t lOOoYDcta
C:FXD lO PF 5OOVOC|a

562 69
2A4AO

{lc
t69t4{oH
ol60-39?6

a6c3
^6C4
A6C5
a6c6
^6C7

o I 60-3930
oI 40-o202
o I 60-:r977
ol 2I -o436
ol6()-3622

I
I
I
6

C:FXD lO PF 25OO yocta
C:FXDXICA 15 pF Sa 5oOVDCI
c:FxD 970 pF Ol
c:vAR AtR 2.1-24.5 PF
c:FxD cER O-l rrF +ao-20t loovocl

24480
2A 4 8 0
28480
74970
729a2

ol60-3930
0140{!202
olöo-3977
l89_t09-l05
81 3l-l O0-65 l-l 04Z

a6c8
6C9
r6clo
6Cll
A6Ct2

ot60-36?2
oL60=1622
oL60-3622
oL60-3622
0l 50-ooa4

C:FXD CER 0.t
c:FxD C€R O.l
C : F X D C . E RO - l
C:FXD CER O.l
c:FxD cEB^p.l

loovocr
IOOVOCX
lOOyDCta
loovocl,
loovocl

t2942
72982
729a2
729A2
729A2

8l:rl -loo-651-l
8l 3l -I OO-65l-l
6 I 31.-tOO-651-l
8l 3l -l 00-65 l-r
rl 3l-loo-65 l-l

l6cl3
l6c 14
^6C15
^6C t6
l6c l7

ol 50{) oa4
ol 50-o093
ol50-o093
ot 60-2 134
o I 50-o093

clFxD CER O-l UF +ao-201 lOOvDCr,
c:FxD cER O.Ol;tF +80-201 loovocH
C:FXD CER O.0l UF +ao-zot loovDcta
c:FID HY O-a2 UF lot 5ovDctl
c:Fxo cFR o-ot uF +ao-z0t loovDcl

729A2
72942
729A2
*2A9
f2982

8l:tl -l 00-651-l oaz
801-K8000 I I
801-K8000 ll
la8Pt50
rol-K8000 r I

l6c la
l6c l9
r6c20
Ä6C21
^8,2.2

ot 50-o093
ol60-0lal
ol 50-o093
ol 60-o22 9
ot 80-022 9

c:FXO
c:Fxo
c:FxD
c:Fxo
c:flo

129a2
14655
72942
24480
28+80

tol-|(aooo I t
ROItl t€tooJts
aol-xa000 ll
ol80-0229
ol60{t229

A6C2?
46C24
A6C25
46c26
^6C27

ol 80- I 835
ol ao-l 83 5
o I 60-394 5
0l 60-3 91 9
o I 2 t-0432

C:FXD TA 6A UF 2Ot l5yDcy
C:FXD TA 6A UF 20t l5YOCr
C:FXD pORC 39 PF lt 500vDc|.
c:Fxo PoRc 346 PF lt 500vocy
c:vAR ^tR 1.7-14-l PF

'6269
562 A9
28480
28480
74970

1500 6&tIo0ttn2-oYs
l5006E6IOOl 5R2-DYS
ol50-3945
ol60-39a9
189-505-l Ot

a6c?a
16c29
A6C!iO
l6c3 r
^6C12

ot 60-o763
ol 60-oa59
ol60-2114
o160-3501
ol 60-oa5 9

c:Fxo
c:FxD
c:FxD
c:FxD
c:FxD

00853
56249
562 A9
844I1
56289

RDHI5CO50K5S
!.48P335 Ptrl
l4aP350
H€t 138
t+4P335 Prtl

A6CR I
l6cR 2
A6CR 3

I 90l-oo{o
190 l-o040
1 9 0t - 0 0 4 0

OIoOE:SItICOil 50 IJI 30 tav
D I O O € : S I L I C O Nt O | t ^ 3 0 r Y
D I O D € : S l l - I C O t {5 O f t A t O r y

07?6t
0726t
07 263

FDGI08A
FDGIOSs
F06t 088

A6C94
l6cR5
A6CR5
16c87
A4FA

t 90l -oo40
190 t-oo47
I90 l-o047
190 l-oo47
I 90 l-oo47

olooE:sn tcoia 50 ta 30
DlooE JUr€tIoN:StLICtt{
DIOD€ Jul€TIoN:Slt-IC0ta
DIODE JUlrlcTlOt{:SIt-Ic(rl
oIooE JUNCTITil:SiLIC(X

o7263
2 84 8 0
28480
28480
2a+80

FDGI08A
t90l-oo47
l90l-004?
1901-00t7
t90l-004?

^6CR9
t6cP I C
racP I I
L4.Rt2
r6€e I !

1902-OO4l
1902-O04l
190 I{)O47
I 901-o047
1 9 02 - 3 l a 2

o{713
0471,
2r480
2Et80
28480

szl o939-98
sz 1o939-98
l90l*ooa?
l90l-0047
L902-tta2

r5ß7

:

Mfr
Code

Description

geier b BddatirE

t
I

3

2

t
2
t
I
?
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?
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6

I

COilP 2200 oHr{
COf'rP2200 r}Jr4
C O X P2 2 0 0 o H t i
COtiP 22.OOOtl4

lot
lot
lot
tor,

0|x4 10t
0tt t toa
O|{1 lll
(l}}t lot
Or+{ tot

trF
UF
UF
UF
uF

+ao-20t
+8O-2O!
+8O-2Ot
i80-20:
+8o-2oa

CER O.Ol UF ia0-201 loovDcr.
nIcA 30PF 5t 300vDct
cER O.Ol UF +8(F20t IOOVDCT
€L€cT 33 UF lot tovoo.
EL€CI 33 UF lot lovocl

ItcA 5 PF lot 500vocr
rY I UF lol 5oVDCy
t1Y O.82 UF lot 5ovDcr
PO|-Y 4 UF lot 5oYOCt.
tY 1 UF lO:'oVOC|

rv
20PrY
2OptV
2Oprv
20PtV

o l o o E : a R € a K o o t a NS . l l v 5 t
D I O O E : B R E A K D O T5I.{I l V 5 3
DIODEJUifTIOil:SILIC{}I zOPIV
D I O O EJ U I { , I I O | { : S t L I C { I { 2 O P I V
D l o o € 8 R E X D O Y i t : S I L I C O N1 2 . t V 5 :

Se. Vlll
See introduction

to

this

section

for

ordering

information

2221
2221
2221
2221
222L

o{z
O4Z
Otl
04z
o4z

Model 3490.A

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d f

Mfr
Code

Mfr PartNumber

DIODE:HITT CARRI€R
DIOOE:HOT CARF,IER
DIODE:SI 3O t.V IO PA L€A(A6€
DIoDC:SlLlCOt{
50 ,aA 30 HV
DIODE:SILICON
50 'IA :x) t.V

24480
2A4AO
28440
o7261
0726!

l90l-o5l e
l90l-o5t I
l90l-o5a6
FDGIOAS
FD€I 088

I 901 -0040

DIODE:SI|-ICON

o7263

FOGtOaS

a6( I
a6(.2

0490-l I o5
o{9(Fl I 05

SHI TCH: REFD
SII TCH: REED

2844O
28480

o+9(Fllo5
0490-tlo5

l6t( l
t6t(4
a6t I

o490-l lo6
049(FO?78
0490-l 083

28480
284EO
09026

049(Fl I 06
0490-o778
P- S. 3001-55

A6t Pl-17
A 6 X P II
A6r{Pl 9
^6AP20
t6tP2 I

0340-oo60
03ao-o93a
1200-o437
1400-o760
1400-o?60

F EFDIHRI' : IIISULAI ED IIfl'NT IN6
SPAC€R:IEFLON O.l28r
DIA lt(I-E
SOCK€T:IC 8 PTN
CLI P:I4OUNTIXG ASSY( SE
oF lt
CLIP:I{OUNITNG ASSYI SEf oF 3t

2AlAO
98291
lTll?
28480
2814O

03ao-oo60
a-1451-t
5566-2tJ-5
1400-o750
l4O0-O76O

^6tP22
^6AP2t
^6t P24
6AP?'
A6't?26

1400-076 0
1400-0760
1400-o760
1400-0760
l{oo-o760

C LIP: IIOUNTING
CLIP: llOUNf lilG
CLTP: IIOUNTING
CLIP!I{OUNTING
CLI P:FOUNTIilG

2A+AO
2A4A0
264AO
2a480
28480

l4OO-Of6O
lao(H)760
t400-o760
1400-ot60
1400-o760

^6AP27
a6taP28
a6nP29
A6t4P30
a6rP3 I

t400-o760
1400-o760
1600-o273
t600-0274
1600-o275

28480
28a80
2A4aO
28460
28{AO

I400-o750
1400-o760
1600-02t3
1600-o27{
1600-02?t

a6)4Pt2
l6t{P33
ll6tP34
A6taP35
l6rP36

I 600-o27 5
1.60{F0275
4040-o748
4040-0750
o360-l ao3

28480
2A4AO
28a60
28480
ooooo

1600-02?t
1600-0,27t
toao-o?4a
40'rO-O?5O
OBD

A6f,tP3?
l6f{P38
A6riP39

o360-t 803
036(F1803
o36{Flao3

f ERII IN f ! SOI-DER LI,,I;
IERI.tI NAL:S(LOER
Lrß
I fRII INAL: SOTOER LI.G

ooooo
ooooo
o0000

(nD
oio
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460 I
^602
r603
^604
1605

1 85 3 - O O lO
l8 55-O38 3
la54-o07r
la53-o ot o
I 454-O07l

TSTR:SI
rSTR:ü,AL
TSfR:Sl
lslRrsl
TSTR:SI

2A4AO
28+80
2A480
2a4AO
2A4aO

la53-oolo
la55-o3a3
l65t-oo7l
lA53-OOIO
laSt-oo?t

1606
4607
160E
4609
A6Q IO

la5+-oo7 I
la55-o177
185:FOOIO
l8 5t-0377
185:FOOIO

TSTR:SI lpn(S:t-tcrtir
FRox 2it37041
TSTR: F€T SI.J{{HA'ü. T
pNpISELECTFD FRO|4 atf2ilt
ISTR:Sl
f SIR:FET
SI IIH,HAN''IEL
TSTR.:SI PNPISELEOTED FROII AI32'I
I

28480
28480
28{aO
2a180
24180

l85a:oo7r
r85t-o377
1853-OOtO
1055-03?7
r 853-OOl O

A6RIA, RIB
A6R3
A6R{4, R4B. R4C

0598-821 6
2too-331 I
0698-82 I 5

I
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R : I I A T C H E OS E T
R:VAR CERr;r 500 rlOt lot
R:IIATCHEOSET

26+AO
28+80
28a80

0698-8216
2loo-3rl t
0698-a2 I 5

A6R5
Ä6n6
A6R7
A6RA
A6R9

0684-472 I
0684-4?2 I
069a-355a
069A-355 A
o75?-O4lO

2

t:Fxo
R:FXD
R:FXD
R:FXD
R:FXO

coltP 4700 0l0t 10:
CO|1P4?OO Otft 101
(}tft
ltEr FLil {.oa(
|.€t FLft +-Oa( üilt
flET FLll 301 OHft tt

orl2l
ol l2l
2A+80
28480
24480

cr r?21
cB a72l

A 6 RI O
r6Rll
l6n l2
l6R 13
A6R14

0757-04t O
0698-3497
069H489
0757-O430
o6a4-l 02 I

R:FXD
R:FXD
R:FXD
l3FxD
R:FID

ilET FLft 301 OHfi l! l/81
FLil 6.04r( OlTl lt l/8I
FLlr 2A( OHfi t: l/81
[|{El FLn 2-.21K (I{}t l: l/8ta
COrlP IOOO OIH lot l/afl

24480
28{80
2aa80
28{80
ol 121

0757-OrlO
0694-3497
069A-++a9
otrT-|J4ao
cB lozt

l6Rl5
a6ß l6
A6Rl7
A6t ta
l6e 19

o6a4-l02 I
069a{467
o7t7-0{69
0698-4308
o?57-O200

lot l/4ta
tZ ttAY
I/8I
OHil l: l/8tl
(l{'| lt t/al

orl?l
28480
2a480
28r80
28{SO

cE lo2l
0690-*467
o?57-Ot49
0698-4308
075?-O2 00

46e20
A6n2l
^6n22
46e23
^6e 2a

o7 5?-0401
069A-a488
0757-(x5a
075f-o270
069H488

Ft f{ lO0 oHft tt l/al
26.7( 0{t tt 1/8r
FL|. 30-lK O{tt ll l/Ar
FLl| 249K Otft l: l/8r
26-?( Olft l: l/al

28t80
28aao
284EO
2Aa80
2aaao

o?5t-(rol
0690{488
o?57-Oa53
o79l-o270
o69t{48A

Reference HPPartNumber oty
Designation

l6c Rl 4
a 6 c RI 5
l6cRl 6
a6cRl 7
a6cR I 8
6CRl9

1 9 0I - o 5 t a
l90I*o5l 8
1 9 0l - o 5 8 6
l90l-o040
t90 l-oo40

1
3

I
6
3

I

I
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,

I
l3

I

2

3

I
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2
lo
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2
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Description

50

f{A 30

REI.AYlSUITCH. REED
STTTCH3RFED TAGN€TIC.
COIL ASSY:R€FD RELAY

tV

IlTNIATURC

ASSYI SET
ASSY(SEr
ASSYI SET
ASSVI SEI
ASSYI SEI

CLIP;I,IOUNTIilG ASSYI SET
C , L TP ! X O U N T I N G A S S Y I S E T
s T A | { PI X G : 8 t Ä S S
STATP I 'IG: BRAS S
SHI EI-D: POf
SHI ELD: POT
SHI ELO: Pof
EXTP,ACTOR:PC BOARD,
EXTRACTOR:PC SOAROi
IER'iINAL:Sü.D€R
LLß

3l
3l
3l
3t
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oF 3l
oF 3l

8f ACK
RED

PNPISELECTFO FROT' ä{32'II
FET SI N-CHANNEL
NP|ISEIECT€D
FRot at3to4,
pltP(sELEcTEo FROX ä{32511
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R:FXO COI|P IOOO Otet
R:FXD FLra l.Ot( Ottt
R:FXD FL'I 2OT OHT II
R:FXO frET FL'| 16.9(
R:FXO tET FLil 5.62(
R:FXO n€T
R:FXD FLta
R:FID il€r
R:FXD tEl
R:FXD FLt

See introduction

oF
oF
oF
oF
oF

to this section

TtpF p 3/4ta
l/4L
l/41
lt l/8r
l: l/8t
l/8L

for ordering

(1698-3554
0690-3558

o?5r-orlo

information

6-11

Model 34904

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s l C o n t ' d l

Reference HP PartNumber
Designation

^6R?-t
t6R26
A6R27
a6ß28
A6R29A, R298

o7 57-0453
069a-3544
2loo-3306
2 loo-330a
0698- 8214

A6R3O
A 6 R 3I
A6R32
46R33
A6ß:t4

069a-349 5
069A-4467
2lo o-3309
0757-M57
0751-O45t

t6n 35
a6ß36
A6R37
16ß 38
A6n 39

0698-45 I 4
0757-O454
0698-122 I
0757-O4a6
059a-3540

l6R{O
A6R4l
46342
46n43
^6944

0684- I 53 I
o59A-322 A
o757-0436
069a-3trO
0698-4497

A6UI
^6tt2
461,3
A6TJ4

1820-O054
1820-o069
t8 26-00a9
ld 20-o20 3

A7
A7

0349(F65507
03490-69507

ATCr
A7C2
A7C3
a7c4
^7CJ

0150-@73
0150-0073
0[ao-1701
ol 70-oo2 I
o 1 8 0 - o 23 0

l?c6
^1C7

ol 60-ol 94
o I 50-o07 I

ATCRI

190 l-oo40

otv

Mfr PartNumber

2a+80
28480
2A480

28aao
2A480

o?t7-0453
069A-3548
2100-3306
2loo-3308
0698-62 I 4

R:FXD ftEl Ft-H 866 oHn lt l/a||
R:FXD FLX l.O5{ O}rI lt l/8I
R:VAR CERI,IET2K OTTI IOI TYPE P 3I4I
R:FXD XET Ft-t{ 47-5r( OHtl lt 1/8I
R:FXO l|ET FLil 30-lK o.tx lt l/8r.

28440
28t80
2A4aO
28480
28{80

0698-3495
0698-+467
2loo-1309
0757-0457
0?5?-0453

2
2

R:FXDFLX
R:FXO |(€T
R:FXD t(ET
R:FXD tfET
R:FXD fiET

I/8U
l/Al
l/6L
l/ar

2A4AO
28680
28480
2a+80
2a400

o69E{514
0757-ü54
0698-3228
o?57-0436
0690-3540

I

R:FXD COilP l5K OHt{ lot l/+t
()+0{ ll l/8r
R:FXD rlET FL|| t9.9(
R:FXO tET FLI{ 4-1ä( at{H lt lrAU
R:FXO f'lFT FLr{ t5.4r( ()|rX ll t/8r
R: FXD MET FLM /t8.7K OHM 1% 1/8W

oll2l
284 80
2844O
28480
28480

ca l53l
069A-3228
o757-0436
069A-3t40
0698-4497

T C : T T L g U A D 2 . T T P T N A N DG A T F
lC;TrL DUAL4-INPT PnS f{ll{O GtT€
IIPLIFT€R-LINFAR
I C : O P E R A T T O N A IT P LT F I € R

ol 295
ot295
28+80
07 263

sil7+ooN
sil7a20N
1826-OOa9
sLa94{)

I

B O R D A S S Y : O H I {C O W E R ' E R
REBUILT OHMS CONVERTERASSY

24480
28480

(1349(F66507
03490-69507

2

I

Cr FXD
C: FXD
c:Fxo
csFID
CiFXD

56289
56289
24480
84+l I
5628e

co288102E101
KS27-CDH
co28B102E101KS27-CDH
olEo-l 70 I
663Ura47294
l5m l05xoo50a2-DYs

I

C : F X D , r YO . O t 5 U F l o l
c:Fxo cER {oo PF 5t r000vDoa

562 89
56289

l92P t 5392-PTS
cot68t 02E40 I JS27-Cltil

DIODg:SlLlCnN 50 r|A 1O lV

o7261

F061 088

o7263
04713
07251
ot263
o?263

FO6t 088
sz 10939- I lo
FD6l 088
FO6lOaS
FOGIO8A

07262
0726t
o726?
o7263
o+7 l3

FDGIOAA
FOGI OA8
FOGIOaA
F06tOsA
sRl358-9

TTßE:VOLTACE PROTECT(N 9OY 2OI
STITCH: REED t|AellETIC! lllt{lATt RE
}tI NI TTJRE
S IITCH: R €€D I'AGI{ETIC.

2A4AO
28+AO
28t80

l9?o-oo52
04!n-o774
o+9()-o7?8

srI rcH: REED
SHITCH:RE€O
STI TCH: REEO
RETAY/COIL.
T,ELIY/COTL,

28t80
28480
24480
28480
28{80

o4txFo77a
oa9()-0778
0490-o?78
()490-1033
049()-1o33

28480
00026
09026

049(FtO33
P. S- 300 l-5S
P- S- 3001-5S

I
2

I
I

I
I

A

Mfr
Code

R : F X O a r E TF L | t 3 0 . I K o H X l : l / 8 1
R:FXO FLf{ 732 oH}l tt l/8L
R:VAR CERH€T 'OK (It}t IOI TYPE P 1/4I
R:YAR CERiET 5K O|ä lot lf?t P 3t4r
R:!1ATCHED
S€T

I
2
I
I

A

Description

lO5( OHXla l/8r
FLx 31.a( tH|| lt
FLll 49.9t( ottx l:
F a - A4 . t X , ( } l t { I t
FLtl 15.4( (}ilt lt

CER 10O PF
CER 10O PF
EL€CT 6.6
nY 4700PF
E|.€Cf l.O

l0% lomVDCW
1096loooVDCW
UF 20t 6YOCJa
lOt 400YDCI
UF 2Ot SOVOCI

.-l

^7Ce2
l7cR3
A7CR4
A ? C R5
Ä7CR6

190 t-oo4()
1902-3 I 04
1 9 0l - 0 0 4 0
t90l-oo40
190 l-0040

OI0DE:StLtCON
oIoDE:EREAlpOrN
DIODE:SlLICOil
DtoDE:SILICON
DIOO€:S|LICON

50
50
50

A?CR7
l7cR8
^7CR9
A ? C nI O
aTcR I I

t90 t-o04 0
1 9 0l - o o 4 0
l9()l-0040
190 t-o040
l90l -o02 a

OIOD€:SILICON
DIOO€:SILICOiT
DrooE:sILlcoN
DIODE:S lLtCOt{
oloD€:sILlcoN

50 llA
50 ltA
io ria
50 ra
0.75a

AT D S I
A 7 XI
^7X2

197(FO05 2
0490-0774
0690-o778

l7t3
l7t4
l?r5
t?L I
^7L2

0490-o778
o490-o77A
(x90-077a
0490- t o33
0490-1033

A7t 3
/l?L4
l?L 5

049(FlO13
(}49(Fl Oa3
o+9(F lo83

RFLAY/COIL.
REEO
COIL ASSY:REEO R.EL Y
COIL ÄSSV:REED RELAY

l?xP I
^7r92
^71P3
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50

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to this section for ordering information

Model 34904

Section VJ

T o b l e 6 - 1 . R e p l o c e o b l ep o r r s ( C o n r ' d I

Reference HP PartNumbet oty
Designation

Description

Mfr
Code

Mfr PartNumber

tTfrPl I
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80131
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24480
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0,69A-3264

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28+80
28+AO
24480
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io757-O28O
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0698-4430
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28a80
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2lüF3304
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28480
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o757-O15t
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l7R4
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o698-4430
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l7R9
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A?R19
l?R20
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o757-04't
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lC:Lll{EAR OpERArlO{At-Alip!lFtER

o1295
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12040

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562A9
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to this section for ordering

information

6-13

Model 34904

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Reference HP Part Numbet
Designation

otv

Description

CONTACIS
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BßARO
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o?49(FOl209
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0684-332 I
0684- 332 I
06a4-332 I
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r9u1
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I820-0584
I 820-0595
l8 20-o 584
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A9U5
t9lt6
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l8 20-o 546
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l/4U
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24480
12040
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1820-o430
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o349(>66509

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56249
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LP OUAO 2-INPT NOR GATE
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to this section for ordering

information

Model 34904

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r r s ( C o n t ' d )

Reference HP PartNumbet
Designation

Mfr
Code

Mfr PartNumber

sttrcH:sLtDE SPDr O.5A l25V ACIDC
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t2040
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284aO

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l8 20-o546

IC:TTL IP HET II{VET,ER
TC:TTL LP }€X IIIVERTER

lllu3
Al I U/r
ll lu5
Allu6

rlluT

r820-o583
l8 ?o-o 58{
l8z(F058{
1820-o59 5
182(F0599

lC:ltlIC:TTL
tc:TTt
lc:rll
rG:TTL

LP qUAo 2-Iilpr NAN0 6lTE
Lp OIHO 2-t*"t
NOR c^l€
LP otllD z-II{PT uor erie
[P nral J-x xlsr€R st_tYE F/F
4-Btr rrttt
sxtrr RE6ISIER

l2 oto
120{o
l2 040
l20a{t
t2 0to

Dt|?4t-ootl
otTtL02t{
Dl|7{L021{
Dlt?+L7tfl
oä7{L9til

rl lu8
Al lu9
Allul 0
/l llul I
rllul2

l8 20-o599
1820-O596 IlN
l8 20-l loo
1620-0656
l8 20-O546

TC:TTL
IC:TTI
I C:fll
ICsTIL
IC:TTI.

'-BII
TT/LT SHIFT REGISTER
LP DUALEDG€ TRT6, o F/F

l20ao
12 040
01295
01295
12040

Dt?4L95tl
Dlt/tL7tr
sN7a29t
sl|?4L9tt{
ot?aLo+ll

tl2

0349(F66512

I

ourculRo

284EO

03a9(F65tl2

llzcl
^12c2
ll2c3

ol60-0154
ol6(Fol57
olao-o197

I
I

C|FID lllcA ttY O-Oo22 UF tot 2OOVDCI
CsFxD tY O.OOi? UF lot zOoH)CI
C:FIO ELECr 2-2 uf lO! ZOy(E,ta

56249
56289
249

t92P2?2t2-?lS
192Pa?292-PrS
Ito22tr90?oa2-DYs

A12rp I

o+o:l-ola9

EITT,ACTORSPCrBLACI(

28480

o40t-o189

A l2frP2
Al 2 r P 3

()+o3-ola9
1200-0{2{

€XIß.ICTOR:PC' SLAC|(
BLf, lt CA]i|TACI
S(E(Ef:IC

284aO
23880

(rGt-olr9
csl2900- la8

I l2tl
^t2e2

la l(Foot9
068{-t521

R E S I S T I V E N E T I O R T S I OI 6 . 8 X 0 t { t l o t
R:FXO CO||P ISOO Ottl lot t/ar

?B4aO
oll2l

l8L(H)Oa9
cc lt2l

ll2n3
r1294
ll2n5
412f,6
1t287

06t4-223t
06'34-22a1
06t+-lo:tl
o6a4-l 03l
(16E+-lo3 I

I:FID
R:FIO
R:FID
R:FXD
R:FID

ol r2l
0tt2l
0l l2l
0ll2l
oll2l

c 8 ?2rl
c5 22at.
C B I 031
CB l 0 3 l
ca l o 3 t

l

RdEbBdätiESaVill

A

4
A
A
A

2
ll
I
7

See introduction

LP +-AIT 2-INPT XULTIPLEXER
LP HEX INYERTER

RExorE 80lRD assY

COI|P 22K
COüP 22t(
COI|P lot(
COI|P tO(
COXP IOX

o.tx lot
OHX LOI
(l|ilt lot
OHX lot
(}tX lot

to this section

l/tl
l/4r
l/tta
t/at
l/41

for ordering

information
6-lä

ModeI 34904

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Reference HPPartNumber
Designation

Mfr
Gode

Mfr PartNumber

o7 26t
l2 040
t2040
04? l:i

u6891-O959X
Dt{7{LO2N
otl?4L73til
Lc837P

04?13

sN?402N

2 84 8 0

03490-66511

'6249
729A2

c067 Blo 2Elo2zs26{oH
801-|(80001 t

72942
56289

a ot - K 8 0 0 0 1 I
150D225X9020A2-DYS

DIOOE BREAKDOIIN

2a4 80

1902-0671

DIODE:SI
30 t,'V IO PA LEAKAGI
DIODE:SI 30 HV IO PA L€AKAGE
OIODE AR€AKDOTN
DIODE 8R€AKOOTN:13.0V 51 400 llll
DIODE AREAKOOIiNT13.0V 51 400 fit

2A4AO
28{80
28480
28480
2a{ 60

l90l -o586
l90l -0586
I 902-06?l
1 9 0 2 - 3 19 0
1902-3190

2A480

1902-!005

23880
28480

csA290G14B
4040-o7t I

28480
l?ll7
l7l lt
lTll?
?a4ao

4040-o?54
5566-2t5-5
5566-2:,5-5
5566-275-t
1200-o{74

2a4ao
oll2t
oll2t
284 80

o8l3-o032
co 27rl
cB 2731
69A-7962

28480
284AO
?-a4ao
28480
?8480

2l oo-3305
2 I 00-3305
0698-+202
o757-O277
06tt-122,

28480
2A4AO
2A4AO
28480
2A4AO

2too-)ll4
0698-a2? I
21 00-33 I 3
0757-O142
075?-0376

2a4AO
0 11 2 1
2A4AO

2 I OO-3305
cB 3921
2t oo-3:t05

lC!t.lN€AR oP. A+tPL.
IC!I.INEAR OP. A}tPL.
IC:LINEAR OP. AilPL.
I I { T E G R A T € O C I R C I ' I T ! O P E R A T I ( } " I A L AT P L .
I C : T T L L P O I , A O 2 - I N P T F X C I . O R GAIE

28480
28480
2844O
24480
12040

1826-Ol lO
1826-0l I O
1.826-0l I O
t820-o221
Dfi?4L46il

OAIA üJTP('T ISOLATION ASSY
PLÄTETTI HO('NTING
T STR: PHOTO

28480
2 84 8 0
28480

0349G-60306
0349(FO{l l5
1e9o-O+O2

TSIR: PHOTO
TSTR: PHOTO
TSTR: PHOTO
T STR: PHoTo
TSTR: PHOIO

2a480
2 84 8 0
24480
28480
28180

1990-oto2
1990-o402
1990-o+02
1990-0402
1990-ot0 2

otv

Description

I

IC:TTL
TC:TTI
IC:TTI
TC:DTf

XUITIPLFX
LOTI POT€R Di,AI 4-INPT
fP OUAD 2-INPT NOR GATE
LP DUAI JJK }IASTER SLAVE F/F
HFX INVERTER RL:2X

t8 20-0 32 A

2

IC:TTf

OUAD 2-INPT

^13

03490-665 I 3

I

RATIO

REF€RFIICF SOARD ASS{

al3cl
Attc2

ol 50-c 05 0
ol 50-o093

c:FxD
c:Fxo

CFR looo
cER o-ol

Al3C3
al3c4

ol 50-0093
0180-0197

c:FxD
c.:FxD

100VDC.y
cFR O.Ot UF +80-20t
ELEC 2.2 UF 10% 2oVDCW

a l3cR I

l9 02-067 I

a l3cR 2
Al3CR3
I l 3 C R4
al3cF6
AI3CR?

