K_227 K 227
User Manual: K_227
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Test Instrumentation Group
Keithley Instruments, Inc.
28755Aurora Road
Cleveland,Ohio 44139-1891
(216)X3-0400 . Fax: (216)498-2704
1-800-552-1115
INSTRUCTION MANUAL
MODEL
227
CURRENTSOURCE
(AND MODEL 2271 PROGRAMMING OPTION)
INSTRUCTIONMAMlAL
Model 227
(and Model 2271 Programing
Optionj
OCOPYEICHT 1976, KEITHLEY INSTRUMENTS,INC.
FOURTHPRINTING, JAN. 1978, CLE"!%LAND,OHIO, U.S.A.
MODEL227
WARNING
EXTREMECARESHOULDBE TAILFNTO AVOID
CONTACTWITR RIGH VOLTAGESWRENMAKING
CONNECTIONS
n, EXTh?2NALTERMIIULS OR
WRENSERVICING TRE MODEL227 WITX TOP
AND BOTT(3.lCOVERSRZMOVEV.
RecommendedProcedures for User Safety:
0975
2.
Make certain third-wire
ground pin an line power card ls connected fo earth ground.
This will ensure that the Model 227 chassis is at ground potential.
3.
Before making connections anywhere on the front or rear panels, remove power to
Model 227 by detaching the line power cord, or by setting the power switch to OFF,
or by setting the OUTPUTSELECTORswitch to "SHORT" or "OPEN". Also, remove all
external power Sources which may be connected between LO and CASE.
4.
If the Model 227 LO terminal is to be floated above CASE, make certain
metal link is removed between front panel LO and CASE terminals.
5.
Make certain cable connections are well insulated and that no bare wires
posed. Use connectors with fully enclosed and insulated virinS.
6.
During calibration
with top and/or bottom covers removed, extreme care must be
Use insulated tools and gloves for
taken to avoid contact with exposed circuitry.
maximm safety.
Various test points and adjustment circuitry
my be up to 300
volts potential.
that the
are ex-
iii
CONTENTS
MODEL227
CONTENTS
SECTION
PAGE
SPECIFICATIONS
__-----_________-____________
vi
1.
GE-
I&?,,mTION
2.
INITIAI.
PREPARATION__--------___------_---
2
3.
,,PE&Q-ING INS'fRUCTIONS--________-__-______-----
8
4.
*CcESSlJRIES _----__---_-__-_____----------------
24
5.
THEORYOF OPEP\ATION__--________________-----------
25
6.
MAINTEN)JCE ---_--___---__-_____----------------
27
7.
REPmCE&,LE PARTS__-______--___-___-____I___
39
SYNDICS
iv
__-__-_----_-_____________________
--__--------_____------------------------
1
60
0975
MODEL227
ILLUSTRATIONS
Fig. No.
1
2
3
4
5
6
0975
Title
Page
FrQ"f panel. ____________-__-__--______I_____________----Rear Panel Showing Line Switches. --------------------------RecommendedMounting and Ventilation.
-----------------------LQc*tiQ" of *ir Filter.
------------------------------------Voltage Levels Present at Front and Rear Panel Terminals.
Front Panel Terminals and Controls. ---------------__-_---------
1
2
3
3
------
7
8a.b.c
9
10
11
12
13
14a,b
Rear p**e1 Terminals. -------------------------------------Output Selector Switch Positions.
-----------------------------Voltage Output Versus % Rotation for Compliance Control. ------Connections as a Current Source with Resistive Load. ---------Connectians es a Current Sink wirh Resistive Load. -----------Connections as a Current Source with Capacitive Load. ---------Connecrfo"s as a Currenr Source with Inductive Load. ---------Power Limits when used as a Current Sink. ---------------------
15
16
17
Typical Output Impedance Versus Frequency for lOOOvA Range. ---Output Noise Versus Compliance Voltage.
--------------------Output Noise Versus RC Time Conetant of External Load. -------
18
19
20
21
22
23
24
25
26
27
28
Connections for Floating Operation. --------------------------Frequency Response for Voltage Programming. ------------------Use of Voltage Program Inpur to Modulate Current. -------------Rear panel Remote Progrenrming Connector. -------------------Compliance Progranrming up to 5OV. ---------------------------Compliance Programming up to 3OOV. ---------------------------Resistance
Programming
of Current. --------------------------Preferred Cabling Te.=,,"iques. __-______________--------------Model 1008 Single Rack Mounting Kit. -----------------------Overall Block Diagram of Model 227. ---------------------------Simplified
Diagram of Current Source. -------------------------
29
30
31
32
33
34
35
Test Set-up for Model 22712271 Calibration.
------------------Location of Adjustments with Top Cover Removed. --------------Location of Adjustments with Bottom Cover Removed. ------------Chassis Assembly.
---------_______________________________----Compo"e"t Layout,
PC-330. ------------____-____________________
component Layout, PC-331. ----------------------------------Component Layout, PC-342. ------------_-______________________
36
Case
37
38
Case Outlines,
Case Ourlines,
Outlines,
Integrated
Circuits.
---------_--_-----_-----
Integrated Circuits.
------------------------Transistors.
__-_-------__-------____________
5
7
7
9
10
11
11
13
13
14
15
16
16
17
18
18
20
21
21
22
23
24
26
27
36
38
38
41
53
55
56
57
58
59
SPECIFICATIONS
MODELZL,
SPECIFICATIONS
Calibrated
AS A DC CONSTANTCURRSNTSOURCE
OUTPUT:
current : ?l microampere (1000 microamperes full
range) to tlOO0 milliamperes in four decade
ranges; 3-digit
in-line
readout; 11% overrange
to 1110.
Voltage Compliance: *300 volts on 100 milliampere
f50 volts on 1000 milliampere
range and lauer.
adjustable
range. Compliance limit continuously
from appraximately 3 volts t0 full voltage cam-
et 25'C " 3*C
GENERAL
STABILITY: C(O.O05% of Betting + 0.005% of =ange)/Y
Short-tefm stability
up to 30 days is masked by thi
temperature coefficient.
LOADR!.?GULATION: t0.005% of range from no load to
full load.
LINE REGULATION: +O.OOS%of range for 10% change in
line voltage.
NOISE: Wideband noise less than (0.03% of range + 2
millivolts)
~llls above 5 Hz.
plialXe.
1500 volts maximum off chassis ground.
Floating:
RESOLUTION: 0.005% af range, 3-digit
readout.
ACCURACY: ?(0.5% of Betting + 0.12% of range).
AS A BIPOLAR PROGRAMMABLE
CONSTANT-C”RRRN’f
AMPLIFIER
VOLTAGEPROGRAMMING
(INPUT): DC-coupled o to tll
volts.
Input resistance 10 kilohm. Input must be
isolated from Output load by greater than 106 ohms.
TRANSFERFUNCTION t10 volts dc for f full-range
CUTrent OUtpUt. Accuracy *0.5%, zero offset less than
0.1% of range.
BANDWIDTH(-3dB):
600 Hz minimum.
OPTIONALPROGRAMMING:Model 2271 option permits remote programming of Range, Magnitude, Polarity,
Compliance Limit (See Model 2271).
Specifications
for Model 2271 Programming Option.
Calibrated
$.NGE SELECT:
range.
Closure*
on ane af four lines
:uRRRNTSET:
Voltage Programming: Standard feature
of 227.
227. see specifications
selects
of Model
Programming: Transfer function:
10% of
full range per kilohm (?O.S%). Zero at approximately 11 kilohms.
Stability:
adds +(0.01X of
setting + 0.01% of range)/"C to Model 227 speciResistance must be isolated end shieldfication.
ed.
Resistance
:Ol@LIANCE
LIMIT:
Closure" enables external canExternal operate:
rrol af both span and limit.
Open enables 227
front-panel
control.
Closure* enables compliance limit to
span Select:
be set fram 10 to 300 volts, open makes span 4
fO 50 volts.
vi
ENVIRONMENT:
operating:
humiO'C to 50°c. 0% to 80% relative
dity up to 35'C. Requires approximately Z-inch
top and 6-inch rear panel clearances for air
movement *
storage:
-25'=C to 70°C.
CONNECTORS:Output (front and rear), Voltage Programring Input (rear); Binding Post=.
POWER: 90-110, 105-125, 195-235, 210-250 volts
(switch selected),
50-60 Hz; 145 watts.
DIMENSIONS, WEIGHT: Style N, 5-l/4 in. half-rack,
overall bench size 5-314 in. high x S-314 in. wide
x 15-l/4 in. deep (145 x 220 x 385 mm). Net weight
24 pounds (lo,9 kg).
et 25'C i: 3°C
conlp11ance Limit set: Resistance programmed, nanlinear transfer function,
OR yields high end of
span, 25ko yields approximately mid span, open
circuit
yields law end. Resistance must be isolated end shielded.
Logic "0" (sO.4V drop while sinkFlag (Output):
ing 16mA t0 external power supply LO) appears
when 227 16 in compliance limit.
Logic "1"
@2.4V at up to 400vA referenced to supply LO)
appears when 227 is not in compliance limit.
RRQUIRRDCONTROLLEVELS:
*CLOSUP.Rz Closure to external power supply LO with,
in 0.5 vale while sinking 5OmA (range-select
for
l-ampere range requires sinking lOOmA).
OPEN E >2 kilohms referenced
t0 external po"e=
supply LO.
EXTERNAL POWERSUPPLY: Requires
external
PO”e=
supply of 5 te 6 volts @ ZOO&..
CONNECTOR:DAM-15s type mounts on 227 =ee= panel.
ACCESSORIESSUPPLIED: Mating connector.
0975
MODEL227
GENERA,.INFORMATION
SECTION
1.
GENERAL
l-l.
INTRODUCTION. The Model 227 is a dc current
source with full range current from 1 milliampere
to
The Model 227 provides a compli1000 milliamperes.
ance up to 300 volts on lmA, lOmA, and lOOmAranges
or up to 50 volts on 1OOOmA
range. The output is bipolar.
Load regulation
is ?0.005% of range from no
load to full load.
l-2.
FEATURES.
a. Three digit readout has least significant
digit continuously
adjustable using Fine Current
Control.
Typical setability
is 1 degree of rotation (which corresponds to 0.005% of full range).
b.
Compliance limit
is adjustable
e.
Outpur can be floated
d.
Voltage programming input
to i500 volts
above case.
is standard.
e. Model 2271 Programming option
factory installed.
0975
up to 300 valcs.
is available
INFORMATION
1-3. WARRANTY
INPORMATION. The warranty ,is stated
on the inside front c.over of the manual. If there
is a need far service, contact your Keithley representative or authorized repair facility
as given in
our catalog.
The Service Form supplied at the back
of the manual should be used to provide the repair
facility
with adequare information
concerning any
difficulty.
1-4. CHANGENOTICE.
Improvements or changes to the
instrument not incorporated
into rhe manual will be
explained on a yellow change notice sheet attached
to the inside back cover of the manual.
1-5. PROGRAMMING
OPTION. The Model 2271 is a factory-installed
option which enables remote programming of range, magnitude, polarity,
and compliance.
Current magnitude and compliance can be resistance
programmed. Range and compliance maximum are selected by means of closure to external power supply comcm*. An external +5 volt supply is required to energize relay coils in the Model 2271.
1
INITIAL PREPARATION
MODEL227
SECTION
2.
INITIAL
2-l.
GENERAL. This section provides information
needed for incoming inspection and preparation
for
use.
2-2. INSPECTION. The Model 227 was carefully
inspected both mechanically and electrically
before
shipment.
Upon receiving the instrument,
check for
any obvious damage which may have occurred during
transit.
Report any damages to the shipping agent.
To verify
the electrical
specifications,
follow the
procedures in Section 5.
2-3.
PREPARATION
b. Line Fuse Requirements.
The Model 227 uses a
2-1/2A 3AG slo-blo fuse for the range 90-125V and a
l-1/4A line fuse for the range 195-25OV.
The Line
Fuse is located an rear panel a8 shown in Figure 2.
C. Line Power Connections.
An accessory line cord
ia furnished with the Model 227. The 3-wire, 8 foot
(244 cm) line cord mates with the rear panel receptac
P306. Extra line cords can be ordered from Keithley
by specifying
Keithley Part NO. CO-7.
d.
PREPARATIONFOR "SE.
The Model 227 has
a. How to Set Line Switches.
two rear panel line switches which are used to select
line voltage ranges of 90-llOV, 105-125V, 195-235V,
or ZlO-250V as shown in Figure 2. The line switches
are identified
as 117/234V (S303) and LOW/NORM(5302).
Once the line voltage to be used has been derermined,
then the line voltage range should be selected from
the four ranges available an the Model 227. For example, when the line voltage to be used is within
the range from 105 to 125 volts, then the line
switches should be set fo “117V” and "NORM" pasitions . If the line voltage to be used is within
either of two overlapping ranges, such as 107 volts,
then either range may be selected (117V, LOW, or 117V
NORM, for this particular
example).
Line voltages
which are not covered by my one of the four rages
require an appropriate step-up or step-down transformer.
FIGURE 2.
Rear
Mounting and Ventilation.
1. Bench Mounting.
The Model 227 requires a 2
inch c1earanc.e above the tar, cover and ar least a 6
inch clearance at the back panel to allow for air
circulation.
Care should be taken to keep the
filter
an the top cover clear of any obstruction.
(See Filter Replacement, paragraph 2-3 d3.)
2. Rack Mounting.
The Model 227 can be rack
mounted usins accessorv Model 1008 Sinele Rack
Mounting
Kit (and Model 2272 Rack Panel Adapter,
which allows clearance over the tap cover of the
Model 227). See Section 4 for installation
instructions.
The Model 227 requires 2 inch clearance above the top cover and at least 6 inch
clearance at the back panel to allow for air cirCUlEdOlI.
Care should be taken to keep the filter
on the tap cover clear of an obstruction.
Panel Showing Line Switches.
0975
MODEL22,
INITIAL
IMPORTANT
The Model 227 has been designed to operate
at up to 5O'C ambient temperature.
Sufficient ventilation
should be provided so that
the fan which circulates
air through the
Model 227 is able to maintain a flow af.cooling air as shown in Figure 3. Should a fail"re of the fan occur or abnormal internal
heating occur, the Model 227 automatically
shuts down. The thermal c"t-""t
in the Model
227 will operate regardless of the condition
of the fan.
3. Filter Replacement. The air filter
in the
Model 227 is located as shown in Figure 4. The
filter
should be cleaned or replaced at least once
per month under laboratory conditions,
or more
often when used in industrial
environments.
The
filter
can be checked and replaced by removing the
top ccNer. Replace with Keithley Part No. 25791.
RECOMMENDED
CLEANINGINSTRUCTIONS: To clean
the filter,
remove top cover, detach filter
from cover, flush filter
with water, and recoat with Research Products "Super Filter
Coat Adhesive".
(Research Products Corp.,
1015 E. Washington Avenue, Madison, WI.
53701.)
CAUTION
Read and underera"< the following safety
Precautions before power is applied to the
Model 227 or co"nections are made co any
tKGIi"SlS.
e. Safety Precautions.
The Model 227 should be
operated with care since potentially
lethal voltages
are present at various terminals on the front and
rear panels.
IMPORTANT
whenever it is **ce**ary to turn power on or
off to the Model 227, set the OUTPUTSELECTOR
to SHORTor OPENand set the VOLTAGECOMPLIANCE
control to minimum voltage.
This will ensure
that power turn an and t"fn off action "ill
not
affect the load.
1. How co Safely Disconnect the Load. The OUTPUT SELECTORSwitch (SlO4) should be used to safely
disconnect the load from the Model 227 o"tp"t.
a). SHORTPosition.
This position should be
used when disconnecting
a resistive
or inductive
load.
In this position,
the Model 227 output currenf by-passes the output terminals.
In addirion,
a 10 ohm, l/2 watt resistor
is connected across
the o"tp"t terminal.
As a result,
th.e SHORTposition should not be used with capacitive
loads
greater than l!,F or external voltage supplies
since damage to the Model 227 and the load could
result.
OPENPosition.
This position should be
b).
used when disconnertina
a caxacitive
load.
1n
this position,
the Mod;1 227'auQut current bypasses the output terminals.
The output terminals are open. Do not use this position with inductive loads since a high voltage may be instantaneously developed at the output terminals due
to an interruption
of current flawing through the
inductance causing possible damage to the Model
227.
FILTER SCREW
\
III
RACK MOUNTING
HARDWARENOT
SHOWNFOR CLARITY
FIGURE 3.
0975
6 in.
CLEARANCE
AT BACK
PANEL
RecommendedMounting and Ventilation.
PREPARATION
I
FILTER SCREW
FILTER INSTALLED ON TOP COVER
FIGURE 4.
Location
of Air Filter.
INITIAL
MODEL227
PREPARATION
2. How to Safely Use Front and Rear Terminals.
(See Figure 5 and Table 2-l for a complete listing
of all voltages present.)
Terb). Front and Rear Panel LO Terminal.
minals JllO (Black) and J108 (Black) can be at
500 volts if LO is floating
above CASE (Green).
Front and Rear Panel HI Terminal 0109,
4.
5107). These terminals provide current output up
to the maximum compliance voltage as set on rhe
Model 227 (either by front panel range switch or
by Model 2271 Remote Programming). As a result,
the terminals can be up to 305 volts above LO
(Black) depending o" range selected.
If ehe LO
eerminal is floating
at 500 volts above CASE
(Green), the" up to 805 volts can be present at
HI. Far operator safety, set COMPLIANCE
LIMIT
to minimum or set OUTPUTSELECTORSwitch to "SHORT"
or "OPEN".
Voltages
c).
VOLTAGE PROGRAMMING Terminal.
Terminals
JlOl (Blue) and 5102 (Black) float at output HI
potential
and can be up to 306 volts above oufp"f
LO (Black).
MONITORTerminals.
Terminals 5103
d). CURRENT
and 3104 float at output HI potential
and can be
up to 305 vales above ouepue LO.
e) . VOLTSMONITORTerminal. Terminal J105 is
a buffered oucpur and can be up to 305 volrs
above output LO. Terminal
5106 at the same poteneia1
as output LO.
TABLE 2-l.
at Front and Rear Panel Terminals.
Maximum Voltage
Referenced ea CASE Jill
Grounded LO I Floating
LO
Ci*C"it
Desig.
5107 (Rear)
305 "
305 "
OUTPUTLO
OUTPUTLO
JllO (Front)
JlO8 (Rear)
0"
0"
I
500 "
500 "
VOLTS MONITORHI
VOLTSMONITORLO
J105
5106
305 "
0"
I
805 "
500 "
CURRENTMONITORHI*
CURRENTMONITOR LO*
5103
5104
VOLT PROGRAM
HI*
VOLT PROGRAM
LO*
JlOl
RESISTANCEPROGRAM
In*
RESISTANCEPROGRAM
Lo*
5401, pi" 2
5401, pi" 10
J109
(Front)
I
I
5102
I
305 "
306 V
306 "
306 "
306 "
306 "
805 "
805 "
I
I
805 "
806 "
806 "
806 "
RO6 "
806 "
*IMPORTANT
fused by FlOl which is a type 8AG fast-acting
fuse
rated at 0.125 amperes. A short circuit
to output LO will cause the
fuse to blow within 5 seconds. w:
Instantaneous currenf could
exceed ZOOmAuntil fuse blows.
These
terminals
are
1174
INITIAL PREPARATION
MODEL 227
CURRENT MONITOR
J104
0.125A
t
1V = FR
5103
WMNING! THESEPOINTS CAN SAVE
A COMPLIANCEVOLTAGEUP TO 305
VOLTSAT 100 MILLIAMPERES. EXCEPT FOR OUTPUTRIGS ALL POINTS
ARE INTEZ?NALLYFUSED.
VOLTS MONITOR HI
J105
REAR PANEL
FRONT PANEL
OUTPUT HI
t
5107
J109
LOAD
JllO
*
J108
E
OUTPUT LO
OUTPUT LO
S108
Jill
A
FIGURE 5.
""lt=ge
FLOAT/GROUND
SWITCH
THIRD WIRE
ON LINE CORD
Levels
Present
at Front
-L
and Rear Panel Tern,inals.
5
INITIAL PREPARATION
00*t*01
or
MODEL227
C""*ector
Front Panel
Power Switch (S301)
Applies
power to instrument.
OUTPUTSELECTORSwitch (S104)
Sets output configuration.
connect the output load.)
Range Switch (SlOl)
Sets full range current
end 1OOOmA).
Decade Selector
These switches
rent output.
to 10, while
justable.
Fine Current
Switches (S102, S103)
Control
C"RRENTPolarity
(R124)
Switch (S105)
(Should be used to safely
dis-
are used with Fine Current Control to set curEach switch has discrete decade steps from 1
the Fine Current Control is continuously
ad-
2-3e
3-3f
3-3g
Adjusts current between 0.000 to 0.011 times full range.
This control is continuously
adjustable.
Typical setability
of 1 degree of rotation
or 0.005% of full range.
3-3g
sees output
3-3e
polarity.
Adjusts
XZETER
"/A Switch (S106)
Sets meter to read voltage
'IETER Xl/X10 Switch (5107)
Sets meter sensitivity
COMPLIMIT
Indicates
(X104)
3-3b
in decade stepe (lOOOuA, lOmA, lOOmA,
VOLTAGECOMPLIANCE(RlOl)
Indicator
Paraaraph
Description
compliance voltage
compliance
limit
up to 300 volts.
3-3d
or current.
for scale factor
limit
of Xl or x10.
mode when lighted.
3-4a.l
Dutput RI (JlOS)
C""necti""
to output HI.
(In parallel
with 5107.)
3-2al
Output LO (JllO)*
Connection
to output LO.
(In parallel
with
5108.)
3-2al
CASE (X11)*
FLOAT/GROUND
Switch (SlO8)
Chassis ground.
(Connected to third wire ground.)
Connects LO end CASEwhen set to GROUND.
3-2al
Provides inputs and outputs for range, current, end voltage
control.
(Available
when Model 2271 option is installed.)
3-2b2
5102)
Provides
input
3-2bl
CURRENT
MONITOR(5103, 5104)
Provides
output
for monitoring
current
(1" = Full
VOLTSMONITOR(JlO5, 5106)
Provides
output
for monitoring
voltage
(up to 300 volts)
3utput HI, LO (5107, 5108)
Outputs which are in parallel
Rear Panel
REMOTE PROGRAM
(5401)
TOLTAGEPROGRAM(JlOl,
for voltage
programing.
with
front
Range).
panel HI and LO.
3-2a3
3-2a2
3-2al
NOTE*
On some models a Shorting link is provided to connecf LO end CASE. On models presently manufactured,
banana type terminals are used instead of binding post type and the shorting link is no longer used. A
front panel FLOAT/GROUND
Switch has been added to permit a connection between LO end CASE for grounded
applications.
0975
MODEL227
INITIAL PREPARATION
I
-
0975
7
Ii
OPERATINGINSTRUCTIONS
MODEL227
SECTION
3.
OPERATING
3-1. GENERAL. This section provides information
to
operate the Model 227 es a current eource or progremmeble current amplifier.
3-2. HOW TO MAKE CONNECTIONS
8.
OutPut Co""ectio"s.
1. current Output. Output current is provided
at the red (HI, JlO9) and black (LO, JllO) be"e"e
p0st.8 OXIthe front panel.
The green (CASE, ~111)
banana post is internally
connected to chassis
and line cord ground. Whe",connecti"g a load to
the Model 227 "se a cable rated at 1000 volts and
1 ampere. A second set of banana posts are provided on the rear panel (red, 5107 end black, 5108).
Make certain no connections are made to rear panel
terminals when the front panel output terminals
are being used.
Set compliance contwl to minimum and OUTPUT SELECTORto either SHORTor OPENbefore co""ecti,,"s
are made.
2. VOLTAGEMONITOROutput.
The rear panel VOLTS
MONITORbanana post (JlOS) permits
the user‘ to
monitor the out&t voltage bf the Model 227 without disturbing
the outp,,t current.
This buffered
output has a" output resistance of 10 kilohms.
As
a result a voltmeter having greeter than 100 megohms input resistance should be used to keep the
loading error below 0.01%.
3. CURRENTMONITOROutput.
The rear panel CURRENT MONITORbanana posts (blue. 3103. and white.
5104) permits the usa to &,"itbr
the current of
the Model 227. This output provides a 1 volt dc
level corresponding to full range output curre"t.
Output resistance is 10 kilohms.
Both blue and
white terminals are floatine. at the outhit HI voitage.
Monitor voltage polarity
is opposite of o"tput current polarity.
b. Input connect.ions.
1. VOLTAGEPROGRAM
Input.
The yellow (5101) a.ld
white (5102) banana poets petit
the user to set
the o"tput current of the Model 227 ofi a given
range wing a voltage from 0 to t10 volts.
The
input is dc coupled and has 8" input resistance of
1OK ohms. The o"tput current can also be modulated by using e signal generator with floating
o"tput.
The transfer characteristics
of the voltage program
input is show" in Figure 19. See Section 3-7 for
a detailed discussion of voltage programming.
When the Model 2231 Remote
2. PROGRAM
Option.
Program option is installed,
the Model 227 can be
remotely programmed to select range, current level,
A 15-pi" connector (5401)
and compliance voltage.
is provided when the Model 2271 is installed
atlthe
See Section 3-S for a detailed discussion
factory.'
of the remote program option.
INSTRUCTIONS
3-3.
HOWTO SET OUTPUTCURRENT.
a. Set OUTPUTSELECTORSwitch (S104) to either
"SHORT" or "OPEN" standby positions to eliminate the
possibility
of shock or damage to the load.
(See
also Section 2-3e for important safety precautions.)
b. Apply power to instrument
s301.
C.
using Power'Switch
Determine compliance voltage
d. Set VOLTAGECOMPLIANCEControl
desired maximum voltage.
1. This control
sets the compliance
3 volts to 50 volts
up to 300 volts on
required.
(RlOl)
to the
is continuously
variable end
voltage limit from apprax.
maximum on 1OOOm.A
range and
lower ranges.
2. This control has a tapered resistance such
that greater resolution
is provided far compliance
voltage settings under 60 volts.
Figure 9 shows
the voltage output vereus % rotation
of the control.
&5,.
f.
Set current
polarity
using Polarity
Set current
range using Range Witch
Switch
(SlOl).
1. This-switch
sets the maximum current in fout
decades (lOOO@. lOmA, lOOmA, and 1OOOmA).
2. The dial is designated in terms of engineering units, either PA (microamperes) or mA (milliamperes).
3. Full range is determined by the decimal point
position
(lighted)
and the engineering unit dieplayed (PA or mA).
Sl!;)
Set current outpltt using Decade Switches (S102.
and Fine Current Control (R124).
1. The Decade Switches set the two most significant digits in decade steps from 0 to 10.
2. The Fine Control provides continuous adjustment of the least significant
digit with typical
setability
of 1 degree of rotation
(corresponding
to 0.005% of full range).
The dial has a maximum
readout of 10 plus approximately 10% adjustment
beyond 10.
h.
Connect the load es described
in Section
i.
Sef OUTPUTSELECTORSwitch to "ON".
3-2a.
1. When set to "ON" the Model 227 can develop
"P to 50 volts at 100OmAor 300 volts at lOOmA.
2. Care should be take" when connecting the
Model 227 to inductive or capacitive
loads.
see
Sections 2-3e and 3-4b.
0975
OPERATlNG INSTRUCTIONS
MODEL 227
iI KITPUT HI
T
FIGURE 8a.
LOAD
"OPEN" POSITION
NO VOLTAGE IS DEVELOPE
ACROSS OUTPUT TERMINALSi
II XITPUT LO
1
-i
.:
I..
. . . . . . . . . . . . . . . . . . *. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ‘..
2 IUTPUT HI
I
FIGURE 8b.
"ON" POSITION
.“7‘
1
I-
3I
SHORT
LOAD
i( IUTPUT LO
7
.I
OPEN I
cfo4c
1
-
iC IUTPUT HI
y
FIGURE 8~.
NO VOLTAGE IS DEVELOPE
1
i
1
<
/001PuT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..-......
FIGURE Sa,b,c.
1174
I
1
LOAD
"SHORT" POSITION
ACROSS OUTPUT TERMINAL
V=IxR
Output
Selector
Switch
LD
1
:
Positions.
9
OPERATINGINSTRUCTIONS
MODEL227
TABLE 3-1.
Sumnary of Current Settings.
Range
Settings
Max. Dial
Settings
Max.
Voltage
Max. Power
to Load
1000 mA
1110. mA
1000 UA
11.10 mA.
1110. "A
5ov
3oov
3oov
3oov
55.5w
33.3w
3.338
0.333w
100 mA
10 mA
3-4.
111.0 r&A
2. Operation as a Current Sink. The Model 227
can be used as a current sink as shown.& Figure
11. In this case, the current flow is into rhe
Model 227. The output voltzige V, is a function of
E, I , and RL where:
", = E - I RL
E = external
I = c"rrent
RL = load resistance
How to Use with
1.
Operation
can deliver
Resistive
Loads.
as a Current
Source.
When the Model 227 is connected so a6 to.
.'
sink current
(that is, power is delivered
to the Model 227 by an external
power supply),
care should be taken to limit the
a constant
power delivered to the terminals of the
Model 227 as shown in Figures 14a and 14b.
If power dissipated within the Model 227
exceeds these limitations
overheating and
damage to the Model 227 could occur. For
example, if the external power supply is
capable of delivering
greater than 700
milliamperes,
then the voltage across the
Model 227 output terminals must be less
than 50 volts (approximately 46 watts
maximum internal
dissipation
allowed).
The Model 227
current UD to the compliance
is set-by use of the Range
and Decade Dials an the franc panel. With a resistive load as shown in Figure 10, the voltage developed across the load resistance RL is: V = I x
RL. If the compliance voltage setting V, is less
than the voltage V , then the Model 227 "ill
automatically
limit the voltage to V, and the LIMIT indicator will be lighted.
voltage
setting.
Current
,nn_
source
on Model 227
m
OPERATINGCONSIDERATIONS.
a.
voltage
setting
/COMPLIANCE
LIMIT ON 100 MA AND LOWERRANGES
275250225zoo-
COMPLIANCE LIMIT
ON 1000 mA RANGE
2
5
25-
APPROX 45' ROTATION
Ob
20
;o
3b
4b
50
6b
7b
20
do
d0
PERCENT ROTATION OF COMPLIANCE CONTROL
FIGURE 9.
10
Voltage
Output Versus % Rotation
for Compliance Control.
1174
OPERATINGINSTRUCTIONS
MODEL 22,
.,...........................................~.......
~
+%
*..i
1.
; . . . . . . . . . .%". . . . . ..-.............*.......
RESk;j
1
V-
~. . . . . . . . . . . i
IxRt
FOR RESISTIVE LOAD MODEL 227 WILL DELIVER
DIALED CURRENT UP TO COMPLIANCE VOLTAGE
FIGURE 10.
Connections as a Current Source with Resistive
V=E-V
Load.
0
FOR RESISTIVE LOAD MODEL 227 WILL DELIVER
DIALED CURRENT UP TO COMPLIANCE VOLTAGE VO = Vc
OUTPUT VOLTAGE VO MUST REMAIN WITHIN THE AREA
SHOWNIN FIGURE 15a OR 15b TO AVOID DAMAGETO
MODEL 227
FIGURE 11.
1174
Connections as a Current Sink with Resistive
Load.
11
INSTRUCTIONS
OPERATING
b.
How to Use with
Capacitive
MODEL227
or Inductive
Loads.
1. Capacitive Load. When a capacitive load is
connected, the Model 227 delivers a constant current until the voltage developed reaches the compliance voltage setting V,. The voltage V, charges
to a maximum V, according to the fallowing equation:
dt up to Vc (maximum)
where C = load capacitance
When using a capacitive load, it is preferred to
"se the "OPEN" standby position when not making
measurements to avoid shock hazard due to compliance voltage at the o"tp"t terminals.
Do not "se
ehe "SHORT" position since the voltage on the capacitive load will be discharged.
V, = $ I
TABLE 3-2.
comparison of Accuracy for Typical
Output
current
1mA
1mA
lll!A
l!llA
I
2. Inductive Load. When an inductive load is
connected, the Model 227 delivers a constant current the same as for a resistive
load. However, to
maintain stability
the ratio load inductance L
(Henries) to load resistance
R (ohms) should be
smaller than approximately lo-&.
This ratio is
non-linear
and depends on the amount of inductance
and the range so that larger values of L/R may be
needed to prevent oscillations.
A typical calculation of the L-Co-R ratio is as follows:
For R = 1000 ohms and L = 1 millihenry,
L,R = 1 x 10-311 = 1 x 10-S
lO"Q
If oscillations
occur at the output, add series resistance to lower the L-to-R ratio.
When using an
inductive load, it is preferred to use the "SHORT"
standby position when not making measurements to
avoid shock hazard due to open terminals.
Also,
the current should be dialed to zero before disconnecting an inductive load.
C. How to Use the Compliance Control.
The compliamce control sets the maximum comcJiance from BDI)TOXirately
3 volts to 50 volts on the 1OOOmA
range'and
from approximately 3 volts to 300 volts on lmA, lOmA,
and lOOmAranges. The compliance voltage should be preset with no load connected.
The front panel irieter can
be used as a guide to setting compliance.
(set
METERswitches to V and Xl or Xl0 as appropriate.)
The rear panel VOLTS MONITORoutput can be used to
adjust the compliance more accurately.
Use a voltmeter with an input resistance of at least 100 megohms to avoid loading error at VOLTS MONITORo"tp"t.
The control has a tapered characteristic
such that
the first 50% of rotation
represents a variation
from 3 to 60 volts to allow more resolution
at lower
Decade Did
Settings
b.
o-o-1
O-1-0
1-o-o
10-O-O
current
settings.
Range
settiw,
Total
Accuracy
lOOOm4
lOOmA
1omA
1OOOliA
il.205
ISA
t.125
mA
0'17
f.0062
mA
.mA
HOWto Determine Stability.
1. Time Stability.
Stability
wirh time is taken
into account by the basic accuracy specification;
(See also Temperature Stability
in the fallowing
paragraph.)
2.
Temperature Stability.
Stability
is specified
of range + 50ppml'C of dial setting).
The lowest full range for the best possible stability should be selected.
Maximum allowable ambient
as k(SOppm/'C
temperature
is
5O'C.
c. How to Determine Line Regulation.
Line regulation is t(.OO5% of full range) for a corresponding
10% change in line voltage.
For example, far a naminal line voltage 115V, the variation
would be +11.5V.
d. How to Determine Load Regulation.
The load regulation is specified as ?(.005% of full range) for
a change from no-load to full-load.
The no-load to
full-load
variation
corresponds co an output campliace voltage change of from 0 to 3OOv on the lmA,
lOmA, and lOOmAranges and from 0 to 50V on the 1000
mA range.
e.
How to Determine 0"tp"t
Resistance.
1. DC Output Resistance.
The effective
output
resistance of the Model 227 can be determined by
calculations
from the load regulation
specification.
For the lOOmArange:
x lOSO and % regulation
RL = 3
Since % regulation
- 100 x
then RIJ = 100 RL
mgr
or R. = 100 x 3 x 103
.005
= .005%.
RL
Ro + RL
= 6 x 107n
COmpliSnCSS.
3-5.
MEASUREM%NT
CONSIDERATIONS.
a. How to Determine Dial Accuracy. The accuracy is
specified as f(0.5% of o"tp"t + 0.12% of range).
Since
the total accuracy of the Model 227 is the sum of the
reading accuracy and the full range acc"rac;;-the
user should select the lowest full range for best
possible accuracy.
Table 3-2 shows the total accuracy for typical dial settings.
12
TABLE 3-3.
Output Resisfance
Range
1000
10
100
1000
“A
mA
mA
mA
for Model 227.
Output Resistance
x
x
x
1 x
6
6
6
10'0
10'0
10'0
lo60
1174
FOR CAPACITIVE LOAD MODEL 227 WILL DELIVER
DIALED CURRENT UNTIL COMPLIANCE VOLTAGE ",
IS REACHED
FIGURE 12.
Connections
as a Current
Source
with
Capacitive
road.
: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..-... ~
LOAD
INDUCTANCE
CL)
%. . .._........_.._..................................i
FOR INDUCTIVE LOAD MODEL 227 WILL DELIVER
DIALED CURRENT UP TO COMPLIANCE VOLTAGE
FIGURE 13.
Connecrions
as a current
source with
Inductive
Load.
MODEL 227
OPERATING 1NSTR"CTIONS
\
COMPLIANCE LIMIT
\
100 MILLIAMPERE
RANGE
CHARACTERISTIC
OUTPUT VOLTAGE MUST REMAIN WITHIN
THIS AREA TO AVOID DAMAGETO MODEL 227
\
I
0
I
10
I
20
I
30
I
40
I
50
I
60
I
70
I
80
I
90
SINKING CURRENT
r
G
I
I
I
100
110
120
*MILLIAMPERES
COMPLIANCE LIMIT
40-
I
5
it:
2
z
2
2
301000 MILLIAMPERE
RANGE
20-
OUTPUT VOLTAGE MUST REMAIN WITHIN
THIS AREA TO AVOID DAMAGETO MODEL 227
E:
%
d
z
CHARACTERISTIC
10'
s
5
z
nI
0
14
IdO
I
200
I
300
I
I
I
400
500
600
SINKING CURRENT
7:O
I
800
I
900
I
I
I
1000 1100 1200
*MILLIAMPERES
1174
MODEL227
OPEiATING INSTRUCTIONS
lO’Q-109 108 -
5
2
2
lo3 -Jo1
I
0.01
’
0.1
FREQUENCY
HZ
FIGURE 15.
Typical
I
100
I
1000
I
10K
Output Impedance Versus Frequency For lOOOvA Range.
2. AC Output Impedance. The output impedance of
the current source can be considered a shunt capacity across the dc output resistance.
TABLE 3-4.
output Capacifance
Typical values of output impedance versus frequency
far the IOOOpArange of the Model 227 are show! in
Figme 15.
NOTE
The ac output impedance should be considered
when using the Model 227 as an amplifier
since the loading error will be a function
of frequency of the signal generator.
For
example, if the load resistance is 300k0,
the loading error at 10 HZ will be approx-
1174
15
MODEL227
OPERATINGINSTRUCTIONS
f. How to Determine Output Noise. The Model 227
output noise is composed of two components: line
frequency ripple (lZO/lOQ Hz) and high frequency noise.