I90 l-o5 86
I 90l-o5 86
1902-o6? r
t902-3 190
1902-3 190

A I 3 C R8

1902-1to8 5

I

DtoDE

al3riP I
l l3r,lP?

t200-o424
4040-0748

2

SNCKEI: TNIFGRAT€D CIRCUIT
€XTRACTOR:PC AOARO' BIACK

l l3tlp 3
a l3ltP 4
a l3xP 5
al.3r,{P6
a l!ll.P 7

4040-o154
1 2 0 0 - o4 3 ?
l2 00-043 7
1200-0437
t200-0474

2

EXIRACTOR:PC 8f|ARor
S O C K E T :I C 8 P I N
S O C K E T :I C 8 P I N
SOCKFT:IC 8 PIN
S()c(Et: lC l4-PIN

l13R I
AttR2
AI3R3
I l3R4

o8l3-o032
0 6a4-2f11
0684-27:Jl
o698-7962

AI3R7
Al3R8
a l3ß9
,allRlo
A I 3 R II A , R 1 1 B

2100-3305
2roo- 3305
069A-4202
o751-O277
08 I t-f?23

al3Fl 2
Al3Rl3
al3Rl4
Al3Rl 5
al3Rl (

2 r o o - f 3 14
0698-a27t
2loo-33 t 3
0757-O442
o 75 7 - 0 3 7 8

Äl 3 R l 7
ll3Rl €
al3R I 9

2loo-3305
06 84-392 I
2lo(F3305

a l3Ul
AI3U2
AI3U3
AI3U4
Al3U5

la26-0 I I O
t826-Ol I 0
1826-0t tO
LA20-O22 3
182(F0598

ll5
ll5rPl
ll5ul

03490- 60306
03490-04 l.l 5
1990-o40 2

rltu2
I l5u3

I S90-0402
1990-o40 ?
199(F0402
1990-o 40 2
19 9 0 - 0 4 0 2

Al?ul
^L2u2
AI2U3
At2tt4

1 8 2 0 - o 7 08
la20-o 584
1820-o595
I 820-Or 2 I

2

^l?u5

I l5L4

rttL:
^15!6

2-

2
I
4
I
I
I

I

I

I

t

2

I
I
36

NOR GATE

PF +8o-2ol
uF +80-201

ßREAKOO||N:4.?5v

51

lOOOvDCl,
toovDct{

400X|'

14 COXIACI

SLUF

5t
Ol{l{ lol
R:FXo lH 50(
l/4L
lot
R I F X O C O r , r P2 t K , n H i l
I/{H
R:FXD COiIP 27K OHt{ l0l
l/SY
R:FXD.FtN
976K-gH'l
l.O!
00K Oti{ lol
3ltll
R.:VAR
oHl lOl
3/4tl
R:vAR CfRltEt('looK
r/81
R:FXD Ffr{ 8.A7K nfr{ lt
l/8v
R:FXO ltFT Ftf4 +9.9 0}}t tl
R: MATCHED SET
R:VAR
R:FXO
R!V^R
R:FXO
R:FXD

ruRN
TURN

IVPE P 3l4r
CER{€T 50 Orfi l0l
TiETAL 6LAZE t.l
OHll 5t l/41,
(
}
{
h
TYPE P 3/+l
lot
CERHET lO0
0+il{ ll
l/81
HET FLf{ lO.O(
oHlt M/8|
ltET FLI ll.O

R:VAR CERf|ET l00K {lHr.t LOa )l4|t
R:FXD COI{P 3900 0H,t LOr. lltl
tl41
R:vAR CERIET loOK OHä lo,

See introduction

I/2
l/2

l/2

ruRN

1/2

rURil

to this section for ordering information

Model 34904

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Reference HP PartNumber
Designation

Mfr
Code

Mfr PartNumber

INCTIA&DBCD ISOLATTOIIBOARDASSY
T S T R : S l N P i l I S E L E C I € DF R O t A , r 3 ? 0 4 1
T S T R : S l N P t i I I S E L E C T EFDR , O i ta n 3 ? O { l

28a80
28480
28480

o:tt9(F66515
1854-0071
18't-O0? I

28{80
24480
2A4AO
2a460

I I't-00?t
1654-OO7l
I 85r-0071
I 854-00? I

ol l2l
oll2l
oll2l
0 1l 2 l
01121

c8 4701
c8 t?ol
c o 4701
CB 4?Ot
CB 4701

otv

Description

AI ' A I
arSl lo I
al5al02

0 3 4 9 0 - 6 6 5 15
1 8 5 4 - O O 7I
l 8 5 4 - O Ot I

ll5alo3
alSalc4
ll5Älc5
al5alc6

l 8 5 4 - O O 7I
1 8 5 4 - O 0 7I
l8 54-OOt I
I 854-O07 I

ISTRTSI
TSIR:SI
TSTR:Sl
TSIR:Sl

AL5!l8l
tl5tlR2
elSllR3
Al5Aln4
tltalF5

06a4-47 0 I
0664-4701
0684-+70 I
o6a4-4701
06a4-470 L

R : F X D C O f , t P4 ?
R 3 F X DC O | { P4 7
R:FXD CO|{P 47
R:FXD CnHP 47
R : F I D C O ! { P4 7

ll5alR6

0684-470r

lt5at14

8120-1855

At5A2
ll512Rl
^t5^2R2
It 512ß3
A l 5 A 2R 4

0349(F66516
0698-4 l2 3
069A-4t2:,
0698-4121
069a-4123

tt:tz*s
ll5r2R6

I

NPNISELECTED
FROT AI37O4I
NPNISFLFCTED
FROfi2I{3704I
N P N |S E I _ E C T E F
OR O i t a { 3 ? O 4 '
NPr{lS€LECTED
FROil an3?O4t
OHfi lot
oHtt lot
oHil lot
oHn lot
ot{a{101

l/4li
l/41
l./4ta
t./41
t/4H

R : F X D C O ' { P4 7 o H X l o t . l / { l

0l l2l

c8 4 7 0 1

CABIE:RIEAON

28440

ot 20-t 85 5

OUTGUARDBCD ISOI.ATI(rI BOARDASSY
R:FID XEf FLX 499 (]Hl| lt t/8t
R i F X D f { € T F L X 4 9 9 O H t al t t / 8 r
R:FXD ltEr FL'l {99 oHti l! l/ar
R:FXO r,tET FLft 499 oHfi lt l/8r,

2A4aO
2a/T80
2E480
284r0
2 8 48 0

(I:|+9(F66516
0698-tt 2l
0698-6t2t
0698-{l 2:l
0698-4123

0698-4123
0698-4123

R:FXO irET FLt 499 oHr{ l!
R . : F X Dx E T F L l l { 9 9 O H ü l t

28480
28440

o698-4t2t
0698-{123

ll 5l2r 5

8l 20-18 55

cAEt_E:RtBB0r{

28aao

al20-l 8t5

^17

0349(F6030A

2A4aO

o3t9(F60308

Al?xPI
^l?ul
AI?U2

03490-04l l6
1990-o402
199(F0402

PLATE:LI
T.(UNTINc
TSTR,: PHOTO
T STR: 9r{oTO

28480
2a{80
24480

o:ta9(F04l16
I 990-0402
1990-0402

ll7ul
Al?ua
^17u5
tl?u6

1990-o402
1990-0402
1990-o402
199(F0402

fSfR:
TSTR:
TSTR:
TSTR!

2A4AO
2A4aO
28480
2844O

1990-0402
1990-oi02
1990-oto2
1990-oto2

Al?al
llTalo I
tlTtto2
AlTrloS

0349(F6651?
1854-O07 I
1854-O07 I
1854-O07l

INGUARDR€i..IsoLATIoN BoARDAssY
T S I R : S l N P t { lS E T E C T E DF R o i l 2 i l 3 7 o 4 1
T S I R : S l t { P N a S E L E C T EFOR c t A n 3 t 0 { t
lsrR:st
NPN|s€LEct€D FROi at3704l

2A4 80
284a0
286r0
24480

ot49(F5651?
1654-OO7l
I 854-OOtl
1854-00? I

rlTat ßl
Al?al n2
lltll
R3
Ä17^tß4

0698-4 I 2 3
(}6a+-4701
068+-4?O I
o69a-+123

R:FXD nET FLH
8,:FXD COI{P 47
R:FxD CoitP 17
n:FXD HE.r FLH

28180
ol 121
oll2l
28480

0698-412!
cB a70t
c8 4701
069A-4123

al.7AlR5
alTal ß6

0698-4123
o6a{-4701

R:FXO ||Er FLr 499 oHr{ lt l/ol
R : F X O C O N Pa ? O H t l l o t t / 4 l t

28480
oll2l

o69a{123
cB 4701

AlTll 16
AI 7 A 2

al 20-l 855
03490-6651 I

CAELE:RIAEON
OT'TGIITRD
REI{ ISOLATI(}I

28480
24t80

8120-1855
03a9(F66tla

Al7A20t
At? 4202
al71203

l8 54-OO7t
1854-OO7I
l8 54-O07 I

T S r n : S l N P N I S E L E C I F DF R O r 2 N 3 7 O 4 l
TSTR:Sl NPN(S€LECTED
FROr an37o4l
TSIR:SI llpl{tSE|_ECTEOFROI| an3ZO{l

28480
28a80
24480

I 8t4-O0? I
1 854-OO?r
l8*-oo7
t

A l ? Ä 2 RI

0684-470 I

R:FXD COrP 47 oHlr lo:

l/4r

ot l2l

c8 4?01

At? L2R2
AL? t29t
r l712n4
ll ?t2r 5
^l ?^2nö

069a-412 3
o 6 9 A - 4 1 23
0684-4701
06a4-470 I
0698-41 2 3

R:FXD ftET FLll
R:FXD ||ET FIr{
R : F X O C O r l P4 ?
R:FID COtiP 47
R:FXD LET FLll

lt l./sr
lt t/81
l/4r
l/4r
lt l/8f

28480
28480
ol l2l
28{80

069A-{123
0698{123
c8 4701
cB 4tol
069A-{123

ll?rzl?

al20-1a55

CABLE:RIBBON

28480

at2(F1855

t

I
l2

I

I

REilOTF

See introduction

ISNIATION

l/8I
l/Ol

ASSY

PHOTO
PHOTO
PHOTO
PHOTO

{99 oHil tt l/81
oHft lot l/41
OHtt lot l/al{
{99 OHt{ l: l/8y

499 oHli
499 oHH
OHlt lO!
(l|{l{ lot
a99 OHn

BOARDASSY

to this section for ordering

0tr2r

information

6-l?

Model 3490A

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Reference HPPartNumber
Designation

otv

Description

Mfr
Code

Mfr PartNumber

422
A22API
^22U1
A22U2

03490-60 302
03490-04l l4
1990-o40 2
1990-0402

SYSTEIl I SOLAT IOI{
PIATE:SYSTFX LI
rSTR: PHOTO
ISTR: PHOTO

2 8 48 0
28480
28480
28480

o:|49(F60302
o349(FO4t l4
1990-0402
1990-0402

^ 2 2A l
1 2 2 Ä l RI
^22^tF2

01490-6652_2
0684-a22t
o6a4-lo2 I

INGUARD SYSIET ISOLATIOiI BOARD ASSY
R:FXD COIP 82OO O|t{ tot
l/4ta
R:FXO COarP 1000 ortt
lof
l/4t{

2A4AO
ol l2l
oll2l

0349(F66522
cB 8221
c8 lo2l

a?2rlut

t820-0586

IC:TTf

1 20 4 0

Dat74LO4t{

A22A2
22^2Cl
^22^242

o3+90-66524
1 8 5 + - O O ?I
l 8 54 - O O l I

OI,TGI'ARD SYSTE}I ISOLATION BOARDASSY
f stR:sl
NPNtsEl.EcrED FROt{ An3704t
TSrR:SI
NPNIS€I,ECTEO FROI' 2N3704l

2A4AO
28440
2A4AO

03490-66523
l8 54-OO7I
I a54-O07 I

^22^2Fl
422^2F2

06a6-470 I
0684-470 I

R:FXD COflP 47
R:FXD COI{P 4?

oll2t
oll2l

ca 4701
cB 470t

424

ot490-66521

I

S/H

24480

0749(J-66524

A24rP I
A24|/.P2

4{r40-o748
4040-o"152

2

txTRACTOR:PC 80ARO.
FXTRACTOR:PC 80ARO,

8t_AC(
YELLOT

28440
28480

4{)40-o?48
1040-o752

,24e1

0698-OOA{

I

R:FXD I'ET FLil 2.I5K

fHil

2A4AO

0698-OOA{

^25

03490-6t 525

I

S/H

LOGIC JUI{PER ASSY

28480

0349(F66525

^ 2 5 A PI
^254P2

4040-0744
4040-o75 3

2

EXTRACTOR:PIC8{)ARD, 8f ACx
EXTRACf.b{:PC .8o^-Ro. GREFN

28480
28480

4040-o748
4040-0753

426

ot490-665?6

I

RATIO JI'IIPFR ASSY

28480

03490-66526

^ 2 6 X PI
A26r4P2
A26AP1

I 200-o76 a
4040-o748
4040-07 5 /r

9I506
28480
2A4AO

3r4-aG5D-3R
404{)-o748
4040-0754

^27

01490-66527

I

SAXPLE/HOID ANALOG AOARD ASSY

284AO

o1490-66527

a 27 C l
427C2
^27C5
427C6
^2'tc7

ot 60-2 I 98
o 160-2l9 8
0 18 0 - o l 9 ?
otao-ot97
ol 80-0197

2

C:FXO ltlcA 20 PF 5l
C:FXD IICA 20 PF 51
C : F X D E L E C I 2 . 2 t , F l o i 2ovDct
C : F X D E L F C T2 . ? . U F I o I 2 0 v D c t
C:FXD ELECT2,.2 IJF IOZ 2 0 v m r

72t36
72t46
562 89
562A9
562 89

ROfll 5C200J3C
ßot1l 5c 200J3c
t 5 0 D 2 25 X 9 0 2 0 A 2 - D Y S
l5 o 22 5XeO20A2-OYS
l 5 0 D 2 2 5X 9 0 2 0 4 2 - O Y S

A2fCA
427C9
^27CtC
l27C I I
^ ? 1C t 2

olao-ot97
ol 60-0679
o t60-i85 5
ol 60-3 077
ol60-1tl 9

c:FxD
c:Fxo
c:Fxo
c:Fxo
c:Fxo

ELFCI 2.2 UF lOt 2oVOCI
I E F L O i l 5 6 ' J OP F 5 r l 0 0 v D C t a
P0LY 5600 PF 5t 1ooVOCn
HY 0.027 UF lot loovDcr
o.l trF l00vDci,

56259
2a480
284A0
562 89
28480

I 5 ü)22 5 X9020A2-OY S
ol60-0679
ol60-1855
225P 2739t$t-PNA
ol60-341 9

l2?c l4
L27Ct5
^ 2 7 C t6
^ 2 7C t 1
^27Ct€

ol60-2199
ol60-3622
ol 60-1 t 83
o160-2199
ot 60-31 83

c:FxD
c:FxD
c:FxD
c:Fxo
c:FxD

Htca 30
cER O.l
t{Y 0.47
Hlca 30
f,iYo.+7

28480
729a2
a44tl
2a4AO
84411

ol 60-2 I 99
8l 31 -l OO-65l-l 04Z
HEI' IOI
ol 60-2 199
HFH 1O1

1 2 7 CI 9

ol60-2t99

C : F X D l l C A 3 0 P F 5t 300vocr{

28480

ol 60-2 199

r27;t I
r27Ct 2

t90 1-oO40
1 9 0l - 0 0 { o

o I n D E : S I L t C O t {5 0 xa 30 9v
D I O D E : Sl t I C n i l 5 0 taa 30 rv

o7263
07263

FDGI088
FD6l 088

LP HEX II'IVERIER

oHh LOt
OHF tot

ANALTE JU'lPER

l/4t
I/tta

ASSY

It

SOCKEI: INIEGRATED CIRCUIT
EXTRACTOR:PG BOARDT ALAC(
EXIRACTOR:PC 8OARD. SLUE

I
I
2
I

See introduction

PF
UF
UF
PF
trF

I/8II

14 coNTAcI

5t tooyDcr
+80-20! IOOVDC|'
zCt 50VDC|
5t 300vDcl
20t 5ovocP

to this section for ordering

information

Section VI

Model 34904

T o b l e 6 - l . R e p l o c e o b l eP o r t s l C o n t ' d )

Reference HPPartNumber aty
Designation

t5

Description

Mfr
Code

Mfr PartNumber

35V
35V
35V
35Y
50 llA 30

2A4AO
28S80
2E480
284 80
0726A

l90l-o376
190l-0376
l90l-o3?6
l90l-0376
FD6l 048

284 80
2844O
28480
2|N4AO
28480

l90l-o3?6
l90l{376
l90l-o376
1902-31EO
1902-3lao

DIODE:SILICON
DIOD€:SILICON
DIODE:SILICON
oloDE:slLlcoN
DIOO€:SILlco||

^27CR3
^27C41
A27CR5
^27CR6
A27CR1

1901-o376
l90l -oi76
1 9 0l - o 3 7 6
l90l-0376
190 l-0040

l27CR 8
)27Ct9
a2?cR lo
A27CRt2
A27CRl3

l90l -o376
190l-o176
1 9 0 1- 0 3 7 6
leo 2-3 180
1902-3I 80

a 2 7 C Rl 4
A??CRI 5
i2?ca l6
lz?cR I 7
A 2 ? C Rl 6

190 l-oo40
190 l -o376
190 t-o376
190?-3 I 9 I
1 9 0 2 - 3r 9 I

DInDE:StLICON
50 lrA 30 tv
DIOD€:SILICON 35V
DIOOE:S ll-ICON 35V
D I T J D E B R E A K O O I I N :I 3 . O V 2 I
DIOO€ BREA(DOtr{: l3-OV 2t

07261
28480
2844O
28480
zA4AO

FDGI088
l90l-o3?6
t90l-o376
1902-319 I
1902-31 9t

A 2 ? C Rl 9
A27CR20
^27CR22
^27CP23
^27CR21

l90l-037 6
1 9 0t - o 3 7 6
I 901-0376
1902-l 19 I
1 9 0 2 - 3 19 l

DIOD€:STLICON:}5V
DIoOE:S ILICOI 35v
DIODF:SILICON l5V
DIODE BREA(OOyN:13.0V 2t
D I O O E A R E A K D O r . f { :l 3 - O V 2 t

2A4AO
28480
28480
264AO
2844O

l90l-o376
l90l{)3?6
l90l-o376
1902-31 9l
1902-319 I

^27CA25
^27Ce26
^27tR27

t90 l-o 37 6
l90l-0376
1 9 0l - o 3 7 6

OIoDEss lLICOri 35v
DIODE:SILICON 35V
oloDE:s ILlcoN 35v

2E460
28480
28t80

I 901 -0376
r90l-0376
I 901 -o3?6

l2?ßl
^27K2 .
A27l-I
427L2
l2?13

o490-o373
o490-o373
9t ?o-0894
9l 70-oa94
9l 70-0494

RELAY:RFET)
R E I .A Y : R F F N
E E A O : S HI E t D I N 6
B E A O 3S H I E L O I N G
R€AD: SH I EL DI iIG

2A4AO
28460
28+ 80
28460
2 8480

0490-037t
0490-0373
9l?o-0894
9l ?o-o894
9170-oEgt

2

2

DIODE:SILICON 35v
DIODE:S ILICON 35Y
DIODE:SlLlCOt{ 35V
D I O O E A R F A K D O I ' N :I I . B V
olooE aREAKDO$I:ll-8V

lV

2I
2l

600 Hr
400 tr

^27L4

9 t 70-o894

BEAT': SH I EI.D I ilG

28480

9t ?0-0894

A27rPI
A27AP2
^27nPt

4040-074A
4(}40-0752
1200-o4t7

E I T R A C I O R : P C A O A RD ' B L A C X
EXTRÄCTOR:PC AOARD. YELLOI
Sü:(ET:IC
A PIN

28480
28+80
.l7l l7

404{FO748
4040-0752
5566-2t'-5

t27tP4
A27rrP5

1200-o4?4
0340-o060

soc(€T: Ic l4-Plra
FEEDTHRU : INSULAT€ D Tü'NT ING

28480
28480

1200-oa76
0340-0060

^2ZOl
^2702

1855-0093
la55-0304

rSTR: FET THHANN€I.
TSTRsSI NPN DT,AL

28480
28480

1855-O093
I 855-030A

42703
^2704
^2705
42706
^2707

la55-oo9 3
I I 55-O093
ra55-009:t
I 455-030a
1855-O09 l

TSTR:FEI N{HANN€L
N-CHANiIEL
ISTR:fET
TSTR:FET N.CHANNEL
TIPN DUAI.
TSTR:SI
lSf R: F€I l{-CHAI{NEl-

2A4AO
24480
2A480
2a4ao
28480

1855-OO93
la55-oo93
1855-O093
lE55-030r
la55-o$r3

A2708
A2?O9
42701I

l8 54-02 I 5
la55-o003
l8 55-O:!41

TSTR: SI NPTI
f Sf R: FEI tl-G{tAlMt
.-i
rSfR:Sl
FEt N-CHAM{El.

80131
24480
t1127

2N3904
1.855-0O93
2t{4338

R:FXD IET FLfr lK Oil. lt t/al
R:FXD ftET Ftr 3.OtK ürrl lt t/8t
R :V/lR FLfi 5( (ttft lo! L I it 1/21
n,:Fxo FLH 649 oHf{ lt 1/81
R:FXO r{ET FLt 34a OHt lt l/81

zA4AO
28480
28480
2A480
20a80

0757-()280
075t-o27t
2l o(>2449
069A.*60
069a-3445

ß.:vaR cERfrEl loK &rr lot Typf p 3/4r
R:FXD Ft-l{ 20|( fl.ilt lt l/8h
R:FXDFLX 20K OHtll: l/Eh
R:FXD l|ET FLll :tO.lK fItX lt l/8X
R:FXO r{ET FLX l0.O( O{lt lt l/al

2A480
28480
24t80
28480
28480

2loo-31 o3
o?5?-o{49
o75?-O449
o?57-0451
0757-O+12

I

/.'
A 2 7 RI
A27N2
A2?R3
427R4
A2?R5

0 7 5 7 - O 2 80
0757-O27t
2t oo-2{a9
o698-+460
0698-3!r5

Ä27R6
l2?R8
427R9
a2?nl o
l27Rl I

2loo-31o3
o?57-O{49
o757-()4+9
075?-O453
o757-0442

A27Rl 3
127Rla
t2?Rl 5
A 2 ? R T?
^z'tR t I

2 loo-3306
2l oo-33 I I
o?5?-0449
0757-0449
0684-4?3 I

R:YAR CERXET 5OK (Hli lol rYPE p 3/4ta
R:VAR C€RtEr 500 a*ilt lot TYPE p 3/tI
R:FXO FLX 20X OH|| lt l/8r
n:Fxo FLt 20K oHx tt l/8y
R : F X D C O I { P4 7 K O H I { l o l l / { L

28480
28480
28480
24480
otl2I

2100-3306
2l oo-33 1 I
075?-0t{9
o7t7-ott9
cB 47tl

Ä2?RI 9
427e20
A27P,2l
^27F,22
Ä27e,23

o6E4{?31
0698-4505
069A-4505
0698-f9.5
075?-o4t8

t:FxD colrP 4?t( oHfr lot l/al
R:FXD t{ET FLll 7l-t(
$tr lt l/8ta
R:FXO XFT FLlr 7l.t(
0fili lt I/Ar
R:FXO r|€l FLI 34a OHl| l: l/8r
R : F X O l l E l F L t 5 - l l K O H l , ll t l / 8 r

oll2r
28480
28480
28tAO
2At80

cB a?31
0698{505
0694-+tO5
069r-3445
o75t-0438

^27s21
^27t25
^27e28
l2?F29
^27R30

o7t?-o4:t8
o7 5?-0+65
0757-()449
o?57-O43 I
o?57-()465

R:FXD tET FLX
R:FXD l,lET FLll
R:fxD FLfl 20(
n:FxD ltET FLx
R:FXO ||Et FLt

28480
28480
28480
24480
24t80

.o?t7-043 I
o757-()465
0757-().49
0757-O+3E
0757-{t465

I
I
2
I

See introduction

5.11( tltit lt t/8ta
IOOX Olfl ll l/Sa
()|il lt l/aY
5.llK ülft ll l/Ar
IOOK (x{i lt l/ff

to this section for ordering

information

6-19

Section VI

Model 3490A

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s l C o n t ' d )

Reference HP PartNumber Qtv
Designation

Ä 2 ? R 3I
^27P.a2
^27R33
A27Rt4
^27Rt5

o757-0149
o757-O40 I
075T-0r'r65
0698-3162
0757-ü42

427R36
427R3?
427R3 €
l2?R19
127R40

Description

Mfr
Code

Mfr Part Number

OHH lt
l./Ar
IOO OHri tt
l./8tt
loo(
oHa lt
t/a.
46-{(
Otil lt
l/8r
(I{lt l:
lO.O(
l/Al

24480
za4ao
24480
28480
24480

075r-o149
0757-OtOl
o?57-Oa65
0698-3162
0757-o1/r2

R:FXO
R:FXD
R:PXO
R:FXD
R:FXD

FLH
ilET
äFf
IET
|lEl

o757-O401
069A-3 I 62
0698-450 5
0698-4505
068+-47:r t

R:FXO
ta:Fxo
R:FXD
RsFXD
R:FXD

HET
l|FT
t{ET
ltET

FLx IOO OHra t!
l/gy
FLfr 46.4|< OHI ll
l/8r
(l{H lt l/ara
Ftt
?l.5K
FLlt ?I.S(
OHtl ll
l/81
COI{P 47K 0H|| lot
l/41

28480
2A4AO
28480
24480
oll2t

0757-()4Ol
0698-3162
0698{505
0698-4505
cB 4731

427R43
^27F'44
zfe4t
^27?16
^27R41

0757-0449
o75?-O438
0757-0449
o757-0449
06a4-473 I

R:FXD
RIFXD
R:FXO
R:FXD
R:FID

Ffr{ 20(
ttET FLfa
FLX 20|(
FLX 20t(
COIIP 4?(

28480
2A4AO
2A4AO
28480
oI l.2t

o757-O449
075?-O438
0757-O41i
0757-04+9
ca 4731

12?uI
^27U2
27U3

I 826-OOt9
1 8 2 6 - O O lI
1826-OO59

IC:LIII.
OPERATIONAI ATPItFtFR
IC:LTNEAR OPERA'Io.AL
AIiPL TFIER
IC:f lil.
NPERATI0NIL AXPLIFI€R

12()40
28480
12040

LX20lAfa
1826-OOl I
L120lafi

427U4
^27U5
^271t6
427U7
^27üA

1826-OO59
l8 26-0O2 I
1826-OOt 9
1826-0O59
1820-t02 I

IC! LIN.
OPFRATIONIL AIIPt IFIFR
lc:voLTAGE
FOL| OTER O TO ?O C TO-99
IC:LIil.
OPFRATIoilIL
A|IPL TFIER
TC:LIN.
OPER,ÄTIO'{AL A[PI- IFI€R
IC:DI6ITAL

12()40
12040
12040
t 2040
24480

Ln20 latl
Ltt3lot
LX20 lArl
Lt|20tAtl
1820-lo2 I

^27U9
A2?UlO

t820-t()2r
1820-ot 74

IC!DIGITAL
IC:TTL
HEI

2A4aO
ot295

I 820-lO2l
sN7404N

428

0349(F6652I

tssY

24480

03490-66525

^2acl

ol 60-3077

c:Fxo

toovtf,y

562A9

225P2739t81-PfX

a2ac2
^24c3

ot 50-ooa4
ol60-260 5

C:FXO CFR O-t UF +aO-2O! IOOVDC|I
c:Fxo
cER o.o2 tFD +80-201
25YOCI

72942
72942

8l3l-loo-651-l
o4z
5835000-V5U 2032

l28Cß I
l2acR 2

190l-o5l 8
1902-3183

OIOI)€:HOT CARRTER
DIOOF:8R,ft(DO*N
IZ.IV

28+80
2A4AO

l90l{5 l8
1902-31 A3

^28lrP I
^?AAP2
^28tP)
t2araP4

4040-0748
4040-o753
t200-0F.74
1 2 0 0 - o 4 73

2844O
284AO
28480
2844O

404{FO748
{o40-0753
t200-o{7{
1200-().?3

a 2 8 X P5
Ä 28 t P 6

1200-0469
o3ao-o8 32

s(f,KET:rC
28 CONTTCT OUAI--Il|t tNE
STAilO0FF:Stl6E
rypE o.5OO. t-G

23480
00000

1200-0469
OBD

28480

l85a-oo7l

ol12t
oll2l
ot l2l
oll2r
0ll2r

c8
c8
cB
ca
c8

2

5

I

2

I

I

sanPLE/HOIO

zOK
FL||
F|.r|
FLX
Fl-fl

0t{x lt
l/afl
(}{H la
5.llK
OHtt lt
l/8r
OHl| ll
l/8r
OHil lot
r/4r

INV€RTFR

[(rtC

r{Y o-o27

uF

ßotRD

l0t

EXTRACIOR:PC'&IARDT
EXTRACTOR:PC 8OARD.
StrK€T: IC [{-PIN
socKET: IC l6-Ptil

4

l/8u

2t

{00||1

BLACK
G8,EE1{

1 2 8 0t

la 5{-oo7 I

TSTR,:SI

A2ARI
428R2
r28R3
A26Ra
1 2 8 R5

0 6 8 4 - t O 3I
0684-332 I
0684-562 I
0684-682 I
0684-lOt I

R:FXD
R:FXO
R:FXD
R:FXO
R:FXD

Ä28R6
428R7
a2sis
a2an9
A28Rl0

06a4-3321
0684- l03 I
068+-562 I
ta lo-oo50
tSto-oo50

R:FXO COI{P 3300 or|{ lot l/4tJ
R:FXD COTP IOK OHX IOI L'1Y
R:FXD CO|{P 5.6K O}t4 lot l/ar
R€StStM
ft€TyoRt(10 r l5K oH,. lot
R€StSTtVE r{€TtfiR( LO I I5K OHrl 1 0 t

oll?l
oll2l
oll2l
?84AO
28480

c8 3321
ca lo3l
co t62l
lal0-0o50
lslo-oo50

l28Rl I
4 2 8 ßI 2
a28Rl 3
a28Rl 4
a28Rl t

o6a4-56?,1
06a4-562 I
o757-O116
o75l-O2A)
068a- lo2 I

R:FIO
R:FrD
R:FXD
R:FID
IIFXO

0 1l 2 l
ol12r
28480
24t80
0l t2l

ca 5621
c8 5621
0757-O446
0757-OZA1
cB lo2l

l2a ul
^zau2
l?6u3

Ia2(FO5a3
tE 20-o65 8
I 820-0596

I C : T T L L P O T , A D2 - I I P T x A N D 6 A T E
IC!TTL LOl. POT'ERA-IIfUT I{I.I-IIPL€XER
IC:TTL LP Ourl eOee TRt€. O F/F

12040
of 263
l2 040

Dlr74l_ooN
sL I 7l{6
DX74L?tN

A2AtrI
12ar,,.
^2 CrtS
r2aJ6
^24i7

l8 20-06 5a
1820-0656
lE 20-o6 56
1 6 2( F O 7 0 8
It 20-o47 I

IC:TTt t_Ot potER a-tilput
r{lrtptEt€R
IC:TTT LP 4-BIT 2-INPI ,{ULTIPLEX€I
TC:TTI- LP 4.8IT 2-INPI IUTTIPI-EXER
l C : f T L L O t p O r a E Rq J l L { - n r p t r u l f t p l € I
lC:ffl
H€X INVERIERr/OPEr| CO-L.(3ovl

07 26i,
o1295
o 12 9 5
0726t
ol 295

sLr 7146
sN74L9Ail
sN74L98N
lJ6893t0959I
sN7406N

3

2

See introduction

NPNISELECTED FR0II äI3704I

COilP
CO}|P
COftP
COxP
CO|{P

IOK (}tft lot
I/4t
3300 or+t lot
l/4r
5.6K
OHri{ lO!
l/{r
6.8t( Ofil l0!
l/41
IOO OHl4 tot
tr..y

COIP 5.6t( Orlt
C O X P5 . 6 K O H l
HET FLt{ t5.O(
ltET FLt{ z.OOK
COIIP lOO0 Orl.t

lo:
lot
(H||
oila
t}t

l/41
l/4ta
lt l/ar
lt l/8y
ttfl

to this section for ordering

information

ro3l
3321
5621
6821
roll

Model 3490A

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r l s ( C o n t ' d )