1.
tially
Line Frequency Ripple.
This noise is essena constant percentage of range.
2.
*t*nt
High Frequency Noise.
voltage.
0.3-
-
This noise is a con-
The sum of the t"o components can bg platted versus
compliance voltage 88 shcwn in FigFre 16. The rms of
range-current noise as a percent of the Model 227
range cm be obtained in two ways. First,
the percent
noise at a specific compliance voltage can be determined. For example, for a compliance voltage of 5
volts, the percent noise would be 0.07% as read from
Figure 16 of 5 volts or 0.0035 volts rms. Secondly,
by multipIyi"g
the percent noise (0.07%) times the
Model 227 range, a resultant
current noise con be deFor example, for a 5 volt compliance and a
termined.
1OOOuA full range, the rms current noise would be
0.07% x lOOOvA - 0.7uA. From Figure 16, it is evident
that a low compliance voltage high-frequency
noise is
dominant. At high compliance voltages, line frequency
If high frequency noise at low
ripple is dominant.
compliance voltages is objectional,
a filter
capacitor
my be placed acr"ss the load. A typical frequency
versus noise plot is shown in Figure 17 for 1 volt
For a give" RC the noise as a % of full
compliance.
range can be read directly.
COMPLIANCE VOLTAGE
FIGDIE 16.
0.3-
1000
100
10
1
.
_..
OUtput Noise Versus Compliance "alrage,
-
I
"a.1
'
TIME CONSTANT CRC)
I
I
Illll'
I
I
I
lllll'
10
1.0
-MICROSECONDS
I
I
IIIII'
100
MODEL227
OPERATINGINSTRUCTIONS
MODEL 227
CURRENT
-SnllRrF
- -. . --
_I_
OUTPUT LO<
1 1 E;
E
1 I
"RVLJI""
. . . . . . . . . . . . . . . . ..”
.." . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..-..
..-... j
-
-L.
-
-E-
v=
Et
FOR RESISTIVE LOAD MODEL 227 WILL DELIVER
DIALED CURRENT UP TO COMPLIANCE VOLTAGE V. = Vc
OR UNTIL CURRENT LIMIT OF EXTERNAL
VOLTAGE SOURCE IS EXCEEDED
FIGURE 18.
Connections
HOWTO FLOAT THE MODEL227. The Model 227 can
3-6.
be floated up to rt500 volts off chassis ground with
less than 5ppm of full range change in outpur current
per volt off ground. For floating
operation,
the
fronr
panel FLOAT/GROUND
Switch must be set to FLOAT.
A filter
capacitor Cl12 (.OZmfd) is connected between
the low and ground banana posts to minimize line freThe low to ground isolation
is approxquency pickup.
imately 10' ohms. gee note.
a. Extended Compliance Voltage.
A typical example
In this
of flaatine
ooeration is shown in Fieure lg.
example, the Model 227 can be used w&h a voltage supply such as Keithley Model 240A to extend the maximum
The Model 227 then
compliance voltage to 800 volts.
can be adjusted far a compliance voltage of +2OOV to
for Floating
Operation.
+eoov or -200v to -8OOV.
Since the maximum current
output of the Model 240A is 20 milliamperes,
the
dialed current on the Model 227 should not exceed
this maximum.
b. Precautions when "elng a" &xternaL YoUage
Source. When a" external voltage source is connected
in series with the Model 227 output, care should be
take" to observe the power limits shown in Figures
14a and 14b when sinking current.
For example, if
the external voltage source is capable of delivering
60 milliamperes at 300 Volts (or 7oomA at 50x9, a
shorted load could cause the Model 227 to sink current causing excessive power dissipation
and possible
damage to the Model 227.
NOTE
0" some models a shorting link is provided to connect LO and CASE. On models presently manufactured,
banana type terminals are used instead of binding post type and the shorting link is "a longer used. A
front panel FLOAT/GROUND
Switch has bee" added to permit a connection between LO and CASE for grounded
applications.
0975
17
MODEL'227
OPERATINGINSTRUCTIONS
DC
li'OO
I
I
I
I
I
III
1000
1
I
I
I
AT DC AN INPUT OF 1OV SETS THE CURRENT OUTPUT TO FULL RANGE (10-0-O
2
O-
IIlll'°K
DIALED CURRENT)
--
E
1
E
k2
2
tli-1Ol
2
-
1
AT 600 HZ
--
I B
gz
1
z
K
2 -202
1DK
FREQUENCY-
FIGURE 19.
HZ
Frequency Response for Voltage Programing
FRONT PANEL
DIAL SETTING
VOLTAGE
PROGRAM
INPUT
SIGNAL
GENERATOR
%
MODULATED
OUTPUT
MODEL
227
OUTPUT
LOAD
b
CLIPPING -
-.-\,
TYPICAL OUTPUT FOR
COMPLIANCE LIMIT LESS
THAN PEAK OUTPUT.
0
FIGURE 20.
"se of "olfage
Program Input
to Modulate Current.
OPERATINGINSTR"CTIONS
MODEL 227
HOWTO USE VOLTAGEPROGRAM
INPUT. The Model
3-7.
227 provides a voltage program input (standard) for
applications
requiring remote current control, or use
as a bipolar constant-cu==ent amplifier o= ac modulated constant-cu==ent source. The transfer function
for voltage programming is +I0 volts dc for t full
The output current is a sum Of Voltage
range output.
programming input & front panel dial settings.
Range can he set by the front panel controls
the
optional Model 2271. The input to the Voltage Programing terminals must be isolated from output load
h" ereat.er than 106 Ohms.
% error
to
Voltage
Program
or
use
as
a
1. get the current
in section 3-3.
3.
(dc level)
as described
Apply modulation
signal
from Signal Generator.
4.
Adjust the % modulation as desired by monitoring the Model 227 output using an ac coupled oscil1OSCOp~. Figure 20 shows a typical modulated CUTrent ourpur.
NOTE
The Model 227 Compliance Control may be adjusted to suit the measu=ement. However, if
the modulated signal causes the output to exceed the Compliance Limit. then the Model 227
output will be clipped.
Bipolar
setting:
The transfer function accuracy and offset
can be expressed by the fallowing equation:
TABLE 3-5.
Snecificarians
for Model 2271 Proaranrminn Option.
Calibrated
RANGESELECT: Closure* on ane.of fovr lines
range.
CVRRENTSET:
Voltage Programming: Standard feature
gee specifications
of 227.
227.
output
2. con*ect sign*1 Generator to Voltage Program
input.
The Voltage Program input is dc-coupled
Amplifier.
rh L bandwidth (-3dB) fo 600 Hz minimum. 1wut re-
error
+ 0.1%)
h. Ho" to "se as an AC Modulated Constant-Current
Source. The Voltage Program input can also be used
in conjunction with the front panel dial settings to
provide modulated current outputs.
NOTE
How
range) = i(O.5% $
The input floats at the output HI volrage and must
be isolated by greater than lo6 ohms. Since Volfage Program input may he floating at up to 300 volts,
the signal generator (or dc voltage source) must
float at this potential.
Figure 19 shows a typical
frequency response for the Voltage Program inpur.
Voltage programming is also possible in the
REMOTE PROGRAM
mode. When used in cambination with resistance programming, the resultant output is the sum of resistance and
"drag?? programming.
NOTE
Maximum input to voltage program input is
If an input greater rhan e15 volt is
t15v.
applied accidently,
the Model 227 o"fp"t CUTrent is internally
limited so as naf to exteed approximately 180% of full range. Recovery is automatic "he" the avervo1rage is
removed.
a.
(full
selects
of Model
Resistance Programming: Transfer function:
10%
of full range per kilohm (t0.5%).
Zero at approximately 11 kilahms.
Stability:
adds t(O.Ol%
of setting + 0.01% of =ange)/'C to Model 227 speResistance must be isolated and
c3xication.
shielded.
COMPLIANCE
ISMIT:
Closure* enables external co"External operate:
tral of both spa,, and limit.
Open enables 227
front-panel
control.
span Select:
Closure* enables compliance limit to
be set from 10 to 300 volts, open makes span 4
to 50 volts.
at 25'C 2 3'C
Compliance Limit Set: Resistance programmed, nonlinear transfer function, 00 yields high end of
span, 25kn yields approximately aid span, open
circuit yields low end. Resistance must be isolaced and shielded.
Flag (Output):
Logic "0" (xO.4V drop while sinking 16nA to external power supply LO) appears
when 227 is in compliance limit.
Logic "1"
(:>2.4V at up to 400,iA referenced to supply Lo)
appears when 227 is not in compliance limit.
REQUIRRECONTROL
LEVVELS:
*CLOSUREs closure to external power supply LO with
in 0.5 volt while sinking 5OmA(range-select
for
l-ampere range requires sinking lOOmA).
OPENz .2 kilohms referenced to external power
supply LO.
EXTERNALPOWER
SUPPLY: Requires external pawe=
supply of 5 to 6 volts @ 2ooaA.
CONNECTOR:DAM-15s type mounfs on 227 rear panel.
ACCESSORIES
SUPPLIED: Mating con*ecto=.
19
OPERATINGINSTRUCTIONS
MODEL227
TABLE 3-6.
Pin Out for Model 2271 Progr;
-Pin
No.
Functional
Description
Compliance Setting
Current Setting
Remote Program LOW
t5 Volts Power Supply Input
Compliance Limit Monitor
3-a.
HOW TO
6
7
8
9
10
lOmA Range set
1OOOmA
Range See
Compliance Limit
Compliance Setting
Current setting
11
12
13
14
15
Remote Program Low
+5 Volt common
10001lA Range Set
lOOmARange set
300V Compliance Set
RESISTANCEPROGRAM-COMP
RESISTANCEPROGRAM
-CURRENT
1000&4 = LO"
REMOTECOMPLIANCE
= LOW
I
RESISTANCEPROGRAM-COMP
RESISTANCEPROGRAM--CURRENT
"SE THE MODEL2271 PROGRAMMING
OPTION.
a. HOWto Make Connections.
When the Model 2271
is installed,
a 15-pi" connector is furnished on the
rear panel as shorn-i" Figure 21. A summary of pin
locaeions is given in Table 3-6.
1. Auxiliary
+5V Power Supply. The user must
furnish m external rmwer sumlv.
The sumh must
be capable of energizing a r&
coil with'ae"ominal 3.9V pull-in
voltage (at 20'0.
(Temperature
coefficient
is approximately 0.0133Vf'C up t" 50°C.)
A" additimal
0.2 ""lt
(10 at 2OOmA)drop should he
allowed for wiring plus up fo 0.5 volt drop for closure Co graund (when rbe relay coil is energized).
As a result,
a nominal +5V to +6" power supply
should be used depending on the individual
measurement circumstances (such as ambient temperature
.ZC.).
The external 5 volt supply musf be connecred between 5401 pins 4 (+) and 12 (common).
I
FIGURE 21.
For
the
Rear Panel Remote Programming Connector.
300"
Rcom WO =
2.
HO" to
4.
Pro~.ram
Set front
Compliance.
panel compliance t" minimum.
b). Determine the required compliance range,
either 50V or 300V. If 300V maximum compliance is
desired, c""nect pi" 15 to common (pi" 12). If
50V maximum compliance is desired, leave pin 15
unconnected.
Determine magnitude of compliance desired
4.
and select appropriate resistance from either of
the following relationships:
Compliance Range:
7.4
x 103 - 24.3
Ecom - 3.37
Ecom
For the SOVCompliance Range:
RcOm (kR) =
1.24 x LO3 - 24.3 EcOm
&ml - .56
where R,, is the programming resistor
is the compliance limit voltage.
and Scorn
d). After the resistance is connected between
pins 1 and 9, the" connect pi" a to coma" fo enable the remoee compliance control.
1174
I
MODEL 227
OPERATINGINSTRUCTIONS
1K
10K
PROGRAMMED
RESISTANCE-OHMS-
FIGURE 22.
1OOK
1M
10M
1OOM
10M
1OOM
Compliance Programming up to SOV.
ll
10K
1K
PROGRAMMED
RESISTANCE-OHMS-
FIGURE 23.
1174
1OOK
1M
Compliance Programming up to 3OOV.
21
OPERATING INSTRUCTIONS
MODEL227
PRO&RAMMEDRESISTANCE-
If resistance
exceeds 23kR, the
Model 227 will go
into current
limit.
Recovery is auto-
FIGURE 24.
Resistance Programming of current.
IMPORTANT
If pin 8 on the Rem"te Program connect"r is
not grounded, then the maximum compliance
limit will be determined by the front panel
Range Switch setting.
For example, if the
Range Switch is eet to 10 milliampere and
the current range is sef remotely on the
10 milliampere range (pi" 6 grounded), then
the maximum compliance voltage would be approximately 300 volts.
Hcwever, if the current range is sef remotely on the 1000 milliampere range (pi" 7 grounded), then the maximum compliance voltage would he approximately
90 volts rather than the 50 volts given in the
*pec1fic*ti0**.
As a result,
the current ~,aput would not have guaranteed regulation
for
compliance voltages beween 50 and 90 volts
on the 1000 milliampere range.
NOTE
When in external compliance (pin 8 = common),
if is possible to select 300V maximum on rhe
1 amp range which will result in compliance
voltages up to 9ov. Above 5ov compliance
voltage, the Model 227 may have excess noise
and poor stability,
and for this reason, the
50V maximum compliance should be selected
when on 1OOOmA
range.
22
3.
How to Use Compliance Limit Monitor.
This
output allavs the user to manitar whether or not
the Model 227 is in voltage limit mode. When the
compliance limit is reached, the front panel LIMIT
lamp will turn on and pin 5 on 5401 will be in low
state.
When LIMIT is "ON", pi" 5 will sink up to l&A
with no more than 0.4V drop. When the LIMIT is "OFF",
rhe high stare depends on the voltage level of the
user-furnished
5V pwer source (greater than 2.4V).
4.
How to Program the Current Control (nesistance Pro~ramminp). The magnitude of the current
O”tp”t
is a function
of the resistance connected
between pins 2 and 10 on 5401. The transfer function is given by the follaring
equation:
= (1.1 - Rp x lo-+)
x Full
Range
= resistance in ohms
F. = current in same units as rmge.
IO
also R = (1.1 Full Range Current ) x 104
NOTE
Set Polarity switch t" "+" to assure rated
accuracy.
Output accuracy for resistance
programming can be expressed as a 4 of full
range output 88 follows:
Rp - 11)
5: accuracy (full range) = +(0.5x [
] + 0.12%)
whe:IR
10
"here Rp = resistance
in kilohms
(103$,).
1174
REMOTE
PROGRAMMING
CONNECTOR
5401
TRIAXIAL
CABLE
BOX-WITHIN-BOX
CONFIGURATION
t------_I
f
CASE
1 GROUND
RESISTANCE BETWEEN540; PIN 10 AND CHASSIS OR
MODEL 227 LOW SHOULD BE AT LEAST 1012 OHMSTO
MAINTAIN ACCURACYTO WITHIN 0.005%.
ALSO, RESISTANCE BETWEEN5401 PINS 1 AND 9 SHOULD BE
GREATER THAN 109 OHMS.
FOT example, for full range output Rp = 21kO. and
% accuracy equals the following:
% accuracy
= ?(0.5%
r++
NOTE
n,e temperature coefficient
of the Model
2271 adds $(0.01% of setting/"C
+ 0.01%
of range/Y) to the Model 227 SpecificaThus the total Model 22712271 toetions.
fficient
could be expressed as 1-(*0.015%
of serting/oc
+ 0.015% of range/*C).
For
remote programing,
the temperature coefficient can be expressed as fOllOWS:
+ 0.12%:)
= 20.62% (of full range)
5. "ow to Program Range. Range can be set to
any of the four ranges by grounding the appropriate
line as shown in Table 3-7. TO use the Model 2271.
set the Range switch to REMOTEPROGRAM.
I
TABLE 3-7.
Remote Range Selection.
I
Condition of Lines
%T.C. (full
Ranae Desired 1Pin 6 1 Pin 7 1Pin 13 I Pin 14
1mA
OPEN OPEN
GND
OPEN
NOTE
When range changing, if all four pins are
open simultaneously,
the Model 227 will not
have a currenf output (output terminals are
open). To avoid relay arcing either program
the currenf back to zero or make-beforebreak the connections to the range lines when
changing range. If more than one pin is
closed, the higher current range is enabled.
For example, if all four pins are closed to
ground, the 1000mArange is selected.
Typical pull-in
time for all relays is 30 milliseconds. 'Qpical release time is 10 milliseconds.
1174
I
RX example, at a full
t.c.
I
range) = i-(0.015 [EP$-+
= to.o3%/?z.
range setting,
+ O.OlS)/"C.
the
6. Preferred Cabling Techniques.
Since the
Model 227 could be affected by excessive cable
capacity, a triaxial
cable (shield within a
shield) should be used with the inner shield
connected to pin 2 on 5401, and the outer shield
connected to CASE. Insulation
between shields
should be rated at 1000 volts especially
for
floating applications.
Box-within-a-box
cansrruction
should be used for all circuitry
used
in resistance programming.
NOTE
The maximum allowable capacitance berween
5401 pins 1 or 10 and chassis is 300pF unless compensating capacitance Cp is installed across the current programming resistor
Rp as follows:
Cp - [%C
- 1 x 1O-7l where R,, - load resistance
23
MODEL227
SECTION
4.
ACCESSORIES
Model 1008 Single Rack Mounting Kit.
Applications:
The Model 1008 adapts Keithley Style
Assembly Instructions:
"N" instruments for S-114 in. x 19 in. mounting with
1. Secure Half Rack Panel (Item 1) to Bracket
11 in. depth behind front panel.
The kit is also
Angle (Item 2) using two socket screws (Item 6).
useable with 14 in. depth instruments.
2.
Remove Side Dress Panels (left
and right) from
Parts List:
instrument.
Item
Keithley
3. Secure Bracket Angles (left and right) to inNO.
Description
Part No.
WY.
strument.
(Half Rack Panel may be located on the
1
Half Rack Panel
1
25815B
left or right to suit mounting requirements.)
Use
2
Bracket Angle
1
26757C
Phillips
Screws (Items 4 and 5) as shown in Figure
3
Bracket Angle
1
26794C
26 for 14 in. depth instruments.
Use longer screw
4
Phillips
Screws (5/g")
6
/B-32
(Item 7) and Kep nut (Item 8) for 11 in. depth in5
Phillips
Screws (l/Z")
4
#6-32
*trume*t* .
6
7
8
Socket
Screws
(318")
Phillips
Screws (5/V)
Kep Nut, #6-32
2
4
4
FIGURE
24
1110-32
116-32
86-32
26.
Model 1006 Single Rack Mounting Kit.
0975
THEORYOF OPERATION
MODEL 227
SECTION
5-l.
GENERAL. This section
5-2.
CumENT SOURCECIRCUITRY.
describe
cion.
a.
Lhe blade1
contains
227 and Model
Basic Power Supplies.
2271
5.
THEORY
information
circuit
to
opera-
(See schematic 26227D.)
1. Transformer Connections.
Line power is applied to the Model 227 via a 3-wire line c"rd (P306)
Power switch 5301 disconnects one side of line.
Fuse F301 protects the Model 227 from over-c"rre"t.
Line switches 5302 and S303 connect to tapped, primary windings on transformer T301 to suit the line
voltage available.
(See Specifications.)
2.
Pa* cannections.
The fan (B301) is connected to T301 primary windings ORNand BLK. The connection is made such that a nominal 117 volts is
always applied to the fan. When the Model 227 is
set for "LO" line operation (90 to 110 volts),
transformer T301 steps up the voltage (auta-rransformer action) to a nominal 117 Volts.
3.
LO" Voltage Supplies.
This supply is Powered
a) . *12v (VS supply).
byc~~ndy;fTLtaPPed secondary windings (GRN- YEL/
. Diodes CR306 and CR307 Prbvide a fullwave rectified
voltage of approximately 30 volts.
Integrated circuit
U302 is a series-regulator
which Provides a" output of +12 volts referenced
to "OVS". Resistors 8313 and R314 form a voltage divider.
Integrated circuit
0304 is a unitygain amplifier which regulates "OVS" with respect
q306
to -12 volts (-12VS). output tr*nsistors
to 4310 increase the current drive capability
of
u304.
112v (vc Supply).
This supply is powered
b).
by secondary windings TEL-YRL. The secondary
voltage is half-wave rectified
by diode CR305.
Integrated circuit U301 is a series-regulator
which provides a" output of +12 volts referenced
to "OVD". Amplifier U303 provides similarly
to
U302 as described in paragraph a) above.
4. High Voltage Supplies.
These supplies include an unregulated 86 volt supply and a unregulated 340 volt supply which is "piggy-backed" on
the 86 volt supply which when regulated together,
give a "et output of approximately 325 volts.
+86 Volt Supply. This supply is powered
4.
by secondary windings BLU-BLU. The seGondary
voltage is full-wave rectified
by diode CR304.
1174
OF
OPERATION
b). +325 Volt Supply. This supply is powered
by secondary windings RED-REDand XL"-EL".
The
secondary voltage
is full-wave rectified
by diode
bridge CR302. Divider network (R305, R306, and
R307) senses the +325 output and compares it to
the zener diode reference (CR303, R309). The
error voltage developed by differential
amplifier
q304 and Q305 is applied to driver transistor
Q3Ol and output transistor
q302. Resistor R304
is used to sense the current output of the 325"
S"PPlY. The voltage developed across R304 is
applied to q303 via divider R301 and R310. If
the Output current of the 325V supply increases
beyond approximately 18OmA. transistor
Q303 conducts and turns off transistor
Q301. Hence, the
output voltage of q302 IS decreased, causing a
fold-back current limiting
action.
When faldback occurs, the current is reduced to approximately 30 to 4OmAat a" output of approximately
86 volts.
If oyer-current
is present for greater
than 1.5 milliseconds,
full fold-back occurs.
I"
normal operation, the Model 227 should "of experience an over-current
condition beyond 500 microseconds, so that recovery is automatic.
A temporary overload condition can occur when the
Model 227 output is shorted (either by use of
OUTPUTSELECTORwitch or direct connection at
the output terminals).
Therm& Breaker. This them1 circuit4.
breaker ('X301) protects the Model 227 in the
event of excessive temperative rise.
The breaker
is designed to open at approximately 185OF.
b. Reference Amplifier Circuitry.
The output of
this circuitrv
urovides a stable +lV reference valtage for the &e"t
source regulator.
Integrated
circuits
U102 and "103 are summing amplifiers.
The
sener reference (CRllO) is switched by Polarity Switch
S105 to provide either +6.2V at the input of U103 (via
resistors R148, R128, and R129).
Feedback resistors
R150, R114, R115, Rl16, Rl30, R125, R126, and R127 are
selected by use of Decade Switches S102 and S103. The
output of U103 is varied from OV t" +4V (where 4V =
full range [10-O-O dial setting]).
Potentiometer R129
is a calibration
adjustment which adjusts the gain of
U103. The output of Ill03 is applied to U102 through
summing resistor R121. (Voltage programing is su*
med through R122 and R123. Capacitor Cl06 filrerr,
the voltage programming input to prevent slew-rate
limiting.)
The gain of U102 is set by resistors
R121
and RllV to provide a "et gain of 0.25 or an output
of 1 volt for full range (10-0-O).
25
THEORYOF OPERATION
MODEL227
HV
OHV
LINE
POWER
*12vo
VOLTAGE
PROGRAM
*12vs
L)
COMPLIANCE
REFERENCE
b
COMPLIANCE
CONTROL
Overall
VOLTAGE
CONTROL
COMPLIANCE
LIMIT
INDICATOR
(
FIGURE 27.
+
Block Diagram of Model 227.
is a bridgeC.
Bridge Current Source. This circuit
Integrated circuit
"205 and
confinuration
renularor.
associated circuitry
maintains-the
current output to
the dialed setting.
The output current is regulated
by comparing the voltage drop across the range resistor (R215, R216, R215, and R218) to the reference
amplifier
output (U102, pin 6). Any difference voltage causes a" output at U205 pi" 6 which drives output stages Q201 through Q208. A positive output current flows out of the RI terminal,
through the load,
and into a unity gain inverting
amplifier made up of
U206 and output stage composed of Q209 and Q212. The
action of the bridge output causes the voltage across
the load co be split evenly between the current
source and the unity gain inverting
amplifier.
This
configuration
permits a voltage swing from +300 volts
to -300 volts, using a single 300 volt supply.
2. Compliance Limit Circuitry.
The reference
voltage is applied to integrated circuit
"201, a
unity-gain;
non-inverting
amplifier.
The "utput
of U201 drives U202, a" inverting,
summing amplifier.
The outputs of U201 and U202 are equal and
apposite polarity.
These outputs are applied t"
U7.03 and U204, differential
transconductance amplifiers.
(Differential
transconducrance amplifiers
provide a" output current proportional
to the difference voltage at the input.)
The reference voltage is compared at the transconductance amplifier
inputs to divider outputs (R201, R202, R207, and
R208) which sense the voltage across the Model 227
When the output voltage of the
output terminals.
Model 227 reaches the Compliance Voltage Limit
(pre-set on the front panel or via the Model 2271),
any further increase in voltage causes the transconductance amplifiers
to "sink" or %ource" current through R117 and R213 via gating diodes CR111
(6-11, and 16-l), thus cancelling out the voltage applied t" U205. The COMPLIANCE
LIMIT Indicator DS104
is controlled by UlOlE and UlOlB. When both UlOlC
and Q102 turn off (for limiting
condition),
the action
causes the COMPLIANCELIMIT Indicator
to be lighted.
d. Compliance Control Circuitry.
This circuitry
controls the maximum compliance voltage which can be
developed on a give" range.
1. Compliance Reference.
Transistor
QlOl and
zener diode CR101 form a reference source which provides a constant-current
through potentiometer RlOl,
the front panel VOLTAGECOMPLIANCEcontrol.
The
voltage developed across RlOl is 9.12V on lOOOvA,
lOmA, and lOOmAranges; and 1.64V "n 1OOOmA
range.
26
e.
Miscellaneous
Circuitry.
1. Decimal Point Indicators.
Indicators DSlOl,
DS102, and DS103 are driven as part of the differential amplifier
(UlOlA, UlOlB) from the "-12VS"
and are selected by contacts on Range Switch SlOl.
1174
THEORYOF OPERATION
MODEL227
I
REF
I-
I
I
I
OUTPU
1 COMPLIANCE b
HI
FIGORF, 28.
Simplified
Diagram of Current
Source.
2. output Selector Switch (5104). This switch
disconnects the output terminals from the current
Section 3 for
SO"TCe. see operating Inser"ctio"s,
a discussion of switching.
When switch S107 is set, to x10, the current developed through Ml01 is a function of R133, R149,
R147, and &(M, where:
IM = VOUT i @, + RI33 + RI47 + R149)
3. Volts Monitor Circuit.
This output is provided by integrated circuit
U104, a unity-gain,
no"-inverting
amplifier.
This circuit
buffers the
voltage developed at the output 8" that no loading
error can result at RI and LO output terminals.
The atput of Volts Monitor is the same p"te"tia1
es Output HI and LO (up to 305 volts).
Since R143
and R144 provide source resistance of 10 kilohms,
loading of Volts M""it"r
should be take" in consideration.
Current Reading. When Switch S106 is set
b).
to "A", the meter is connected between 1~104output and “OVS”.
When Switch S107 is set ta, XI,
the current developed through Ml01 is a function
of R133 and s where:
1~ + Vm f (RM + Rl33)
4. Current Monitor Circuit.
This output provides -1 volt (km) for a + full range (10-0-O).
Fuse FlOl pr"tects
this ""tput against accidental
short circuits.
This voltage is developed between
the buffered o"tp"t of U104 and “OVSR”.
5. Meter circuit.
the outpa of U104.
Meter
Ml01 is driven
from
Reading. When switch S106 is set
a) . Voltage
to "V", the meter is connected between U104 output and output LO. The meter mO"eme"t is for
When Switch S107 is set to
full range reading.
XI, the current developed through Ml01 is a function of ~133, R145, R146, Rl47, and G, where:
(R145 + Rl46) R147
IM* VOUT i (R133 + 'k + R145 + R146 + R147)
0975
when Switch S107 is set to x10, the current developed through Ml01 is a function of R133, R149,
and RM where:
IM+vQI
i (RM+R133 +Rl49)
6. Power ON/OFF Transient Suppression Circuit.
This circuit
(located on board PC-396) minimizes
the effect of power surge when power to the Model
227 is applied "I‘ removed.
5-3.
PROGRAMMING
OPTION (MODEL2271).
a. Renee Prowamming. Range selectian is acconr
plished by energizing relays, (by closure to ground
or through a saturated transistor).
Relay coils
K401, K402, K403, K404, and K405 are connected to
the "8~8 external +5 volt supply (5401, pi" 4).
Closure to ground at 5401 pins 6, 7, 13, or 14 energizes the relay coils.
If the 1OOOmA
range is selected, relay K405 transfers
the ""fp~f
srage from 325
volt supply to 86 volt supply.
The user +5 v"lt
supply is switched by relay K408 which is energized
"hen the range switch is set to REMOTE.
27
MODEL227
THEORYOF OPERATION
b. External Compliance.
Closure to ground et 5401,
pin 8 enables external control.
When energized relay
K407 selects the External Compliance mode.
Complia"ce span. Closure to ground et 5401,
pii.
energizes relay K406. When energized, K406
sets the maximum compliance limit to 300 volts.
Contacts K406A set the compliance reference voltage
to 9.12 volts maximum. Contacts K406B change the
supply voltage et the output stage from 06 volts to
325 volts.
d. Current Setting.
(Resistance Programming).
Integrated circuits
U402 end U401 end zener diode
CR409 farm a 100 microampere reference current source.
The current source drives the external programming resistor connected between 5401, pins 2 end 10. The
voltage across the proSrammi"S resistor
(at the ~,aput of U401, pin 6) is fed to summing amplifier
U403
via resistor
R426. Diode CR409 end summing resistors
R411 end R412 form the reference voltage.
As
a result,
the output of U403 is es follows:
V, = (Rp x lOO,,A) - 1.1 valts
(See Section 3-8b4 for further discussion of this
transfer function.)
Clamping diodes DS401 end DS402
prevent the output of U403 from going to far negative
end enable FET switch Q402 to turn full off.
Transistors Q406, Q405, end Q407 are for overload protecti0*.
FET Switch Q402 is driven by both II406 end
9401.
When the Model 227 is switched out of "REMOTE
PROG”, (Range Switch 5101) transistor
Q401 turns off.
Transistor
Q403 turns on, turning off FET Switch Q402,
end as a result,
disconnects the remote program reference voltage from the Model 227. If the reference
voltage at pin 6 of U903 goes above approximately 1.2
volts, U406 turns an Q403 which turns off Q402 disabling the remote program reference to Model 227 ceusing the output to go to approximately
zero.
e. Compliance Limit Programming. Integrated circuit U404 is a summing amplifier.
Reference zener
diode develops a current through summing resistors
R405, R415, end R417 and program resistor
(5401 pins
1 end 9). Diode CR414 is a protection
device.
When
relay K406 is energized, the 9.1 volt reference voltage is selected by connecting the proper gain at U404.
f. Compliance Limit (FLAG). Transistor
Q404 (NPN)
is connected collector
to emitter between 5401 pins
5 end 12. When the Model 227 goes into compliance
limit phototransistor
U405 turns off, causing trensister
Q404 to
seturete
(low
state).
NOTE
Should it be necessary to ramove the Model
2271 Option from the Model 227 chassis, connector J206A, furnished with each 22712271
(show" on schematic 26226E) must be installed
et P206. Connector J206A is a te"-pi" Berg
Connector with jumper wires between pins A
end C: D end G.
28
0975
MAINTENANCE
MODEL227
SECTION
MAINTENANCE
6.
b. Line Voltage Setting.
Set the Line Switches
(5302 end 5303) in accord with paragraph 2-3 in Section 2.
6-1. GENERAL. This section contains information
necessary to maintain the instrument.
Included are
procedures for electrical
Performance Checks, Calibration, Troubleshooting.
c.
6-2. REQUIREDTEST EQUIPMENT. Recommendedtest
equipment for checking end maintaining
the instrument
is given in Table 6-1. Test equipment other then recommendedmay be substituted
if specifications
equal
or exceed the scared characteristics.
6-3. PERFORMANCE
VERIFICATION. Use the following
procedures LO verify proper operation of the instrument . All measurements should be made et ambient
temperature of approximately 25'C f. 3'C end relative
humidity below 60%. If the instrument is out of specification
at any point, perform a complete calibration as given in Paragraph 6-4. For each function
that is checked, an additional
uncertainty
due to
temperature coefficient
should be considered if the
ambient temperature is beyond the temperacure range
indicated above.
a.
Fuse Checks.
Preliminary
Check.
1.
Set OUTPUTSELECTORswitch
2.
Set Range Switch f" 1000uA.
3.
Ser Decade Switches to 10-0-O.
4.
Set Polarity
5.
Set METERSwitches f" "X10" end "A".
6.
Set VOLTAGECOMPLIANCEto "0" (minimum).
7.
Put External
8.
Set Power Switch to "ON".
9.
Set OUTPUTSELECTORto "ON".
10.
to "SHORT".
Switch t" "+".
short on Model 227.
Set VOLTAGECOMPLIANCEto 1OV.
1. Check the line fuse (F301) on the rear panel.
For nominal 117V line operation, use a 2.5A type
3AG Slo-Blo fuse. For 234V line operation, use a
1.25A type 3AG Sla-Blo fuse.
11. Observe Meter (MlOl) reading.
ing should be (+) full range.
2. Check the internally
installed
protection
fuse (FlOl).
This fuse is located on circuit
board
PC-330 near the front panel.
Remove the top c"ver
fo gain access to the circuit
board.
13. Observe meter (MlOl) reading.
should be (-) full range.
12.
Set Polarity
If the Line Fuse (F301) is blown or missing,
the Model 227 will be inoperable.
If the
protection
fuse (FlOl) is blown or missing,
the Model 227 will be operable, except the
rear panel Current Monitor end Voltage Programing rermi**1*.
0975
A
Digital
Voltmeter
B
Resisfence
C
Voltage
D
Resistance
source
BOX
Reading
for Range Settings
15. If all ranges are indicated correctly,
ceed to normal verification
pracedure.
I"PORTANT
The Model 227 vi11 not
either J206B (Used o"
missing.
To order en
specify Keithley Part
TABLE 6-l.
RecommendedTest Equipment for Performance Verification.
Description
to "-".
14. Verify Meter readings
t10, +lOO, and ~1OOti.
NOTE
Item
switch
Current read-
Minimum Specifications
l.OOOOOVi(O.OlS% of mg + 0.015% of rdg)
z1o*n input *
1OOR+ 0.01%. 0.12w 10ppm/Y
1kC ? 0.02%, 0.12W lOppm/'C
1on ? 0.022, 1w lOppm/'C
10 f 0.022, low 1oppm/*c
0 to UOVdc
0.01% of setting
tc c 3oppm/*c
* 0.002% of range
0 to 22kn f 0.02%
of
pro-
operate properly if
Model 2271) or J206A are
extra connector for J206A,
No. 272048.
Mfr.
Model
Keithley
190
Vishey
Vishay
v53-100
V53-1K
Fluke
34l.B
I
GR
14336
29
!
~
MODEL227
1.
If a check is
diately after
dial accuracy
voltage error
Dia.1 Accuracy (10-0-O).
4.
set. Range to lOmA.
b).
Set Decade Dials
to 10-O-O*.
c) . Connect Resisrmce
output of Model 227.
i(O.00449
(B), 1000 * 0.01% to
4.
d).
Connect DMM(A) across output
e).
Set COMPLIANCEto 1OV.
f) .
set OUTPUTSELECTORro "ON".
9).
set Polarity
h) .
Verify
of Model 227.
reading
set Polarity
j).
Verify
is l.OOOOOV
reading is l.OOOOOV
%f OUTPUTSELECTORf0 "SHORT".
b).
Set
2.
Did
Accuracy
(O-O-O).
a).
Set Decade Dials
b).
Set Polarity
Cl.
Verify
d) .
set
to O-O-O*.
Verify
+o.o012v.
e) .
3.
to
reading
reading
Perform steps 2a) through 269 above.
f).
Perform steps 3a) through 3e) above.
a).
Set OUTPUTSELECTORfo "SHORT".
b).
Set Range to lOOmA.
is 0.00000
b).
Set Polarity
Perform steps Id) through lj)
4.
Perform atepe 2a) through 2e) above.
f).
Perform steps 3a) through 3e) above.
is 0.00000
Cl.
Verify
to O-10-0*.
to W'.
that the voltage
reading
+o.o017v.
d) .
set Polarity
4.
Verify
to rY-9*.
thae rhe voltage
reading
is 0.10000
*o.o017v.
NOTE
Other dial settings
can be checked if desired.
Accuracy for all other settings should be
checked to allowable voltage error as fOllDWS:
+(o
C"rrenr + 0 0012)
_ . 005 x Dfa1ed
current Range
.
NOTE*
least
fully
30
significant
since dial
digit should be set careis a variable control.
e.
a).
Set OUTPUTSELECTORto "SHORT".
b) .
set Range to 1ooomA.
(B), 1R + 0.02% to our-
d).
Perform steps Id) through lj)
e) .
Perform steps 2a) through 2e) above.
f).
Perform ste,,s 3a) through 3e) above.
Voltage Program Verification
Set OUTPUTSELECTORto "SHORT".
2.
Set
3.
Set Decade Dials
Range
to
above.
(1000uA Range).
1.
1000pA.
4.
Connect Resistance
Model 227 output.
5.
above.
Dial Accuracy (1OOOmARange).
C). Connect Resistance
put of Model 227.
is 0.10000
(B), 1OQ t 0.02% to o"t-
d).
Dial Accuracy (0-10-O).
4.
above.
Dial Accuracy (lOOmA Range).
6.
Set Decade Dials
(B), lOOOn + 0.02% to
4.
nn-v'.
that voltage
lOOOvA.
Perform steps Id) through lj)
f0.0012V.
Polarity
to
Connect Resistance
4.
put of Model 227.
to "iJ'.
that voltage
Range
d) .
5.
iO.OO612V.
+ 0.00064)
a).
to nn-tl.
that voltage
Curre"r
Range
Dial Accuracy (lOOOvA Range).