Reference HP PartNumbel oty
Designation

Description

Mfr
Code

Mfr PartNumber

428U9
a2aul c
A2gul I
A2a$12
a2auLl

I 8 20 - O 0 9 9
l8 20-o6 56
I 82 0-O9aO
lB 20-o59 8
I 82 0- 0077

IC:TTI 4-AIT BINARY COUNTER
IC:ITL
LP 4-8IT
2-INPT
li|U|.TIPI-ExER
IC:DI6TTAt
CXOS H€X ruFFER/TRANSLAT0R
IC:TTL LP OUAO 2-INPT EXCT. oR GATF
IC:TTL OUAL D F/F

o1295
ol 295
2a4AO
12040
01295

sN7493N
sN74L9aN
1820-o9ao
Dra74L86N
sNTt?4N

t a28r,l4
a28Ul 5
a?8ut 6

t8 I 8-2094
1820-0656
1820-oe35

IC:N-CHANNEL RO'i
IC:TTI. I.P 4-BIT
2-INPI
IC:DIGITA[
CilOS I4-BII

28480
ol 295
2A4AO

l8l8-2094
sli 74L98il
I 820-093 5

429

ll I ln-66501

OUTGI'ARO TRIGG€R ASSY

24440

rllls-66501

^z9cl
^2ect
429C4
^29C5
429C6

ol 80-251 t
o180-0228
ol 50-o05 0
ol 70-o040
ol 50-o05 0

C:FXD
C:FXD
c:F-xD
C:FxO
c:FxD

?8480
56249
562 89
562A9
562A9

ol80-25 I I
1 5 0 0 2 2 6 X 9 0 15 8 2 - O Y S
co678 lo2 E IO2ZS26-CDH
192P4?392-PTS
c067alo2 El02 zs 26-cOH

a29CRt
^29C42
^29CR)

1 9 0l - o o 2 a
I 902-O04 9
190 l-oo40

DIoD€:SILICON 0.75A 4OOPIV
T'IODE:BREAKDOIiN 6.I9V
5I
DInDE:SIllCOil
50 t1A 30 XV

o47lf
04 ?t:1
o7 263

sRl358-9
sz I c939- 122
FDGIO8A

t29raP I
4290L
429o2
^290t

L25L-2551
ta54-oo22
I 8 5 4 - O 0 7I
l8 54-OO7I

C O N N E C T O R :S I N G L E C O N I A C T 1 4 I N I A T U R €
TSTR:SI NPN
TSTR:Sl
NPN(SEL€CrE0 FRO|{ 2N37O4l
rSTR:SI NPNISELECTEDFROI{'{37OtI

0o779
o7 261
2A4AO
284AO

332070
st 7843
I 854-OO7I
I 854-O07l

A29RI
429R2
429ß3
129R4
^29R5

o6a4-l 03 I
o757-O388
0684-822 I
0684-lOl I
0684-t 23 I

R:FXD
R:FXO
&:FXD
R:FXD
R:FXD

0ll2l
28480
oll2L
o Ll 2 l
oll2l

cB lo3l
o757-Or I 8
cB 8221
cB lot l
c8 t23r

429R6
429F7
^29R4
429R9

.16a4-2271
06a4-l 02 I
0684- lO2 I
06a4-a2?L

R:FXD COhP
R:FXO COfiP
R:fxD
coxP
R:FXD COI{P

oll2l
otl2l
olt2l
orl2l

c8
CB
c8
c8

a29r I
A29UI
429W6
A30/A35

9too-3?.71
la20-o5a6
03490'-61617
0ß490-60it13

2 8 48 0
l2 0+o
2A4AO
28480

9loo-tz7a
DH74LO4N
8490-61617
ß490-6ß13

A30/A35U1-U11

1990-04(I2

430

o3490-66530

I

a30cl
^toc2
430c3
t30c4

0180-170r
ol 60-ol 56
ol 50-o093
Ol 5OrOO93

I

a30cR I
^3ocR 2
a30cR 3

190 t-o040
1902-3 03 0
190 l-0040

2

r30tP I
a30t'rP2
A30XP3

2

AL ELFCT
ELECT 22
cER 1000
ttY 0-047
cER looo

CO|IP IOK
FLI 30.1
COXP 8200
COriP 100
CO|4P tzK

I'UI-TTPLEX€R
8IN!RY coUNTER

f7O UF 2OVDCI'
UF lot
r5vocta
pF +80-20t
looovocta
UF lot
2 O0VmX
pF +80-201
looovocy

OHt{ lot
I /4}l
OHt{ 1t l/8L
oril,t lot
l/4r
ot{r{ lot
l/41
OHrt tot
l/{x

22K o+ttt lot
IOOO Oltl lot
looo
oril
lot
82Oo Otlll lot

r,/4t
trr.Y
l/4t
l/41

22!l
I 02l
I 02l
a22l

T RANSFORXER: PUI,SE
IC:TTL LP HEX INVFRT€R
CABLE ASSY:TRIG
ASCII ISOLATION ASSY: INCLUDES
A3O,A35AND U.I THRU U11
TSTR:PHOTO.i
OUTGTTARDrSOt-ATloN
ASCil
^SSY

28480

1990-0402

204 80

03490-66530

C:FXD ELECI 6-8 UF 20t 6VOCtl
C:FXO l,lY 0.0039 UF lot 2oOVDCta
C:FXDCERO.01 UF +8O-2Ot IOOVDCT
C:FXD CER O-Ol UF iao-?O: lOoVDCl

2E+EO
562 89
72952
729A2

ol80-l?ol
t92P19292-PrS
8 0 1 - K 8 0 0 0 1I
80 1-r(8000 I I

oloDE:stLlcoN 50 t{a 30 rv
O I O D E B R E A K O O T * { : 1 . 0 I V5 1 4 O O ü r
DlOftE:SILICON50 ilA 30 lty

o7263
28480
o7261

FOGIOa8
l9 02-30 30
FDGI088

l2 00-o43 L

SMKET: IC 24 CNNTACT

28480

I 2 00-043 I

1 2 0 0 - 0 4 73
t2 00-0474

S O C K T Tl C
: 16-PIN
S(fK€r: lC l4-PIN

28480
28480

L200-047t
l2 00-o474

4300t
a:too2

la54-oo7 I
l 8 5 4 - O 0 7I

TSTR:SI
rSTR:SI

NPNISELECT€D FRON
NPNISELECTFD FROT

28480
24480

1854-OO7l
l8 54-OO7I

43003
43004
43005
^3006
43007

la54-oo7 I
I 8 5 4 - O O 7I
la 54-OO?I
t854-O07l
l8 54-O07 1

TSTR:SI
TSTR:SI
TSTR:SI
rSTR:SI
TSTR:SI

N P N I S E L E C T E D F R O I I 2t{3704 |
N P N I S E L E C T E D F R O I 2N3704I
N P N I S E L E C T E D F R O I 4 at 3704 |
N P N I S E L E C T E O F R O I { 2r{31o4|
N P N I S € L E C T E D F R O I { ?'{ 3704 I

28480
28{ 80
28480
28480
28480

I 854-OO7l
I 854-OO7I
I 854-0071
1854-007I
I 6 5+-OO7I

a 300a
13009

I 8 5 4 - O 0 7I
l 8 5 4 - O O 7I

TSTR:Sl
rSTR:SI

NPNISEL€CTCD FRot{
NPNIS€LECTEOFROX

2N1?04 I
ät 3704 t

2A4AO
28480

1 8 5 4 - O O 7I
t 854-00? r

A 3 O RI
I toR2

0684-1021
06a4-3131

R:FXO f.Ol,lP 1OOO OHlt LOI tt4ta
R:FXD COilP 33K (ttx lol
l/4fl

ol. t 2l
oll2l

cB lo2l
cB 3331

1
1

A

See introduction

2N3704t
2r{3704|

to this section for ordering information

6-21

Model 3490A

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Reference HPPartNumber oty
Designation

Description

Mfr
Code

Mfr PartNumber

R:FXD
R:FXD
R:FXD
R:FXO
R:FXD

CO'{P
COftP
COHP
COXP
COIIP

6.8K OHM l0l
l/4tl
33K OHl,t lot
l/41
33K fHl,r 101 ll4U
560 oHN lot
l/41
6.8K OHt{ lot
l/41

ol t?l
ol l2l
ott2l
0 11 2 1
ol l2l

c8
ca
ca
cB
ca

6821
3331
3331
56ll
6821

R:FXD
R:FXD
R:FXO
R:FXO
R:Fxo

C.OilP 6.aK OHll l0l
l/4x
CONP 6.8K OHl.r tol
l/41
COIIP 6.AK OHf{ lot
l/4rl
COI|P 6.AK OHfi IOZ llt*l
COMP 220 OHM 10961/4W

oll2l
oll2l
ol l2l
oll2l
0 11 2 1

cB
cB
cB
c8
cB

6821
6821
6821
6821
2211

01121
01121
01121
0 11 2 1
ol l2l

cB
cB
cs
ca
ca

2211
2211
2211
2211
lo31

oll2l
01121
01121
01121
01121

c8
cB
cB
cB
cB

lo3l
1521
1521
1521
1521

o't121
olt2l
01121

cB 1521
c8 6821
cB 2211

ot263
ol 295
12040
ot29,
oL295

sL l731 5
st{?438N
oil?4L04t{
sfi74150N
sN7{04N

l2 0io
01 261
l2 040

olt74l51N
sL17315
Df{?4LO4N

OI'TGIIARDIIOTHERSNARDASSY

2844O

0349G-66531

0t80-25t I

C:FXD AL ELFCT 370 UF zOVDCII

28480

ot 80-25 I I

^ttc2
Ä 3l c a
^3tc4
a3lc5
13lc6

0 r80-251 I
ol ao-ot 97
ola0-o22 9
ot 50-o050
ol80-01e7

C:FXD
C:FXD
C:FXD
c:Fxo
c:fxD

28480
562A9
28480
56249
562A9

ol 80-25 I I
1 5 0 D 2 25 X 9 0 20 A 2 - D Y S
ol ao-o2 29
co678102ElO2tS26-CDH
t 500 22 5 X9020A2-DYS

l3lc7
t3lc8
a3lc9
a3lct c

ol 50-o05 0
o 170-o040
ol 50-o050
ot 50-oo93

C:FXO CER lOr)O PF
c:FxD l|Y 0.047 UF
C:FlD CFR IOOOPF
C:FXDCER O.0l UF

56249
562 89
56249
729a2

co67 8102 E l02zs 26-coH
1 9 2 P 4 7 39 2 - P T S
c067 Bl o2 ELO2ZS26-COH
8 0 1 - K 8 0 0 0I I

l 3 I C RI
13 lcß 2
r? lcF 3
l 3 l c F4

l90l-036f
l90l-0363
1 9 0t - o o 4 0
1 9 0I - 0 0 4 0

DIOD€ASSY:SI IOO PIV PFR CELL
O I O D EA S S Y : S I I O O P I V P E R C F L L
oIooE:slt-lcot{ 50 l.a 30 Uv
o I o D E : S I L I C O N5 0 I A 3 0 t V

za4ao
28480
o 7? 6 1
or26l

l90l-o3 63
1 9 0 1- 0 3 6 3
FOGI088
FOeloSa

l3lcF:
r3 l;p 6

1 90 2 - 3 1 9 0
I 901 -O()4O

D I O D € E R E A X D O H N : L 3 . O5V1 4 0 0 l , l l l
otooE:srLlcoN 50 La 30 Hv

2a4AO
o726)

t902-3 I 90
F D G I0 8 8

r_:lJl

l25l-1365

coÄ,N:Pc44 l?.x221 coNTAcTs

7l 785

252-22-)O-aOO

A3OR3
A3OR4
430R5
A30F6
a30Rl2

0684-6n2 I
06 84-33i I
06a4-333t
0684-56r I
0684-682 I

a 3 0 RI 3
a30Rl4
a30Rl 5
a30Rl 6
a 3 0 RI 7

ooa+-oaz
06a4-68?
0684-6A2
06 84-682
684-2211

a30RI I
a 3 0 RI I
430R20
4 3 0 R 2r
AaoF22

06'8/.,2211
ß44-2211
ß44-2211
068/,-2211
0684-lO3 t

l30R23
a 3 0 R 24
aloR2 5
1 3 0 R 26
A 3 O R 2?

0644-l o3I
0684-1 521
068,r-1521
068/t- 1521
0684-1521

^ 3 0 R 2t
130R29
A30R30

0684- 1521
o6a4-6421
0684-2211

^30u1
430u2
A3OU3
Atot14
A3OU'

1820-o?l o
1820-o62 t
l8 20-o 5a6
la2(F0640
1820-o174

A30U6
430{r7
a30lr8

t820-0590
t8 20-o7t o
I 820-0546

I

IC:ITL
LP DtlÄL 2r a-1.2-2
lN
IC:OIGITAL TTL+I.OGIC 5V 5I
IC:ITL
LP HEX INVERTER

afl

01490-66531

I

13lcl

i
I
I
I

I

A.

II

A
/Ä

,A

R:FXO COMP
R:FXO coMP
R:FXD COMP
R:FXD COMP
R:FXD COIIPIOK
RIFXO
R:FXD
R iFxD
R:FXD
R:FXD

ll

l*

A
A

220 0H&
220 ot+,
220 oHr
220 oHn
olü lot

10961/4W
lM 1/4W
lW" 1l4W
1trÄ 1/4W
t/tl

COf{P IOK OHr lO? 1/4H
COMP 1500OHM 10% 1/4W
COMP 1500 OHM 10961/4W
COMP 1500oHM 10%1/4W
COMP 1500 OHM 10% 1/4W

R:FXD coMP 1500oHM 10% 1/4W
R:FXD COXP 6.aK OH,l l0l
l/41
R:FXD COMP 2200HM 1ü6114W

A

7
t

lC:oIGITAL
TTL+LOGIC tV 5l
NAI{O SUFFER I/OPEN
IC:TTL OUAD 2-II{PI
IC:TTT fP HEX INVERTER
IC:TTL
DATA SELECIOR/IiULTIOtEX€R
HEX INVERTER
IC:TTL

See introduction

C

ANO-OR INv

A L E I . E C T3 7 0 U F z O V D C T
ELECT2.2 UF lol 2OVm.B
EI€CT 33 UF lol IOVDCH
cER looo PF +a0-201 looovocr
EL€CI 2.2 UF lot 2oVDC|.
+8G-2Ol IOOOVDCT
l0l zoovD(.ll
+8O-2Ol IOOOVDCI{
+8(F?Ol IOOVDCH

to this section for ordering

information

A Re{er to B&kddir€

Sec. Vrll

Section VI

Model 3490,{

T q b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n r ' d |

Reference HPPartNumber
Designation

I

1

Mfr
Code

Mfr Part Number

CONN:PC 44 l2X22l
C0NTACTS
coNN:PC 44 t2)/.22t CONTACTS
HEAT DISSIPATOR:FOR TO-3 CÄSE
C O N N F C T O R :I 4 - P I N r
DUAL- IN-LINE
S O C K E T :l C l 4 - P l I

7L7A5
7l?85
13l03
28480
2A4AO

252-22-30-300
252-22-tO-tOO
6l o4c-ToP
I 251-06t 5
1200-0474

STANDOFF:STUD }IOUNT
C O N N E C T O R : SI N 6 L E C O N T A C T } I T I { I A T U R €
NUT:HFX SST|_ 4-4OXl/4X3l32
6UIDE:Pf U6-II{ PC BoARD

o0000
0o779
80120
?8480

OBD
332070
oaD*
5040-ol 70

28480
28480

I 6 54-OO7I
I 854-O07 I

otv

Description

^31J2
A3IJl
^3 lr{P r
a3lt1P2
^atÄP3

L25l-1765
t25l-Lt65
L205-o?5e
l2 5l-061 5
t200-o47 4

^1lt4P 4
A3lllP t
^all1P6
^3 lxp ?

0380-l 036
L25t-2551
22t O-OOOI
5040-0 170

a3lol
A3tO2

1854-OO7I
1 8 5 4 - O O 7I

TSYR:Sl
TSrR:Sl

Ä:t lR3
A3lR4

0684-3221
0684-lOl I

R:FXD CO'{P 3300 oHr lot
t/{L
R:FXD COI{P lO0 oft}t lot
l/4ta

olr2l
oll2t

c8 3321
c8 loll

A3IR'
A3lR6
t3 lR7
A:]lR8
l3 lR9

o6b4-8?? L
l8 lo-0 t?5
l8 lo-o116
l8 lo-o I 36
0684-682 I

R:FXD COilP 8?00 (}l+l
RESISTIV€ NETI'ORK 5
RESISTIVF NFTTORK:
RFSlSTTVE NETIIORK:
R:FXD CDf,tP 6.at(
OHr|

oLl2l
28+aO
2 8 48 0
28440
otl2l

c8 8221
l8 ro-ot 35
I I r0-ol 36
lalo-ol:15
c8 6821

13lRl
l3lRl
13lRl
r3lßt
t3lRr

06a4-2211
06a4-l 23 I
0684-l O2I
06a4-4221
0684-l02 |

R:FXD
R:FXO
R:FXD
R:FXD
R:FXO

I l4r
tt4ll
tt4ta

oll2l
otl2t
or l2l
oll2l
ort2t

cg
c8
c8
c8
cB

13lRli

o6a4-2221

R:FXO COttP 2200 ol{,t lot

tl.*l

oll2r

ca 2221

A3trl
lalul

9l 00-327?
1820-043 0

T RANSFORI,IER: PULS E
IC:IINEAR,
VOLTAGE REGULAT(n 5V

?8480
?8480

9loo-3273
1820-ot30

l3lu2
A3IU3
131rr4
A3rW6
431W7

l8 20-o 174
1820-062 I
1.820-o 586
03490-61617
03490-61618

I
1

IC:TTI
HEX INVERIFß.
IC:TTL
OI,AO 2-INPT NAI{D EIIFFFR x/oPEN
IC:TTT LP HEX tI{VERTFR
CABLE ASSY:TRIG
CABLE ASSY:ASCIl

01295
ot295
t2 040
2Uü
z8r',Ao

sN740+l{
5lr7438rl
otT4LOtN
03490-61617
03490-61618

^32

ot490-665t2

I

OUTGIIARD ROT ASSY

24480

03{9(F56532

^32Cl
^t2c2
^?2C2
AtzC4

ol 60-0299
o I 80-l 741
ol 60-3a4 7
ol 50-o093

I
I
I

c:FxD | tY 1800 PF lot
200vocr{
C:FXD Et.FCr o.l
UF lol
35vDCt
c:FxD cFR O.0l uF +too-tot
2'vocr
c:FxD c€R o.ol
uF laG-201
loovDcr{

562A9
562A9
129A2
7?9A2

19 2P18292-Pr S
r500 l(}4 x9035a2-oY s
8005-o lAcB-H5R -l 03P
801-Kroool I

t32CR r
Aa2Cß.2

190 l-0040
190 l-oo40

DIODF:SILICNN
nIoDE:sIt
tfh{{

07 263
o7 261

FDGIOAA
FOGI088

Ä32rP I
,32,'? 2

4040-o7l 3
1200-043 I

26+dO
z8{80

40{o-07 I 3
1200-ot3 I

a32XP3
^32,4P1
a?2tc5

1200-0469
1200-04t 3
1200-04?4

SOCXEI:IC
SOCKET: IC
socKET: tc

28480
? 8t 8 0
28480

1200-o469
l2 00-0473
1200-o47a

A32RI

0684- t 23 I

R:FXD

ol l2l

c8 1231

^32R2
l32R:l
A:I2R4
A3?R5
432R6

o684-2221
la lo-0050
I I I O-O055
l8 lo-0055
0684- I 03 I

R:FXD COIrP 2200 oHa lot
l/4L
RESISTIVE NETI'ORX IO X 15T OHH IOI
RESISTIVE NET$)RK:8 ALL IOK OHX 5:
RFSISTIVE NETIIORI(:8 ALL IOK OHX 5I
R:FXD COüP IOK OHl4 tot
l/atJ

oI l2l
28480
28460
2A4AO
oll2l

ca 2221
1 8 l O - O O 50
l8 lo-0o55
I 8lO-OO55
c8 lo3l

A3?R7
A 32 R 8
l3?R9
^32RlO
A 2 ? R II

0684-l 03I
06E4-1 03 I
0684-l ot I
()684-l 03 I
0684- I 03 I

R:FID
R:FXD
R:FXD
R:FXO
R:FXD

l/4ra
l/41
l/4r
l/ir
1/4r

oll2l
0ll2l
ot l2l
oll2l
oll2r

c8
CB
ca
c8
CB

A32rt2

o6a4-t 03 I

R:FXD COItP tOK OHil lot

l/4r

or l2l

c8 l 0 3 l

3 2Ul
^42u2

1 8 2 0 - O 5 67
l8l 8-2 097

I C: Tll OUAI- vot.aAGE-C0NIRoLLEDr{rjlTI yt
ROK:N{HAl{NEI

0 47 1 3
28480

xc4024P
t8 l8-209?

At2u!
^3Z(l4
132U5
132u5

l8 l8-2098
I 82 0- 07a8
l8 20-o 5a6
1 8 20 - o 7 a 8

RO'{:N-CHANI{EI.
T C : T T I H E X D - T Y P EF L I P / F I . O Pr , I I H c t E A R
IC:TTL TP HEX INVERTFR
I C : T T I H F X D - T Y P EF L I P / F t o P T I T H c L F A R

28480
ol 295
12040
01295

I 8l 8-209 I
sN3543 I
Dil74L04N
sN3543I

c
I
2
3
4

t
I
?

I
2

I

I

t
I

NPNI SEIECTED FRolt .Ztil37o4l
NPNISEI-ECIED FRot a{3ZO4t

COIIP
CO'IP
COXP
COIiIP
COilP

I0t l/4r
x lox (}rr 57 tllU
Lt41

2 2 K o t r l o t L l4U
l2K OHI lot ll4\l
loo0 DHfi l0l
8200 olst lot
looo olH lol

50
50

TA 30 TV
r ..j]o tav

EXTRACTOR:PC 8NARD. ORANGF
SOC|(ET:lC
24 CONfiCT

See introduction

28 COillml
16-PlN
l4-Pll{

COI'P 12K

COIIP
COIIP
COl,lP
CO'IP
COiP

lOK
IOK
IOK
IOK
IOX

OuAt-Il{LINE

OHil lol

'rt||l
OHll
Ollll
OHll
tltl{

lol
tot
lot
10:
loi

TypF

l.r{}l

to this section for ordering

?ztl
l23l
lo2l
8221
lo2l

I O3l
1031
I O3l
l03t
I 031

information

6-23

Model 3490A

Section VI

T q b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Mfr
Code

Mfr PartNumber

OUTGT'ARO
DAIA ASSY

2Aaao

oa49(F66533

56289
72942
72942

co67 Blo2Elo2zs26-cDH
8 0 1 - x 8 0 0 0 1L
80 l-(8000 ll

Reference HP PartNumbet oty
Designation

Description

^3t

oa4.to-66534

a33Cl
^13C2
^?tc,

01 50-0 05 0
ol 50-o093
ol 50-oo93

csFlD cER looo PF +a(F20f looovDct.
C:FXO CFR O.Ol UF +80-2Ot lOoVOCt{
c:FxD cFR O-Ol UF .a(F20t loovocl

4 3 3 C 8I

1 9 0 2 - 3 0 30

Dloo€

28480

1902-3030

1 3 3 L PI
tlatlP 2
a33r{P3

0403-ol 86
t200-o43 r
120(F0473

EXTRACTOR:PC EOAR{L VIOL€I
SOCKET:IC 24 CONTICT
5tr,K€T: I C I6_PIN

284 80
2a480
28+aO

0403-olE6
1200-ot3 I
1200-ot?3

284aO

1200-ot?4

oll2l
0lt2l

ca +721
cb 2721

I

aFEAKOOTN:3.OlY

5t

400

^)IAP4

I200-o4?4

SOCKFT: IC

r33RI
433R2

o6a4-472 L
o6a4-27 2l

R:FXO CoHP 47OO Ollr't lot
R:FXD C0f{P 2700 oHt lO!

A33UI
^31U2
433U3
a33tr4
433U5

la2 0-0640
LA20-O627
la20-062 7
t8 20-o 596
Ia20-0596

IC: TT L
If.:TTL
IC:TTL
IC;TTL
IC:fTI

OATA 5EL€C TOfi,/I'IULIIPLEXER
f P BCO TO tEC. DECOof,R
t,P 8CD TO D€C. DECOD€R
LP DTIAL EOG€ TRIG.
D f/F
LP DT'AL EOGE TT,IG. D F/F

01295
o7 26?
07261
1 2 04 0
l2 040

sN?4150N
u7893L0t 59X
U?893LOI59I
Dl{?4L7{N
Dt'{74L7+N

133U6
Ä3:tu7
Ä33U8
A33U9
l33Ul 0

1820-o 596
LA20-O59l
1 62 0 - o 8 3 9
ta20-o83 9
ta 20-o 5a3

IC:TTL
lC:Trt
IC:TTL
IC:TIL
IC:TTL

IP DIIAL EDG€ TRIG. D F/F
LP 4l t-2-2-3
INPT.Ar|O Ofl, GATE
OIIAO D-IYP€ F/F
OUAO TFTYPE F/F
I.P OUAD 2-INPT IIAiIO GATE

1 2 04 0
l2 040
o 12 9 5
ol ?95
1204{)

of,r74l-74N
Dfl7{t5{N
sr{74t75N
sil?4l7ttl
Dn?rLoox

A 3 3 UI I
Ä3tu12
a33Ul 3
t33Ul 4

1820-ol 74
l8 20-062 I
la20-o59 I
l8 20-o 596

IC:TTL
IC:TTL
fC:TTL
IC:TTL

HEX INVERTER
OUAD 2-INPI
NANO ßIJFFER I/OPEN C
Lp 4u a-2-2-a
ltlPT.AriD OR G^TE
IP DTIAL€OG€ TRIG. O F/F

olz 95
01295
12040
12040

sta7404N
sN743ar
ol{TaLttN
Df{?tLTalt

^34

03490-66534

28480

03490-66534

729A2

aol-(aoo0 I I

2A4AO

1902-3t90

2a480
28480
28480
28480
28480

4040-0748
4040-o?47
12()0-ot69
1200-ot73
t200-ot74

otl2l
ol l2r
oll2l
28480
0l l2r

ca 222L
ca 3321
cB 1531
l8 lo-oo55
ca l83l

3

I

l4-Pll{
l/41
t/41

INGUARD ROII ASSY

':
l34Cl

ol 50-0093

c:Fxo

cEf{ o.o.L_uF

r 3 4 C RI

I902-3 190

DIOD€

ERF|KOOIiN:l3.OV

+8(F2ol
5:

toovDc|.
f{l

400

i

l3{tP I
^344P 2
A3+tP3
^t4AP4
A:I4FP 5

4040-o748
4040-o747
l2 00-0469
L200-o473
1200-0474

EXIRACTOR:PC .OARO. .LACK
€XIRACTOR:PC BOIRO. GRAY
SMKFT:IC
2A COilTTCT DUAL-INLI}IE
socKET: tc 16-PtN
SmKEI: IC l4-PIta

A:t4RI
^14e2
134R3
134R4
A:t4R5

o6a4-222L
0684-3 32 I
0684- I 53 I
l8 I O-0O55
0684-1831

R:FXD CO||P 220C OHfa l.O2 lt.t
R:FXO COIP 3300 otr{ lot
l/4r
RIFXD COxP r5(
OHtt lot
l/4r
RESISTIVE N€f}tORK:6 ILI
IO(
R:FXD COIiP l8r
ülX lot
l/41

434ß6
434R7
434R8
A3{R9
aSaa I c

06 84-l 83 I
0684-I 03 I
0684-l03 I
0 6 84 - l O 3 I
06a4-l 03l

R : F X D C O X Pl 8 K
R:FXD COXPIOK
R : F X D C O r , r PI O K
R : F X O C O H Pl O | (
R : F X D C O , { PI O X

OHtl lot
(}tt 10t
OHr(10t
OHt lot
OHt{ lO3

Lf4Y
ll 4r
I t4l
It4u
l r4Y

0l r2l
oll2l
oll2l
oll2l
or l2l

c8
c8
c8
CB
c8

I 831
I 031
1031
I O3l
lo:rl

A34FI I
a3{R I 2
af4Rl 3
A:]4Rl4
t3{Rl 5

()6a4-la3 I
o6a4-l 03 I
06 8+-lot I
0684- I 03 I
0684-I8 I I

R:FXO COIIP l8X
R:FXD COIP 10(
R:FXD COIIPlox
R:FX0 COIIPlo(
R:FXD COXP l8K

OHt lO:
0Hli l0l
OHlt l0l
OHt. lot
Ofrt 10t

l/4ta
I/4L
l/4x
l/4r
l/4I

0lt2t
ol r2l
oll2l
otl2l
olt2l

ca
CB
c8
c6
c8

I 8rl
l03l
I 03l
l03l
I Itl

A]{Rl6
l34R I 7
A:LRl I
r3aRl s
r34R20

06a4-l 03 I
06a+-1831
0684-t O3I
{J684- I O3l
0684- I O:lI

R : F X D C O | { Pr O K
R:FXO COXP l8K
R:FXD COi{Plor
R:FXO COriPIOK
R : F X O C O X Pl O ( '

OHt
t)}ilt
OH||
OHt
OHr

lot
lot
LOt
lot
lot

l/41
l/al{
l/41
l/(r
l/tr

ol l2l.
ol l2l
otl2l
ol Izl
oll2l

c8
c8
ca
c8
ca

loSl
l83l
l03 I
I03t
10 3 1

^:'4F21
^tae22
^*a2z
a*e21

0684-18f1
o6a{-l 83 I
06a4-t83 I
068a- I 01 I

R:FXD CO,{P l8K
R . : F X DC o x P l 8 R
R:FXO CO'|P l8K
R:FXO COrP IOK

ot{t{
OHI
(ttl
OHt

tota
lol
LOt
tot

tl4l
l/41
Ll4l
l/4t

o1121
0 1t 2 l
otl2l
ol l2l

CB
CB
c8
c8

I 831
l83l
l83t
I 03l

8

See introduction

:-21

TYPE

OHII 5I

to this section for ordering

information

Model 34904

Section VI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Reference HPPartNumbet
Designation

t8 20 -o 596
LA20-0777
1 . 8t 8 - 2 0 9 6
la20-062 0

434U3
A'4U+
I A)4ü5
434U6

j

Mfr
Code

Mfr PartNumber

12040
2A4AO
2S4AO
01295

Dil74L74N
1820-0777
I 818-2096
sN74l53N

01295
l2 040
ol 295
0 47 1 3

sN74L53N
Dt{74L74t{
sN3543l
sN7402N

CABLE ASSY
ASC$ ISOLATION ASSY:INCLUDES A30, A35, AND U1-U1 1
TSTR:PHOTO
INGTJARDISOLATION sOARD ASSY
ASCII

2A4AO
28480
28,180
24480

0349(F6l619
@490-60313
1990-0402
03490-66535

729 A728480
28480

801- K8000ll
1200-0471
1200-o{?4

FRot 2il37041
FROI{ 2fi3?O4l
FROtit 2N37O4l
FROr,t r{37041
FROil 2N3704l

2A4AO
28480
28480
28480
24480

1854-OO7l
I 854-00?l
1854-OO?I
I 854-OO7l
I 854-OO7I

otv

I
2

Description

IC:TTL LP OI,AL EOGF TRIG, O F/F
IC:TTL
LOI. POIER 8CD TO OECODER
R{}{: N-CHANNFI
IC:TTL
III.,LIIPLEXER
DUAL 4-INPI
DtlAl- 4-I lrlPT i,ltLT t pL EXER
IP DUAL FOGE TRIG. D F/F
HEX D-TYPE FI,IPlFI.oP
TITH
OUAO 2-INPT NOR GATE

^34U7
A34U8
434U9
A 3 4 UI O

la20-o620
I 820-O596
t8 20-o 7aa
LA20-032 A

A 3 4 YI
430/435
1
A30/A35U1.1
a15

03490-61 6l 9
ß490-60313
1990-0402
03490-6653 5

a 3 5 CI
a35fPI
At5t1P2

0r 50-oo9 l
1200-0473
1200-o47 4

C:FXo CER 0.Ol
UF +8G-20t
SOCKEI: TC I6-PIN
SOC|(ET: IC 14-PlN

rt50t
4t502
13501
^3504
43505

l8 54-007 t
1854-007I
I 8 5 4 - O 0 7I
la54-oo7 I
I 854-O07 I

TSTR:Sl
TSTR:Sl
TSrR:Sl
TSIR:Sl
TSTR:Sl

a35RL.
a?5e2
435R3
^35R4

0684-1521
0684-152 1
ffi8't-1521
0684-1521

r35R5
a3tß6
A3'R7
A39RA
135R9

0684- 1521
o6a4-4721
0684-6a2 t
o6a4-682I
06a4-682 I

a35RlC
a35Rl t
A 1 5 R l2
t35Rt 3
a35Rl4

o684-6a2 I
06a4-682 I
clj84-221'l
A
06,8r',-2211 ,A
068r',-2211 l$

A 3 5 R l5
l35R I 6
l35Rl 7

@€r'.-221r
06,8/-2211
0684- 1521

A35Ur
^t5u2
^35U3
135U4

1 82 0 - O1 7 4
l8 20-o876
1820-058ö
l8 20-O 513

l35Ul

0349(F616I

436

0349(F 66536

a36C I

^36t{P I
^16ttP 2
a36rP3
a36rP4

qeJs :c g4kcair€

Se

I C: TTf
IC:TII
IC:TTIIC:TIL

2

Ä.
I

NPNIS€LECTEO
NPNIS€LECIED
NPt{l SELECTED
NPN(S€LF.Cf€D
NPNIS€l-FCTFD

CLEAR

lOoVDCI

A
A,
A

R:FXD
R:FXD
R:FXD
R:FXD

10% 1/4W
1 0 %l / 4 W
1 0 %1 / 4 W
1 0 %l / 4 W

01121
01121
o1121
01121

1521
1521
CB 1521
CB 1521

A

R:FXO COMP 1500 oHM 10% 1/4!t/
R:FXD Ctll.rP47OO Olfl 10t l/41
R:FXO COI|P 5.aX OHt,l lot l/4t
R : F X O C O I 4 P6 . a x O H H 1 0 ! l / 4 r
RIFXO COI{P 6.8K O}01 IOZ ltr*a

01121
otl21
otl2l
0lt2l
olt2l

CB 1521
CB 1721
c8 6821
cs 6 A 2 t
c 8 6A2l

R : F X D C O f t P6 . 8 K O l t t l o t l / 4 r
R:FXD CO|P 6.8X OHH t1t |ttü
RIFXD COMP220 oHM 10961/4W
R:FXD COMP220 oHM 10961/4W
R:FXD COMP220 oHM 10961/4W

olt2l
oll2l
01121
01121
01121

c a 6A2 I
c8 6821

R:FXD
R:FXO
R:FXD

01121
01121
01121

.A

IC:TTL HEX:INVEI,TER
IC:DIGtT^L."t]9 ottaD 4:8tr.
TTL
IC:TfL LP HEX INVERTER
l c r r T L O U A Dz - I N P T Ä i D c A T E t O e E i l C o t - L t

ol.295
o1295
l2 040
ot295

SN 74 O/oN
sN74L 75N
DftTtL04N
sN?409N

caELE lsst

28480

0349(F6

INGUARD PROGRAI,,IASSY

2E4 80

03490-66t36

0 I 50-009 ?

clFxD cER O.Ol t'F +8(F201 loovocl

72942

801-K8000tt

4140-o74 I
{o40-0? 55
1200-o+31
r200-o6? 3

E X T R A C T O R : P8
C0 A R O , E L A C K
E X T R A C T O R : PE
CO A R D TV I O L € I
SmKFT: IC 24 CONTICT
S O C K € f :l C l 6 - P I N

28480
24480
28480
24480

4040-o?48
4040-o?55
1200-043 I
1200-0471

Vil l

A

A

4

I
I

9

I

See introduction

COMP 1500 OHM
C O M P1 5 @ O H M
C O M P1 5 m O H M
C O M P1 5 m O H M

C O M P2 2 0 o H M 1 & 1 / 4 W
COMP220 oHM 10961/4W
c o M P l s m O H M l @ t D1 l 4 W

.A

2211
2211
2211

2211
2211

CB 1521

t6l9

to this section for ordering information
6-25

Model 3490A

Section YI

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Reference HP Part Numbel
Designation

otv

Description

Mfr
Code

Mfr Part Number

lzoo-o47+

^?6r{P.-

t200-o474

S O C X E Tl :C l 4 - P l N

28480

Ä3601

1854-O07l

TSTR:SI NPNISELECTEF
OR o r . ä { 3 ? 0 4 1

2a4AO

r854-OO?l

l36Rl

o6a4-4701

R : F X D C O | { P4 7 o H t l o t

ol l2l

cB 4701

436R2
436R3
436R4
A36UI
At6U2

06 84-l Al I
0684- I O3I
o6a4- I 03 I
l8 20-o600
t 8 20 - o 7 7 7

R:FXD COttP180 oHx lot l./4r
R:FXO COtlP loK OHfl lO! l/4r
R : F X D C O S PI O K O H ä l o l l / 4 1
I C : T T I L P O E C A D €C O U N ' € R
IC:TTL LO|, POIIER 8CD TO DECOO€R

ol 121
oll2l
ol l2l
lao40
2A480

c8 l.8ll
c8 Lo3l
ca 1031
Dfr85L90||
ta20-of7.7

t36U3
A36U'
A36U'
436U6
436U7

1820-o5l I
I 820-O83 9
t820-or?4
1820-o656
La20-o640

IC:TTI.
IC:TTL
IC:TTL
IC:TTL
IC: fTL

O U A O2 - I N P T A I D G A T E
O U A DD - T Y P E F / F
HEX INVERTER
LP 4-8IT 2-INPT |IULTIPLEXER
D A T A S E L E C T O R / I U I . T I PEt X E R

01295
0t295
ot295
ot 295
ot295

sN74oAN
slr?41751{
slt7404r{
sN74L9aN
sfl74150N

Ä36U4
436U9
a36Ul I
^36Ut2

t82 0-o656
1820-o596
la20-o596
1820-0596

IC:TTL
IC:TTI
IC:TTI
IC:TTL

LP
IP
LP
LP

ot29t
12040
12040
12040

sN74L9Ail
DX74L74N
Dfr74L?4r.1
Dfrt+L74N

A37

11118-66502

SAMPLE/HOLDTRIGGERGATEASSY

2&AO

A37MP1
A37MP2

4040-0748
4040-0755

EXTRACTOR:PC BOARD BLACK
EXTRACTOR:PC BOARD V10

28480
28480

(wJ47ß
4040-0755

A37U1

1820-0583

lC: TTL LP OUAD 2-INPUT NANDGATE

t20/o

DMT4LOON

I

See introduction

a-24

l/4ta

4-BIT 2.IT{PT I{UI,TIPLEXER
O U A L E D G FT R I G . O F / F
I X , A I -E O G € T R I G , D F / F
D U A I ,E D G € T R , I G . D F / F

to this section for ordering

information

'|

1118-66502

Section VI

Model 34904

T o b l e 6 - 1 . R e p l o c e q b l eP o r t s ( C o n t ' d )

Reference HP PartNumber
Designation

oty

Description

CHASSIS

Mfr
Code

Mfr PartNumber

6 IIISCELLANECI'S PIRTS

AI
A2
A3
A4
A'

034S(F66501
03490-66 502
0349 0-66503
01490-66504
o349 0-66 505

I.iAIM CIRCUIT ENARD ÄSSY
HIGH I'.IPEOANCEASSY
BOARD ASSY:OISPLAY
BOARD ASSY;REI{II€
JT'T|PER
AOARO ASSY:RÄIGF s|ITCH

28480
28480
28480
28{80
28480

0349{F66501
o3190-665o.2
ot490-665oiJ
('3490-6650+
0349(F66505

A6
l?
AA
A9
^lo

o349{F66506
03490-6650?
03490-6650a
03490-66509
o3490-665t O

BNARD ASSY:COIIIY€RTERAC
BOARD ASSY:OHI{ COTWERTER
OUTGUAROPOIER SUPPLY EOARD ASSY
I'{;UARD
DATA d'TPUT
BOARO ASSY
OUTGUARODATA OUTPI'T BOARD ASSY

284 80
28480
284E0
28480
2A480

03490-66506
03490-66507
03+9G-66508
03a9(F6650!)
0349(F665lO

all
^t2
al3
at4
al5

03490-6651 I
03490-66 5l 2
0349(F66 513

INGUARD REf{OIE ASSY
UUTGI.,ARO REAI]TE SOARD ASSY
R A T I O R . E F E R E N C EB O A R D A S S Y
NOT ASSIGNED
DATA O,'|TR'T ISOI.ATION SOARD ASSY

2a480
28480
284aO

03490-665 ll
0349r66512
03490-66513

28480

0349(F603(}6

za4ao

0349160t08

Ä16
al7
al8
al9
^20
A2l
^22
^21
A21
^25

01490-603 06

NOT ASSIGNEO
REMOTF ISOTATION
NOT ASSI GNED
NOT ASSIGN€D
NOT ASSIGNED

of490-6030a

EOARD ISSY

28480

0349(F60a02

ot490-66524
0349(F66525

NOT ASSIGNED
SYSIEII ISOLATIOI
ENARD ASSY
N(JT ASS IGNEf)
S/H ANALOG JI'I'P€R ASSY
S/H LOGIC JUHPFR ASSY

24480
28480

o34e(F6652t
0349(F66525

A26
A27
^24
429
430

Oat 9O-6652 6
oSt.9o-(a527
or490-665? A
ll I l8-66501
03490- 66530

AATIO JUI.IPFR ASSY
SAIlPI.E/HOLD ANALOG BOARO ASSY
SAI4PL€/HOLD Lff;IC BOARD ASSY
OI'TGUARD TRI6G€R ASSY
ASCIL OUIGUARD ISOI-ATION ASSY

28480
284 80
284 EO
28440
2A480

0349(F66526
03{9(F6652?
0349(F66528
I I ll 8-66501
oa49(F66530

a3l
432
a)
a3r
435
436
A37
cl
c2
cRl
FI

0349(F66531
0749(}-66532
03490-66533
03490-66534
03490-6653 5
03490-66536
111t8-66502
ol 60-r33 3
ol 60-333 3
t90 2-t2J2
2l lo-o3t2

NUTGUARD I.IOIIIER BOARD ASSY
OUTGUARD ROT ASSY
OUIGUARD DATA ASSY
II'IGUARD ROr ASSY
ASCIL INA'ARD ISOLATION OOAID ÄSSY
INGUARD PROGRAM ASSY
SAMPLE/HOLD TRIGGER GATE ASSY
c:FxD cER 5000 PF 20t 250I,YAC
C:FXO CER 5OOO PF 20: 25ory C
DlOa)€ BREAXDOBI:5.6V
tol
445 ta^
F1AE:CARTRIDGE I ltip 250V g-Or-8LOl

28+80
24t80
26460
28480
2a+ao
28480
28/l80
28t80
2atao
8013t
Tlioo

0349r66531
ot19t665t2
03t9(F66533
03190-665:ra
o:!190-66535
03490-66536
11118-66502
ol6(F3333
ol60-3333
llr:r99?R
IDI_-I

F2
JI
J2
J3
J4

2tto-o202
I 5 I O-OOA5
l5 I O-OOA5
l5 I O-OOa6
15 lo-oo8 5

I

FtrsE:o.5oA
?50v SLot-BLOr
BINDTa{G Pot},assy.
_-EINOI'S
POST ASSY

t

EIlrDtrs PosTa
. ssY

75915
2A4aO
28480
28480
2S4AO

3l 3. 500s
I5 lO-OOa5
l5l(Foo85
l5l{Foo16
I 5 tO-OOA5

J5
J6
J?
Jlo
Jll

I 5 I O - 0 0 85
l2 5l-o087
125t-O085
t25 l-l ?12
l25l -o143

I
I
I
I

BTiIDING POST ASSY
CONNFCTOR:FEIIAL€ 5O-PIN I{INAT
CONNECTOR:F€IiIE
36-PIX
XINAT
CONII:IIALE 4 PIN SPI. RJRPOSE
CoNNECTOR:F€HILE.
lt-g)atTlcT
J Cr(

284r0
2a+ao
2A480
28480
28480

I 5 IO-OO85
l25l-008?
t 2tl-o065
L25t-t2r2
l25l-o 143

J12
fiPl
ilPIA
XP IB
riPlC

L25l-a283
4040-0914
03490-043{) I
03490-04302
03{9(F04303

I
I
I
I
I

CONNECTOR:24-PI N
PANEL: FRON'
DECAL :FROilT PAilEL (SIAI{OARD)
D€CAI.:FRONI PANEI- S/H
O€CAL:FRTI}IT PAII€T RATIO

2g4AO
284aO
2E4AO
28480
28480

l25l-32a3
{o40-o9l{
03+90-o1301
o3a9(FOt!t02
0349(FO+t03

I,IPID
tP2
tP:l
üP4
,4P5

0349(F04304
4l I4-O717
0349(F04lO2
o!490-04402
0349(F28301

I
I
I
I

DECAI:FRONT PANEL. R.AIIO./S,'H
HIIooH: DISPLAY
GUARH OVER-AOTTOI{
C(|vER : BOTTOI
TRIII: BOTTOX

28480
28480
28480
28{80
2448(}

0349(FO430a
4lt4{71?
0349(FO{.102
03490-o+a02
ot49(F2At0l

t1P6
,4Pl
tPa
raP9
xPlo

03490-22001
03490-2370 r
03490-60312
()3490-OO60t
03490-60 40 I

I
I
I
I
I

FRAIIF:SIDE
EXTFNDER ROO ST'IICH
PANEI- ASSY:REÄR
SHIELD: POI€R IiIPUT

cx^ssIs assY

28480
28480
28{8d
2A480
28480

0t490-22001
03{9(F23701
ot49(F60312
03+9F0060l
0:1a90-60tol

,IPI I
TPI2
rPI3
iP l4
xPl 5

0349 0-O4 lO I
o1490-04401
03{90-2 I lO I
o3+o-o?6 2
40{o-o92 I

I
I
I
I
I

GUARTHOVER-TOP
C OVER,:TOP
HEAT SINKsTRAilSISTOR
I nsul AroR,:TRAti6 I SrOR
T RI T: TOP

28480
284aO
28480
24480
28t80

o3r9FO+lOl
0349rOaaol
o3{90-2 I lOl
o340-o782
+oto-o921

o1490-60 302

2
I
I

BINDTT{G POSI

See introduction

SSI'

to this section for ordering

information

6-27

Seetion VI

Model 3490A

T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d )

Reference HP PartNumber
Designation

otv

Description

Mfr
Code

Mfr PartNumber

2A{80
28480
20480
28480
28480

5000-8593
5000-o050
03t9(F26302
5060-0767
1490-o030

fiPl6
tlPl z
f i Pl A A
f,rPl8
r{Pl9

500 0-8 593
5000-oo50
o3490-28 302
5060-o767
1 4 9 0 - O 0 30

I
I
I
I
I

COV€R:SIDE 3 X l6tot-tVE
TRII{:SIDES
F OOT: CF'{TER
For|T ASSY:F{
S T A N D : TI L T

ilP20
AP2I

03 70-09 29
o3fo-2 | | 2

I
I

KMlA:LFV€RTJADE 6RAYIALc I
Xt{fIB:ONE-fiALF
POINIER

2844O
2A4AO

0370-o929
ot70-2tt2

t1P2.3
AP24
MP25
MP26
MP27
ÄP2A
Ae29
r{P30

otlo-224a
o!70-?_767
0510-1 165
9320-1646
9320-1647
o740-o72 4
ot40-o4a I
0360- t7 5A

I
I
I
1
1
I
I
I

K NoA: ON/OFF
KMTB: PI'SHBUTTON üAilUAL
RING: RETAINER
CARD: OPERATING, 60 HZ.
CARD: OPERATING, 50 HZ
r ISUTATOR:EINOING POSI
I NSI'L ATOR
NUT: TERITINAT

28480
2A4AO
00000
2A4gJ
28r',a0
28{ 80
ooooo
ooooo

o370-22/t8
0370-2t67
OBD
9320-1 646
9320-1647
ot+o-o724
OBD
{]80

fip3l
AP12
AP33
te34
tt?35

03490-84 40 I
0349 0-90 0t 3
5060-0630
5060-59A 3
o:t490-o4 lI 8

I
I
I
I

KIT:RACK XOI,NT
'1ANt'AL
AOARD:€XTENDER 22 PIN {2X221
PC ASSY: EXTENDER 18 PIN (2X.I8)
PLATE

2a+80
28 440
2a480
2A4SO
2A4AA

ot+9(F8'1401
(849(F90013
5060-0630
5060-5943
0349(F041l8

tP36
AP17
r{P38
iP39
tP40
MP41
MP42
MP4i}
MP44
P1
P6
P7
P10
P11
o1
R1
sl

4040-o9l 6
0 37 0 - 0 9 l 4
03 70- I 099
0370-l 099
5060-603 2
03490-64101
o340-o744
03461-24701
03490-012m
1251-2357
1251-0086
1251-0084
1251-1233
1251-O142
r854-0063
oal1-2771
3101-1720
3'r01-1609
3 loo- 3078

LEV€R:FUISTTON SIITCH
AEZEL:PUSHEUTTON KIIOEI JADF

28480
2a480
28a80
28{ 80
20480
28480
28{'AO
28r'.ffi
28480
823@
2A4AO
28/,80
28.180
28/,eo
80131
28480
2AßO
82389
28 480

4040-o916
03?o-o9la
03?o-1o99
o3 70-l 099
5060-6032
03490-64101
0340-7044
ß461-24101
03490-01208
EAC-301
r251-@86
1251-0084
1251-1233
1251-0142
2N3055
@11-2771
3101-1720
11E-1036
3 I OO-3078

2A480
28480
244.80

3t oG-3076
3l oo-2 735
3 lo0-2734

42t90
284a0
70903
28480
28480
28,|80
75263
28480

I 1238
9loo-328 t
xH s-70r I
03490-61 610
03490-61612
03490-6161
3
3420M
.1601
03490-80009

28480
28480
28480
2AßO
28480
24480

9211-16a2
9220-206.7
03490-@313
03490-66532
03490-66533
03490-66534

s2
s3
s4
s5
s6
s7
sa
TI
tl
t2
w3
w4
XFl

xo1

1
I
2
I
I

4
1
1
1
I
I
1
I
I
1
1
1

3t oo-fo ?6
?LOO-27t5
3too-2774

I
I
I

3 lo 1-oo 45
9l oo-328 L
I I 20-l 348
o 3 4 e o - 6 1 61 0
03490-61612
03490-61613
14m-0085
1200-0479
03490-80009

I
I
I
I

9211-1682
9220-20ß'7
03490-60313
03490-66532
03490-66533
03490-66534

I
1
1
1
1
I

,|

I
I
1
I

03490-66536
03490-80013
1540-0249
1420-0174
1820-0513
1820-0586
r820-0590
1820-0621
1820-0erc
18m-0710
18m-0876
1854-0071

I

,|
I
1
1
I
1

1990-4402
8490-80031

1

154t!-0248
I 820-0 174
r82G-O430
1820-0586
1820-0621

i
I
1
I
I

GRAYI

TRIG6FN,

JADE

GREY
KI{IO: JAOE GRAY
KM}8!JADEGRAY
PC EOAROEXIC['{)ER
C O V E RR
: E A RT E R M I N A L
INSULATOR:SUPPORT
SUPPORT:
ElNDlNGPOST
E R A C K E TF: R O N TT E R M I N A L
SOCKET:3-PtN MALE POWERReCepfnCli
CONNECTOR:50CONTACTR & P
PLUG:36-CONTACTMALE WHOOD & CLAMP
CONNECTOG
B :U A R D E DC A B L EP L U G
CONNECTOR:
MALE 14 CONTACTS
TSTR:SI NPN
R: FXD WW 0.18 OHM 3% 3W
SWITCH:PUSHBUTTON
DPDT STNGLE
STATTON
SWITCH:SLIDE 2-DPDT
s tl rcH: FUNCTl(},l
SEE A'.
SI,I TCH:ROTARY
SIITCH:ROTARY
SP I T C H : T A TI O
-i
srITcH:sLtD€ opor o.i tti
tz: voc
f RAr{sFORf.FR
C A B L E A S S Y : P O F E R ,D E T Ä C H A E L f
CAsL€ ASSY:AC
C A B L E : R E A IRN P U T
CABLEASSY
F U S E H O LEDR
SOCKET:TSTR.
NYLON INSULATOR
A S C I IR E P A I RK I T
INCLUDES:
C A R T O N : S E LLFO C K I N G
B O XL I N E R
ISOLATIONBOARDASSY
OUTGUAROROMASSY
OUTGUARODATA ASSY
INGUARDROMASSY
INGUARD
PROGRAM
ASSY

28,180

03490-66536

PARTSKIT FOR ISOLATIONASSY
C O N S I S T I NOGF :
PLASTICBOX
I C : T T LH E X I N V E R T E R
l C : DI G I T A L
lC:DIGITAL
I C : T T LL PD U A L

28€0

03490-80013

2A4AO
01295
01295
120/.O
12MO

1540-0249
sN7404N
sN7409N
DM74L04N
DM74L51
N

lC:TTLOUAD
lC:DIGITAL
l C : D l GI T A L
lC:DIGITAL
TSTR:SINPN

01295
01295
07263
01295
28480

sN7438N
sN23623
sL1735
1
sN21957
'1854-0071

TSTR:PHOTO

244€0

1990-0402

P A R T SK I T F O RO U T G U A F D
MOTHER
B O A R DC O N S I S T I NOGF :
PLASTICBOX
l C : T T LH E X
lC;LINEAR
I C : T T LL PH E X I N V E R T E R
lC:TTLOUAD

28480

03490-80031

24480
01295
28480
12040
01295

1540-0248
sN7404N
1820-0430
DM74L04N
sN7438N

See introduction

to this section for ordering

information

I

Model 34904

Section VI

T o b l e 6 - l . R e p l o c e o b l eP o r t s l C o n t ' d l

Reference
Part Number
Designation HP

otv

Description

Mfr
Code

Mfr Part Number

1901-0363

D I OA S S Y : S l

28480

1901-0363

03490-80032

PARTSKIT FOR OUTGUARDROMASSY
C O N S I S T I NO
GF :
PLASTICBOX
MOSN CHAN ROM
MOSN CHAN ROM
l C :D l GI T A L
I C ; T T LL P H E X T N V E R T E R

28480

03490-80032

24480
28ßO
2a4AO
o4713
1204;0

1540-O24A
r8 18-2097
1818-2098
sc l3241PK
DM74L04N

l C : D l GI T A L

0't295

sN35431

PARTSKIT FOR OUTGUARDDATA ASSY
C O N S I S T I NO
GF :
PLASTICBOX
I C : T T LH E X I N V E R T E R
l C : T T LL PO U A D
IC:TTLLP
lC:DIGITAL

28480

03490-80033

28la0
01295
12040
1z0/.O
120/.O

1540-024e
sN7404N
DMT4LOON
DM74L54N
DM74L74N

lC:TTLOUAD
IC:TTLLP
lC:DIGITAL
lC:DIGITAL
DIO:BKDN
3 . 0 1V

01295
07263
28480
01295
28ß0

SN7438N
u7B93LOr59X
1820-0640
sN35872
1902-3030

P A R T SK I T . F O RI N G U A R DR O MA S S Y
C O N S I S T I NOGF :
PLASTICBOX
MOSN CHAN ROM
lC:TTLOUAD
lC:DlclTAL
lC:TTLDUAL

28480

03490-80034

24480
2AßO
0r'.713
12MO
01295

1540-O24A
1818-2096
sN7402N
DM74L74N
sN74l53N

1540-O248
1814-2097
1818-2098
1820-0567
1820-0586

1
1
I
I
1

1820-0788
03490-80033

1

1540-0248
1820-0174
1820-0583
1820-0591
1820-0596

1
I
1

1420-0621
1420-0627
1820-0640
1820-0839
r902-3030

4
'I
1
I

03490-8@34
't540-0248
1818-2096
1820-0328
1820-0596
1820-0620

1
I

1420-0771
1820-0788
1902-3r90

1
1
I

lC:OIGITAL
lC:DIGITAL
TTL HEX
D I O : B K D N1 3 V

28480
01295
28480

1420-0777
sN35431
1902-3190

03490-80036

I

03490-80036

I
1
I
I

P A R T SK I T F O RI N G U A R DP R O G R A M
ASSY
C O N S I S T I NOGF :
PLASTICBOX
I C : T T LH E X I N V E R T E R
lC:TTLOUAD
lC;DIGITAL
lC:TTL LP

2848'0

1540-0248
1820-0174
1820-0511
1820-0596
1820-0600

2A4aO
01295
01295
12040
1204.0

154O-O248
sN7404N
SNT4OBN
DM74L74N
DM85L90N

1820-0640
1820-0656
1Am-O177
1820-0839

1
2
1
1

lC:DIGITAL
IC;TTLLP
lC:DIGITAL
lC:DIGITAL

28480
01295
2AßO
0t295

1820-0640
sN74L98N
1e20-o177
sN35872

6-29

Model3490A

SectionVI

h

N

MP7

MP37
MP23

Designator
MPl
MPlA
M P 1B
MPlC
M P 1D
MP2
MP3
MP4
MP5
MP6
MP7
MP8
MPl O
MPl 1
MPl 2
MPl5
MPl 6
MPl7
MP18
MPl8A
MP19
MP21
MP23
MP24
MP37
MP38
MP39
MP41
MP42
Item
1

2
3
4
o
7
8
a

10
t l

Description
Panel: front
Decal: front panel {standardl
Decal: front panel (sample/holdl
Decal: front panel (ratio)
Decal: front panel {s/h and ratiol
Window: display
Guard cover: bottom
Cover: bottom
Trim: bottom
Frame: side (2 requiredl
Nut: sheet metal
Extender rod: on/off switch
Panel Assy: rear; includes ac power connector P1 and switch 52
ChassisAssy
t^..
Guard cover: top
Cover: top
Trim: top
Cover: side (2 required)
Trim: side (2 requiredl
Foot Assy
Foot: center
Stand: tilt
Knob: 1/2 in. pointer
Knob: on/off switch
Knob: pushbutton, trigger
Bezel: on/off switch
Knob: jade gray
Knob: jade gray
Cover: rear terminal
Insulator: support
Machine Screws
Description
6-32 x 114 flat head
6-32 x 114 flat head
440 x 3/16 pan head
Lock Washer: helical
6-32 x 114 flat head
6-.32x 114 f lat head
6-32 x 5/1 6 flat head
8-t2 x5116 pan head
Lock washer: helical
8-32 x7116 pan head
Lock washer: helical
Flat washer
6 3.2 x 3116 flar head
10-32 x 3/8 flat head
6-32 x 5/1 6 flat head

Figure6-1. Chassis
Parts.
a--i,l

-hp-Part No.
40400914
0349044301
o349044302
0349004303
0349044304
41144717
o3/j9044102
03/9044402
o3490-28301
034,90-22001
0510€075
03490-23701
034906031 2
03490-60401
0349004101
0349044401
40404921
5000€593
5000{050
5060{767
03490-28302
1490{030
o370-2112
0370-2248
o370-2367
03700914
0370-1099
0370-1099
034909101
ouo4744
-hp-PartNo.
23704012
23704012
22004137
21900913
2370{012
2370{012
2360{194
2510{1 01
21904087
25100105
21904087
30504228
2360{190
2680{1 16
23604194

SectionVI

Model3490A

MP30
T E R M I N A LN U T
0360-1758

MP2g
INSULATOR
03400481
BTNDING
P O S TS U P P O R T
I
03461-27401
,

MP28
INSULATOR
03404724

\

BINDING POST
1 51 00085

l

\

L ;oo-@
\*o0

P\

/
/

t

mft @v&''

/

/

\'o,%#'o'.x'^
'*i*o'"'*

BRACKET:FRONTTERM
\

LOCKWASHER
2190{054
H E XN U T
2950{054

Figure6-2. BindingPostAssembly.
RANGE DRUM
4040{91 5

G E A RL E V E R
40400916
R E T A I N E RR I N G
0510{083
{2REOUIRED)

FUNCTIONSWITCHBRACKET
034,90-21202
D R U MB E A R I N G
o3r'r90-21201

F U N C T I O NL E V E RS H A F T
o3490-23703

RETAINER RING
o51 0-1 1 65

FUNCTIONSWITCH53
3100-3078

RANGE LEVERSHAFT
03490,_23702

RANGESWITCHLEVER
0370_21
98

R A N G ES W I T C H
BRACKET
03490{1 207

FUNCTION
SWITCH
GEAR
03490€3601

H E XN U T
318x32
29500043

LOCKWASHER
3/8 lN.
2190{01 6

Figure63. Switch Assembly.

6-31

Model3490A

SectionVII

S E C T I OV
NI I
TBOUBTESHOOTING
AND
C I R C U ID
TIAGRAMS
7 - 7 .A C C E SFS0 RS E R V t C t N G .

7 . T .I N T B O D U C T I O N .
7-2- This section contains information necessary for
repairing the Model 3490A. Schematicdiagrams,troubleshooting trees, and other troubleshooting and repair
information are included. Figure 7-17 showsthe location
of assemblies within the 34904. Additional troubleshootingnotes arelocatedon schematics.

7 . 3 .P B E L I M I N A T
RR
YO U B L E S H O O T I N G .
74. lf the Model 3490A operatesincorrectly and the
trouble cannot be correctedby the Adjustment Procedures,the following troubleshootinginformation should
be used. Check for loose wires or other obvioussources
of trouble, such as burned or loose components.Make
sureprinted circuit boardsare seatedfirmly in connectors.Also make sure those microcircuit packagesthat
mount in socketsare filmly seated.