+O.O0612V.
0.
x Dia1ed
current
Connect Resistance
4.
output of Model 227.
to "+I.
rhat voltage
made on dial accuracy imea complete recalibration,
rhe
should be checked LO allowable
as follo"s:
fo O-O-O.
(B), lOOOn f 0.02% to the
Connece DMM(A) across ourput of Model 227.
1174
MODEL227
6.
input.
MAINTENANCE
Connect Voltage Source (Cl fo VOLTS PROGRAM
h.
NOTE
Make certain that Voltage Source (0 is capable of floating
to +300". Also make certain
no connection is made between the Voltage
Source low terminal and chassis (CASE).
7.
Sef Voltage source (C) for +1ov OUtpUt.
8.
Set OUTPUTSELECTORto "ON".
9.
Verify
that reading an DMM(A) is l.OOOOOV
Voltane Program Verification
1.
Set OUTPUTSELECTORto "SHORT".
2.
See Range to 1OOOmA.
3.
227
Connect Resisfance
OUtpUt.
i.
ser Voltage source (C) for -lov
11.
Verify
*O.O06V.
12.
Verification
1.
13. Verify
*o.o01v.
hc
output.
reading on DMM(A) is 0.00000"
NOTE
If desired, other inpvt levels could be
checked. Output accuracy should be verified as follows:
Allovable Voltage error =
Voltage
$"rce (C) + o.ool)
t(o.005 x
NOTE
If verification
is performed immediately
after recalibration,
then output accuracy
should be verified
as follows:
Allowable
Voltage error =
+(o.oo441 x,Valtage source (C) + 0.001)
10
f. Voltage Proaram Verification
(lOmA Range).
1.
Set OUTPUTSELECTORto "SHORT".
2.
set Range to lOmA.
3.
227
4.
g.
Connect Resistance
output.
Repeat steps e5 through e13
Voltage Program Verification
(lOOmA Fanne).
1.
Set OUTPUTSELECTORto "SHORT".
2.
set Range co lOOmA.
3.
Connect Resistance
227 output.
4.
1174
Sef O"TP"T SELECTORfo "SHORT".
3.
Select the 1OOOuArange by closure
pin 13 to common.
4.
Disable the External
Of 5401 pin 8 to coma*.
5.
Set voltage
PANELCONTROL.
(B), lo,, ? 0.02% to Model
Repeat steps e5 through e13.
of 5401
Compliance by opening
compliance to 1OV "sing FRONT
6. Connect Resistance Box (D) to c"rrent
r&mming inputs at 5401, pins.2 and 10.
7. Set c"rrent for "zero" by'applying
ohma using Resistance Box (D).
8.
227
Connect Resistor
output.
9.
pro-
11 kll-
(B) lOOOn, 0.01% to Model
Conxvxt DMM (A) co Model 227 o"tp"t.
10.
Set OUTPUTSELECTORto "ON".
11.
Verify
that DMMreading is 0.00000 + 0.0012V.
12. Set current for "- full range" by applying
21 kilohms "sing Resistance Box (D).
13.
(B), 1OOC? 0.02% to Model
Option (Model 2271).
Set Range Switch to "REMOTEPROGRAM".
NOTE
2.
for 0 volts
of Programing
To guarantee specification,
rhe Model 2271
calibration
should be done with the Made1
227 polarity
switch in the "+" position.
output.
that reading on DMM(A) is l.OOOOOV
see Voltage source (0
(B), ln k 0.02% to Model
Repeat steps e5 through e13.
4.
kO.OO6V.
10.
(1OOOmARange).
Verify
that D"M reading is -1.00000 t 0.0062V.
14. Set current for "+ full range" by applying
1 kilohm "sing Resistance Box CD).
15.
Verify
that DMMreading is +l.OOOOO+ 0.0062V.
16.
Set OUTPUTSELECTORto "SHORT".
17. Verify other ranges. Select appropriate
range by closure 'COc"mn"n (pin 12).
Ra"p.Z
lomA
lOomA
1ooOmA
Repeat steps 17 through
Pi" Closure
pin 12 to pi"
pin 12 to pin
pin 12 to pin
116 for each
6
14
7
range selected.
31
MODEL227
MAINTENANCE
NOTE
CAUTION
Other settings of output current can be checked if desired by using the following
accuracy
relationship:
Allowable
Voltage error =
i(O.005 x 1% ;,'i
resistance
Extreme care should be taken eo avoid contact with voltages at various points on the
chassis when the line cord is connected.
IMPORTANT
;o:031 + 0.0012)
Follow the exact calibration
sequence since
many adjustments are interelated.
where Rp =
applied.
b.
If verification
is performed immediately
after recalibration,
the output accuracy
should be verified
as fallows:
Allowable
Voltage error
Fuse
Checks,
1. Check zhe line fuse (F301) on the rear panel.
For nominal 117V line operation, us8 a 2.5A type
3AG Slo-Blo fuse. For 234V line operation, use a
1.25A type 3AG Slo-Blo fuse.
=
+(0.00426 x 1% ;,'1; ;ol;03] + 0.00055)
2. Check the internally
installed
protection
fuse (FlOl).
This fuse is located on circuit
board
PC-330 near the front panel. Remove the top cover
to gain access to the circuit
board.
When the Model 2271 is to be used with the
Model 227, the Model 2271mw.t be installed
prior to calibration
af,the 227, since the
Model 2271 affects the Model 227 calibration.
Calibration
of the Model 227 should be performed prior to performing the Model 2271
procedure.
If the Line Fuse (F301) is blown or missing,
the Model 227 will be inoperable.
If the
protection
fuse (F101) is blown or missing,
the Model 227 will be operable, except the
rear panel Current Monitor and Voltage
Programming terminals.
NOTE
The reconrmended recalibration
period for the
Model 227 is 12 months from factory calibraticm.
If the complete calibration
is performed using equipment specified,
the Model
227 or Model 22712271 vi11 be usesble for an
additional
12 months within published speciIf repairs are made after initial
fications.
calibration,
the'complete calibration
proce
dures should be performed.
C.
Line
Voltage
d.
Preliminary
Setting.
(S302 and 5303) in accord with
tion 2.
5-4. ADJUS'lMENT/CALIBRATION
PROCEDURE.The follcwing adjustments should be performed when any specification
has been determined to be out-of-tolerance.
The Performance Check given in paragraph 6-3 should
be performed prior to this Calibration
Procedure.
If
any step in the Calibration
Procedure cannot be performed properly, refer to the Troubleshooting
Procedure (paragraph 6-5) or contact your Keithley repreAll measurements should be
sentative or the factory.
made at ambient temperature of 25'C f 3'C and relative humidity below 60%.
a. Chassis Assembly. To gain access to the adjustments in the printed circuit
boards, remove four
scre"* on TOP Cover and Bottom cover.
the Line Switches
paragraph 2-3 in Sec-
Set
Check.
1.
Set OUTPUTSELECTORswitch
2.
Set Range Switch to lOOO,,A.
3.
Set Decade Switches to 10-0-O.
4.
Set
5.
Set METER
6.
Set VOLTAGECOMPLIANCEto "0" (minimum).
7.
Put External
8.
Set Power Switch to "ON".
9.
Set OUTPUTSELECTOR to “ON.
10.
to "SHORT".
Switch to "+".
Polarity
Switches to "X10" and "A".
short on Model 227.
Set VOLTAGECOMPLIANCEto 10".
TABLE 6-2.
RecommendedTest Eaui~ment far Calibration.
*tern
32
E
Digital
F
0*ci110*c0pe
5mV/div. sensitivity
G
Digital
3-l/2
Voltmeter
Voltmeter
Mfr.
Model
of mg + 0.015% of rdg)
Keithley
190
lHRz bandwidth
Tektronix
---
Keithley
168
Minimum Specifications
Description
l.OOOOOV
t(O.OlS%
digits,
0 * lOOOV, 20.2% of rdg
1174
MAINTENANCE
MODEL 227
Current read-
Observe Meter (MlOl) reading.
11.
ing should be (+) full range.
12.
Set Polarity
14. Verify Meter readings
*lo, t100, and ?lOOOmA.
NOTE
To keep the
sinks, place
227, offset
justments.
could cause
which could
Reading
for Range Settings
If all ranges are indicated correctly,
15.
ceed to normal verification
procedure.
of
1. Set controls as indicated
(except "a external short).
in paragraph 5-3~
2. Remove the Model 227 top cover and bottom
cover.
potentiometer
R306 on circuit
Connect DVM (Item G) between +325V
and 0 W test point.
4.
5. Adjust potentiometer
ing of +325” + 1V.
board
test point
R306 far a voltage
read-.
Remove top and bottom covers.
2.
Connect DVM (G) to output.
3.
Set Decade Dials
4.
Set Polarity
5.
set VOLTAGECOMPLIANCEto maximum.
6.
Set OUTPUTSELECTORto "ON".
7.
set Range to 1ooomA.
a.
Adjust
f 0.3v.
+55v
9.
If thermal breaker TX301 is open or faulty,
no voltage reading can be made.
10.
2.
watt)
connect
to output
kilohm resistive
terminals.
a 30
load (l%, 10
(Item F) across the re3. Connect Oscilloscope
sisrive load to monitor the compliance voltage.
Oscilloscope must be ac coupled.
4. Set the front panel VOLTAGE COMPLIANCEcontrol (RlOl) to maximum (fully
clockwise).
5.
Set Range Switch to "lOOmA".
6.
Set Decade Dials
7.
Set OUTPUTSELECTORSwitch to "ON".
to 1-O-O.
R220 fully
10. Adjust potentiometer
tions to zero.
11.
DO step 8 to insure
R102 for a" output
of
to 11-1'.
Check output voltage
12.
set Range to 1oOmA.
13.
Set Polarity
Adjust
2 1v.
to I'+".
potentiometer
15.
Set Polarity
16.
Check output voltage.
RI.04 for a" output of
to "-'I.
17. Readjust potentiometer R104 on that polarity
with the lowest absolute value of voltage for i(305V
'1V).
18. Repeat steps 11 through 17 until all readings are within tolerance.
NOTE
clockwise
before
R220 to reduce oscillano oscillation
Switch to "f".
potentiometer
set Polarity
14.
+305v
Polarity with highest voltage does "or have
to be within the 55 _+0.3V or 305 ? 1V. But
should be no greater than 58 or 320.
a. Adjust the VOLTAGECOMPLIANCEcontrol (RlOl),
until compliance Limit indicator
(05104) just lights
(monitor oscillation
on scope).
9. Set potentiometer
performing step 10.
to 10-10-10.
11. Readjust potentiometer R102 o" that polarity
&&;V;"'
lowest absolute value of voltage for f(55V
Bias Adjustment.
1. Set controls as indicated in paragraph 5-3c,
steps 1 through 8 (except no output short).
occurs.
12. Monitor voltage across R225 (0.39ff2) should
be O.O12V, no more than 0.01%'.
0975
1.
NOTE
f.
correct air flow across the heat
the top cover (loose) on the Model
just enough to gain access to adOtherwise internal
power dissipation
excessive temperature variation
void the calibration.
pro-
Power Supply Adjustment.
3.
hcate
PC-331.
50V and 300V Compliance Adjust.
Switch to "-I'.
13. Observe meter (MlOl) reading.
should he (-) full range.
e.
g.
h.
Current
Zero Adjust.
1.
Connect a 1000 resistive
2.
Set Decade Dials
3.
set Range to 1omA.
CCW.)
load to output.
to O-O-O*.
(set R124 fully
33
MODEL227
MAINTENANCE
4.
Cmmecf DVM (E) across outpur load.
5.
Set OUTPUTSELECTORCO "ON".
4. Connect DVM (E) acro8s VOLTS MONITOR(HI-LO),
on rear panel.
6. Set Polarity
reading.
to "+'I and take note of voltage
7. Set Polarity
reading.
to "-" and take note of voltage
8. ndjust potentiometer R118 so that the absoluee
value of the voltages in steps 6 and 7 are within
lO,," of each other.
"I = Blue (3105)
LO = Black (J106)
6. Adjust potentiometer
o.oooov + o.oao1v.
k.
NOTE
Output polarity
should change opposite
Polarity Switch settings.
9. Set Fine Control
fully).
to
R124 far O-O-5 (set 5 care-
10. D"M (Item E) should read 0.005V 2 O.OOOlV
if not, So to step 11. If vithin
tolerance, go to
Section 6-Pi below.
NOTE
Set OUTPUTSELECTORto "SHORT" between measuremenrs.
11. loosen knob an Fine Conrrol and align knob
to "5" position (without disturbing
potenfiometer
setting).
NOTE
Do not disturb
i.
R124 setting
set Range to lOmA.
2.
Set Decade Dials
Meter Calibration.
1.
Set OUTPUTSELECTORto "SHORT".
2.
Set Decade Dials
3.
Adjust mechanical
4.
set Decade Dials
5.
set Range to lOmA.
6.
Set METERSwitch to Xl and A,
7.
see Polarity
8.
SBL OUTPUTSELECTORto "ON".
9.
Adjust potentiometer
set
10.
to O-O-O.
zero as necessary.
to 1-o-o.
to "+".
R133 for full
Polaricy
to
“-“.
12.
Set Meter Switch to X10 and A.
13.
Set Decade Dials
to 10-0-O.
by alternately
14. Check both polarities
ing Polarity Switch to "+'I and "-".
to 10-O-S.
15. Check to see the meLer error
than =5x.
switch-
is no greater
6-5. MODEL2271 ADJDSRIRNTICALIBRATION. Wdel
2271 Installed
in Model 227).
4.
Connect D"M (E) across output
5.
set VOLTAGECOMPLIANCEto 10.
a.
6.
Set OUTPUTSELECTORto "ON".
7.
set Polarity
8.
Monitor output
1. connect external +5v Supply at 5401 pin 4
(+5V) and pin 12 (common). External supply should
be rated at +5" to +6" at 200 milliamperes.
NOTE
Calibration
of the Model 2271 must be done
with Model 227 Front Panel Polarity
Switch
in "+" position to insure meeting specification.
b. Current Source Ad,"st.
to "4'.
voltage
9. AdJust potentiometer
1.0050" I' 0.00017".
,,.
Volts Monitor
terminals.
range (lo)
11. Readjust potentiometer R133 so that error
between f and - polarity
is equal.
of "5".
3. Connect a 100 ohm (O.Ol%, lOppm/'C, l/SW) resistive load to the output.
34
I(135 for an Output of
readmg.
Full Range Current Calibration.
1.
Set OUTPUTSELECTORto "ON".
5.
of DVM.
RI29 for an output Of
Zero Adjust.
1.
Set Decade Dials
to O-O-O.
2.
set Range to lomA.
3.
connect short *cross output.
Power supply Connections.
1.
Connect test set-up as shown in Figure 29.
2.
Set Range to Remote ProSraminR.
3. connect 5401 pin 6 to pin 12 (common) GOenable 1OmArange.
1174
MAINTENANCE
MODEL 227
4.
Monitor voltage across 1kC resistor
D"M (A). Voltage should be approximately
using
10&&V.
e. Iterative
Curtent Cal/Zero Adiust.
Repeat
steps c and d until both conditions are satisfied.
NOTE
5. Adjust potentiometer R438 as necessary so
that voltage across resistor is the same with switch
closed or open (readings to be within UOpV).
C.
Resistance Pronram Zero Adjust.
1.
See 227 Polariry
Switch to "+".
2.
Connect a llkn resistor
tween 5401 pins 2 and 10.
(0.02X, 1/4W) be-
connect a loon resistor
Model 227 output terminals.
(O.Ol%, 112W) *t
3.
4.
tive
5.
Co~ect D"" (A) across resistor
range).
d.
(most sensi-
Turn OUTPUTSELECTORSwitch to "ON".
6. Adjust potentiometer
ing is 0.00000 t ZOOVJ.
Current Cal. (- Full
R412 so that DVMreadRange).
1. Co,,r,e~r a 21kO resistor
t"een 5401 pins 2 and 10.
(0.022,
2. Connect a 1000 resistor
terminals.
at Model 227 output
3.
Connect D"M (A) across resistor.
4. Adjust potentiometer
u" reading at output.
1174
Set the Zero Adjust (R412) in opposite polarity
an equal amount to error 80 that interation will converge with fewest number
of operations.
If potentiometer R407 does
not allow sufficient
adjustment range.
jumper across R406 may have to be cut or
reinstalled.
114W)
be-
(1V Range.)
R407 for -1.00000 C 150
f.
Current Verification
(+ Fvll
Range).
1. Connect a lk0 resistor
5401 pins 2 and 10.
(O.OZ%, 1/4W) between
2. Connect a 100 resistor
terminals.
at Model 227 output
3.
connect DVM (A) *cros*
resistor
(1V range).
4.
Check to see that output on DVM (A) is
+l.OOOOO t 55OvV reading at output.
5.
8.
Set SELECTORSwitch to "SHORT".
Ext. Compliance Limit
1.
connect 3401 pin 8 to pin 12 (common).
2.
Remove connections
10 (leave open).
3.
(Maximuml.
between 5401 pins 2 and
connect DVM (A) at Model 227 output.
35
MAINTENANCE
4.
MODEL227
Cannect.5401 pin 15 to pin 12 (common).
CAUTION
Up to 300 volts is present at various rear
panel cermina1s a* well es internal
circuit points.
5.
Connect 5401 pin 1 to pin 9.
6. Connect a 1kR resistor
pins 2 and 10.
(0.02%) beween 3401
7.
Set OUTPUTSELECTORSwitch to "ON".
8.
Record voltage
reading at output.
9. Connect a 21kn resistor
(0.02%) between
5401 pins 2 and 10. (Remove 1kR resistor).
10.
Compare reading of srep 9 to that of step 10.
11. Select resistor value (1kR or 21kn) which
gives the lowest (absolute value) reading.
12. With this resistor
installed,
adjust potentiometer R405 for a reading of 305V t 1V.
a.
in Model
Power Supply Check.
1. Connect external+12
volt supply (needed only
for check-out purposes) to printed circuit
board
PC-342.
Connector
5405 pi" F should be +12" with
respect to pin B. Connector 5405 pi" E should be
-12V with respect to pin B.
2. CD”“ect
exCer”al
+5V supply to connector 5401
pin 4, (+SV) end pin 12 (cormon). External supply
should be rated at +5V to t6V et 200 milliamperes.
b. Relay Check. (An ohmmeter is required for this
check to verify open circuit
and short circuit
conditions . )
NOTE
Connect
5404 pin B fo 12V common (5405,
pi"
B) co energize relay K408. This action conneccs the +5V supply co Model 2271 circuitry.
1.
Remote Compliance Limit
(Relay K407).
13.
Set OUTPUTSELECTORSwitch to "SHORT".
Momentarily connect 5401 pi" 8 to pi" 12
(+kmo"~
to energize K407.
14.
Remove connection
15.
Set OUTPUT SELECTORSwitch to "ON".
b). Check condition of relay
G and D using a" Ohmmeter.
16.
Output voltage
17.
Set OUTPUTSELECTORSwitch to "SHORT".
2.
18.
Remove connection
Momentarily connect 5401 pin 15 to pin I.2
4.
(common) to energize
K406.
h.
at 5401, pi" 15.
should read 55V _C 2V.
between 5401 pins 1 and 9.
Ext. Com~llance Limit
(Minimum).