7-6. Troubleshooting information for various circuits or
operationsof the 3490A is containedin severaltroubleshooting trees and associatedinformation. The General
TroubleshootingTree,Figure 7-4, may be usedto isolate
the problem to a particular areaof the instrument. The
following list indicates the circuits to which each tree
applies:

Standard3490A Circuits
General
DC Analog
AC Converter
Ohms Converter
Display
Logic Test
hgic Clock
Option 021
Data Output
Option 022
Remote
Option 030

cPrBr/o

Option040 or 045
Sample/Hold
General
Sample/HoldLogic
Option080
Ratio

The High Impedance, AC Converter and the
Ohms Converter printed circuit boards and
components must be kept clean and free
from fingerprints or other contamination, or
performance may be degraded.Handle these
assembliesby the board extractors.

7.9.POWER
SUPPLY
CHECKS.

7 - 5 .T R OU B L E S H O O TTI N
RG
EES.

Troubleshooting Tree Title

7-8. Access to most areas of the instrument may be
gained by removing the top cover and the top guard
cover; It should not be necessaryto remoyethe bottom
coversunlesscomponentson the Main Circuit Assembly,
Al , must be replaced. Removethe top trim strip to gain
accessto the Display Assembly.The three vertical screws
which secure the Display Assembly heat sink to the
guard shield must be removed in order to remove the
Dsplay Assembly.

Figure No.

14
n <

7-6
7.7
7-8
7-9
7-ro
7 -lr
7-12

7-10. Check the power supply voltages at the points
listed in Table 7-1 using an oscilloscopeand a dc digital
voltmeter with 4digit resolution. Voltage and ripple
specificationsare as shown. All ripple measurementsare
to be made with the samplerate in the HOLD position.
Voltages are listed following the supply used as its
reference.Therefore, power supply voltagesshould be
checked in this order. The first supply checked wtrich
fails to meet the voltage specified is the faulty supply.
All supplies referenced to the faulty supply will also
, indicate readings out of specification. With the faulty
supply identified proceedto troubleshootas follows:
a. Pull opticns and install requiredjumper boards.If
problem disappears,determine which option is at fault
and proceedto its troubleshootingsection.
Table7-1. PowerSupplyVoltagesand GurrentLimit Values.
BaseSupply
A1A,I
Test Point

Volrage

+ 1 7V
+ 5V
+30V
- 17V
- 5V
- 30v

Ripple

16.99 to + 17.0'l V
4.995 to + 5.075 V
30.10 to+3O.9OV
'16.9
to- 17.1 V
5.00 to - 5.85 V
30.10 ro-30.90 V

t-13

< 50 mV p-p
( 60 mV p-p
< 25 mV p-p
<50mVpf
< 60 mV p-p
< 25 mV p-p

Current Limit
{Applox. Voltag€sl
Al Rl04 = .434
= .448
A1R'l
'l
Al R11 = 1.34
A 1 R 1 1 8= . 5 4

V
V
v
V

4 1 R 1 2 5= 1 . 3 0 V

Raw S0pply

1-14
7-r5

Test Poinl

1-16

TPA
TPC

TPD

Supply

24V
24V
38V
38V
9V

Voltage

24to+28V
24to- 28V
38to+44V
38to- 44V
9to+11V

Ripple
{Approx. Voltag€)

I vp-p
t.2 v pf
.5VFp
.5 v p-p
1 . 5V p - p

1-l

Model3490A

SectionVII

b. If the problem is not with an option, determineif
the faulty supply is in current limit (seeParagraph7-12).
If so, determinewhere the short is by use of the power
supplyjumpers and troubleshootthat section.
c. If the faulty supply is not in cunent limit,
determineif the faulty supply has the correct raw supply
voltage (see Table 7-l). ß the raw supply doesnot meet
specification,troubleshootthis section.
d. If the faulty supply is not in current limit and the
raw supply is within specification, troubleshoot the
faulty supply.
7-11. lf the + 17 V supply is out of specificationand
cannot be adjusted per Paragraph5-54, troubleshoot
accordingto Paragraph7-10, steps a, b, c and d. It is
essentialthat the + 17 V supply be within specification
since all other supplies are referencedto this supply and
will be affected. If oscillation problemsare encountered
o n t h e + l 1 Y s u p p l y , c h a n g eA l C l O g t o 1 0 0 0 p F ,
400 pF or remove from circuit. If there are ripple
problems on the + 17 Y supply or any other supply,
check to assurethe line voltage selection switchesare set
to correspond with available line voltage. If ripple still
exists, replace the filter capacitor of faulty supply.
Ripple problems on the - 17 V supply can be causedby
ripple or low voltage of the - 30 V supply Qowervoltage
than the -24Y raw voltagesupply).
1-12. Nl power supply regulatorsare current limited so
that if an excessiveload is applied,the regulatorvoltage
output goes to neat zero. If this is suspectedto be the
problem, the supply in current limiting can be determined by measuringfor the current limit voltageacross
the resistor which are both specified in Table 7-1.
Provisionhas beenmade for isolatingcertain areasof tfue
Main Circuit Assembly by removing designatedjump6r
wires in order to locate the areawhereexcessive
loading
occurs.Table 7-2 lists the jumper wire designationsand
the circuits supplied through each. Thesejumpers are
located on the Main Circuit Assembly, Al and the
vertical board, AlAl. All of the Logic circuits are
supplied through only one jumper wire for eachvoltage.
Consequently,jumper wires are provided in the ground
circuits to isolated portions of the logic circuits. These
ground jumpers are shown on the schematicdiagrams,
Figure 7-23 andT-24.

TableT-2. PowerSupply Jumper Wires.
Voltag€

+17V
+17V
+17V

Circuits Supplied

Wire Location

WH
w2
W6

A1
A1A1
A1A1

Logic
t 10 V Reference
Integrator, Zero Detect

wl
WEE
W3

A1
AI
A1A1
AlAT

logic
DC Switching Level Translators
tl0 V Reference
Integrator, Zero Detect

wz

AI
A1
A1A1

Integrator, Zero Detect
DC Amplifier
t 10 V Reference

WFF

A1
A1
A1

Integrator, Zero Detect
DC Amplifier
DC Switching Level Translators.
A1CR403

+5
+5

WJ
W1

A1
A,'41

+5

W7

A1A1

Logic, Display, Switches
Al U4Ol , O\rerloadProtection,
DC Switching Logic
Integrator, Zero Detect

-5V
-5V

WG
W5

A1
AlA.I

Logic
Integrator, Zero Detect.

-17V
- 1 7V
- 1 7V
-17V
+30V
+30V
+30V
-30v
-30v
-30v

ua

WBB
W4
WAA

wcc

facilitate repair of your 3490A when the trouble is on
the A2 Assembly.Contact your nearest-hp- Salesand
ServiceOffice for details.

7-17.DCAmplifier
Checks.
7-18. To check the DC Amplifier zero, set the Function
switch to TEST and select Range 5. This grounds the
amplifier input and sets the amplifier gain to 100. The
front panel display should be 000.000 1 15 counts. To
check for leakagecurrent in the input circuits, compare
the numericalreadingin Test 5 to the readingin Test 6
with the input terminalsshorted.lf the readingin lest 6
is sömewhathigher (igroring the decimal point), check
for leakagecurrent. Rememberthat no solderingshould
be done on the A2 Assembly(seeParagraph7-14).

7-15.AZAsemblyExchange.

7-19. If the DC Amplifier cannot be adjustedto zero in
Paragaph 5-60 step b, it is possiblethat there may be
leakage to Guard from some point in the circuits.
Disconnectthe Guard shortingstrap from the input Low
terminal. If the offset is removedor can then be adjusted
to zero, leakage to Guard is probable. Some of the
possiblecausesare: l) Breakdownof the insulation for
power transistorQl or CRl. 2) Leakageto Guard in the
power transformer. Disconnect the small orange wire
from the transformer cable to the solder lug on the
Guard shield to check this. 3) If the instrument has one
of Options 020,021,022,030 or 040, there may be
leakageto Guard on the isolation assembly.4) A wire
clipping or other metal chip may be wedgedbetweenthe
Guard shieldand the Main Circuit AssemblyAl.

7-16. Cleanlinessof the A2 High ImpedanceAssembly
and the proper positioning of components on the
assemblyare highly important to the performanceof the
instrument. Also, A2U2 is very difficult to replace.
Consequently,a rebuilt High ImpedanceAssembly,-hpPart No. 03490-69502, has been made available to

7-20. Normal operating voltageswrthin the DC Amplifier are shown on the schematicdiagram, Figure 7-30.
To check the operation of various stages of the
amplifier, hrst set the Sample Rate control to HOLD
and disconnectthe Bootstrap Amplif-ier(white jumper
"Bootstrap"
on the Al Component Locawire, labeled

7 . 1 3D
. CA N A L 0 cC t R C U t T S .
7-14. The DC Analog TroubleshootingTree, Figure7-5,
covers the DC Amplifier, Integrator and Zeto Detect
circuits, I l0 V References,
the DC SwitchingLogic and
kvel Translatorsand the Power Supplies.

Model34904

SectionVII

tion drawing). Connect the gatesof both A2QIA and B
to ground. Connecta dc null meter (-hp- 419A) between
AITPR and ground, and adjust AlR522 from one
extreme to the other. If this point adjusts both positive
and negative, the amplifier is probably operating correctly, and the Bootstrap Amplifier should be checked.
If AITPR will not adjust both positive and negative,
connect the dc null meter betweenthe sourceof A2Ql B
and add adjust AlR522 Io both extremes.The voltage
should adjust both positive and negative.Each stage of
the amplifier can be checked in the same manner,
connecting the dc null meter between the collectors of
A1Q509A and B, the emittersof A1Q505and AlQ508,
the collectorsof AlQ506 and AlQ507, or the emitters
o f A l Q 5 1 0 a n dA l Q 5 1 1 .

TRIGGER

SCOPE AT A1TPK, + SLOPE.

Alu401

6

nlii,,,
0 . 1 ,t . t 0 v

10
tt
12

TRIGGER SCOPE AT A].TPK, + SLOPE.
CHECK WAVEFORMS TO SEE ONLY IF
. 17 V AND. 20 V LEVELS OCCUR AT
THECORRECTTIMES.
DURING ALL
OTHER INTERVALS, WAVEFORMS
SHOULD COR RESPOND TO THE BOOT.
STRAP VOLTAGE.
TIME {ß1.
&
&2

1

&

13
17
t8
l9

20
t

i

l

AAiGE

21
-t7v

1

AtL
0 . 1 ,t . 1 0 v

2.5 ALt

3

0.t,1,rmr

3

to,rKV

a

' 4 e o a - a ' 2 s 4 6* T I M E

sHowN AppLlEs ro TNSTRUMENTS
DESIGNED FOR 60 Hz LINE oPERATIoN.
FOR 50 Hz INSTRUMENTS,
INCREASE
TIME BY 2Oolo.

t@,tKv

Figure7-2. SwitchingOutputs of A1U401.
r0

0 . 1 ,r , 1 0 v

7-21. After these checks and following repair of the DC
Amplifier, the DC Amp. Zero control shouldbe adiusted
usingthe following procedure:
a.' Set 3490A FUNCTION to TEST, RANGE to 2,
SAMPLE RATE to FAST.

16

ATL

b. Connecta clip lead acrossA2C3.

't

c. Adjust AlR522 for a display of +.000010 to
-.000026.

J
19

ATL

2I

ALL

23

0_l v

'l-22.
DCAmplifier
Switching
Gircuits.

TIME SHOWN APPLIES TO INSTRU.
MENTS DESIGNED FoR 60 Hz LINE
OPERATION.
FoR 50 Hz INsTRUMENTs, INCREASE TIME BY 2OOIO.

Figure7-1. Switching Inputs to A2U2.

7-23. Figwe 7-l shows the inputs to the DC Amplifier
input switching FET's. Waveformsat the connections to
A2U2 should be compared to the bootstrap waveform at
the white jumper on A2 (labeled "Bootstrap" on the
Component L.ocationdrawing). The "OFF" voltage level
of - l7 V or - 20 V must be correct. During the ..ON"
time, when the waveform is more positivethan - 17 V,
the waveform should correspond to the bootstrap
waveform.
7-24. The switching outputs of the DC Logic ROM,
shownin Figure7-2, should be as shownin eachcase.

t-3

SectionVII

Model3490A

7-25.Replacement
of OCR30l.

Table 7-3. AC Reed Relay Checks.

7-26. If it is necessary
to replacethe referencetransis_
tor-diodepackageAleCR3Ol, it is also necessary
to
replaceresistors
A1R306,309,310, 313, 314and:t5,
which are matchedto eCR3Ol. Matchedresistorsare
suppliedwith the replacement
reference,
eCR30l.

Ranges
Affected

7-29.
types of problems,such äs amplifier offset
..Some
or failure, may be f9un9 UV setting the
Sampte Rate
control to HOLD and making dc voliage
rn.urur"rn.nt,
within the circuits. For inslance, boih inputs
to an
operational amplifier should be equal and
near zero. To
check the balance of a dual FST, such
u, qZOO fo.
example, first remove the microciriuit
ampiifrer (U201
in this.case)from its socket.Connect
Uotf,'pfif gatesto
ground, and measurethe source
voltages,which should
These voltagesmay be *"urirrä at pins
2 and
!" :gyd.
3 of the open U20l socket.
7-30. Mth .the instrument sampling and
with a full_
rangeinput, the x20 Amplifier ouipuishould
not exceed
| .2 to | .4 V becauseof the diodesi"t*..n
tfr" amplifier
input and-output. Also with a full_range
i"p"t, tfräZt,r"
detect reference voltage at pin 3 of*U203
should be
approximately 1 50 mV during run_up
una ,u"_Oo*n.,"
No^nJinearity of negative readiigs rnuy
U, "uured by a
defectiveamptifier,ü201.

7 . 3 I .I N T E G R A T T
ORRO U B L E S H O O T I N G .
7-32. the integrator may cause noise
on full scale
readingsin the dc mode. If this occurs,
check AlR207,
Q206, Q207, tJ2Ot and u202.If theie i, noirc at low
input ievels (ie., 100 mV input on l0
V dc range),check
AIC2O7. AlQ209 will be very noisy if pinch_äff
voltage
is not correct. To check for ä noisy
eäOg, increusettre
supply and observenoise. The increase
!7y
in the
+ 17 V supply increasesthe
bias on aZOS,li
-uoriuge,
the noise

9Jt:qq.i"
snoud be

at a higher+ 17y ,upprv

e209

replaced. Readjust the + 17 V supply per
Paragraph5-54.

7 . 3 3A
. CC O N V E B TTER
RO U B L E S H O O T I N G .
NOTE
The indication on all rangeswith
the input
shorted will not be zero but should
be'less
than 50 counts.
1:7

PossibleCauses

1 0 0v
verload 1 V input on 100 V range
1000v l O
r e s u l t si n 10 0 V d i s p l a y
I
,IV I

7-21.A-to-D
C0NVERSt0N
CtBCUtT
CHECKS.
7-28. Ttre Analogto-Dgital (A_to_D)Conversioncircuits
consist of the Integrator, the x20 Amplifier,
and the
Zero Detect circuits. Some problern, in th"r, circuits
be detected by applying a full_rangeinput voltage.
Tay
For example,the Integrator output *"öfo..
at AlTpl
may be checkedwith a _ lOV input on the
l0Vdc
range. The center portion of the waveform (10
ms
between
_run-up and run_down) should be flat. if *ri,
portion decays,this may_indicate leakagein
the Integra_
tor capacitor, C2O3.If the waveform continues
to rise,
the input switches e20,1 and
e205 may not be
completely cut off during this period.

Symptoms

1 0 v II

DisOlay is one-half the input value

K2 Shorted

K2 open

I

I V Low input impedance,approx. 2O kS-t
10v I
1 0 0v
ro00 v

O v e r l o a d- I V i n p u t o n 1 0 0 V r a n g e
r e s u l t si n 5 O V d i s p t a y .

1 V D i s p l a yi s l / 1 0 t h e i n p u t v a l u e
too v

K3 shorted

K3 open

K4 shorred

1 0 v Overload
r000v

K4 open

7-34. Operation of the AC Converter circuits
may be
the Troubleshooting Tree, Figure 7_6.
*::k.9,using
Table 7-3 lists a number of symptöms associated
with
reed relay failures.
7-35. Cleanliness
of certain componentsand areasof the
AC Converter Assembly are critical to the performance
of the AC Voltmeter circuits. The assemblyshould
be
handled only by the board extractors, anä should
be
cleanedthoroughly following any repair.
7-36. Certaincomponentson the AC Converter Assem_
bly must be spacedthe correct distancefrom the printed
circuit board for proper operation of the circuit. Table
74 lists these componentsand the proper spacingthat
must be observedduring repair.
.

Table 74. ComponentSpacing.
Designator
A6-

Spacin g_fro m corn ponäit-c"nt",
ro l,rtnted Circuit Board
Minimum

cl
c2
c3
c5
R1A
R1B
R44
R4B
R4C

0 . 1i n
O . 1i n
0 . 1i n
0 . 1i n
0.4 in
0 . 1i n
0.4 in
0 . 1i n
0 . 1i n

Maximum

O . 2i n
u-2 tn

O.2in
O.2in
O.5in
O . 2i n
0.5 in
O . 2i n
O.2in

7 - 3 7O
. HMS
C O N V E R TTER
BO U B L E S H O O T I N G .
7-38. The Ohms Converter Troubleshooting
Tree, Fig_
ure 7-7, may be used to locate the trouble if tn.
Onr
C-onverterdoes not operatecorrectly. Make surethe
DC
Voltmeter operation is correct before beginnrng
the
OhmsConverterchecks_
7-39. The cleanliness of some areas of the Ohms
C_onverterAssembly is important to proper operation.
Handle the printed circuit board only'by ihe extracton,
and cleanthe repairedareathoroudily.

SectionVII

Model3490A
TROUBTESHOOTING.
7.40.DISPLAY
"Ihe Display Troubleshooting Tree, Figure 7-8,
741.
mav be used io troubleshoot a defective display' The
nuäerical display units and the polarity unit may be
most easily checkedby substitutinga known good unit'
Access to the Display Assembly is gained by removing
the 3490A top trim strip and the tfuee vertical screws
securingthe diiplay heat sink to the guard shield'

TU
I NGGG E S T I O N S .
CB O U B L E S H O OS
742. LOGIT
743. Severalmicrocircuits in the logic section may be
checked by observing the inputs and outputs of the
"Q" output of a D flip-flop, for example,
device. The
"D" input if the flipflop is being
should agreewith the
clocked. (See AlU6, 7, 71, 14, 17,20 md 22.) The
"0" to "1" transition of the
output is changedby the
clock input. Also, the output of an inverter (AlU8 and
10) should be the logicalinverseof its input.
744. lf incorrect readingsare observedon the logic test,
pull AlU2, 3, 9 and 16 and reinstate,taking careto seat
leadsproperly in their sockets.AlU2,3, 9 and 16 may
be checkedby substitutinga known good device.
'745.

:i

l
ii

j;

:l

.:'
a;

,'
.,1

,J

i

Certain microcircuits may be associated with
particular malfunctions. A1Ul9 utd 2l deal with programmingthe 3490A rangeand function. AlUl5 and24
are associated with sampling and sample rate delays.
AlUl5 also dealswith function delays.
746. If decimal point or ranging problems cannot be
located by using the troubleshootingtrees,the trouble
may be in the display, the front panel switching, or the
optional Remote Assembly. The decimal points in the
display are switched during the LOW true enablesignals
to the display units (seeFigure 7-8).
747. If the instrument does not sample, the logic
circuits may be locked in a certain state or sequence.
Turn the instrument off. While holding the manual
pushbutton depressed,turn the instrument back on anil.
observe the states of logic signals YMA through YMG
with an oscilloscope(see Figure 7-24). Theseare found
at test points O, T, P, S, Q, N and J in the logic section
of ,the main circuit board. Test point O should be a
steady HIGH, and all othersLOW. If theselevelsare.not
correct, the Read Only Memory, AlU9, or one of the
State Storage flip-flops may be defective. If all seven
sigrals are correct, releasethe pushbutton and check the
test points again with the oscilloscope. If all levels are
the same as before (TPO HIGH and all others LOW), the
normally closed contacts of the pushbutton switch may
not be making contact. Check to seeif the pushbutton is
binding in the center of the SampleRate knob.

7 . 4 8D
. A T AO U T P UTTR O U B T E S H O O T I N G
(0ption021).
749. Ceftan types of failuresin the output information
may be traced to certain circuits in the Data Output
Assemblies.Table 7-5 lists a number of svmptomsand

Table7-5. DataOutput Troubleshooting
Tips.
Symptoms
Measurerent Intotmatioo:
No data output
No dab output and no polarity, overload,
or overrange
odd numbers in any digit
2's,3's.6's, or 7's in any digit
4's,5's,6'!, tr 7's in any digit
8's or 9's in any digit

No
No
No
No

Probablo Cau$

A9U9
A9U6
A10U1,2,3,7
A 1 0 U 1, 2 , 4 , 7
A10U1,2,5,7
A 1 0 u 1, 2 , 6 , 7

Range Intorrotion:
No range data output
No range and no funcion data output
No odd numbered range data
Ranges 2,3, and 6 do not print correctly
Ranges 4,5, and 6 do not print correctly

AgU7
AgU6
41OU3
AlOU4
A1OU5

Fundion lnformation:
No {unction data output
No tunction and no range output
* not correct
Functions 1, 3, 5, 7,9, -, A, and
* not correct
Functions 2, 3, 6. 7. +, -, O, and
Functions4,5, 6,7, V. A, f|, and' not correct
i not corrrct
Functions 8, 9, +, -, V, A, O, and

AgU7
A9U6
A1OU3
A1OU4
A1OU5
AlOU6

Polaritv, Overload, Overrange. Sample/Hold,
and Remote Mode Intormtion:
None of the above outputs correct
None oI the abow and no range output
No polarity output
No overload outPJlt
No overrange output
No Sample/Hold Mode outPüt
No Remote Mode output

A9U7
AgU6
A1OUs
A 1O U 6
A1OU3
AlOU6
A10U6

their probable causes.Refer also to the Data Output
TroubleshootingTree, Figure7-1l.

7 . 5 0R
. E M O TCEO N T R O
TL
ROUBLESHOOTING
(0ption022).
7-51. Refer to the Remote TroubleshootingTree, Figure 7-12,for information for troubleshootinethe remote
control circuits.

7-52.cPlBTROUBLESH00TtNc
(0ption030).
7-53.General
Ghecks
7-54. lf the 34904 with Option 030 does not operate
correctly, first determine whether the trouble is in the
I/O circuit or the main 3490A circuits.The performance
checksin SectionV may be used to determine whether
the instrument operatesproperly in standardmultimeter
operation. Make sure the I/O plug-in printed circuit
boardsare seatedproperly in their sockets,and that the
ribbon cable connectors are inserted properly. Also
make certain that all microcircuit packagesare seated
firmly in the sockets.
7-55. Troubleshooting
Method.
7-56. The logic circuits which make up the GPIB option
are very difficult to troublestroot by the normal component method of troubleshooting.Consequently,a GPIB
Repair Kit, -hp- Part No. 03490-80009,has been made
availableto facilitate fast and efficient on-site and bench
repair of the GPIB I/O Interface Option. The GPIB
Repair Kit consists of five assemblies(*rp Part No.
0349G60613, 46532, -66533, -66534and -66536), and
six parts kits (hp Part No. 03490€0013, {0031,
-80032, -80033, -80034 and -80036), which are individually available. See Table 6-1 for description of
assembliesand parts kits. This table also provides a

7-5

Section VII

breakdown of individual components contained in the
Repair Kit and their respective parts kits. The printed
circuit assembliesprovided in the repair kit may be
substituted for assembliesin the instrument in order to
isolate the trouble. A kit of microcircuit packagesfor
each assembly is provided so that once the trouble has
been isolated to an assembly,the defectivemicrocircuits
on that assemblymay be replaced. A system controller
and a printer are required for troubleshooting the I/O
circuits. These may be the controller and printer in the
system in which the 3490A is used. A dc voltmeter is
also required. The GPIB Troubleshooting Tree, Figure
7-13, checksmost of the 3490A I/O circuits.

Trigger
CircuitGheck.
7-57.External

Model3490A

742. lt it becomesnecessaryto separatethe Sample/
Hold printed circuit assembliesin order to replace
certain components,it is preferablenot to disassemble
more than necessary.For example,if a repair is to be
made to the Analog Assembly,A21,the flexible shield
should not be removedfrom A28. If the unit has been
disassembled,
use the following procedure and Figure
7-3 for reassembly.
a. Place Logic Assembly A28 (item 3 in Figure 7-3)
component side down on work surface.Place4 spacers
(item 4) over the four captive spacersin L28.
b. Carefully put flexible shield in place, aligning
holesin shieldwith the spacers.

7-58. The external trigger circuits may be checked by
the following procedure.

c. Secure shield to A28, using two nylon screws
(item 6) in the two holes nearestthe bottom edge of
A28.These screwsmust be non-metallic.

a. Place 3490L in local control by setting the
RemoteControl Enableline (LREN) to HIGH.

d. Placetwo spacers(item 4) on top of the other two
holesin flexible shield.

b. Set front panel SAMPLE RATE control to HOLD.
Check logic level of External Trigger Flag (LETF) at Jl I
pin 4. Measureto outguardground at pin 8 or 14 of Jl l,
or on Outguard Data Assembly A33. LETF should be
LOW until an external trigger command is given.If not,
c h e c kA 3 1 Q l .

e. Place Analog Assembly,A27, component side up
over the two spacersin step d and securewith the screws
(item 8).

c. Momentarily connect Jl l pin 7 to outguard
ground. 349OA should sample each time pin 7 is
grounded. If not, check A3lQ2 and associatedcomponents, including pulse transformerTl. If the instrument
doesnot have the Sample/Holdoption, a jumper should
be installed in place of Tl. Make sure this jumper is.
seatedproperly in the correct sockets.

7 . 5 9S
. A M P L E / H OSLEDR V I C I N G .
Gircuits.
7-60.Accesto Sample/Hold
7-61. The Sample/Hold Analog and Logic printed circuit assemblies,A27 and A28, are fastenedtogetherand,
must be removed from their socketsas a unit. Printed
circuit extender boards (Part Nos. 5060-6032 and
5060-5983, supplied with the 3490A Option 040/045)
may be used to mount the Sample/Holdassemblies
high
enough for accessto the circuits. The metal shield
covering the Logic assemblymay be removed without
separatingthe two assemblies.Do not separatethese
assembliesunless it becomes necessaryin order to
replacecomponents.

The Analog Assembly,A2T,especiallythose
oreas in the vicinit)' of the teflon insulators,
must be kept cleon and free from ftngerprints or other contamination, or Samplef
Hold performsnce m6v be degraded.

74

f. Securealuminum shield (item 2) over component
sideof A28, usingfour screws(item l).
g. Connect brown, red and orangewires from A28 to
pins l, 2 and 3, respectively,on A27.

Assemthe 3490Awith Sample/Hold
7-63.0perating
hliesRemoved.
7-64. lf a problem exists in the Sample/Hold circuits
which affects operationof the 3490A with Sample/Hold
off, the S/H Analog and Logic Assemblies,A21 and
A28, may be removed and replacedby jumper boards,
which are suppliedwith the Sample/Holdoption. These
boards complete the circuits necessaryto allow the
3490A to operate (see Figure 4-27). The wire disconnected from the Analog assemblymust be connectedto
the pin on the Analog Jumper Board for proper
operation.Five pins are also provided at the left end of
the Logic Jumper Board for terminating the wires
disconnectedfrom the Logic assembly.These pins are
not connectedto any circuitry.

I NEGE S .
7 . 6 5S
. A M P T E / H OTLRDO U B L E S H O OT R
l-66. Two troubleshootingtreesare provided to assistin
isolating problems in instruments with Sample/Hold.
The S/H GeneralTroubleshootingTree, Figure 7-14, is
designedto determine if the trouble is in the Sample/
Hold circuits or in other circuits in the 3490A. If it is
determined that the trouble is indeed in the Samplei
Hold circuits, this tree will also help determinewhether
it is in the analog or logic circuits. The Logic Troublein
shooting Tree, Figure7-15, providesfurther assistance
isolatingtrouble in the Sample/Holdlogic circuits.

SectionVII

Model3490A

/
,.\

QY

/

/

L_/

\

Item
1
2

3
4
5
6
7
8

Description
4 - 40 X 114wn headmachinescrew
Shield,aluminum
LogicAssembly,428
Spacer,.156 LongX .125 lD X .250OD
Shield,flexible
4 -40 X 3/8 nylon pan headmachinescrew
AnalogAssembly,427
4 - 40 5lA pan headmachinescrew

trp- Part No.

22000139
03490-006(M
03490€6528
03804520
o3490-27301
220047o'4
o3490€6527
2200.0149

Figure7-3. Sample/HoldAssembly.

7-1

SectionVII

7.67R
. ATIO
TBOUBLESHOOTING.
l-68. If ratio measurementsare not correct and the
trouble cannot be corrected by the Adjustment proce_
dure, or if the adjustmentscannot be made correctlv.
the following troubleshooting information should be
used. Check for obvious sourcesof trouble, such as
burned or loose componentsor loose wires.Make sure
the printed circuit board, Al3, is seatedfirmly in its
connector, and that the cable, W8, and the three
operationalamplifiersare seatedfirmly in their sockets.
7-69. ExternalReference
Amplifier Checks
7-70. The Ratio Troubleshooting Tree, Figure 7_16,
checks the External ReferenceAmplifier circuits. How_
ever, correct interpretation of the display symptomsis
neededto determineif the trouble is in the ämphneror
logic circuits. For example,if the displayreadsapproxi_
mately 75% of normal (l0V Input/tOV Exi. nef.
= 07.5000), the trouble is probably
in the amplifier
circuits. If the display readsOverloadfor both positive
and negativeinputs (at INPUT terminals),the trouble is
probably in the amplifier circuits, but if it reads
Overloadfor only one input polarity, the trouble is more
likely in the logic circuits. If the displayed polarity is
incorrect and the display reads Overload, check the
polarity logic circuits.

7-71.AmplifierZerc0ffset.
7-12. lf the ReferenceAmplifier zero adiustmentsin
steps a through h of the Ratio Adjustment procedure
cannot be made correctly, the trouble may be leakagein
either AI3CR2 or 3. This condition can be most easily
checked by unsoldering one lead of each diode and
trying the zero procedureagain.If the amplifierscan 6e
zeroed with the diodes disconnected,one or both of
them is defective.

Model34904

b. Set FUNCTION to DC and apply full-rangeinput
on either the 1 V or l0 V range.Selectthe combination
of INPUT and EXT REF polarity that causesthe display
to readOverload.
c. Set SAMPLE RATE to HOLD. Check logic levels
within ReferencePolarity Logic circuits as indicated on
the schematic diagram, Figure j-22. Losic
H I G H= + 2 . 4 V t o + 5 V . L O W= 0 t o + 0 . 6V .

7.75.SCHEMATIC
NOTES.
7-76. tll.e following notes apply in general to all
schematicdiagrams:
a. Partial reference designationsare shown. prefix
with asembly or subassemblydesigration(s)or
both for completedesignation.
b. Component values are shown as follows unless
otherwisenoted:
Capacitancein microfarads
Resistancein ohms
c. * Averagevalue shown. Optimum value selected
at factory.
I

d. =

Denotesearth ground.

e. I

Denoteschassisor frame ground.

f.