1. Connect a lkn resistor
and 10.
5401
pin
15 to
Connect DVM (A) across output.
12.
is made between
4.
Sef OUTl’“T SELECTORSwitch to "ON".
5.
Voltage at output should be lass than 9"
(positive).
Connect 21kO resistor
and 10.
Compliance Range (Relay K406).
c) . Contacts should close (zero resistance)
when closure to comma,,is made.
3.
6.
3OOV
resistance)
pin
Connect
volts
c) . Contacts should open (infinite
when closure to commonis made.
et 3405
Check condition of relay
b).
K end H "sin8 en Ohmmeter (H).
2.
Make certain M connection
5401 pins 1 and 9 (open).
confects
between J401 pins 2
NOTE
between 5401 pins 2
7. Voltage et output should be less than 9V
vo1rs (negative).
8. Repeat steps 2 through 7 with 5401 pi" 15 not
connected to pi" 12. "c&age reading should be less
then k3.5V.
36
6-6. MODEL2271 CHECKOUT
(Not Installed
227).
d) . Check condition of relay
pins 5 and 6 or across R419.
contacts
contacts
et 5405
at K406A
Resistance
should change from 00 to approx4.
imately
20kQ when closure to cocaon is made.
Leave 5401 pi" 15 to pi" 12 connected for
f).
next test.
3.
1OOOmA
Range (Relays K404, K405, end K406).
a).
Momentarily
connect
3401
Check condition of relay
b).
K and H "sin8 an ohonnerer.
pin
7 and
contacts
Contacts should open (infinite
4.
when closure to commonis made.
pin
12.
at 5405
resistance)
d) . Check condition of relay contacts
pin K and pi" C using a" Ohmmeter (B).
at 5404
1174
MAINTENANCE
MODEL227
b). Check condition
pin K and A.
f).
Remove connections between pins 7, 12, and
15 before proceeding to next step.
4.
c.
a). Momentarily mnnecf 5401 pin 14 to pin 12
(common) fo energize relay K403.
of relay
contacts
Current through the 312Q resistor
should be
16mA. Set the +5 volt supply to achieve the
C"lTC2*t.
2. Voltage between 5401 pin 5 and pin 12 should
(Leave resistor
connected for
be less than f0.4V.
next seep.)
3. Connect a 3600 resistor
(5X, 1/2W) between
5406 pin A and 5405 pin F (+12V supply).
at 5404
4. connect a jumper wire between 5406, pin B to
5405, pin B (12V common).
c) . Contacts should close (zero resistance)
when closure to commonis made.
6.
Check.
NOTE
a). Momenrarily connect 5401 pin 6 to pin 12
(comon) to energize relay K402.
of relay
Compliance Monitor
contaces at 5404
1OmARange (Relay K402).
b). Check condition
pin K and E.
at 5404
1. Connect a 312Q resisror
(5%. 1/2W) between
5401 pin 5 and pin 4 (+5V supply).
Contacts should close (zero resistance)
cl.
when closure to cormnonis made.
5.
contacts
C). Contacts should close (zero resistance)
when closure to common is made.
lOOmARange (Relay K403).
b).
Check condition
pi" K and F.
of relay
5.
1OOOpARange (Relay K401).
Voltage at 5401 pin 5 should be greater
than
+2.4V.
a). Momentarily connect 5401 pin 13 to pin 12
(common) to energize relay K401.
6.
Disconnect
resisrors
and jumper.
NOTE
Should it be necessary to remove the Model 2271
Option from the Model 227 chassis, con,,ector
J206A. furnished with each 22712271 (shown on
schematic 262263) must be ins&led
at P206.
Connecror J206A is a ten-pin Berg Connector
with jumper wires between pins A and C; D and G.
0975
37
MAINTENANCE
MODEL227
FIGURE 30.
F1Gw.E 31.
38
Location
Location
of Adjustments with Top Cover Removed.
of Adjustments with Bottom Cover Removed.
1174
REPLACEABLE
PARTS
MODEL227
SECTION
7.
REPLACEABLE
for
7-1. GENERAL. This section contains information
ordering replacement parts.
The parts list is arranged in alphameric order af their Circuit Designations.
7-2. ORDERINGINFORMATION. To place an order or to
obtain information concerning replacement parts, contact your Keithley representative
or the factory.
See
the inside front cover of the manual for addresses.
When ordering, include the following information:
a.
Insfrument: Model Number
b.
Instrument
C.
Part Description
d.
Circuit
e.
Keithley
1174
Serial
Designation
Number
(if
applicable)
7-3.
PARTS
SCHmTIC IlI*GRAMs.
a, Power Supply (26227D). This schematic describes the line-operated
power supply, including
fuses, fan, and thermal circuit-breaker.
Circuit
designation series 1s "300".
b. Current Source (262263). This schematic describes the range switching,
regulating amplifiers,
reference amplifier,
and other controls.
Circuit
designation series is "100" for Switch Board, PC-330
and "200" far Mother Board, PC-331.
C. Model 2271 Programming Option (266083). This
schematic describes the controls for range, current,
Circuit designation series is "400".
and compliance.
Stock Part Number.
39
REPLACEABLE
PARTS
MODEL227
TABLE 7-1.
PC Board Desiznnatian Series
Series
100
200
300
400
Description
Page No.
Designation
Switch Board
Amplifier
> Mother Board
Power Supply
Remfe Programming Circuit (Model 2271)
PC-330
PC-331
PC-331
PC-342
52
54
54
57
TABLE 7-2.
Mechanical Parts List
Item No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
40
Description
Chassis Assembly
Front Panel Assembly
Front
Scr&,
Panel
Slotted, 6-32 x 318
Front
Panel Overlay
Rear Panel
Side Extrusion Left
Side Extrusion Right
Corner Bracket
Screw, Socket, 6-32 x l/4
Screw. Phillips,
6-32 x l/4
Clip for Side Dress
Side Dress Panel
Top Cover Assembly
Top Cover
Screw, Socket, 6-32 x 5116
Bottom Cover Assembly
Bottom cover
Screw, Socket, 6-32 x S/16
Feet Assembly
Feet
Ball
Tilt Bail
Screw, Phillips,
6-32
Kep Nut, 6-32
Qty. Per
Assembly
Keithley
Part No.
1
92
25565C
4
1
1
1
1
2
4
4
2
2
FA-101
255608
t
25787B
1
4
25566C
25568B
26000C
25899C
25555B
25564B
25563B
4
4
24322B
FE-6
1
17147B
4
4
32
32
1174
MODEL227
REPLACEABLE
PARTS
FIGURE 32.
1174
Chassis Assembly.
41
MODEL227
REPLACEABLEPARTS
TABLE 7-3.
Cross-Reference of Manufacturers
AWE”.
42
Name and Address
ALCO
Alto Electronics
Products,
Lawrence, MA. 01843
A-B
AliRE”.
Inc.
Name and Address
GRIFF
Griffith
Allen-Bradley
Corp.
Milwaukee, WI. 53204
HOW
Howard Industries
Racine, "I.
53404
AMMON
Ammo*Instr"me"ts,
1°C.
Manchester, NH. 03105
IEE
Industrial
Electric Engineers,
"an Nuys, CA. 91405
AMPRX
Amperex
Elkgrove Village,
IEC
International
Long Island,
BECK
Beckman Instruments, Inc.
Fullerton,
CA. 92634
IRC
IRC Division
Burlington,
IA.
BELD
Belden Manufacturing Co.
Chicago, IL. 60644
LITF"
Littlefuse,
Inc.
Des Plaines, IL.
BERG
Berg Electronics,
Inc.
New Cuberland, PA. 17070
MAL
Mallory capacitor
Indianapolis,
IN.
46206
CENLB
Centralab Division
Milwaukee, WI. 53201
MOLBX
Malex
Duners Grave, IL.
60515
CLARO
Clarostat Manufacturing
Dover, NH. 03820
MOT
Motorola Semiconductor Products,
Phoenix, AZ. 85008
COMPI
Components, Inc.
Biddeford, ME. 04005
NAT
National Semiconductor Corp.
Danbury, CN. 06810
c-w
Continental-Wirt
Electronics
Philadelphia,
PA.
POTT
Potter Company
weeson, MI. 39191
CTS
CTS corporation
Elkarc, IN. 46514
RCA
RCA COrpOration
Somerville, NJ.
DALE
Dale Electronics,
Inc.
c01umbus, NB. 68601
SOL
Solitron Devices, Inc.
Tappan, NY. 10983
DELCO
Delco Electronics
Div.
Kokomo, IN. 46901
SPRAG
Sprague Electric Company
Visalia,
CA. 93278
DICK
Dickson Electronics
Corp.
Scottsdale, AZ. 85022
SUPER
Superior
Bristol,
ED1
Electronic Devices Inc.
Yonkers, NY. 10710
s-c
Switchcraft,
IDC.
Chicago, IL. 60630
ERIE
Erie Technological
Erie, PA. 16512
FAIR
Fairchild
Instruments Corp.
Mountain View, CA. 94040
TEPRO
Tepro
Clearwater,
FUSE
Fusetran (Bussman Mfg. Div.)
St. Louis, HO. 63107
TEXAS
Texas Instruments
Dallas, TX. 75231
G-E
General Electric
Company
Syracuse, NY. 13201
THERM
Therm-O-Disc., Inc.
Mansfield, OH. 44907
IL.
60007
Co., Inc.
Products,
Carp.
Inc.
TK!fPL
Temple
Tecate,
Plastic
Electronics
NY 11746
Inc.
Corp.
52601
60016
In
08876
Electric Co.
CN. 06012
CA. 92080
FL.
33517
1174
REPLACEABLE
PARTS
MODEL227
REPLACEABLE
PARTSLIST
(Schematics 26226E,and 26227D3)
CAPACITORS
Mfr.
Code
Mfr.
Deslg.
Keithley
Part No.
t .
COMPI
COMPI
ERIE
CO&PI
COMPI
AMPFS
ERIE
ERIE
CENLB
ERTE
CENLB
ERIE
TD2-20-106-20
TD2-20-106-20
8?1-Z5UO-103M
TDl-20-475-20
TD2-20-106-20
C2SOAE/PlOOK
8?1-25UO-103M
871-ZSUO-103M
DD-101
ml-zwo-203M
DD-221
S?l-25UO-103M
C1?9-10M
C179-10M
C22-O.OlM
C179-4. JM
C179-10M
C178-0.m
c22-o.olM
C22-O.OlM
C64-100P
C22-0.02M
C64-220P
c22-o.olM
7
..
4
5
..
1
..
..
1
1
1
..
CENLB
CENLB
ERIE
ERIE
ERIE
SPRAG
SPRAG
2
..
1
2
.
2,
..
1
..
..
.
2
1
.
.
.
.
.
.
.
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.
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.
.
.
.
.
*..
COMPI
COMPI
CENLB
IEC
COMPI
COMPI
ERIE
CENLB
CENLB
CENLB
POTT
POTT
CENLB
DD-220
C64-22P
DD-220
C64-22P
8131050651334M C23?-0.33M
811-Z5"0-2O3M c22-0.0%
811-ZSUO-203M c22-0.02M
loss-D22
C64-0.0022M
C64-0.0022M
lOSS-D22
lOSS-D47
C64-0.0047M
...
...
TDl-20-475-20
C179-4.7M
TDl-20-475-20
c179-4.7M
DD-101
C64-1OOP
CM4?0-6A
C220-0.047M
TDl-20-475-20
C179-4.7M
TDl-20-475-20
C1?9-4.7M
80800025RO-102K C64-O.OOlM
DD-471
C64-47OP
DD-471
C64-470P
DD-471
C64-47OP
SMlA-0.1uF
c73-0.l.M
SMlA-O.l"F
C?3-0.m
DD-101
C64-1OOP
.
.
.
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.
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*
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MAL
G-E
CENLB
POTT
TmL
COMPI
COMPI
TE+PL
COMPI
COMFI
AMPRK
COMPI
TC?S-20@
86F183M-940uF
DD-681
SHIA-O.luF
411-4?0,,F
TD2-20-106-20
TDZ-20-106-20
411-470pF
TD2-20-106-20
TDZ-20-106-20
C280AEIP47K
TDl-20-226-20
1
1
1
..
2
..
..
..
.
.9
1
1
Description
Cl01
Cl02
Cl03
Cl04
Cl05
Cl06
Cl07
Cl08
Cl09
Cl10
Cl11
Cl12
lOvF, 2OV, ETT. . .
lOuF, 20", ETT. . .
O.OluF, 5OOV, CerD.
4.?uF, ZOV, ETT . .
IOpF, 20". ETT. .
O.lliF, ZSOV, MtF. .
O.OluF, SOOV, CerD.
O.Ol!lF, 5oov. cerIl.
lOOpP, 1000". CerD.
0.02uF. 5OOV. CerD.
220pF, IOOOV, CerD.
O.OW, SOOV, CerD.
.
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c201
c202
C203
C204
C205
C206
C207
C208
c209
c210
CZll
c212
C213
c214
c215
C216
c217
C218
c219
c220
c221
c222
22pF, lOOOV, CerD .
22pF, lOOOV, CerD .
0.33uF, 5OV, CerF .
O.OZuF, 50OV, Gem.
0.02~F, 5OOV, CerD.
0.0022uF. lOOOV, Cerll
0.0022uF. 1OOOV.CerD
0.0047uF. 1OOOV.CerD
Not U&d: . . .'. . .
4.?uF, 2OV, ETT . . .
4.?uF, 20", ETT . . .
lOOpF, lOOO", CerD. .
O.O4?,,F, 6OOV, MPF. .
4.7@, ZO", ETT . .
4.7uF. 20". ETT . . .
O.OOl,,F, lbOOV, CerD.
47OPP, lOOOV, cem. .
4?0PF, 1000", CerD. .
470pF. 1000". CerD. .
O.lvF, 4OOV;My . . .
O.lpF, 4OOV, My . . .
100pF, 1000", CerD. .
.
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*
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.
c301
C302
c303
c304
c305
C306
c307
C308
c309
c310
C311
C312
2OpP, 450". ETB . .
940pF, lOOV, FAL. .
680pF, lOOOV, CerD.
O.luF, BOOV,My . .
4?0uF, 50", FJ& . .
1O,,F, 20", ETT. . .
lO,,F, 20V. ETT. . .
470°F. 50". FAL . .
lO,,F, 20V;ETT. . .
lO,,F, 2OV, ETT. . .
O.O4?vF, 250". MtF.
22,iF, ZOV, ETT. . .
. .
.
.
. .
. *
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. .
. .
. .
. .
. .
* .
0178
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CB-20
C239-940M
C64-6SOP
c73-o.lM
C246-47OM
C179-10M
C1?9-10M
C246-470M
C1?9-1OM
C179-1OM
C178-o.o4?M
C179-22M
..
1
3
.
.
3
..
..
43
MODEL22,
REPLACEABLEPARTS
DIODES
Mfr.
Code
CR101
CR102
CR103
ml04
CR105
ml06
ml07
CR108
ml09
ml10
CR111
CR112
CR201
CR202
CR203
CR204
CR205
CR206
CR207
CR208
zener, 2.6V ...
Re,Ctifi6&', ?h& 75v.
....................
R‘JCtifieI,
%& 75', .................
Rectifier,
7.%& 7%. ................
Rectifier,
75!& 75V. ................
RBCtifier,
75mA. 75V. ................
zener,
5.b
. :.
: : : : : : :
. . * . . . . .
.
.
.
,
.
.
.
.
.
.
.
.
.
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.
.
.
.
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.
.
*
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*
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.
.
.
.
.
.
.
.
.
.
.
.
.
,
.
CR210
CR211
CR212
zener, 5.8V . . . . . I . . . .
zener, 5.m . . . . . . . . . .
zener, 6.3V, 250 m" . . . , . .
zener, zov, 2w. . . . . . . . .
zener, zov, 2w. . . . . . . . .
Rectifier,
75.d. 75v. . . . . .
Rectifier,
75x& 75V. . . . . .
Rectifier,
75mA, 75V. . . . , .
Rectifier*
.75mA. 75v. . . . . .
..Rectifier;
3A, iOV (lN4139)
Rectifier,
75mA, 75v. . . . : :
Rectifier,
75wA. 75v. . . , , .
.~~
Not Used.........................
Rectifier,
75mA, 75V. ................
Rectifier,
75ti, 75V. ................
Diode Network .................
Diode Network .................
CR301
CR302
CR303
CR304
CR305
CR306
CR307
Four-diode, full-wave bridge, ZA, 1OOV. ......
Four-diode, full-wave bridge, l.SA, 400V. .....
zener. 24V, 0.25W .................
Rectifier,
3A, 400V ................
Rectifier,
lb., 8oov ................
ReCtifieI,
l& 8oov ................
Rectifier,
IA, ROOV................
:
.
.
.
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*
TEXAS
TEZAS
TEXAS
TEXAS
TEXAS
TEXAS
DICK
DICK
DICK
M-S
DICK
DICK
TEXAS
TEXAS
TEXAS
TEXAS
SOL
TEXAS
TEXAS
.. .
TEXAS
TEXAS
FAIR
FAIR
Mfr.
Desig.
lN702A
lN914
lN914
lN914
lN914
lN914
lN706
l&706
lN706
lN827A Selected
ZEZZOD5
ZEZZOD5
lN914
lN914
lN914
lN914
3A50
lN914
lN914
...
~lN914
lN914
FSA2619M
FSA2619M
Keithley
Part No.
t .
DZ-33
RF-28
RF-28
RF-28
RF-28
RF-28
DZ-1
DZ-1
DZ-1
286198
DZ-52
DZ-52
RF-28
RF-28
RF-28
RF-28
RF-34
RF-28
RF-28
...
RF-28
RF-28
DN-2
DN-2
1
13
..
..
..
..
3
..
..
1
2
..
*.
..
..
..
1
..
..
..
..
..
2
..
ED1
EDI
DICK
ED1
MOT
MOT
MOT
PD-10
PF-40
lN723
RABo40
4006
4006
4006
RF-36
RF-46
DZ-17
RF-47
RF-38
RF-38
w-38
1
1
1
1
3
..
,.
Mfr.
Code
Mfr.
Desig.
Keithley
Part No.
t .
IEE
IEB
IEE
IEE
7345-AS25
7345-AS25
7345-AS25
7345-8825
PL-57
PI.-57
PL-57
PL-57
4
..
..
..
Mfr.
Code
Mfr.
De&.
Keithley
Part NO.
t .
DISPLAYS
circuit
De+%.
DSlOl
DS102
DS103
DS104
Description
pilot
pilot
pilot
pilot
Lamp,
Lamp,
Lamp,
Lamp,
6V.
6V.
6V.
6V.
..................
..................
..................
..................
FUSES
Description
FlOl
F"BB, 0.125A, SAG . . . . . . . . . . . . . . . . . .
LITFD
361.125
Fu-5
F301
F301
~"ee, 1.25A, 25OV, 3AG, SLO-BLO (234V). .......
Fuse, 2.5A, 25OV, 3AG, SLO-BLO (117V) ........
FUSE
FUSE
MDX-1.25
MDA-Z.5
FU-28
FU-45
Mfr.
Code
Mfr.
Desig.
Keithley
Part No.
t .
POM
PO"
POM
POM
PGM
2854-4
2854-9
2854-6
2854-9
2854-6
BJ-9-4
BJ-9-9
M-9-6
BJ-9-9
BJ-9-6
1
2
2
..