Denotesfloatablecircuit ground.

f

- qP
V Denotesprinted circuit assemblyground.
.9.
Denotes assemblyoutline.
Denotes subassemblyoutline.

7-73. ReferencePolarityLogic Checks
7-74. ln the 3490A measurementsystem,if the Input
voltage is positive, a negativereferenceis requiredior
run-down, and vice versa. In ratio measurements,the
applied External Referencevoltageis invertedand these
two voltagesare substitutedfor the positiveand negative
intemal referencevoltages.The Referencepolarity Logic
on the Ratio Assembly,A13, makes it possibleto use
either polarity Externai Referenceinp,lt ,itt .itt u
polarity Input voltageby selectingthe öorrectreference
polarity for rundown. If a failure in the Reference
Polarity Logic causesthe reference voltaqe used for
run{own to be the same polarity as the Input, the
display will indicate Overloäd. If the 3490A operares
correctly in dc voltage measurementswith inputs
of
both polarities. but reads Overload with one polarity
input in ratio measurements,check the Reference
Polaritl' Logic as follows:

Denotes main sigral path.

k.

Denotesfeedbackpath.

l. l------l

Denotesscrewdriveradjust.
n.Wl

Denotes wire color. Color code is the same
as the resistor color code. First number
identifies the base color; second identifies
the wider strip; and third number identifies
the narrower strip (e.g. 924 = white, red,
yellow).

" 3

Denotesschematicnumberon which con-

Y

a - S e t R { T I O s w i t c ht o E X T R E F l 0 V a n d a p p l y
l0 \'to EXT REF terminals.
--]

Denotesfront panelmarkings.

p. A

nection is maije.

Referto manualbackdating,
SectionVIII.

SectionVII

Model3490A
GATESYMBOLS.
7.77.LOGIC
7 -78. L humber of logic gateintegratedcircuits areused
in the 3490A. Most of theseare TTL circuits, in which
the HIGH logic level is 2+ 2.4 V and LOW is (r 0'5 V.
The normal symbol used to indicate a 2-input NAND
Gateis shown below, accompaniedby the truth table.

The NAND Gate may also be used as an inverter by
connectingone input permanentlyto HIGH (+ 5 V). In
this case,the circuit may be shown as follows.

+5V

A
A
C

NAND GATE

Truth Table
A
B
C
L
L
H
H
L
H

L
H
H

H
H
L

As the truth table indicates, both inputs must be HIGH
(true) to obtain a LOW output. The purposeofthe circle
(invert symbol) at the gate output might then be
assumed to indicate that the signal is LOW true at that
point. The truth statement for this NAND Gate may be
"A LOW signalat either input resultsin
restatedto read,
a HIGH output," and the same truth table applies.In
keeping with this statement and the use of the circle to
"OR" function
indicate a LOW true sigtal, the following
symbol may be used.

Note that the same truth table applies,and that if one
input is held HIGH, the output is the inverse of the
other input.
7-76. Another gate circuit used is the Exclusive OR
Gate,normally drawn:
Truth Table

ExclusiveOR Gate

A

B

C

L

L

L

H

L

H

L

H

H

H

H

L

Note from the truth table that the output is HIGH if
one, and only one, input is HIGH. Whenboth inputs are
either HIGH or LOW, the output is LOW. If one input is
held LOW (connected to ground, for example) at all
times, the output follows the other input. Whenusedin
this manner,this symbol may be used.

In some cases,a NAND Gate circuit may be used to
invert a logic signal.This may be done by connecting the
same sigral to both inputs. If this is done, the following
symbol may be used, indicating that the circuit merely
inverts the sienal.

If one input is held HIGH (+ 5 V), an inverter symbol
-, may bg used, becausethe output becomesthe inverseof
the input.
If the input sigral is LOW true, the circle may be placed
on the input side of the symbol.

+5V

7-9

SectionVII
Model 3490A
Table 7-6. AlphabeticalListing of 34g0A
Mnemonics.
Mnemonic
LACI
LACO
HAUT
HAZD
LCDC
HCOC
LCDF
lgER
HCES
f9!C
f9yA
i9yg
l9yc
LCOV
HCRA
HCRB
HCRC
LCSO
LCTC
HDCA
LIR
HIRA
HIBB
HIRC
LLEC
HMA
HMB
HMC
HMD
ly9A
Iy?q
Iy?C
HME
HMF
HMG
ryryg
ly!9
LMOT
llygf
ly99
ly99
lIgD
.:yy?
:y:_a
:yy:
LMRF
HOCB
HDCC
HDCD
HOFL
LDNR
HDPP

Description

Source

U22 or Rarioor

s/H oprion
H preceding mnemonic means HIGH
is true;
L means LOW is true.

-

1i,

Mnemonic

AC input enabte
Aru4ot
lr_eOn
AC conwrter output switch
Al u401
| r_exe
Internal autorange
F r o mH F A To r A l 1U 1I
grar
I
Analog zero detect
41U203
| rrra
Clear data counter
41U16
| Hrra
Clear data counter
A1U23
| xrne
Changedata ftag (HDFL)
A
l
u
1
6
| nrne
Changeend of reading {LEORI
A1U16
| srnc
Close electronic switch
Alus
Changehundred thousnd count select ( H S H C )
l nrsc
U16
t LFTX
Changemain time bit A (HMTA)
u16
l r-nrvc
chanse main time bit B (HMTB)
u16
llrr_o
Chanse main time bir C (HMTC)
u
1
6
llre
Ctock overtoad
u
1
6
lHrre
Combined range brt A
5 4o r A t l U 1 I
I Hrre
Combined range bit B
S4orA11U11
l
ltC
Combined range brr C
54orAllul1
ltrnrp
Clear stord outpurs
Clear time @unter
Y19
| r-r'vs
Data Counter bit A
Yl6
| r-roc
ul
I ilr.are
Xt Atten reed
u401
| xMre
Internal range bit A
u21
| xrvrrC
I n t e r n a lr a r E e b i t g
u2t
I lore
I n t e r n a lr a n g eb i t C
u21
| lorn
Leakagecontrol
u4o1
| r-orurn
Machine state bir A
Next stareoutputsfrom
I iors
Machine state bit B
BOM U9, presentstate
I frovp
Machine state bit C
outpursfrom state
Machine state bit D
I Hovt_
storageU7, U 17.
Main time bit A detayed
I f_pnf
From Sample/Hotd
option I f_pnC
Main time bit B detayed
if not instailed these signats
Main time bit C detayed
I ffnep
aresmeasHMTA,B,C.
I HSn
Machine state bit E
(se HMAI
I HSe
Machine state bit F
(SeeHMA)
| rSC
Machine state bit G
(SeeHMA)
| HSCK
Manual button normaly ctosed contact
s58
| LScx
Manuat button normaily open contact
ssB
I 1-5nc
Memory output
r,!r
I usnc
Machine quatifier setection bir
A
ulo
I r_spr_
Machine quatifier setectaonbit B
ulo
I usse
Machine quatifier set&tion bir C
u10
| HSSB
Machine quatifier setection bit D
u10
| HSSC
Machine quatifier setection bit D
ue
I lrcr
Machine quatifier setection bit E
uto
I Hrcz
Machine quatif ier setection bit E
u9
| srca
- Ref select
u401
Data Counter bit B
ul
I Hrcl6 .
D a t a C o u n t e rb i t C
ul
Hrca2
I
Data Counter bit D
"
ul
I Hrrs
Data Fte
uzo
LTXF
I
DownraÄe
u16
I lroru
Oisplay p-olaritv

I

r-Upn

I nzof

Description

End of reading
External encode
Front panel autorange
Front panel function bit A
Front panel function bit B
Front panel range bit A
Front panel range bit g
Front panel range bit C
Fast state clock
False transfer
Xl0O Gain
Hold (stops interwl sampting)
Xl Atten
Internal function bit A
Internat function bit B
X1 Gain
Input polarity
Input short
X10 Gain
Main time bit A
Main time.bit B
Main time bit C
X0.01 Atten
X0.01 Atten, reed
Ohms ref select
Output enable to decoder
Overload protection
O\rerload
+ Ref select
Preset range
Ratio polarity
Display scan A
Display scan B
Oisplay scan C
State clock
State clock
Select + 100,000 counts
Select + 1OO,0OO
@unts
Store polarity
Sample rate switch bit A
Sample rate sitcfi bit B
Sample rate ilitch bit C
Time count 1 (+ l0,OO0 or +l@,OOOI
Time count 2
Time count 4
Time count I
Time count l6
Time count 32
Transfer enable
Transfer
Turnon, low for approx. 100 ms after turn-on
Uprange
Zero detect

Source
u14
422U1
s4A
S3

s3
5 4o r A 1 1 U 1 1
54orAltUl1
54or41tU11
U3
u16
u401
S5A or A22Ul
u401
F r o m5 3 o r A t t U l O
F r o m5 3 o r A t l U t O
u401
U2?
u401
u40l
ul4
ul1
ul 1
u401
u401
u401
U9
u401
u22
u401
ul6
U22 or Ratio option
A3U2
A3U2
43U2
v4
U4
U6
U6
ul6

s5A
s5B
s5c
Q1
U6
u12
u12
vl2
U9
u18
o3
ul6
u23

- 5v c-u wG
+r?v6-UwH
-t7v6\wr

43zt
aaaa

+5vcttwJ

f  tz2v.

Set S6mple Ratö to FASTTrigg€r spe
on AITPK,
+.lope. Check .ll output
of Alt401.
Wawform
$ould
be ei sh@n in
F'rlure 7-2.

Set Sample RaE to HOLD.
+1V
Apply
inrt,
M@süre
rcltage
drop
dos
42R7. Should b€
do rcltaqe drop,

3. The rire 6twn
on wffilqBs
i3 @rd
lor in*rlmnrs
deiigned lor @ Hz line op@tbnFq 50 Hz in*rurunr.,
i.s@ti[Eby2o*.
.,
Trcubl€Cr@t
dc
lewl
tarclatoc
asiated
with
inddd
A2U2
GG
to.c, Se Figure 7-?O.

YES

R€pla@ Az.wilh
asfilcly,
Seo
7,14.

ex.tEngs
P&.g6ph

Trorble$@t
Oäl€
ProlEtion ck@ib-

Trouble.hoor
FET
sitchB
A10204,
205,
2G, and 209 by m€suring
gate-tosur@
voltages,
with Sample Rate set to
HOLD.
Volbg6 3hould be:

AlAl
TPA.
Repla@
A1U2O2 in ocks.
Wirh
Sample Rae in HOLD,
monitor AiAITPA
with
(41C207 shortedl
sp€.
Adju$ AlAl
R210
extrere to the othor.
TPA should 6ry
- 0.6 V
b
{fully dl
+ 0.6 V (fully cil).

O HOLD,
ith @p€
Conned

A1c.207.
l0 from
h€ orher.

-5V
Db@nnet
lrom
A'lA1TPA
and @nned
TPA to Ground,

o2or
0205
0208
ozx,

0v
-5 V
0v
ov

Perfo.m DC Zero Adjustrunta,
Parag6ph
555,
after repair.
Remove A1U2O2 from
ocket. Connect AITP| to
Ground. Conn@t dc null
ffier
betreen sure
of
A1O2O7A.nd sure
of
A1O2O7B. Volbge ihould
be O t l0 mV. lf y6,
adiüs AlAt
R210 for
rclbgp
aa n€r
z€ro as
M6sure gate-brcsible.
source
voltage
of
A1O2OTA and g. Gate
should b€ approx. - 1.5 V
with r6rd
to sure.

Remve 41U2O1. Conned
dc null wltmter
b*wen
eur@ of 41O206A and
surce of AIO2OOB. Voltage should be 0 t 40 mV.
lf y6, adjus AlAl R210
for bltage at n@f zslo as
posible. M€aure gate-tosource
voltage
of
AlOZ)GA
end B. Gate
shoold b€ approx. -1.5V
with rspoct to $wce.

Repla@ AlU2O2 with ns
p6rt and pefform Dc zerc
Adiusmnts,
Parag6ph

Redae A1O2O7 and pertorm
DC
Zero
Adiusrcnß,
ParagEph

Replee AlU20l with new
part and pertorm DC Zero
Adiu*tunts, Pe. 565,

F
.

5€s.

Connet
dc null mt6
bdwen
A'ITPR
and
Grourd. Volbge should be
0r30mV.

Eint
i 0 v

tl/leere
6lbge
at + Ref
Bt
on A2 with
Fint
+digit DVM. Should be
+ t0 v t m.oo30 v.

Diiconnsct
iump€r

on

B@ffi6o
A2.

Conned

led from A1TPR to
6 oI A2O1 (O1A s.te).
Conned
anothff
dip le6d
(OtA
trom pin 3 of A2Ol

- Ret ilnffiTroubletr@t
ing Ampl Figre 7-22.

to Ground. Measure
berw@n A1 TPR
and g.ound with dc null
Mer.
Should be 0 1
30 mV.

Adiust AlR522 from om
extreme to the other. Volta!ß at AITPR rholld 6ry
approximately
from
+ 30,mV b - g) mV.

asritly.
?-14. Al$
7-16.

Sa
se

Pa.agEph
PaEgraph

Troublerhoot DC Ampli.
tier. S€e Paragraph 7-16.

Tror6le*r@t
+ Ret Sutr
ply. FigureT-22. Se PaE"
gtzpl\ 7 -24.

Troubleshoot DC Amditift. Sa PaEgräph 7-l 6.

Figure7-5. DC Analog TroubleshootingTree.

7-r317-1

: ! - . : = :) l : B : .
:,}:r*,,3'3:,.

,i: :
.'

[:üqüffi

J5

1ü::ö
si:st
ö.:iil

u40l

Frequency-Related Accuracy Problems
Fr.quency at which
Spcifi6lion
is
Exc6dsd

RangE od which
Error Occurs

Posible CauP

1OO Hz (low
frequency onlyl

All ran96
1 Vand IOOV
1 0 V a n d 1 O O 0V
10O V and 1000 V

R4A or R4B
R4B or R27
R4C or R28
R1A,8or R3

20 kHz - 30 kHz
{midband only}

All rangeslVand1O0V
lOVand1OOOV
100 V and 1OOOV

C3 or C25
C3 or C26
C2 or C5

'100kHz (high
{r.equencyonly}

All ranges
1 Vand1O0V
10 V and 10OOV
IOOV and 1OOO
V

C3, R29A, B, or R32
C26,C27,or C28
C2, C4, C5,or C6

c5.c6 a Lt.L2
ARE ON BACKSIDE

acoutrt

a
a-REF
+REF

hP Pott No. O349O-66502
Rev. C

| |
l l

l['l
|

|

-fr

_

RrB___-c

= : E

+tr

:1-

l.:l---.]
tJ

L--l I ce | -co-

R4a

F-cz:-

r-t

l.r-1

lll

.u-r-.-----U

l l l l
l F l l r l -

=FÄl- LJ !,.

x 4

,l , fl-

l l P : - E
r r ) - - +

Y .+,

I Ec--

lczzl

,^,,:z)

Irl

ra'" G
TN liffml''*i,l++*
'il++ | 1"6;
I 'T-_l I
tnt tl
Q9e, r-L--.
z\
-Eet+r+l l ' l"- Il l
I'l+
L f T Jl l t
c,6
o(o8)Föö

(c

V I

l

r

r

^

,

^

V

( u 4 J ' , , . , ' , , r 1|

f ol

A6
h p P o r rN o .0 3 4 9 0 - 6 6 5 0 6
Rev I

+_.JL

SEE NOTES

14904- c - 299A

3. The time shmn on waveforms is @r(ect for instruments designd foa 4.t4,:'
|ineoFration.For5oHzinstruments,incr€setimeshownby20%;

a. st

$wA

b. Aply

tsuNu I tuN ro Au,

input of 10 V ar 100 Hz.

6Vto-7V

, , iliii#;, ,i
;_r;;rs6tl
I 'f v4 F
v ivü:!:t t{ #
t tl :

tttta

*iii,tif6l:..it@i6

tigl:,ii

.14,iä,
:*,rii'.i

Ser FUNCTION ro AC.
Apply Iull,range input at
100 H2 on each range.
Monitor convener output
at white wire. Should be
+1V 10.002Vforfullßnge Input on each range,

High lmpedane Assy.
montto. pin 18 ol

"-*"rti,"r"
as AC Converterout+l v r0.002v for

preent?

ange input.

NO

'_:
i
Check conriection'
wire) b۟en
46 at

ä

Troubleshoot A6 reed re.

i ffi ##'.r,.rllt{i+WQrr,..',,:,.
;
:r,,,,tjjf*-ilsss8iiii..r,
. .ffi,

1 V range and apply

Select
input

ol

Monilor

t,?rSlI*

wire
end

1 V

at

100H2.

iignal

at

connected

to

of

A6Kl

with

white
lower
s@pe.
as in-

be the sme
Should
put signal at top end

of

A6K1

Apply Iull-range inpul al
10OHz on @ch range
nitor A6TP2

g,#h
Troubl6h@t
Filter.
Circuit.
SeeNote 4.

Troubleshoot 46Kl
and
driver circuil. See Note 4.

NOTES:
1. DC vollmeter circuits, including logic, must be oFraling correctly betore this
procedureis attempted.
2. An ac €librator,
cnecKs.

an oscillos@F,

c. Moniroi A6TP1 r

and a dc voltmeter are required for these

3. The time shown on waveforms is @rrect for instruments designed fd
line operation. For 50 Hz instruments,incrEse time shown by 20%.

60 Hz

4. Afler repairing the AC Converter. check the owrload protedion circuits in the
following mnner:

d.

lf

Fw{sm

A6Rt4,

a. Set 34904 FUNCTION to AC, RANGE ro 1 V, SAMPLE RATE ro FAST,

e. M6ue

b. Apply inpur of'10 V at 100 Hz.

f.

;s

t5.
rclEg!

lf 6lbgabrcr(

i

Monitor A2Ol pin 3 lO

l s \
E volbge

t7 with scope (lnt. SYnc'

t€gt?

ov 1--t==-'l 6omsl.-

-r7vl

NO

Monitor A1U401 pin 17
with s@pe (lnt. Sync.
Slope).
Correct Wavelorm:

(white
retion
En A6 and 42.

-*

assdüly. Se Par. 7-14.

4V1

--l OomsF-

Troubleshoot
DC
Translaror A'1O411

Apply 1 V input at 100
on

range.

1V

AOTPI
Jumper

to
top

Jumper

46
shield
end of A6R

Monitor left end ot A6C
with scope (line sync)
Connect right end ol

to A6 shield. Monitor
lower end of AGCRl 3.
Correct waveform:

.

I kf,l to + and ,5 V. Volt.
age should be > - 15
with +5V
in, a
>+15Vwith-5Vin-

iE S

b*-$r

,

l

I

-

l

| :a-:'

dth

s@F.

Troublesh@t
and
@ch

05,

that
@nfirming
is tomard
biased by

checking
on

4604,

06.

dc wltag6

schemlic

Figwe

shown
7-29.

S@ Note 4.

Tro ub leshoot
46U3,
A602, and A603. Se
Note 4.

Corred

Mveform:

+6Vto+7V

5. lf the AC Conwrter operation is out of specitications only at certain
frequencies, refer to the bble of Frequency-Related Accuaacy problems.
6. Pin 18 indi6t6

ths rewrse &velorm-

'6Vto-7v

t--

.'=
I r,3-

!

io!

dipped ar prope

levels, troubteshoor A6CB5-12,

:: A6TP3 wirh 3@pe-Should be + 2 V to + 2.5 V.

-.:: s6,
F i

troubleshoot A6CR16-.19,A6R4O.

Figure 7-6. AC ConverterTroubleshootinsTree.

7-1s17-t6

::a
,r'ji

ta$l

- o-ata

;.ä.,

tgtEa:
l. DC dril.tütgi||tl$Fdn
t. Aß ddüCoo9..,
orwrrndrüd
3. fh.
fm

d..Grttt,

r 0

lr.fda,|3

hCc.

|ür

b

tlrt;lt
wath anD{r r.d3re.
ItdadEdc.

d ilrdo.E
- ffi
lü
üD Jwr
Fd 50 tlr iü|rmB,
iEe
op-rtion.

ogmiig

ffity

o, tolootn,.r

i.il.ufErt!
O|i$d
ünr bv 2O*.

b.tor.

I

lq d, Hr

Ficlinud@D
G
$dr.@{t
..td Ld
llar
b
S.r FiI{CTION

+ 5F.

Elm

tlup

a F?

TEST

lr-s

Fhtgo

of ]i6

14

rd 15 ot Alt}|{rt.
JFu'ldbo+5V.

Ar. Raln'

7'l
Figut.
d
T.ble
in whiS
targ[
öort
dotd
throügh 4 &
A7K5 k do..d o dl .x'
€pr tO,ülO X rüaa.

X. Y. rnd Z 6
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b.tor.

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1 t$

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of A7R22ryd
23.

Troubl..hoor
A?CRIOüa ll.

A7Ot.

Figure7-7. OhmsConverterTroubleshootingTre€.

7-r7l7-r8

- 5v (ti!

4 ! 2 |
aaaa

r-a;---l t
i
I v

wc

+ t7v (t-u w H
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+5V6-UWJ

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|
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obwx

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l

l
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a a a a a a a a a a a o a a a a

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tp

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Port No. O349O,6650r
Rev E

l"'lffio"lPl

=

l
I
1I

,.

L-+lJ:..lJ!"1#.1J,..
l#1l# | ,,,lHlf
^

A3
hp Port No.0349O-66503
REV, B

t

NOTES:
1. ll rhe 34904 has the speial annunciator display, the a$embly dBignation is
A20. All A3 @mponent dBignators alp apply to the A20 6semt lv.
2. An Gcillospe

is required for rh6e checks.

Figure7-8. DisplayTroubleshootingTree

7-t9lt-:

3
H
jd

ffi
ffi
ffi
ffi
ffi
g

a a a a a a a a a a a a o a a a

' n ^ r T _ l ^ .-.
Il

t l ',Lj,lll
l s l i l'L--l
=LJ.

---

' '
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i ti;

r.r""..........{

r.'.''......1
n
l3
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omo

9

l
i
I
I

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t-

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ä

-- -;-----i'Ta---

AI
tlp Port No. 03490,66501
Rev E

?lfo-l
::.-Joc
:r 1llsalqnora
?

,.-,lg

a
::
:::

oulpeai

]carloJu!

salFlpur

Morrvr_

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.l

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oN ls31
or slsrl bulMolloJ aL]r asn
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etqeleadar

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0,. +

J

I

I

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bzoooz +
tz000l +
2t060 0 +
tZ00 l0 +
vzoozo +
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tzo oB0+

t

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rorB
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rolerduol
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:-,o alcrlrur't 36ueU lcälaS

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ale!l!ul pue L a6ueu tralas
uaqt 'ra66tra NVW ql!M
3ldu6 €uo alelllrrl z ol
a6ueu' asfl ol uollcunl
'c_l
oH or aleu aldues ras

-parsll
sburpeäJ lo las ^ue ol l6q
-uap! are peurelqo s6u!peeJ
Molaq

ua^!6

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ol'Mol
aq] ]r aurulelap
-€q uMor]s s6ulpeal snoau
-orr€ alqrssod ]o slsll qlrM
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sbulpear

suo!rsa66ns
Mollol

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lle rou

ll

lsll o:;r--:l
:!.. iNVri

t

o-1ots.:;

F

ru*rffifc_

:

f*tEv:

Select TEST No. L Set
Sample Rate to HOLD.
Iniriare readingswith MAN
trigger and compare to list
ot @rrect readings sh@n

ll

not

recl,
with
neous

all

readings are corcompare
readings
lists of possible erroreadings

low,

to

tiel

shown

determine

readings obtained

il

bethe

are iden-

to any set ol readingE

listed.

Ser Sample Rare to HOLD,
Function to TEST. Flange
to 2. Iniriate one smple
with MAN Trigger, rhen
elect Range 1 and initiate
one $mple,

-hp- 105294, roy be used to check certain
loqic units in rhe 34904.
This instrument@mparesthe
logic
Two logic Fckages,
Fckage 1o a reterence unit of the same tvf.
AlU18and
A1U23are
low power units and €nnotbe
checked
with the Logic ComFrator.A1U4,5,and6
are mounted
ioo
close to rhe guard shield ro be checked in this way.
A Logic ComFrator,

!490A-0-2999

Y E S Select Range 3, ir

gmple then sele
and initiate one s

S€lect Range 6, initiate one
smple.
then *lect
Range
I and aniriare one €mple.

smple,
then select Range
'l
and initiate one smpte.

ls
Display
+ .oo01 68?

Check AlU15 and A1U6
with Logic ComFrator.
See Note 1 -

Check A1U15 and A1U12
with Logic ComFrator.
See Note 1 -

CheckAlUl5

and AtUt2

gs {or Test No. 1

).o24
oo24
@24
oo24
9032
oo24
t.o24
n.24
n2.4
I x x O L

It the inslrument displays a repeabble
equene of partially correct numbers in
T6t No. 1, use .the following lists to
rclate the problem.

+ Arrow

indi€tes incorect reading.

o80.024
04.oo24
o.20024
.010024
+ 0.00200
10.oo24
200.o24
4000.24
80002.4
6o00.xxOL

Troubleshoot AlUl5
Logic ComFrator-

080.024
04.oo24
o.20024
+.000168
0.09032
+ 00.0184
200.o24
4000.24
80002.4
6000.xxOL

wirh

+
+

li'r'lt'?lt;''.."it 3"t,1-\*rutor.

o80.024
M.OO24
o20024
.o10024
0.09032
ot .0024
o20.o24
040024
08002.4
@oo.xxOL

+ 800.024
+ 40.0024
+ 2.OOO24
+.100024
0.09032
10.0024
20/).o24
4000.24
8m02.4

T:!

Arur5 a Iut 1 J
t'"oresh@r
A I U6 wilh Logic Corcralor

080.024
04.oo24
0.00168
.0't0024
0.09032
10.0024
+ 000.184
4000.24
80002.4
@ 0 0 . x xO L
r

040.024
04.0024
o.20024
.010024
0.09032
10.oo24
200.o24
4000.24
80002.4
+ 0002.08/9

- o
o
.c
0

li

z
+ 0
&

Initiate 6 mre smples.
Disploy should read:
+ 0.09032
+ 10.0024
+ 200.024
+ 400024
+ 80002.4
+ 6O0O.xxOL

CheckA1U15 and A
with
Logic
Se€ Note 1 .

41U15 andAlUl

ComFralor,
See Note
1.
Also check A1U16 pin 15

ComFrator.

Displ
cotre

Check AlU21
ComFrator. S

tor Uprange or

+ 000.168
04.oo24
o20024
.o10024
0.09032
10.0024
200.024
4000.24
+ 00018,4
6000.xxOL

r

l

080.024
+ 0.40024
+ .6OO0xx
OL
+.0.80.024
+ 04002.4
600o.xxot

|
|
I
I
|
I

\--Troubl6h@ting

+

f-l

.2ooo24
0.09032
r0.0o24
t 2cf,0.24
+ 00903.2
- 10.00.2.4

|
|
|
|
|
I

f-_l

+ o.2oo24
+.010024
+ .o.2oo24
+ 01002.4
+ 6o0.0xxOL
+ 60.0oxxOL

|
|
|
I
I
I

n

+ ooe.032
4OOO.24
80002 4
+ 4o.oo.2.4
- 80oo24
- 00.s032

|
I
I
I
|
|

AlU19 and A1U2l with Logic Comparator.-------J

t: :rFrätor

Figure7-9. Lop

sai

Initiare 6 mre smples.
Displaysho(ldread:
+ 0.09032
+ 10.oo24
+ 200.024
+ 4000.24
+ 80002.4
+ 60O0.xxOL

Range

Al U21 with Logic
check AlU16 pin 15

r

l

2OoO24
0.0s032
10.oo24
+ 2cf,[24
+ 00903.2
+ 10.00.2.4

|
|
|
I
I

+

|

+ 020024
r.010024
+ .0.20024
+ 01002.4
- 600.0xxOL
- @.00xxOL

f-_l

+ 00:).032
4ooo.24
80002.4
+ 40.00.2.4
+ 800024
+ oo.9o32

Proceed

lo

Displa

Troubleshootang suq-

Check 41U21 with Logic
ComFrator. See Note l.
Also check AlU16 pin 14
Ior Uprange ourput signal.

|
|
|
|
|
|

t-r65@ting A1 Ulg and 41U21 with Logic Comparator.----J

Figure7-9. Logic Test TroubleshootingTree.
? a l
I-t

_

r r

,+

{

- 5v (t-Xr w6
+r7v(i-l)sn
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l

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a

a

a

a

a

a

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1-1" if-l'
I r l rI l r l
l r l

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,

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Tl=l
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l,p Porr No.0349O-66501
Rev E

|

.Ll

'LJ

.U

.:iili;i*iii

.n" D

i
oa

. 'ä-'äfu
"HH-n"fu----=t,'
.,; ";t'E
r11
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f..fi,il;11,;,'.6)
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fl

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!i,itldi##ig'Ll
,6es6@o9,
iilti!iFii!r:

€@CI6@@e#ffi

Connect oscillosope to
AlTPU and monitor State
Clock output. Set scopeto
Inr. Sync +Slope.
Correct waveform:

SEE NOTE t. Monitor
1 1o l A l U l 2 .

M(

Sct
po

YES + i

Monitor pin 11 ol A1U4.

SE€ NOTE 1. Monitor pins
and 7 of A1 U2.

:;[-r
l+5nsl

t'!

.o." 1-

_,;ljlYES
Monitor pin 14 oI A'lUs
Correct waveform:

E NOTE 1. Monitor pin

YES

1U4. Both pins should

NOTES:
1. To monitor waveform or voltage, first turn 34904 OFF, then while holding
MANUAL TRIGGER button detressed, turn instrument ON and m@sure the
necesgry waveform or voltage. The pushbutton must be held in while the
measurementis bken- This procedureapplies oßly to those tests which refer to
Note 1 .
2. The time shown on waveforms is correct for instruments designedlor 60 Hz
line operation. For 50 Hz instruments,increasetime by 20%.
3- An oscilloscopeis required {or these checks. Voltages ruv be m@suredwith
sufJicientaccuracvwiih an oscilloscope.

Refer to Loqic Troubleshooting suggestions in Paragraph 7-39.
34904-0 - 2$7

SEENOTE 1. Monitor
11ofAlUl2.

pin 1 of Alt-J7.
traggerto +5 V lest
on A1A1. Exr Sync,
+ Slope. Turn 3490A OFF
back ON. Voltage at
I should remain low
approx. 10oms, then

A1U19 and A1 U21
Figure 7€, Note 1.

so Hish(+ 5 v).

S E E N O T E 1 . M o n i t o rp i n s
and 7 of A1 U2

';1;:-*"*-''

A ' t 0 2 ,A 1 0 3 .

l+5 ms-l

ltrlt'tj

,o." 1*

:lll-tlYES

ot uu'
U.T:'"",'J"',l,:,t-:t
-+iO.254s

SEE NOTE '1. Monitor
3 of Al U6.
Correcl wave{orm:

-lu-lJI

F

:1"/\/-\

soms l.rI

E NOTE 1. Monitor

YES

: NOTE 1. M€sure
agesat pins 1 and 4 oI
41 U4. Both pins should be
>+2.7V.

Measurevoltage at pin 5 of
4 1 U 2 . S h o u l db e ' 1 1 V r
to%.

Re{er to Logic Troubleshooting suggestionsin PaL
agraph 7 39.

Troublesh@t ,11 V
ply, AlCR3.

:or waveform or voltage, tirst turn 3490A OFF, then while holdinq
- TRIGGER tlutton depressed,turn instrument ON and measureth!
wavetorm or volrage. The pushbution must be held in while the
€nl is taken. This procedure appliesonly to those testswhich refer to

shown on Mveforms is corred tor instrumentsdesignedfor 60 Hz
rtion. For 50 Hz instruments,incr@setime by 2O%.
oscop€ is required for these checks. Voltages mV be mesurecl with
accuracv with an oscillosco@.

sur

Replace AI U'16 wirh
known good Frt. Switch
cnges and lunctions, observang decimal poinl.
Should
correspond to
Enge.

Return to GeneralTroubleshooting Tree, Figure 7-4.

SEE NOTE 1. Monitor Din

SEE NOTE 1. M@sure
rcttage ar pin 2 ot A'U12.
Should b€ < + 0.5 V.

SEE NOTE '1. Monitor iignal at baseof A101.
Corect wave{orm:

SEE NOTE 1. Measur€
rcltage ar pin 1 of A1u6.
Shquld be > + 2.7 V.

Reter to Logic Troubleshooting suggestionsin Paragraph 7-39.
SEE NOTE 1. N/leasure
rcltage at pin 2 of 41u8.
Shouldbe>+3V.

Measure voltagB at pins 5
l0 of A1U8. Pin 5
s h o u l db e . 5 . 7 V , p i n l 0
be + 12 V. Toler-

n.fer to Logic Troubleeooting suggestions
in Par
4.a3h 7-3g.

and 7 o{ A1U8. Both pi

throuqh A1CR2, 3,

R e p l a c e4 1 C R 1 .

Figure 7-10. Logic Clock TroubleshootingTree.

7-2317-)1

,j

ltr
*1
g
S+ft$b!t}"oo.

€

-&Ug
E.E?*;f--"..--l
,r".r.l'"

F -^o-

-

sl

\f-

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l+ 1

+**o;

€

ffi

-

Ä,
hp eut No.0349O-565O2
Rev. C

ä

,l
i*l

l
l
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I
1
I
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I

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tHttttffi-

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llJtlfr.Il,l

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cllell:ll'll!
- l $||'
EB
Ii----E 'r r r r r r r l
' ?tr'|+1HHHL

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r@++@+f*****io

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1
,i "-

4

E

r

4

8

r

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ft wlf
t
7

4

8

r

4

tt u4-l
f-C-l
7
t

0

7

l
1 :
o c

H

f\--------.
f i - ,t------' - r { {| *I *| -| *| |l|
'

4

9

hp Port No.O349O-66509

f

t

l

u

f

6

8

l

K

8

t

- Rt8- R26-R30-

u

6

t- us-l

t

l

4

T

4

i

l

4

1

n n

l

v

8

i- url
B

l

T

l

1

4

I- u,-l

4

8

1

4

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/:\

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-R22-R2l-R28-

_R'_
-R6-Rr3-R5-

_RJZ_ \q, /
-R3r-Rzl-RrO-Rr2-R33-

-R2-R24-Rr7-

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Tl-ll't- l ' , .l'.

l.'l l' l l---.l"

_Rt5_ _C2_
-R7-R8-Rl4-

0000000000000000000
Alo
hp Port No. O349O-66510

COLLECTOR

U1.U6
,/t,

--ft-

FLAT SIDE
OR
coLoR ooT

rf-----lr.
t

t

t
l
lw4 |

t

l

rL_____l 8
-Rt-R2 -R3-R4 -R5-

AI5AI
h p P o r tN o . 0 3 4 9 O - 6 6 5 t 5
3490A-6-5000

-

AI5A2
AICi
Ftv

hp Port No.O349O-60306

h p e o r t N o .0 3 4 9 0 - 6 6 5 t 6

s@pe q

to

lnt

Sample

sync,

R.

AlOL
and 11. C
for

all

r2c
.:Jt
r

At(fl.St@idbe+5V1.
:','
t 5.S v.

sh(
for LC
oin 13 of AlOUl

tesl
ar in previous
sme
except High lewl is + 4 V

Troub leshoo
A I 5U5.

Monitor pin 3 of A9U3.
Correcl wave{orm:
_-]
|

b_ o.2
ms
|

;.,,\AA&

.#F

Sampte Rate to FAST
niror AIOUT pins 3;
and 11. Coiled wa
for

all

pins

I

.llj-*#ll
l._ zooms-+l
pulses
,m

should

for

LOW

be in
rrue out

pin 13 of Aloul

pin 12 of Aloul
pin I ot A10U2. Correcr

Monitor pin'l ol AgU3
Ground scope to Inpul

except

High

lewl

is + 4 V

Troubleshoot

A15A

;:,\^ÄÄ
Set Sample

Rate to FAST

f+- zoomsl

+4V i-J

Troubleshoot
Doubler, A9U3

Frequency
and AgU5

.l[-:r

ti'1::i.'::"::
i ,,
.1.1.1-:t.1

.; t-.,''

pin 3 of

I r--

';=c

::i:,i.i't

or Inguard

gro

.l[=-

-,.*--

,:i.

;;i

.

'.

.l-,"t

i-,
ea

.f,',."
ReplaceAlOU

.,:

H':-.
:'J.'l
YES

F.:;
t.:.

:_'.

Replee AgU3

!490-0-2995

-

tor pin 3 of A9UB
{
s@pe
to
Inpul
). Inguard ground.

. f=

b3mtl

,[J-lr

Figure 7-11. Data Output TroubleshootingTree, Option 021.

7-2s17-26

_
i.r
. l
aa

!

,X
i,
A

Arl

7

z

hp Port No.o349o-665t1
Rev.C

I

tn

i-,F---+r

|_-]|-;q I, i. J?

-l

t'it'
::i.

r

;
?

.,ä

ci€

a

8

ß

a

[--r-u3--l l-- u4 I
:--------j
i------i

i-------g-----+ *l +
t* I i!-u;i t
l l r l H t

#
ffi
q

.l

.: a1

#
@

ffi

U1.U6

+

g

gig

fq

K

!4$- B - !597

i . :

,ä

re**

t,E:

ä

fl

w
E

AITAI
h p P o r tN o . 0 3 4 9 0 - 6 6 5 1 7

\_

At7A2
At7

hp Port No.O349O-60308

hp PortNo. 03490-66518

Exec. input
) 5 psl.

LOW

pin ll

NOI€S :
1. Fron! pansl rang€ and function selection mu{
@rectly before thir f@dure
is attefifd
2. An osillo*or

!4901- o . 2s!

is rquired for th6e chcks.

of A1

op€rate

t l u 2 , A ' t 1 u 3 ,A r l

undionAendBHIGH)
lvbnitor

Dab

a ProFm
Exec.
)55).

inprr

No.2
{R.nge
8 LOW, A HIGH}

Flag 5igEl

pins 2.and

Er

1zL

l2U1 while apglvang

LOW

pin 6l to ground. RE

+ 5vr-r
*1o.4ßF_
ovl

+5V-

-1 =r^F

t'"'h."'-l

.:;LfLr

pin 11 of A
*r@ld be 0V when
k LOW and +3
Rem Enable

Logic circuils, At I
1U2, At1U3, Atl

bmtely

progmm TEST

Fuodion
6r

A and I
No.
2
{Range

IIGH.8 LOW,A HIGHI.
lonito. pini 2 and 14 ol

Rep€at prwious ch4k,
monitorlng pin 7 of
Al lUT sd 8. Correcr

'12U1 while applying
Em Ex@te.
ddEwfoam:

PIN 7

+{o.c'"F

rtN 2

*16t1-

OVl-r
PIN I5
l+ 0o6 msI

.::LfLr

P I NI 4
|.0o6 ms{'l

-:JL|LT

L6Vrn9

gog€h

fevioua

ch€ck.

aS

rcltagG
et
inNts
A'llUlO
.nd AllUlt
Logic l4l3
should be

A11Ul0pin7=Ld
ßin 9 = Low
pln 4 - Hlgh
pin 3 = High
411Ul1 pin 12 - bw
ßtn 5 = High
pin3!L@
pin 2 - High
Trcubl€ih@t At 1U7 and
A1IU8

+s-Y'mlovl

"'t '&.a.r'1

-ilLJ_LT

Troubleshoor

Al

Figare7-12. RemoteTroubleshooting
Tree,Option022.

7-2717-28

START

FEMOVE A4 ANO REPLACE Ag AND
436. MESURE + 12 V. + 5 V, ild -2 V
OUTGUAND VOLTAGES. +I2V
AND
.2V AEST POINTS ARE ON A32 AND
+5V TEST POINT IS ON A33. VOLT.
AGES MUST BE MESURED
TO OUT.
GUAAD GFOUND TEST POINT ON 433
OR A3O. ALLOW +/,1ü
TOLLEflANCE.

BEMOVE ASCII INGUAFD A$EMALIES
A g A N D 4 3 6 . I N S T A L L R E M O A EJ U M P ,
E F B O A F D 4 4 I S U P P L I E DW t T B O P T I O N
OSI IN CONNECIOR A1J7 IN PLACE OF
AS. SET 34SA
RANGE ANO FUNCTION TO TEST i TO VEFIFY COFFECT
O P E R A T I O NO F M A I N L O G I C .

ARE VOLTAGES CORRE

TFOUBLESHOOT
OUTGUART
+
AGE SUPLIES. +12V .d
PLIES ARE LOCAT€D ON OU
MOTHEF EOAFO A3I. .2 V SI
FROM SYSTEM
trVELOPED
MULTIVIBAATOF ON A32,

CHECK OPEAATION OF ISOLATING
PHOTO.TFANSISTOAS
U1 THAOUGH
UII WIIH A LOGIC PROAE OR AY
CONNECTING A KNOWN GOOD UNIT IN
PARALLEL WITH THE SUSPECTED
PHOTO.TRANSISTOB IN THE g9OA.
A60
CHECK DFIVE TRANSISTOFS
AM4
THROUGH
@
AND A35OI
THBOUGH 04. *
Note l.

MENURE + 12V ANO .2V SUPPLiES
q
IilGUARO ROM SEMBLY
A34.
THESE AR€ ON TEST POINTS ON A34.
MENURE TO INGUAFO GROUNO AT
EST POINTON AS,

ffi

TROUBLESHOOT SUMLIES
GUARD FOM A$EMBLY AA.

6E CAFE IN HANOLItrG ISOLATION
NEMBLIES,
PHOTO,TRANSISTOAS U 1
DROUGH !II
AAE VERY S€NSITIVE
TO MECHAtrICAL STRE$.

ilotEs:
1. THE ISOLATING PHOTO-TRANSISTOBS
U1_II MAY BE
CHECKED BY CONNECTINC A NEW PABT IN PAFAL.
L€L (ALL FOUR CONNECTIONS) WITH THE SUSPECTEO PAAT. THE NORMAL VOLTAGE OROP ACFO$
THE DIOOE POATION OF THE PHOTO.TßANSISTOF
UNIT SHOULD BE APPAOXIMATELY I-75 V WHEN THE
UNIT IS BIASED ON, ASL4_9 AND A35L1 5 ARE
FERRIT€ 8EAN.
2, EACH TIME AN SSEMALY OR PAFT ISSUBSTITUTEO
O R A R E P A I F I S M A O E , T H E O P E B A T T O NO F T H E G P I S
C I A C U I T SS H O U L O 8 E C H E C K E D U S I N G T H E P E A F O F MANCE CHECK IN PARAGRAPH 545, THE COMPLETE
CHECK MAY BE BUN, OA ONLY THAT PORTION
W H I C H T H E I N S T R U M E N TF A I L E O P R E V I O U S L Y .

3 4 9 0 - D- 3 3 8 1

F E P U C E D E F E C T I V EC O M P O N E N T .

THI
THIS CHECK A$UMES
ONE GPIBPRINTED CIFCUT
ALY IS DEFECTIVE. USINC
ELIES IN GPIB REPAIR
OAS8m.
SUBSTITUTE A$
ONE AT A TIME IN THE FO
OROEB: A32, AS. A36, A34,
LATION NS€MELIES A3O,
TOGETHER. AFTER SUS'
EACH
ASSEMBLY, PERFO
OPEFATING CH€CK GIVEN
GNAPH 5.7 OA '9 IO DETE
PROBLEM lS CLEARED,Se No

BEMOVE 44 ANO NEPLACE Ag ANO
A36. MEASURE + 12 V. + 5 V. sd .2 V
OUTGUARO VOLTAGES. +12V AND
.2V TEST POINTS AAE ON A32 AND
+5V TEST POINT IS ON A33. VOLT.
AGES MUST AE MEASURED TO OUT.
GUABO GAOUND T€ST POINT ON A33
OF A3O. ALLOW +/. 16 TOLLEAANCE,

IROUELESHOOT
OUTGUARD
VOLT.
AGE SUPPLIES.+lzv
.nd +5V sUPPLI€S ABE LOCATEO ON OUTGUAFD
MOTHEF EOAAO A3I. ,2 V SUPPLY IS
OEVELOPEO FROM SYST€M CIOCK
MULTTVIAAATOF ON A32.

CHECK OPERATION OF ISOLAIING
PHOTO.TRANSISTORS UI THFOUGH
UTI WITH A LOGIC PROBE OF BY
CONNECTItrG A KNdN
GOOD UNIT IN
PABALLEL
WITH THE SUSPECTED
PHOTO.TNANSISTOR IN THE 3$A.
A5O
CHECK ORIVE TRANSISTOFS
A@
AHFOUGH
@
ANO A35O1
THBOUGH 04.Se Note l.

Hffi3
CAAE II HAXOLING ISOLATION
6E
SEüBIIES.
PHOTO.TAAilSISTOAS U1
üBOUGH
Ul' ARE VEFY SENTIVE
TOTEqAXICAL
STßES.

ANE ISOLATION CIRCUIE
TING CORFECTLY?

OPERA-

THIS CHECK SUMES
THAI ONLY
ONE GPIBPRINTEO CIRCUIT AS€UaLY 15 OEFEqIVE.6rNG
A$€M.
BLIES IN GPIB REPAIR KIT NO.
OSS.A(rc,
SUSSTITUIE A$EMALIES
ON€ AT A TIME IN THE FOLLOWING
OROEF: A32, A3, A36. A34. AND ISOLATION SEMBLIES
AS
ANO A35
TOGETHEA. AFTER SUBSTITUTING
EACH
ASSEMBLY, PERFORM THE
OPERATING CHECK GIVEN IN PARA.
G A A P H 5 . 7 O R ' 9 T O O E T E R M T N EI F
PROBLEMIS CLEAAED.Se Note 2,

USE APPROPAIATE R
NOTEO IN THE FOLLO
REPAIR OEFECTiVES

PROELEM MAY AE ON OUTGUAAD
MOTHER BOAFO A3i OR IN A$It AUS.
SUBSTITUTE NEW 'AFE
{KIT NO.
ogw@31)
FoB a3ru2 aND 3. TH|S
CHECKS OATA ANO CdTNOL
LINE
BUFFERS ANO GATES. Se Note 2.

rcES

iE
L.

sF
B
IE

o
a
tE
N

3490-D - 338r

ASCII OPERATE COFRECTLY?

r'AT€ REPAIF KIT AS
E FOLLOWINGSTEß TO
- VE ASEMELY,

8 U N C O M P L E T EO P E F A T I N G C H E C K I N
PAFAGFAPH 5.45 TO VERIFY PERFOF.

IF ISOLATION S€MALY
AS ANO A35
15 DEFECTIVE, GE NEPAIR KIT NO.
OSS@I3
TO NEPAIB 8Y R€PLAC.
ING DEFECTIVECOMPONENT{SI.

IF INGUAFO PFOGRAM ASEMSLY AS
IS OEFECTIVE, USE REPAIR KtT NO.
@96@5
IO FEPAIR AY BEPLACI N G D E F E C T I V EC O M P O N E N T { S I .

CONNECT LEOP LINE AT REAR PANEL
@NNECIOR TO GFOUNO U12 PIN 9
TO PIN 24I ANO MONIIOR LFST AT
COLLECTOF OF A3M1. LRST SHOULO
B E L O W W H € N L E O PI S L O W .

CHECK INVEATEF AWg
PINS 8 ANO
9, AND INGUAFD INVEATER 435U3
P I N SA A N O 9 .

IFOUALESHOOT
RESET CIBCUIT,
AMl
3 AND ASU4 PINS 3 AND 4.
IF OUTGUABO OATA ASEMELY A33 IS
D€FECTIVE, SE
REPAIR KIT NO.
OS9OAMS
TO AEPAIR AY REPLAC
I N G D E F E C T I V EC O M P O N E N T I S } .

IF INGUAFD FOM A$EMALY Ag IS
OEFECTIVE, USE AEPAIA KIT NO0349O,AOO34 AN D F€PLACE ALL
M I C B O C I B C U I T SE X C E P T F O M - A 3 4 U 5 ,

I S P R O B L E MC O R S E C T E O ?

IF OUTGUARD ROM A$EMBLY A32 I5
OEFECTIVE. US€ REPAIß KIT NO.
03490.80032
AN D REPLACE ALL
MICROCIRCUIre EXCEPT TWO AOMS
432U2 ANO 3.

RUN COMPLEIE OPERATINGCHECK IN
P A R A G R A P H 5 { 5 T O V E R T F YP E F F O F .
MANCE.

FEPLACE FOMA32U2.fu

F U N C O M P L € T EO P E F A T I N G C H € C K I N
PANAGRAPB '45 TO VENIFY PERFdR,,
MANCE.

N O t €2 ,

crYYYYrrrFr

l cauil oN.l
ROM AßD MOS DEVICES AR€ EASILY
DESTBOYED
BY SIATIC
CHARGE.
KEEP PINS SHORTEO WITH CONDUC.
TIVE FOAM OA METAL fOIL WHEN
PART IS NOT IN If,STAUMENT.

REPLACE A32U3. IF THIS CORBECTS
PNOBLEM, BEPLACE A32U2 WITH OFI.
GINAL PAßT. IF OPEFATION IS CORR E C T ,S E E N O T E 2 .

Figure7-13. GPIBI/O Troubleshooting
Tree,Option030.
7-2917-30

.-.;l

@ä
+tr++o

+w*+il
[l+@ r ö
't'*,
T

(6äl

+fr;+tqT
llllllllll

*üü**ä

TTTTTT
hp

Porl No. 0349O-66527
Rev. B

l6|-------19
|
,,c

|

""

----d
16

ut4

lllillill
A28
Port No. 03490-66528
Rev.C

I

16

9

I f-------t

,l

s 'öl--.le

,. l"

[t - o ]l l u . ' I
.r______ä,"1,,"_1"

SET SVH SYVITCH TO IRACK/HOLO.
FUNCTION TO OC. RANGE TO lOV,
A27KI SHOULO 8€ CLOSED.SET SAM.
PLE FATE FULLY CLOCKWISE.APPLY
10 Vdc INPt T.

II'ITH SAMPLE/HOLD SWITCH SET TO
OFF, VERIFY PFOPEROC VOLTH€TER
OPCRATIOITIOF 34SOA.

FULLf,AI{(
YES APPLY
RANGES IN BOTH

ACOUIRE/HOLDOP

CHECK VOLTAGE AT PIN .I NEAR TOP
CENTER OF A27, SHOULO BE NEAR
ZERO. CHECK WAVEFORMSAT PINS 2
ANO 3 II{ SAME LOCATIOI{. EXTER.
NALLY TRIGGER SCOPE ON TEST
FOTNTK IN LOGIC S€CTIONOF 3ISOA
MAIN CIRCUIT BOARD.SHOULDB€:
PtN2
HHDA

I

U

AnE VOLTAGE /
CORRECN

+45 V
L-OV

nf-l- üi'"

s€T s/H siltTcH 70 tRAcK/HoLo
oR
ACOUIAE/HOLD.SELECTTOV RANGE.
AP?LY lovdc INFUT. SET SATPLE
RATE FULLY CLOCKYVISE.AZ'K1
SH(ruLD BE CLOSEO.

TROUALESHOOT/
ctRcutß tN A2tut

REMOVE A27 AND A28. REPLACEWIB
I'MP€R EOAROS A24 ANO A25. SET
S/H SWITCHTO OFF. CH€CK DC OPER.
ATION.

NOTE
ALL IIMES SHOITT{APPLY TO OPTION
0d) INSTRUMENTS(6OHz LlilE). FOR
OPTIONO5O,INCREASETIMES BY 20 i.

It{G @R-

SET S/H SAYITCH TO TFACK/HOLD,
FUNCTION TO DC, RAilGE ?O lOV.
A2'K1 SHOTJLO8E CLOSEO.SET SAMPLE RATE FULLY CLOCKS'ISE.APPLY
10 v& tNruT-

FULLAANGE INR T Ot'l ALL
MLY
RANGES IN SOTH TRACK/HOLD ANO
ACOUIRE/HOLOOPERATION'

CHECK VOLTAGE AT PIN ' NEAN TOP
CENTER OF A2'. SHOULO SE NEAR
ZERO. CH€CK WAVEFORiilI AT PINS 2
AND 3 IN SATE U)CA?ION. EXTER.
NALLY TRIGGEB SCOF€ Oil T€ST
?otNT x tN Loctc sEcTtoN oF 3!90A
MAIN CIRC-I'IT8OAFO. SHOULOAE:

.l

U

Lov

PtN3
HHoE

J

ll

+45 V
L_ 0V

PUTSOF r V.3V,6 V,7 V A

SET S/H S:II,ITCHOFF, SAMPLE RA?E
FULLY CLOCKWISE, RANGE IO 1 V.
SHORT II{PUT TERMINAI.s. Cor{ilECT
TEST POINT LTST ON A28 TO INGUARD
GROUND. THEN SET 6VH S1INTCHTO
TRACK/HOLD OR ACOUIRE/HOI'.
ffECK VOLTAGEAT A27TPI.

+45 V

PtN2
HHoA

IOV RANGE. TF
Y E S SELECT
CHECK IINEARIW 8Y A'

IS VOLTAGE OßIFTING T(
lOmV/.?

VOLTAGE LESS TH/
i 12 V ANO DRIFTII{G I

TROUBLESHOOTAIPUFI€
rn,@t.

SET S/H SIVITCH TO TRACK.IHOLO OR
ACOUIRE/HOLD. S€L€CT l0 V RAtrlGE.
APPLY tovdc lNPUt. S€T SAPLE
RATE
FULLY CLOCKITIS€. A27KI
sltoulD
8€ cLosEo.

TROUEL€sHOOT A27X2 ANO ORIVE
ctRcutTs tN A27Ut0.

SET S/H SiWIYCH TO ol
tvavEFonMs aTP|l{s t,2 l
EXTERNALLY TRIGGER
TEST POINT K IN LOGIC S
3,l9OAMAIN CIRCUIT BOAR
SHOULOgE:
PIN 2
HMOA
PIN I
HMDS

REMOVE A27 ANO A2A. REPLACEIVIIH
JUMP€R AOARDS A24 AND A25. SET
S/H SI\'ITCHTO OFF. CHECKOC OPERATION.

PIN 3
HMOC

.F;t

F;;L

Jha^

F*;l__

IF WAVEFORMS ARE NOT
A28UT4IS PROSASLYDEFE

T A27, A?a. MAKC SURETO
CABLESCORRECTLY.GO TO

'E
AFPLY TO OPNOß
(@Hz UN€l. FOR
ASE nilES BY m *"

M

YGE

CHECK FErS azot, 02 Aito o:t FoR
LEAKAGE. ATSO CHECK A27C9 ANO
CIO FOR LEAKAGE.

THAN

Iiü
I
'NG
LESS THAN

CHECKVOLTAGEAT A27TP2,

NO
CHECK FETS A2706, 07 ANO 09 FOR
LEAKAGE.ALSO CHECK A27CI2 AND
C18FOR LEASG€.

.

oft-".*l

tr 2uo30FJ5, l
EB
SCe€
ON I
EC S€frtOil OF I
f mO, + SLOPE.

I 12 V ANO

ORIFTING

L€SS THAN

REMOVEGROU]IDOONIITECTIOI{
FROM
LTST. WITH INPUT SHORTEO. SELCCT
IO V RMGE, SET SAi'PLE RATE TO
HOLD. M€ASURE VOLTAGE AT
N7P3.

IS VOLTAG€ T{EARZERO?

I

I

r _ lI
L _ l

TROUALESHOOT
AMPLIFI€R B
u6, 06, o?t.

: rrOT CORRECT,I

o€FEnrvE.

I

ISVOLTAGE TIEARZERO?

TROUELESHOOTOFFS€T AMPLIFIER
^no
AssocrarEo
@MPG

i:l*o

5490- D-3437

Figure7-14. Sample/HoldGeneralTroubleshooting
Tree.

't3t17-32

--

ti

TO A2
LEXE

hp

Fort No. 03490-66527
Rev.B

l€f---19

l " l H ,.

i---i,l
t6

[l-]

ut4

Itlllllilt iltf il I
A28
Port No. O349O-66528
Rev. C

|
]-ä
t6

L

9,öl--19

1 , , ' rIe

| rr
lsr-le
e

I
t

ul6

|
t

8Ap|-crt{ot

sET s/H slriilH to acoutRE/lrolD
Ar{D toa{ron a IE PotftT a5

aw|rcH To rR^cx/

HOLO, TAXPLE RATE TO IOI.D.
O?€FATE FhOX A1{ EXIERI{AL TRIG.

aE rH€ iar|E €xcE7t
Fon oELAy
ADDEO AT BEGIIIilI]IG OF TRAC€ IE.
IORE SIGI{AL G()€S HIGH.

gtt FcE. t|(tt|Toa wAv€Foau

IHHOA' AT RED ffRE, ?II{ 2, '{EAR
IOP C€I{TER OF A27, EXTEFNATLY
TRIGGCR 8CO?€ Oil TEOATIVEGdMT
EOGE OF .AIPLI'HOU)
TRIGGCR !G.

:

l

lO V Rilc - t28a r
t.v Rilc -El2,6f
-l VRlfG-2oaaF

tilru?. xrav.EFoau 810uu) aE:

;,t:r.1i

'i+
:l:?ll
'lf

TOilITOR WAVEFORI AT AztIJi' NiI
I l. SlrOUr-O 0€ 26atkH: glr^hE
yyAVE
r1{ oPttolt
t 60 tI8TRUCCt{ß263 klL tll (t?tot{ co

lrot{tToi
lojltot

TROUELE IS 'ROSAALY IT{Ä'8I,9, 8UT
aNY c|RCt IT USll{G H8t{C @UU' rE
IOADIilG THIS SIGilAL UNE.

TOTE
ALL flrES SI|oü,'{ Ar?lY TO O?TtOl{
OdD INEIRUilEIITS Iü) Ht UXEI. FOfi
oPTtoit 60, ncnEAsE nil€ 8Y 20t

TYAVEFORI At A28Ura Pill
u) 8c sA[E AS |N PnEvlous

TRq'8LE |8 PNOEAELY
IT A28UI2,I,l.
on ut3 iltcHT 8E tOAOtilc THIS9c.
NAL LIl{E.

SgT S'H I|S'ITICH TO OFF, RAI{GE TO
IO V. SAIT?LE RATE FULLY CL@X.
TVI8E. OISOONI{ECT EX'ERilAL TRIG.
GER. I{OI{ITOR ü'AVEFONil3 AT NilS
I, 2 AiIO 3 OF J5. €XIERNALLV TFIG
GER SCOP€Oil TEST FOINI K It{ LOGIC
S€CTION OF 3'l9OA llAll{
CnCUIT
EOARD, + SLO'E. S}|o{,LO AE:

üET .srH tuttrcH io AcoulRE/HoLD
ailo xoilrToa 8Af,E FolilT As lN
A}('(,LO
?REVIOI,'3T€8T.WAVEFORT
.!E:?HE tAIE'EXCEP? FORD€LAY
Itro€D At.gEGr{für{G oF TRACEgEFgiEsrg{ LGOCSHIGH.

rävnG.ii;r

I YFIG-6!2.0r
,t vFl{G:20a8f

FECHECKSYTPTOT
nnE OF l,lALFUl{C

l,ffi.f-L_
TRouaLEsltoorA28ufi. ur3AilD ut6
'{EIVPART.
6Y SUISTITUTING

'JüJ,
F

4FEm

_

#s F,;E_

GROI'TO PIN 13 OF A28U3. TEASJRE
VOLTAG€ AT PINS 1I, 12 ANO 13 OF
A28U2. ALL 3 P|NS SI|OULO g€ LO|Y
t<+ 0, v),

ARE LOGIC IEV

REPLAC€ A26U3 O
uFo?t wt{lct{ stcia,

TONITOfi ITAVEFORI' AT A28U8 PIiI 9.
SHOULOB€:

t(iüToH MVEFORI| AT A2Arr4Ail
to;tllolraD rE sArE as n tnEvDrrt

t!-3I;

Fr3fra_

TFOi Bt.E ls PROEAaLY lt{ A28Ut2. t il
OR UI3 |,IGXT BE LOAO|I'G THIS 3G.
l|AL Ut{€.

uot{tToR yYAvEFol
3 AND t3- AOTH Sr
TO:
i.P65ü<

AR€ WAVEFOq

uoillToR
wAvEF
P|NS t3 A1{O 17, E
TO THOSE O88ER!
130F Ar8U6.

^FLV ro iztnifl.
aolts ur{Et;Foa

fi*''r*
'
: , , ; ' ) : 1 1" ' . : '

YTFTOTISAilD VERIFY NA.
ALFUNCTION.

MONITOR VOLTAGE AT A2ATN PIN 15
U'HIL€ CI{ANGING S/H STIITCH FROil
OFF TO TRACK/HOLD.

\24U3 OR tjl|, OEPENDII{G
>r srcral
ts r{@RREcT.

OO€S VOLTAGE CHATGE WHEX
S{UITCHFOSITIOTIS CHAiIGED?

A28U2 IS PROBABLYDEFECTIVE.

A28U:l PtN r3 GFOUT{D€D.mot{tTOR VOLTAGEAT A2ATß PIiI 16 WHILE
S/H SIYITCH FROT OFF TO

DO€s VOLTAGE CHANG€ WHEf{
SIVITCHPOSITION CHANGES?

iTOI{ITOR VOLTAGCS AT PINS II AND
I3 OF A28UTOWHILE REPEAT|TGIHE
TUTOPREVIOTJSTESTS.

IAVEFORMSAT A28U6 PIilS
FTH SHOULO BE SIMILAR
a28t 8 ls PnoEaaLY o€FEcTtvE.

;AVEFORMS AT A28UI4
F I7. SHOULD BE SIiIILAR
o€s€RvEo AT P|NS 3 AltO

Ä

REPLACE A28UIO OR UI6 AS INDI.
CAT€D BY IN@RRECT YYAV€FORI'AI
A'BIJ6.