..
1
CONNECTORS
no1
5102
5103
5104
no5
44
~*nena
banana
Banana
*mana
~~,,ana
Jack,
Jack,
Jack,
Jack,
Jack,
Yellow ................
White. ................
Blue .................
White. ................
Blue .................
0178
REPLACEABLEPARTS
MODEL227
CONNECTORS
(Cont'd)
Circuit
Desig.
5106
5107
J108
J109
.I110
Jlll
5201
5202
5203
3204
5205
5206
5207
5301
5302
5303
5304
5305
5306
Banana
Banana
banana
banana
banana
Banana
Jack,
Jack,
Jack,
Jack,
Jack,
Jack,
Black. .........
Red. ..........
Black. .........
Red (Modified BJ-9-Z). .
Black (Modified BJ-9-O).
Green (Modified 85-9-S).
musing, lo-pins.
..........
See Model 2271. ...........
'dousing, Z-pins, MINI-PV. ......
Not Used. ..............
Housing, 10 pins. ..........
Housing, lo-pins.
..........
See Model 2271. ...........
Housing, )-pins, MINI-PV. ......
musing, lo-pins.
..........
Housing, z-pins ...........
Housing, lo-pins.
..........
Rousing, S-pins, MINI-PV. ......
Line Cord, 3-wire, Sft., gray vinyl
PlOl-111 Not Used. ..............
P201
P202
P203
P204
P205
P206
P207
P301
P302
P303
P304
P305
P306
lo-pins ...............
lo-pins ...............
z-pins. ...............
Not Used. ..............
lo-pins ...............
lo-pins ...............
lo-pins ...............
3-pins ................
lo-pins ...............
Plug. z-pins. ............
lo-pins ...............
5-pins ................
Line Receptacle ...........
........
........
........
........
........
........
........
........
........
........
........
........
........
........
........
........
........
........
. ........
Mfr.
Code
Mfr.
Desig.
Keithley
Part No.
POM
POM
POM
POM
POM
POM
2854-O
2854-2
2854-O
2854-2
2854-O
2854-5
BJ-9-O
BJ-9-2
BJ-9-0
BERG
...
BERG
...
BERC
BERG
...
BERG
BERG
MOLEX
BERG
BERG
BELD
20052
CS-237
I..
CS-266
...
CS-237
CS-237
...
CS-270
CS-237
CS-275
CS-237
CS-251
co-7
. . . . . . . .
*..
........
........
........
........
........
........
........
........
........
........
........
........
........
KI
KI
KI
...
KI
KI
KI
KI
KI
65039-035
...
20052
20052
65039-034
20052
2139-2
20052
65039-040
Special
..*
...
. ..
...
...
...
...
. ..
...
2402-2A
...
EAc301
274848-Z
274848-O
274848-S
e .
2
1
..
1
1
1
5
..
1
..
..
..
..
1
..
1
..
1
1
. *.
..
242498
24249A
242498
I..
24249A
242498
242498
242498
242498
CS-277
2424911
24249A
CS-254
10
10
2
..
10
10
10
1;
1
10
5
1
TUNSISTORS
Circuit
Desig.
QlOl
0102
PNp,
PNp,
Q201
Q202
NPN, Case
6203
Q204
9205
Q206
Q207
9208
Q209
9210
.Q211
Q212
9301
6302
Q303
4304
Q305
6306
9307
1075
Mfr.
Desig .
Keirhley
Parr No.
FAIR
FAIR
2N5139
2N5139
TG66
TG-66
2
RCA
DELCO
FAIR
MOT
2N3439
DTS-409
2113565
2N5190
2N5193
2N4355
DTS-409
285416
283439
285416
DTS-409
DTS-409
TG-93
3
5
4
2
2
1
..
2
..
..
..
..
Code
NPN,
NPN,
NPN,
PNP.
PNP,
NPN,
PNP,
PNP,
PNP,
NPN,
NPN,
Case
Case
TO-106. . . . . . . . . . . . .......
TO-106. . . . . . . . . . . . .......
TC-5. . . . . . . . . . . . .
Power Type, 3.5A, lOOW, TO-3 Case.
Case TC-106. . . . . . . . . . . .
Power Type, Case TO-220. . . . . .
Power Type, 4OW, 4A, Case TO-220 .
Case TO-106. . . . . . . . . . . .
Power Type, 3.5A, lOOW, TO-3 Case.
Power Type, lA, lOW, Case TC-5 . .
Case TO-5. . . . . . . . . . . . .
Power Type, lA, lOW, Case TO-5 . .
Pcver Type, 3.5A, lOOW, TC-3 Case.
Power Type, 3.5A, lOOW, TO-3 Case.
NPN, Case TO-5. . . . . . . . . . . . .
NPN, Power Type, 3.5A, lOOW, TO-3 Case.
NPN, Case TO-106. . . . . . . . . . . .
NPN, Case TO-106. . . . . . . . . . . .
NPN, Case TO-106. . . . . . . . . . . .
PNP, Power Type, &A, 4OW, Case TO-220 .
NPN, Power Type, 4A, 4OW, Case TO-220 .
.......
.......
.......
.......
.......
.......
.......
.......
.......
.......
.......
.......
.
.
.
.
.
.
.
.
.
.
.
.
.
.
MOT
FAIR
DELCO
RCA
RCA
RCA
DELCO
DELCO
*
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+
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*
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.
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RCA
DELCO
FAIR
FAIR
FAIR
MOT
MOT
2313439
DTS-409
2~3565
2N3565
2~3565
2N5193
2N5190
To-113
TG-39
TG-108
TG107
TO90
TG113
To105
m-93
TO105
TO113
TC-113
TO93
TG-113
TO39
TG39
TG-39
TG-107
TO108
t .
..
..
..
..
..
..
..
45
REPLACEABLEPARTS
MODEL227
RESISTORS
Circuit
Desis.
RlOl
R102
R103
R104
RIO5
RlO6
R107
RlOS
Rlo9
RllO
RJ.11
R112
RI13
R114
Rl15
R116
R117
R118
R119
R120
R121
R122
R123
R124
R125
R126
R127
Rl28
R129
R130
R131
R132
R133
R134
R135
R136
R137
R138
R139
Rl40
R141
P.l42
R143
R144
R145
R146
R147
R148
R149
8150
R151
R201
R202
R203
R204
R205
R206
R207
R208
R209
R210
R211
R212
R213
R214
46
Description
5kC, Var. ...........
ZOkR, Cermet. .........
3.3kn, lo%, 0.25W, Camp . : . .
lkR, Cermer ..........
499il. 1%. 0.12W. MeF. .....
5.6kti, lb%, 0.25W, Cmp . . . .
1370, l%, O.SW, MtF . . . . . .
1000, 10%. 0.25W, Camp. . . . .
l.Skn, lo%, 0.25W, Camp . . , .
lkn, lo%, 0.25W, Cm,, . . .
.
3.9kQ, lo%, 0.25W, Camp . . . .
lOOR, lO%, 0.5w, camp .
loon, lO%, o.sw, corn* .
12oot7, 0.1%. O.lZW, MtF ...............
SOOR, O.l%, O.lZW, MtF.
4000, O.l%, O.lZW, MtF.
lkn, lo%, 0.25W, Camp .
lOkn, Cennet. . . . . .
lkn, 0.1X, O.lZW, MtF .
8200, 10%. O.ZSW, Camp.
4.02k0, l%, O.lZW, MtF.
6.5kQ, O.l%, O.l2w, MtB
2.5k0, O.l%, O.lZW, MtP
500, Cermet . . . . . .
12on. 0.5%. 0.12w.. Mm.
800, 0.5%, O.lZW, MtF .
4002, 0.5%. O.lZW, MtF .
1.69k0, 1%, O.IZW, MtF.
1kR. Cermet . . . , . .
160& O.S%, O.l2W, MtF. ...............
6813, 1X, 0.5W, MtF . .
681n. 1%. O.SW. MtF . .
SOOn; C&met. : . . . .
100, lO%, 0.5w, camp. .
lOOk0, Cemet . . . . .
lMQ, 10X, O.ZSW, Camp ,
lOOka, lo%, 0.25W, Camp
lOOkR, lo%, 0.25W, Camp
lkn, 10%. 0.25W, Camp .
Not Used
l.Skn, lo%, 0.25W, Camp
S.ZkC, 10X, 0.25W, Camp
8.2k0, lo%, O.ZSW, Camp
l.Skn, lo%, O.ZSW, Camp
66.5kR, l%, O.SW, MtF .
66.5kn, l%, 0.5W, MtF .
l.ZlM& 1%, 0.5W, MtF .
4.02k0, l%, O.l2W, MtF.
3.57kn. 1%. 0.12W. MtF.
16000. 0.1%. 0.12W. MtF
lkn. 0.1%. 0.12W. MtF .
249kn, l%, O.SW, MtF. .
249kn, 1X, 0.5W, MfF. .
33kn, lo%, 0.25W, Camp.
3.3kR, 10%. 0.25W, Camp
3.32kn. 1%. 0.12W., MtF.
3.32k0, I%, O.l2W, MtF.
7.68k0, 1X, O.lZW, MtF.
7.68k0, l%, O.l2W, MtF.
3.3kn, 104, 0.25W, Camp
33k0, lo%, 0.25W, Camp.
3300, lo%, 0.25W, Camp.
33On, lo%, O.ZSW, Camp.
Z.Zkn, 10X, 0.25W, Camp
z.zkn, lO%, 0.25w, camp
................
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
................
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
...............
.
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*
*
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*
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*
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,
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. . *
. .
. . .
Mfr.
Code
Mfr.
Desig.
CLARO
BECK
A-B
BECK
IRC
A-B
IRC
A-B
A-B
A-B
A-B
A-B
A-B
DALE
DALE
DALE
A-B
BECK
DALE
A-B
DALE
DALE
DALE
47-5kn
RP105-5K
RP89-20K
89P-2OkQ
R76-3.3K
CB-332-10%
RP89-lK
89P-lkQ
R-88-499
CEA-TO-499
CB-562-10%
R76-5.6K
R94-137
CEC-TO-137Q
CB-101-10%
R76-100
R76-1.5K
CB-152-10%
R76-1K
CB-IOZ-10%
R76-3.9K
CB-392-10%
Rl-100
ED-101-10%
ED-101-10%
Rl-100
MFF-l/S-T212000 Rl76-1200
MFF-l/8-TZ-8000 R176-800
MFF-l/8-TZ-400n R176-400
R76-1K
CB-lOi-10%
RP89-10K
89P-10kR
R168-1K
MFF-l/8-lk0
CB-821-10%
R76-820
MFF-l/8-T94.02kRR177-4.02K
MFF-l/8-TZ-6.5K R176-6.5K
MPF-l/8-T22.5kO R176-2.5K
RP106-50
550-5on
R234-120
MFF-l/8-120Q
R234-80
MFF-l/8-80!?
R234-40
MFF-l/8-40n
MFF-l/8-1.69kR
R206-1.69K
89P-lkn
RP89-1K
mF-1/8-16on
R234-160
R94-681
CEC-TO-681n
CEC-TO-681n
R94-681
89P-5003
RP89-500
Rl-10
ED-lOO-10%
RP89-100K
89P-100kR
R76-1M
CB-105-10%
R76-100K
CB-104-10%
R76-100K
CB-104-10%
CB-102-10%
R76-1K
1
2
1
2
1
1
1
1
1
3
1
2
..
1
1
1
..
..
2
1
2
1
1
1
1
1
1
1
1
1
2
..
..
1
1
1
2
..
..
R76-1.8K
CB-182-10%
R76-8.2K
CB-822-10%
R76-8.2K
CB-822-105:
R76-1.8K
CB-182-10%
CEC-TO-66.5kQ R94-66.5K
R94-66.5K
CEC-TO-66.5kn
R94-1.2l.M
CEC-TO-1.2l"P
MFF-l/8-T94.02kRRl77-4.02K
CEA-TO-3.57kR R88-3.57K
MFF-l/8-T21600R Rl76-1600
R-168-lk
MFF-l/8-1kQ
R94-249K
CEC-TO-249kn
R94-249K
CEC-TO-249kn
R76-33K
CB-333-10%
R76-3.3K
CB-332-10%
CEA-TO-3.32kQ R88-3.32K
RSS-3.32K
CFA-TO-3.32kn
R88-7.68K
CRA-TO-7.68kn
CEA-TO-7.68kR R88-7.68K
R76-3.3K
CB-332-10%
R76-33K
CB-333-105:
R76-330
CB-331-10%
CB-331-10%
R76-330
R76-2.2K
CB-222-10%
R76-2.2K
CB-222-10%
2
2
.*
..
2
..
1
..
1
1
..
2
..
2
4
4
..
2
..
..
..
2
..
2
..
CTS
DALE
DALE
DALE
DALE
BECK
DALE
IRC
IRC
BECK
A-B
BECK
A-B
A-B
A-B
A-B
A-B
A-B
A-B
A-B
IRC
IRC
IRC
DALE
IRC
DALE
DALE
IRC
IRC
A-B
A-B
IRC
IRC
IRC
IRC
A-B
A-B
A-B
A-B
A-B
A-B
Keithley
Part No.
f .
0776
REPLACEABLE
PARTS
MODEL227
RESISTORS(Cont'd)
circuit
Desiyz.
Description
R215
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
R231
R232
R233
R234
R235
R236
R237
R238
R239
R240
R241
R242
R243
R244
soon, O.l%, lW, MfF . .
90R, 0.1%. 0.25W. MtF . .
9% O.l%, 5w. ww. . .
.
1n, 0.1%. low, WW.
. .
68k0, 10%. 0.25W, Cap. .
loon, O.5W, "a= . . .
.
6818, l%, 0.5W, MtF . . .
681n, 1X, 0.5W, MtF . . .
1.5k$,, 10%. 0.25W, Camp .
470, 10X, 0.25W, Camp . .
0.39G. 5%, 2w, ww . . . .
0.39n, 54, 2w, ww . . . .
47n, lo%, 0.25W. Camp . .
1.5kn, 10%. 0.25W. Camp .
820~. 10%. 0.25W, Camp. .
15On, lo%, 0.25W, Camp. .
1500, 10%. 0.25W, Camp. .
IkR. 1%. 0.5W, MtF. . . .
1.5!b, iO%, 0;25W, Come .
Ikn, 1%. 0.5W. MtF. . . .
3.3kR, 10X, 0.25W. Come .
333k0, 1%. 0.5W, MtF.
.
3.32kn, I%, O.l2W, MtF. .
10kn, IO%, 0.25W, Come. .
3.32kn, 1%. O.lZW, MfF. .
333wl, 14, 0.5W, MtF. . .
3.3kR. 10%. 0.25W. Comu .
333kfi, 1%;0.5W, I&. : .
lOOn, lo%, 0.25W, Camp. .
1000, lo%, 0.25W, Camp.
......
......
......
......
......
......
......
......
......
......
......
......
......
......
......
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R301
R302
R303
R304
R305
R306
R307
R308
R309
R310
R311
R312
F.313
R314
P.315
F.316
R317
. .
5.49kn. 1%, O.l2W, MtF.
. .
lOOksI, 10X, ZW, Camp. .
. .
1.5ksI, lo%:, 0.25W, Come
. .
ZOR, 5%. 2w, ww * . 9 .
. .
32.4kn, 1X, O.lZW, MtF.
. .
10kn, 0.5W, "as . . . .
464kn, l%, 0.5W, MtF. .
* .
. .
lOOk0, 10%. lW, Camp. .
47kn, 10%. 2w, camp . *
. .
* .
464kn, 1X, 0.5W, MtF. .
. .
lOkD, 10%. 0.25W. ComP.
. .
10kR. 10%. 0.25W, ComP.
16.63k0, O.L%, O.lZW, MtF ..............
16.63kn, O.l%, O.l2W, MtF ..............
loks, 10X, 0.25W. Camp. ...............
68$,, 10%. 0.25W, Camp ................
68n, 10X, 0.25W, Camp ................
......
......
......
......
......
......
......
......
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9
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Mfr.
Code
Mfr.
Desig.
Keithley
Part NO.
TEP
RCL
TEPRO
TEPRO
A-B
BECK
IRC
IRC
A-B
A-B
IRC
IRC
A-B
A-B
A-B
A-B
A-B
IRC
A-B
IRC
A-B
IRC
IRC
A-B
IRC
IRC
A-B
TRC
A-B
A-B
TS-I
7009
TS5-9*
TSlO-10
CB-623-10X
72PMR-1OOQ
CEC-TO-681n
CEC-TO-681n
CB-152-10%
CB-470-101
BWH-ZW-.39Q
IN"-2W-.39s,
CB-470-10%
CB-152-10%
CB-821-10%
c8-151-10%
CB-151-10%
CRC-TO-lk0
CB-152-10%
CEC-TO-lkn
CB-332-10%
CEC-TO-333kn
CEA-TC-3.32kn
CB-103-10%
CF.A-TO-3.32kn
CEC-TO-333kO
CB-332-10%
CRC-TO-333kn
CB-IOl-10%
CB-lOl-10%
R249-900
R95-90
R232-9
R231-1
R76-68K
RP97-100
R94-681
R94-681
R76-1.5K
R76-47
RZOl-0.39
R201-0.39
R76-47
R76-1.5K
R76-820
R76-150
R76-150
R94-1K
R76-1.5K
R94-1K
R76-3.3K
R94-333K
R88-3.32K
R76-10K
R88-3.32K
R94-333K
R76-3.3K
R94-333K
R76-100
R76-100
.
..
1
2
..
2
..
..
..
3
..
4
..
..
..
..
2
..
IRC
A-B
A-B
IRC
IRC
BECK
IRC
A-B
A-B
IRC
A-B
A-B
DALE
DALE
.4-B
A-B
A-B
CEA-TO-5.49kn
HB-104-10%
CB-152-10%
BWn-2w-20*
CF.&TO-32.4kn
72PNblOkn
CEC-TO-464kO
GB-104-10X
HB-104-10X
CEC-TO-464kn
CB-103-10%
CB-103-10X
MPF-l/8-16.63kn
HFF-l/8-16.63kn
CB-103-10X
CB-680-10X
CB-680-10X
R88-5.49K
R3-100K
R76-1.5K
RZOl-20
R88-32.4K
RP97-10K
R94-464K
R2-100K
R3-47K
R94-464K
R76-10K
R76-10K
R176-16.63K
R176-16.63K
R76-10K
R76-68
R76-68
1
1
.*
1
1
1
2
1
.l
..
..
..
2
..
..
2
..
Mfr.
Mfr.
Keithley
_rare .NO.
.
- -LEE
1
1
1
1
1
1
2
4
2
2
SWITCHES
Cir.Xlit
De&?.
SlOl
s102
5103
s104
s105
S106
s107
%
5302
s303
0178
De*crlpti.On
Range, Rotary Type. . . . . .
current, x100, Rotary Type. .
Current, X10, Rotary Type . .
Output Selector, Rotary Type.
Switch, Slide, DPDT . . . . ,
Switch. Slide. DPDT . . . . .
Switch. Slide. DPDT . . . . .
LO (Ground-Flost)
SPST
Switch, Toggle, StDT. . : : :
Switch. :DPDT. . . . . . . . .
sviec :h, DPDT. . . . . . . . .
“CZSLg.