3490- 0- 3456

Tree.
Figure7-15. Sample/Hold
LogicTroubleshooting

73317-34

hp Pott No. O349O- 66513

Remow A13U3, Set RATIO $itch to EXT REF
10 V. Ois@nnect dc standard from INPUT and connet to EXT REF lermMonitor wltag€ at A13
test poinr C whil€ applying
EXT REF wltages below:

Select Test 4. Set RATIO
switch-- to
INT REF.
Conn4t
dc shndard to
INPUT
terminali and
apply - 10.0000 V. Display
sbould b€ + (x).9995 I {'lO
counts + dc atandard
qrorl.

EXT REF
TPC
+20V +13.6ro+14.3V
,20V - 13.6to- t4.3V
With @nditions sme as
previous test, ch4k logic
lewls 6 follows:
T6t Point
Lowl
D
LOW
U5 pin 12
HlcH
U5 pin 11
HtcH
lNote 2l

NOTES
l. A dc standard and a dc wltreter
are required for these check;.
2. Logic HIGH=+2.4V ro 15V
Logic Low = 0 to + 0.6 V
3. Perform Ratio Adiustment Procedure after @mpleting repairs.

54904-D-loaa

Replace A13l
Dis@nned
from EXT R
net ro lNPt
Apply - 10.00
TEST 4. Shc
tqmimls. Wil
rO EXT REF
should be 0O.

Refer to Gdffal Trouble*r@ling Tree, Fig.7.4,
min 34904 man@1.

Ch*k
Input
Prot@tion
Circuit A13cRt-4,
A13Fl1-3. Afrer rep6ir, go
to next step.

Remov€ 413U3. Set FIATIO sitch to EXT REF
l0V. Disconnect dc atandard from INPUT and @6net to EXT REF t6m.
Monitor voltage 4 Al3
t6t point C whils applying
EXT REF bltäges below:

Replace A13U3 in $cker,
Disconned
dc sbndard
from EXT REF and connEt to INPUT terminals.
Apply - 10.0000 V. Select
TEST 4. Short EXT REF
tfrmiEls. With RATIO set
to EXT REF 10 V, display
should be 00.0000 t.

EXT REF
TPC
+ 20 V + '13.6to + 14.3 V
- 2 0 V - 1 3 . 6t o - 1 4 . 3 V

Refer to G6eäl Troubles*rooting Tree, Fig.7.4,
min 34904 man@l-

Chrck
Inpur Prottrtion
Circuit Al3CRl-4,
A13Fl1-3. Aft* rep6ir, go
to nexl step.

Perform
Ratio Adjustren$, Parag.aph 5-79.

Disonnect front penel 6ble W8 fJom Ratio Asembly 413. Ground pin 2 of
l E @nnector on A'13. Remve 413U2. Connect dc
sbndard to A13TPC and
monitor voltage at @thode
ol Al3CR6 while applying
|to v:
TPC
A13CR6
+10V +l2.9to+14.3V
- 10 V - 12.9 to - '14.3V

YES

Wirh €ble W8 dis@nnected, pin 2 of c
grourded, and U2 removed, set FUNCTIO
FANGE to 1o V. Apply any INPUT vol
polaritv lhown b€low, and apply t 10!
c'heckinglogic lewls as sh@n: (Note 2,

I N P U T TPC
+
f t0v
+ 1 0v
- 1 0v
-10v
+
Check A13CR6,7 and replace if deffttiw- lf diodes
a.e good, replace Al3U1
with new Frt. After reparr, go to next step.

TPD
LOW
LOW
HIGH
HIGH

u5{121
HIGH
LOW
LOW
HIGH

Ralio Adjustr4rap6 5-79.

lc W8 disconnected, pin 2 oi connetor
, ard U2 removed.set FUNCTION ro DC,
to 10 V. Apply any INPUT voltag€ with
h*n
below, and apply I l0 V to TPC.
bgaclevelsa! sh@n: lNote 2l

TPC
. 1 0v
+l0v
1 0v
-10v

TPD
LOW
LOW
HIGH
HIGH

U5(12)
HIGH
LOW
LOW
HIGH

Monitor rcltage at W8 conn*tor pin 5 while-spplying+and-loV
at'TPA.
Voltage at pin 5 should
be+l0V
and-10V respectiwly,

HIGH
LOW
HIGH
LOW

Replace A13u4 or 5 as
prwious
indicated
by
checka. Atter reFir, go to
next step.

nedq pin 13 while applying + ahd - 10 v .l TPA.
Volhge il pin 13 should
be+1V and-1V r6p4tiwlv.

Check 413U3 by subsrituting a ntu p6n. Ale
cl€ck A13R9,tO arld feedback cirdit A13R13 thru
16.

Check Al3Bl 1A,8
dd Al3R12,

Monitor rclbga at W8 @nnedor pin 13 while applying + .nd - 10 V at TPA.
Voltage d pin 13 .hould
be+1V and-l V r6pctiwly.

Replac€ Al3U2 in socker.
Monitor wltage at pin 1 of
W8 @nectff
whi[6 applying+and- 10V at pin 2.
pin
Voltage at
1 should
b€ + 10 V arü- l0 V respoctiwly-

Chsk BATIO ilitch
laqts and wiring,

@n-

A13U3 by substipan. Als
r 'e
1 389,10 ard feedoh A'l3B13 thru

Figure7-16. Ratio TroubleshootingTree.

't-35

A8
A12
A10
A17

A22
A15
A9
A 11

A13
or
426
A3

A36
A34
A35
U1
A30

A33
AS2
A31

Rearof Instrument

Figure7-17. Location of Assemblies.

7-36

:?

r€
d
ral

r:ä
#

.:..4

']ri*

i3
ä

#l
1:.i11
.111

n

Assembly

Description

A1

Main Circuit Assembly

A2
A3
A4
A5
A6
A7
A8
A9
A10
All
A12
A13
415
A17
A22
A24
425
A26
427
428
A29
A30
A31
A32
A33
A34
A35
A36
A37

H i g h l m p e d a n c eA s s e m b l y
Display Assembly
Remote Jumper Board
Range Switch Assembly
AC Converter Assembly
Ohms Converter Assembly
Outguard Power Supply
Inguard Data Output Assembly
Outguard Data Output AssemblY
Inguard Remote Assembly
outguard Remote Assembly
R a t i o R e fe r e n c eA s s e m b l y
Data Output lsolation Assemblv
Remote I solation Assembly
Trigger lsolation Assembly
Sample/HoldAnalog Jumper Board
Sample/Hold Logic JumPer Board
Ratio Jumper Board
Sample/HoldAnalog Assembly
Sample/Hold Logic Assembly
OutguardSample/Hold Power Supply
GPIB Outguard lsolation AssemblY
GPlE Outguard Mother Board
Outguard ROM AssemblY
Outguard Data Assembly
Inguard ROM Assembly
GPIB Inguard lsolation Assembly
Inguard Program Assembly
Sample/Hold Trigger Gate Assembly

t

J

}3
Fg

rä

':€

1l

1
.-]

,J

F i g u r eN o .
7-20
7 -21
7-22
7-23
7-24
7-25
7-26
7-20
7-27
none
7-28
7-29
7-30
7-26
7-32
7-32
7 -33
7-33
7-22
7-32
7-33
7 -31
none
none
none
7-g
7-35
7-3'1
7-38
740
7-39
7-39
7-31
7-38
7-37
7 -31

|

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I' i;E E r-----\
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I cro5 ll cr@ ll croT I

I r-:l

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/

::
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FT$Tfr.^

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i t ; i

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AI
lrp Port No. 0349O.66501
Rev F

I g
wEE
_.:;R

INPUT
H|GH>Low>
GUARO
>--

-.l

V

O SIGNAL
EXI REF
H|GH >--\

rowh
V

tR429 |
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m
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Figure 7-18. 3490A Block Diagram.

737

R E F EBETTCE
DESIöTATIOtIS
ASSEMALY
REFERENCE
OESIGNArION

ÄSSEA,'BLY
ÄSS€MALY
PART NUMBER
NAME UNCLUDES
A2AI SUBASSEMELY)

DENOTES SIGNAL

--i<<+---<

SUEASSEMALY
OF A2
DESTGNArOR
tS A2At)
///(CoMPLETE

? INDICATES
XAz AND PI

AI

oscIexoro:cxoeeen

l
qlR_E9OLOR:COLOR
COOEtS fHE SAME
As rHE REstsroacoLoRcoDE. FtRSr -

L"^f,T
Ff,
3^i,',fP?fä,
3:'^'l
3
WüE:,Ä',li
T_AEIH.IRDtNDtcarEstne uaanöwea
srRt p. (e?3, D€Nor
es wurt aeot vtl wine)

re2

DEST6NATOR lS A2R4

,.v.cOMPLEfE

\

--

R437
|5 0 K

R439
4.7K

K
t2. il

raF
c
2

sPAcE
t

,zl-----_l:
,ä,

}7

"tär;;

'Y

'Y,

| /'BLANK

l o zt r ^ z ^l

.r 4 < ö t

AMPLIFIER
OUTPUT

TO
INTEGRATOR
R207
4
N O T ES ,
I. JUMPER IS REMOVEDIF SAMPLE/HOLD
OPTION IS INSTALLED.
2.R429 LOCATED NEAR REAR OF INSTRUIVENT
A N D A C C E S S I B L E T H R O U G HR E A R P A N E L . "
3 . W I L O C A T E DO N A I A I
4 . V O L I A G E S w l T H l N A l \ , l P L l F l E RM E A S U R E D
WITH INPUT SHORTED,IOV DC RANGE,
SAMPLE RATE TO HOLD.
5. IF SAMPLE/HOLD IS

INSTALLED, R5II

IS

BY A
6. IF THE U2 DATE CODE IS PRECEDED
L5N
NUMEER
S Y M B O L( * ) , A N E X T E R N A 7
PART NO.0698-3380 lS REQUIRED
RESTSToR,
I N S E R I E SW I T H U 2 P I N 2 9 .

$E?
O.lV

yt)""

Z

ON A2 PC LAYOUT TH|S PAGE, lF THE SAI\,IPLE,/
HOLD OPTION IS INSTALLED, JUMPERW9 IS
REI\,IOVED.THE SHIELDED CABLE FROM SAMPLE/

HoLDBoaRo(A27)coNNEcrsro rHEsE

TERMINALS; BLACK LEAD TO LEFT TERMINAL'
WHITE LEAD TO RIGHT TERMINAL.
X CO GAIN L
4A? 16)

S. EOOTSTRAP CONNECTION IS WHITE WIRE FROM
A2U2 PIN I3.
$

CONNECTIONTO O REF AND AC OUT IS AS
FOLLOWS.O REF.WHITE HEAT SHRINK LEAD.
AC OUT.BLACKHEAT SHRINK LEAD.

I O . I F R E A D I N GI N O H M S I S L O W . C H E C K K 4 O 2
FOR SHORTING.
il. oEFECTTVE0505-8, lO A ll MAY CAUSE
OVERLOADSIGNALOR POLARIIY TURNOV€R
READINGS.
I 2 . I F O . I V R A N G E I S N O I S Y C H E C KR 5 1 6 . R 5 1 7 . Q 5 O 9

a cR5r9.

.,OFF.'
MUS1BE AT -zOV IN IHE
CONDITION
IA FET,.T''
OR POLARITY
IURNOVER
A T F U L L S C A L EA N O
Z E R OV O L T SW t L L E X I S T .

3

Figure 7-20. SchematicDiagram, DC Amplifier and
SwitchingCircuits, Al , y'^2.

7-391740

$rs*$roffia
C I -A

ry@ü@
#srynsfriW

äafr il:$^onibD
"H"
t"'v,i *,i,r,+*nu
f+fry$ry++
F:
p"@
..(ä#

c?o7
c?0f

f-

AI
,lp Port No. 0349O-66501
Rev E

ät:äsa^FÄ
l^s H

e$$8+fE+
t
Ff

qff"
HF+qSe4
'.Y 6ö
Y
*@$@
.ö
,ä{.
i , * , *F-8q/"i.,@E
..pp'z: i iq * , i n
Ot

@I r
9 f s\€9y
@
":9"i

**H++

,{9.+*+pc+++
czo1

AI
,tp Port No. 0349O-66501
Rev. F

I-R-r lr 5. F
-llr r B l l - l
ldl

l"l
L_J
a

P
t
D

P

l
9

w5 \r,€
a

D O T I N D I C A T E S P O W E RS U P P L Y
END OF JUMPER

A IA I
h p P o r tN o . 0 3 4 9 O - 6 6 5 2 1

a

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w8
o

( oY3 4 s o - 6 6 5 0 r )
M A r Nc r R c u rars s E M B L
lp/0 Al I
l
|
I
|

I

W

w
z
----a-r-r| +:ov

+rov

| -3ov

-3ov

A

A

----d+-b-

W5 NorEr

FRoM |

-sv---<*-l---5v

SueeLv |

+rzV ----d-tr-Ew7
+5V -----d-r-b-w8
_tZV ___-<--b_

POTVER
<

INTEGRATOR

W6

+tzv
c203
o.33

+5v
_tZV

3,t7
FROM DC AMP OR
SAMPLE/IOLO

7
(HCES)SERIESSW H
FROMAI U9 (I2)

c2to
3.3oF
NOTE:
I . A I R 2 I O , A I R 2 2 5 , A I R 2 2 8 . T E S T P O I N T SA , 8 . A N D
J U M P E R S I V 5 - W 8 L O C A T E DO N A I A I .
2.R2O7 IS 84O5K iN OPTION 060 INSTRUMENTS:
looK tN oPltot{ o50.
3.IF NOISYON FULLSCAI-ER€ADINGSITI DC MODE.
CHECK R207, 0206, rj20r,0207, AND U202.
4.O2O9 IS VERY NOISY IF PINCH.OFF VOLTAGE IS
NOT CORRECT. SEE PARAGRAPIT
7.3I.
s.IFTHERE rS NOISEAT LOW INPUT LEVELS (i.,lOOmV
INPUT ON IOV OC RANGE} CHECK FOR OEFECTIVEC2O7.
?' (HMT8) AUTO ZERO L
F R O MU i l { 5 )

t

l

I

I

I

=--

.t
ZERODETECT

NOTE I

ffi

l,

JSTE

I

\,*,"

,A?fli
-t7v

R2l7
too

ffi
-t7v

cR202

T U RN O V ER

p

4

Figure7-21. SchematicDiagram,Integrator and Zero
Detect Circuits.Al .

1411742

rtr
l ; l

t-T" l

r\
l ; l

t"l
*r
."-DE6rr-----l

r.rblhb-l"- - -:-,1
. ; : t

AI
äp Porr No.0349o-66501
Rev E

a
-5V

t-F@
lLJF l

a
+5V

a
+r7V

a
-r7V

a
+30V

B.
a

a

D

w2

w3

h-,,dn

- .3 o vI Faq
l_l

l"l

B E ]

. GNO
a

o

P P P
s b b

?

a
A

w4

-

P
t

P
t

Pt

b \
W5
a

D \ f \
u/6 W7
a

Pt
'
wB
a .

D O T I N O I C A T E S P O W E RS U P P L Y
END OF JUMPER

A IA I

3490A-B- 29A!

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TTfn0000000000
hp PortNo.03490- 665t3

M A r N C T R C U TATS S E T V B (L0y3 4 9 0 - 6 6 5 0 r )

RATIO REFERENCE ASSEMBLY OPTION O8O (O349O.66513)
I

N O T EI

wr I
+sv---------.

wl notl
FR.M
I
-l7v ------d b---l7V
9 PowER i
SUPPLY
w 4 N o r EI
I
| +sov ---=J*-b-+Jov
L

tt

t2 l
Ltf
2
""Z?-Jl

(

F

8\4{
7

B

6

'

(LDFC)
RATIO L TO
DATA OUTPUT

To u3ol (4)

t5

lo

c30l
o.l

R3o7

NOTESI
I . R 3 I I . R 3 2 O .A N DJ U M P E RW
S I-W4
LOCATED
ON AIAI.
2 . J U M P E RW I R E S W N - W O A R E R E M O V E D
IF
R A T I OO P T I O NI S I N S T A L L E D .P R I N T E D
C I R C U I TB O A R D , - h p -P A R TN O .O 3 4 9 O - 6 6 5 2 6
S U P P L I E DW I T H R A T I OO P T I O NM
. U S TB E
INSERTED
I N J 6 T O M A K E T H E S EC O N N E C T I O N S
I N O R D E RT O O P E R A T EI N S T R U M E NW
T ITH
R A T I OA S S E M S L YR E M O V E D .
3 . + R E F . + R E F S E N S E .A N D I N P U TT O I N V E R T I N G
A M P A L L C O N N E CTTO S A M EP O I N TO N A 2 ( A 2 U 2 P I N z O L
4. tF rT ts NECESSARY
TO REPLACEOCR3OI,R3O6,30S,3rO,
3 I 3 , 3 I 4 , A N D 3 I 5 M U S T A L S O B E R E P L A C E DT
. HESE
MATCHEDRESISTORS
ARE SUPPLIEDWITH THE
REPLACEMENT
REFERENCE
OCR3OI.
5.

I F U I I S N O I S YR
, EADINGS
W I L L 8 E O U TO F
TOL€RANCEAT THE LOW END.

6.

I F R A T I O B O A R DI S P U T T I N GR E A D I N GI N T O
REPLACEU5.
OVERLOAD,

copy R ,GHT | 97 2 By H EwL ETT - pa-cxm-oTrplnv-

+R

I

+ | / v ro R3Or, u3ot(7)

+ t7v

R E F E R E N CP
E O L A R I T YL O G I C
:

D

AMPLIFIER

+ REF INPUI
INPU'T

/^"'i;;'
\y

\y

+REFERENCE
SUPPLY

wo
NOTE

R3t6
to.oK

INVERTING
AMPLIFIER
F

R3r7
20

NOTEI

a
I

-REF

- REF

R 3t 3
2.662K
R3t4*
200

INPUTT
FROIVJ

+REFS
FROI\4
JI

R3t5+
50

Figr

R E F E R E N CP
EO L A R I T YL O C I C

: FOR INT
LOW FOR + REF INPUT

-t

(HRAP)
R A T | OP O L T O A t U 4 0 t( 2 7 ) 8
T H R US , / HO P T I O NI 8

J6
I

cR8
4.75V

I
w8

WN NOTE2
( HI NP )
INPUT POL FROM AIU22(8J 7
HIGH FOR + INPUT
LOW FOR - INPUT

|

- l l
---------r6

AI U30
a t 3 u t -4
a

,'^'.
-.\-/.-

{ T O PV r E W )

\Z

\Y

K - 9

INVERTING
AMPLIFIER

,

I u3o! ->---t-

io':l-.1*1'

R

*5#3

- R E Fr o J r ( L )
l

I N P U T T O I I I V E R T I N GA M P I
FROM Jr(9)
I

la
I ^--s E rN o r E
3

+ REFSENSE
r c o r vJ r l a l
+ R E F r 0 J t( J )

I
)

5

Figure7-22. SchematicDagram, Referenceand Ratio
C i r c u i t sA
, 1, A13.

7431744

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+ 17VC-t) Wx
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4az |
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f
--

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t
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--l-f
r
s
t
l
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a-'^iDa-DZ
2
Jt
| (((t,{r
|
r-u------J99
3 ; ; - t '

-T
----

r-\
I
ß t-'

:;.:
r

i:

,iä:r
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( *
9sö$!
?ääij'O
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':';ß?;;i-:,*$1,sE1i;V
----,,

F.---*-a

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l l " n "
|
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lt - l l " L - r
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l'l
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fil . l

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l

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It ' ll

!|J-

AI
tlp Port No.0349O'66501
Rev

E

L E T T E A S A O W NB E S I D E
GFOUNDSYMBOLON
S C H E M A T I CI N O I C A T E S
J U M P E FW IF E O E S I G N A T I O N

J U M P E R SM A Y 8 E A E M O V E D
D U R I N GT B O U B L E S H O O T I N G
T O I S O L A T E I N O I C A T E DP O B
T l O N S O F T H E C I B C U IT

3

, / o A l I M A r Nc t R c u r Ta s s E M B L y( o 3 4 9 o - 6 6 5 o t )

DATA
COUNTER

CLOCK
+5V

7

o.ol

(LTXF)
TRANSFER
L
FROM
UI8(6)

(HCDC)CLEARDATACOUNTER
F R O MU 2 3 ( 8 )
?r ( L T X F )T R A N S F E R
F R O MU t 8 ( 6 )

NOTE I

4Mi;Q
3.333[iz FoR /\/
5OHzOPERATTON

+5V

(LCDC)
CLEAR OATA
C O U N T E RL
F R O MU I 6 ( 4 )

7

l-r.o*. "
BH
n i!g!"?if'iJj scaN

FROM
POWER+5V
SUPPLY

U8

aH
LscaN
Rtl

tzK

LSHC
F R O MU 6 (

STATE CLOCK

FROM
POWER
SUPPLY

-5v---dä-!-- -"
IP*33|]3

c R r,

7

-1 8/s l-

* ou
T-.] |
l L l o v

U8

(H S H C
)
F R O MU 6 (

7
( H S C X )S T A T E C L O C KH
T O U 1 7 ( 3 ) , AJ r3 ( 4 ) ,A rJ 7 i l 3 ) ,A rJ 8 0 O )

7

1

3

1

6

t

5

( L S C K )S T A T EC L O C KL a
T O U 7 ( 9 ) ,U 1 6 i l 8 ) U
, 1 7 ( i l )r

NOTES,
t . r F GRYSTAL
MAY CAIJSENOrsE
IN
.NO|SY,
L I F
IN
TO

INSTFUMENTCOUNTSCONTINIJOUSLY
TEST 'I, U8 MAY NOT 8E s,I/ITCHING
LOW STATE.

FROMPOWERSUPP

I
I
I

coLFf
üa;ir6?tdiffffi

FicaRDöo-iim-i-

3 UF F E R S

DATABIT O H

O A T AB I T C H

. \.
'r./ , > -

DATA BIT B H

.
F-

I

>.L/

T I M I N GC O U N T E R

TO OISPLAYAND ,
DATAOUTPUT J

I
l._
:ATA

BIT A H

to,@oF
--i
rm,@

c@{rs

$@OR
eo,ooo --l
couNrs

I--\------lJ |
\

I
I
I
|

7
T I M E C O U N T2
(HTC2)
TOUt5(t3)

( H r c 4 )T r M EC O U N4T T O' , a , O ' I
( H r c s ). M E c o u N r 8 r o u r 5 a 4 )

\ 7

T I M E C O U N TI
(LTCr)
T OU t 5 i l )

( H r c r 6T
) ' M Ec o u N T1 6 T o u r 5 r s )

|
?

|
( H r c 3 z )T I M Ec o u N r 3 2 r o u r s t r z tI,
u r 8 i l 3 ) u. 2 2( 2 )
)

t
H

-

r

7I

(L C r C )
C L E A RT I M EC O U N T E LR
F R O MU t 6( t )
T I M I N GC O U N T E R
OUTPUTS
COUNTS

sior'rar

+ I7V FROM
POWERSUPPLY

H T CI

Hr.c2
HTC4
HTCS
H T CI 6
HTC32

PERIOD
6OHz LINE

sOHzLINE

+ r o , o o o +roo.ooo
* t o , o o o + roo,ooo+ro,ooo+ roo,ooo
ro,ooo
roo,ooo
5mS
6OnS
20,ooo
200,ooo l 0 m S
IOOmS
l2mS
l20mS
40,ooo
400,ooo 2OmS
2OOmS
24mS
24OmS
80,ooo
800,ooo 4 0 m S
4OOmS
48 mS
480mS
r60,ooo r , 6 0 0 , o o o EOhS
SOOmS
9 6m S
95OmS
320.OOO 3 , 2 0 0 , o o o l 6 O m S
r . 6s
1 9 2m S
t.92S

+ r 2 v T o u 9 ( 2 8 ) ,7
u40t(28) g

-6V TORil,R44I

I

Figure 7-23. SchematicDiagram,Clock and Counters,

7451-

- 5v c.lJ wc

4 f , 2

+t7v(t-\)wH
-t7v 6\wr

|

aaaa

+5v 6!wJ

$ o

YELO

ti\.-

BLUO c l
rrHTo

I

OBRN

t 2 t 4 5 6 ? 8 9 r O i l 1 2 1 3 1 4

a a a a a a a o a o a o o a
-aö

---.

t| |T | :
r

l

i
i

r
t

i--a

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r

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i

;

r

i

l

:
i

l
i

i
i

l

l
I

iTT
|

r
r
l

l
l
l

i

i

A5
hp Port No. 0349O-66505
C I R C U I TS I D E

OREO
.O8LK

i
++++
r

'

!

!

I
I

|

I

r

l

I
I

i'---1

|

i i i

i

*"-r.t

tE-oro-u*oi

M A | N C T R C U TATS S E M E L Y( 0 3 4 9 0 - 6 6 5 0 t )

ffiJ-*orie-r*E

a H(HFFA)
[-rurucrroru

.1 Z
rslrqr'l
6o R A, rt

t t -

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i'ii

oG

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l

l_rur.r,o*rr,rro,_$;11*|3

t - n q N a e ^ r , *I .l ,* ' il ,,
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[-.o*0..",r*.,j#

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'ä;glYr
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a HtHssar
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i i.-l,.

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s5B I
IMANI I
|

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SAMPLERATE
S5A

|.qdFl

2

6
7

g l?adil

:: L qhi l l" - .. 1i r" < \) "
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r,,,
I
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A S S E M B L (YO 3 4 9 O - 6 6 5 0 5 )

,l

lFUNcroNl

;UNCTIONBIT
FUNCTION
8
A
L
H
AC
H
L
0c
L
L
TEST
H
H
I =HIGH.+4.OV OR GREATER
O = L O w . OT O + O . 5 V

l-

fl
lFaN6E-l
s4

Ft tcTtoN

s3

(SHOWNWITHAUTO SELECTEO)

/A

/-\'

RANGE

o . rv ( K o )
. tv (Ko)
r o v( K o )
roov(Ko)
rooov(Ko)
r 0 . 0 0 0K n

f
-\1,

o4

RANGEBII
C B A
H H L
H L H
H L L
L H H
L H L
L L H

l

I

(VIEWEOFROMLEFT)

l=HIGH=
+4.OV ORGREATER
o=Low=o To +o.5v

S A M P L ER A T EB I T
C
B
A
I HOLD

6
7
I
9 FAST

H
H
H
H
H
L
L
L
L

H
H
H
L
L
H
H
L
L

H
H
L
H
L
H
L
H
L

DELAY
(STD)

i
H
d

H
H
H
H
H

NOTES.
I. I F TROUELEIS ISOLATEDTO THE 45
. BOARD.CHECK HIGH AND LOW LEVELS.

' .o s
t . 2s
ts
SOOhS
6OOmS
40OmS
2OOhS

o

O . L O W = OT O + O . 5 V

R6
2.2K

r.r - err - plc-xlno aOMpÄNt-

34904- D-28t4

11
Figure7-28. SchematicDiagram,Function, Range,and Sample
Rate Switches.A5.

7-ss17-s6

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a
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Rev B

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Rev C

NOTE 1: Rev.B requiresA6R44 in the cableassembly;Rev. C has
AOR44 mounted on the board. lf the 46 boardis replaced,exercise
careto assureA6R44 is not in the cableassemblyif Rev.C is used
to replaceRev.B.

l,lr
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ATTENUATOR
NOTE 3
lOpF

llNPUil
HIGH

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I

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AIJz

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2.4-24.5
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porf N o . l l l l S - 2 6 5 0 1
Rev. A

Ul,U2

A22Al

A22Al
hp PortNo.o349o-66522
3490A-A-5002

422A2

42242

hp pott No.03490-66523
422
hp PortNo.0349O-60302

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aSSEMBLY
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( o 3 4 9 0- 6 0 3 0 6 )
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HIGH

LOW

S H I F TR E G I S T E R S

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+5V

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(o3490 - 6650S)
+' 5- '\ / r.

F R O T VO U T G T J A R D
POWERSUPPLY

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- \

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OUT
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7--r48t

DATA FLAG

I

15

Figure 742. SchematicDagram, Data Output Option 021,
49. Al0. A15.

74317-64

A t l

H t l

hp Pott No.O349O-665t1
R e v .C

1

6

r

6

9

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FLAT SIDE
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hp Port No. 03490-665t7
5490A-A-

5001

-

At7A2
At7

hp Port No.O349O-60308

h p P o r t N o o0 3 4 9 O - 6 6 5 1 8

| T N G U A RRDE M o T Ea s s E M B L yo p l o N o z 2 ( o 3 4 9 o - 6 6 5 t r )

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LOCAL/REMOTE
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(o349o-66517) | (o349o-665t8) |

U5
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AR

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r500

LOCKDELAY

0.039

SHIFT
EGISTERS
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l/
+5VI

I

(HMDB)
+5V

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Figure 7-35. SchematicDiagam, Sample/HoldLogic Circuits,A2g.

74917-70

fI

jil
;l
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t"
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TableT-7. AlphabeticalListingof 349OAGplB l/O Mnemonics.

:l "..,

.:a.

:::;:
AAA
AAB
AAC
AAD
AAE
ADT
AOH
ATR
AUT
CDS
CLK
CRA
CRB
cRc

cRs

;ä

*,'$
".ä

_;3
1ä
,..r1

-J

DAC
DAV
DCA
DCB
DCC
DCD
DFC
DFL
Drol
Dto2
Dl03
Dl04
Dto5
Dt06
DloT
DroS
DMA
DMB
DMC
DMD
DOA
DOB
DOC
DOD
DPP
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ETF
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FAT
FFA
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GTI
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IDS
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IFB

Assigned Address Bit A
Assigned Address Bit B
Assigned Address Bit C
Assigned Address Bit D
Assigned Address Bit E
Addressed to Talk
ASCII Output Bit H
Autorange Programmed
I nternal Autorange
Clear Designator Counter
System Clock
C o m b i n e d R a n g eB i t A
C o m b i n e d R a n g eB i t B
Combined Range Bit C
Clear Remote Storage
Data Acceoted
Data Valid
Data Counter Bit A
Data Counter Bit B
Data Counter Bit C
Data Counter Bit D
Data Function C (Ratio)
Data Flag
Data Input/Outpur Bit 1
Data Input/Output Bit 2
Data Input/Output Bit 3
Data lnput/Output Bit 4
Data Input/Output Bit 5
Data Input/Output Bit 6
Data Input/Output Bit 7
Data Input/Output Bit 8
Decoder Bit A
Decoder Bit B
Decoder Bit C
Decoder Bit D
Data Output Bit A
Data Output Bit B
Data Output Bir C
Data Output 8it D
Displayed Polarity
End Output
External Trigger Flag
Externäl Trigger
External Encode
Front Panel Autorange
Front PanelFunction Bit A
Front PanelFunction Bit B
F r o n t P a n e l R a n g eB i t A
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Guard Transfer I nitiate
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Hold
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Inguard to Out$rard Data Bit
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Inhibit Sample/Hold
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Multiplexer Select Bit D
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New Programming Data
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Present State Bit F
Present State Bit G
P r e s e n tS t a t e B i t H
Oualifier Bit 1
Oualifier Bit
Remote Enable
Ready For Data
Remote LE D
Remote Ooeration
Reset
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Scan C
State Clock
Store Data for Output
Sample/Hold Delay
Sample/Hold Mode
Sample/Hold Program
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