.
.
.
.
.
.
.
:
.
.
...........
...........
...........
...........
...........
...........
...........
...........
...........
...........
...........
KI
KI
KI
KI
s-c
s-c
S-C
c-w
ALCO
c-w
c-w
SW-360
SW-363
SW-363
SW-361
SW-365
46206LR
SW-394
XW2776
SW-394
XW2776
SW-392
SW-236
isa%sT
GG350PC-DPDT SW-318
GG350PC-DPDT SW-318
...
...
BYi
1
2
..
1
I
2
..
..
1
2
..
47
REPLACEABLEPARTS
MODEL227
INTEGRATEDCIRCUITS
Circuit
Desk.
Description
UlOl
no2
U103
U104
Transistor Array, 1Cpin DIP. . . .
Operational Amplifier,
8-pin DIP. .
Operational Amplifier,
8-pin, TO-99
Operational Amplifier,
8-pin, TO-99
. . .
. . .
Case.
Case.
.
.
.
.
U201
u202
U203
U204
u205
U206
Operational
Operational
Operational
Operational
Operational
Operational
, . .
. . .
Case.
Case.
. . .
. . .
.
.
.
.
.
.
u301
U302
u303
U304
12V ReRulator,
Case TO-220.
. . . . . . . .
12V Regulator, Case TO-220 (*Selected IC-60)
Operational Amplifier,
S-pin DIP. . . . . .
Operational Amplifier,
8-pin DIP, . . . . .
Amplifier,
Amplifier,
Amplifier,
Amplifier,
Amplifier,
Amplifier,
8-pin
8-pin
S-pin,
S-pin,
8-pin
8-pin
DIP. ,
DIP. .
TO-99
TO-99
DIP. .
DIP. .
,
.
.
.
.
.
.
.
.
.
.
.
Mfr.
Code
Mfr.
Desig.
Keithley
Part No.
t .
RCA
FAIR
NAT
NAT
CA3086
Special
LM308H
LM308H
IC-53
IC-77
X-67
X-67
1
1
2
..
NAT
LM307N
LM307N
CA3080
CA3080
Special
LM301AN
IC-61
IX-61
IC-91
IC-91
IC-76
IC-24
2
..
2
..
1
1
UGH7812393
IC-60
U9T7741393
2
..
2
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
NAT
RCA
RCA
FAIR
NAT
9
.
FAIR
.
.
9
.
*
.
FAIR
FAIR
UGH7812393
*26839A
FAIR
U9T7741393
IC-42
IC-42
Mfr.
Code
Mfr.
De&g.
Part
HOW
3-90-8010
FM-l
Special
FN-2
ME-96
TR-148
1
1
36T21
TB-1
1
..
MISCELLANEOUS
Circuit
D.ZQ.
B301
Ml01
T301
TK301
----_
__-
48
Description
Fan, 105CFM, 115V, 60 Hz, 19W ..........
Meter, 250uA, linerar movement .........
.Transfomer
...................
Thermal Breaker, SPST, Open: 185'F, Closed: 135'F
Dial,
Dial,
Dial,
Dial,
Knob,
snob,
for
for
for
far
far
far
selector switch 5102. . . . . .
selector switch 5103. . . . . .
output control R124 . . . . . .
Range Switch SlOl . . . . . . .
Output Selector Switch 5104 . .
Voltage Compliance Control RlOl
.
.
.
.
.
.
.
.
.
.
.
*
AWHON
KI
THERM
. .
. .
.
.
.
.
.
.
.
.
KI
KI
KI
KI
KI
KI
--
_---
--
Keithley
No.
qtr.
257818
25781.A
257838
25785A
2515lA
251518
0975
KEPLACEABLE
PARTS
MODEL22,
CiXT"iE
Desig.
c501
C502
c503
Parts Located on PC-396 (See Schematic 272660
CAPACITORS
Mfr.
Mfr.
Code
Desig.
Description
TD2-20-106-20
corn1
lOF,20V,ETT
. . . . . . . . . . . . . . . . . . .
TDl-20-474-20
CONPI
0.47 F, 2ov, ETT . . . . . . . . . . . . . . . . . .
co*1
TDl-20-475-20
4.7 F, 2OV, ETT . . . . . . . . . . . . . . . . . . .
Keiehley
Part NO.
C-179-1OM
c-179-0.47M
C-179-4.7M
WY.
..
1
..
DIODES
CR501
CR502
CR503
CR504
CR505
Rectifier,
Keithley
Part NO.
RF-28
RF-28
RF-28
RF-28
RF-28
KI
KI
Mfr.
Desig.
........
........
Keirhley
Part No.
24249A
24249A
Mfr.
Code
INTSL
INTSL
INTSL
INTSL
Mfr.
Desig.
ITE4392
SELECTED
ITE4392
IT34392
Keithley
Part NO.
Mfr.
Code
Keithley
Part No;
R-76-lM
R-76-100K
R-76-l&!
A-B
Mfr.
Desig.
CB-105-10X
CB-104-10X
CB-105-10%
CB-821-10%
CB-104-10%
CB-104-10%
CB-105-10'6
CB-105-10X
CB-102-10%
Mfr.
Code
BERG
BERG
Mfr.
Desig.
65039-040
65039-040
. . . . . . . . . . . . . . . .
75!& 75V . . . . . . . . . . . . . . . .
75luA. 75v . . . . . * . . . . . . . . . .
TEXAS
TEXAS
DeSCKiptiOU
Rectifier,
Rectifier,
Rectifier,
Rectifier,
Mfr.
Desig.
lN914,
lN914
lN914
lN914
lN914
Mfr.
Code
TEXAS
circuit
Desig.
75mA, 75v
75m.A. 75V
JSmA, 75V
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
TEXAS
TEXAS
QtY.
..
.
..
..
..
CONNECTOKS
CirCUit
Mfr.
Code
Description
De&g.
5-pins........................
5+ns..............
P501
P502
* . . . . . . . . .
t .
..
.
TRANSISTORS
circuit
Desig.
q501
N-Ghan
N-Chan
N-Chan
N-Chan
4502
Q503
q504
JPET,
JFET,
JFET,
JPET,
Case
Case
Case
Case
RllO.
RllO.
RllO.
P.llO.
...............
...............
...............
...............
TG77
QtY.
4
..
..
TG-77
..
27283A*
TG-77
RESISTORS
CirC"it
Desig.
R501
R502
R503
R504
R505
R506
R507
R508
Ii509
Description
lMn, lo%, 0.25W, Camp ................
lOOkn, lo%, 0.25W, Camp ...............
lMQ, 10X, 0.25W, Camp ................
820kn, 10X, 0.25W, Camp ................
lOOkn, 10X, 0.25W, Camp ...............
lOOk& 10X, 0.25W, Camp ...............
lMn, 10X, 0.25W, Camp ................
IMQ, 10X, 0.25W, Cap ................
lkR, IO%, 0.25W, Cap ................
A-B
A-B
A-B
A-B
A-B
A-S
A-B
A-B
Qfy.
..
..
..
1
..
..
R-J6-820K
R-76-1OOK
R-J6-100K
..
R-J6-lM
R-76-lM
R-76-1K
..
..
CABLES
cbmxtt
nesig.
J501
5502
Description
connector,
Con"ector,
musing,
Housing,
5-pins
5-pins
. . . . . . . . . . 1 . .
. . . . . . . . . . . . .
Keithley
Part No.
CS-251
CS-251
t .
2
..
NOTE
Cables J501 and 5502 connect between PC-396 and PC-331 as shown on schematic 272&X.
through P216 are located on PC-331 (See schematic 27266C and 266263).
0975
Connections
P208
49
MODEL2271
REPLACZABLEPARTS
CAPACITORS
Circuit
Desig.
c401
C402
c403
c404
c405
C406
c407
loom. 1ooov. CerD.
33pk;lOOOV;CerD
.
O.lvF, 25OV, MtF. .
1.2@, 2OV, ETT . .
1,2pF, ZOV, ETT . .
0.33UF, 5ov, CerF .
O.Ol@, 5oov, CerD.
Description
...........
. .
Recrifier~, 75mA, 75V. .
. .
...........
Rectifier,
75mA, 75V. .
...........
. *
Rectifier,
75mA, 75V. .
...........
. .
Rectifier,
75mA, 7%. ,
. .
. .
. .
Rectifier,
75mA, 75V. .
. .
. *
. .
Rectifier,
75mA, 75V. .
. .
. .
. .
Rectifier,
75mA, 75V. .
Rectifier,
75,& J5V. ................
............
Zeaer, 6.2V, lJ4W (Selected).
Rectifier,
75mA, 75V. ................
izener, 5.8V .....................
Rectifier,
lA, 800V .................
Rectifier,
75mA, JSV. ................
2ener, 15v. .....................
Circuit
Desig.
5401
5402
5403
5404
5405
5406
5407
P401
P402
P403
P404
P405
P406 1
. .
. .
. .
. .
. .
. .
DISPLAYS
circuit
DeSig.
DS401
DS402
. . . . . . . . . . . . . . . .
. .
. .
. .
. .
. .
.
. .
. .
. .
. .
* .
.
. .
. .
. .
. *
. .
.
. .
. .
. .
. .
. .
.
. .
. .
. .
. .
.
.
. .
. .
. .
. *
. .
.
DIODES
circuit
De&g.
CR401
CR402
CR403
CR404
CR405
CR406
CR407
CR408
CR409
CR410
CR411
CR412
CR413
CR414
.
.
.
.
.
.
.
Description
LED, 2V, 4OmA(red) .................
LED, 2V, 4OmA(r.ed) .................
*Selected from Keithley PL-61
i
Mfr.
Desig.
Keithley
Part No.
f .
CENLB
CENLB
AMPRX
corn1
corn1
ERIE
ERIE
DD-101
I)D-330
C280AEfPlOOK
TDl-20-125-20
TDl-20-125-20
8131050651-33413
871-ZSUO-103M
C64-1OOP
C64-33P
ClJ8-0.1
c179-1.2M
c179-1.2M
C237-0.33M
c22-o.om
1
1
1
2
..
1
1
Mfr.
Code
Mfr.
De&.
Keithley
Part No.
t .
TEDS
TEKAS
TECAS
KI
TEKAS
DICK
MOT
TEXAS
DICK
lN914
lN914
1N914
lN914
lN914
lN914
lN914
lN914
-lN914
lNJ06
4006
lN914
lNJ18
RF-28
RF-28
RF-28
RF-28
RF-28
w-28
RF-28
RF-28
28227A
RF-28
DZ-1
RF-38
RF-28
DZ-18
10
..
..
..
..
..
..
..
1
..
1
1
..
1
Mfr.
Code
Mfr.
Desig.
Keithley
Part No.
t .
LITRb
LITRO
RL209
RL209
26746A*
26746A*
2
..
Mfr.
Code
Mfr.
DesiR.
Keithley
Part NO.
t .
CAN
BERG
BERG
BERG
BERG
BERG
BERG
&ii
DAM-15s
20052
20370
20052
20052
65039-035
65039-035
DAM-15P
cs-303
CS-237
CS-251
CS-237
CS-237
CS-266
CS-266
cs-304
1
3
1
..
..
2
..
1
Mfr.
Code
Mfr.
Desig.
Keithley
Part No.
t .
BAB
BAB
BAB
BAB
BAB
BAR
BAB
MB
K2T-6V-1
K2T-6V-1
KZT-6V-1
Km-6V-1
KZT-6V-1
KZT-6V-1
K2T-6V-1
K2T-24V-1
RL-42
RL-42
RL-42
RL-42
RL-42
RL-42
RL-42
RL-43
7
..
..
..
..
..
..
1
TEXAS
TBXAS
TELL3
TEXAS
TEXAS
CONNECTORS
Description
15-pin, Remote Program (Female) ...........
lo-pin ........................
5-pin .. ,* ......................
lO-pin ........................
lo-pi" ........................
2-pin ........................
2-lli* ........................
15-pin, mate for Remote Program (Furnished)
part of circuit
Mfr.
Code
.....
board, pc-342 ............
RELAYS
circuit
DeSig.
K401
K402
K403
K404
K405
K406
K407
K408
50
Description
DPDT.6V .......................
DPDT.6V .......................
DPDT.6V .......................
DPDT.6V .......................
DPDT.6V .......................
DPDT,6V .......................
DPDT,6V. ......................
DPDT.24V ......................
0776
MODEL2271
REPLACEABLEPARTS
TRANSISTORS
Circuit
Desip.
0401
6402
q403
0404
6405
Q406
Q407
DescriDtion
NPN. Case TO-92 . , .
JFET.............
NPN, Case TO-92 .......
NPN. Case TO-92 .......
PNP; Power Type, Case
NPN, Case TO-106. . ,
NPN, Case TO-106. . .
. . . .
Mfr.
Code
Mfr.
Desig.
Keithley
Part No.
t .
MOT
MOT
283904
2N4391
2N3904
2N3904
TG-47
TG-80
TG-47
TG-47
3
1
..
..
RCA
FAIR
FAIR
2135416
2103565
2N3565
TG-105
TG-39
TG-39
:
..
Mfr.
Code
Mfr.
De&z.
Keithley
Part No.
t .
A-B
A-B
DALE
A-B
BECK
IRC
BECK
DALE
DALE
DALE
DALE
BECK
DALE
A-B
IRC
A-B
IRC
DALE
DALI?
A-B
A-B
A-B
A-B
A-B
A-B
DALE
IRC
A-B
A-B
IRC
IRC
DALE
DALE
A-B
A-B
DALE
DALE
IRC
CB-223-10%
CB-563-10%
MFF-l/2-T9
CB-182-10%
89P-50K
CEA-TO-l.lkn
89P-2K
MFF-l/8-T9-499K
MFF-l/8-T9-499K
MFF-l/8-T9-475K
MFF-l/8-T9-49.9K
89P-50K
MFF-l/8-T9CB-223-10%
CBA-TO-1Okn
CB-225-10%
CBA-TO-1OkR
MFF-l/8-6.04K
MFF-l/8-28K
CB-332-10%
CB-104-10%
CB-472-10%
CB-105-10%
CB-103-10%
CB-472-10%
mF-l/8-1OK
CEA-TO-II. J5K
CB-103-10%
CB-223-10%
CRA-TO-9.09K
CBA-TO-1K
MFF-l/8-1OK
MFF-l/8-T9-29.4K
GB-104-10%
CB-104-10%
MFF-l/8-T9-3.09K
MFP-l/8-T9-3.09K
89P-50K
Cm-TO-715
R76-22K
R76-56K
Rl71-499K
RJ6-1.8K
RP89-50K
R88-l.lK
RP89-2K
R177-499K
R177-499K
R177-475K
R177-49.9K
P.P89-50K
R177-1K
R76-22K
R88-10K
R76-2.X
R88-10K
R179-6.04K
R179-28K
R76-3.3K
R76-100K
R76-4.7K
R76-IN
R76-10K
RJ6-4.7K
Rl68-10K
R88-4.75K
R76-10K
R76-22K
R88-9.09K
R88-1K
Rl68-10K
R177-29.4K
R2-100K
R76-100K
R177-3.09K
Rl77-3.09K
RP89-50K
R88-715
3
1
1
1
2
1
1
2
*.
1
1
..
1
..
2
1
..
1
1
1
2
2
1
..
..
2
1
..
..
1
1
..
1
1
..
2
..
1
1
Mfr.
Code
Mfr.
Desig.
Keithley
Part No.
t .
NAT
NAT
FAIR
FAIR
FAIR
FAIR
LH308N*
W308H
Special
UGT7741393
FCD820
UGT7741393
MOT
MOT
TO-5. .
. . . .
. . . .
RESISTORS
Circuit
Desig.
R401
R402
R403
It404
R405
R406
R407
R408
R409
R410
R411
R412
R413
R414
R415
R416
R417
R418
R419
R420
R421
R422
R423
R424
R425
R426
R427
R428
R429
R430
R431
R432
R433
R434
R435
R436
R437
R438
R439
Description
22kO~,lo%, 0.25W, Camp. .
56k0, 10%. 0.25W, Camp. .
499kR. 0.5%, 0.5W, MtF. ,
1.8k0, lo%, 0.25W, Cmp .
50kn, Cermet. . . . . . .
l.lko,
l%, O.lZSW, MtF. .
2kc7, Cemet . . . . . . .
499kR, 0.12%. 1W. MtF . .
499k0, 0.12%, 1W; MfF . .
475kn. 0.12X, lw, MtF . .
49.9k51, O.lZ%, lw, MtF. .
SOkR, Cermet. . . . . . .
lkn, 0.12%, lW, MtF . . .
6.8kR. 10%. 0.25W. Cow .
lOkn, l%, O.l25W, MtF . .
Z.ZMn, 10%. 0.25W, Camp .
lOkR, l%, O.l25W, MtP . .
6.04kn, O.l%, O.l25W, MtF
28kR, O.l%, O.l25W, MtF .
3.3kn, lo%, 0.25W, Camp .
100kQ. 10%. 0.25W. Corm .
4.7kR; 10%; 0.25W; Cm; .
lMn, lo%, 0.25W, Camp . .
2.2k0, lo%, 0.25W, Cmp .
4.7kR, lo%, 0.25W, Camp .
lOkn, l%, O.l25W, MtF . .
4.75kn, lZ, O.lZSW, MfF .
lOkR, 10%. 0.25W, Camp. .
22kn, lo%, 0.25W, Camp. .
9.09kn. 1%. O.l25W, MtF .
lkn, l%, O.l25W, MtF. . .
lOk0, l%, O.l25W, MtF . .
29.4kn. 0.12%._, 1W. MtF. .
lOOkQ, lo%, l.OW, Cap. .
lOOkR, lo%, 0.25W, Camp .
3.09k*, 0.122, lW, MtF. .
3.09k0, 0.12%. lW, MtF. .
50k0, Cermet. . . . . . .
715fi, 1%. O.l25W, MtF . .
.
.
.
.
.
.
.
.
.
.
,
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
*
.
.
.
*
.
.
.
.
.
.
.
.
.
.
.
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.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
.........
INTRGRATEDCIRCUITS
Circuit
Desig.
u401
U402
"403
II404
II405
II406
0975
Description
Operational
Operational
Operational
Operational
Amplifier,
E-pin
Amplifier,
8-pin,
Amplifier,
8-pin
Amplifier,
8-pin
Isoiat~r,
6-pin DIP . . . .
Operariowl
Amplifier,
8-pin
DIP (*Selected).
Case TO-99. .
DIP. . . . . .
DIP. . . . . .
. . . . . . . .
DIP. . . , . .
.
.
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.
264268
K-67
IC-77
IC-42
IC-82
IC-42
1
1
1
2
1
..
51
COMPONENTS LOCATED
circuit
Desig.
Location
Code
Cl01
Cl02
Cl03
Cl08
Cl09
Cl10
Cl11
04
F-4
F-2
03
P-5
F-l
B-3
&3
A-3
A-2
F-3
CR104
ml05
CR106
CR107
CRlO8
CR109
ml10
F-4
F-3
F-4
C-3
B-3
C-3
E-2
B-2
D-2
A-l
DSlOl
us102
DS103
DS104
E-l
F-l
C-l
G-4
FlOl
E-l
Cl05
Cl06
Cl07
q101
circuit
Desig.
ON PC-330
Location
Code
circuit
Desig .
C-3
Rlo2
RI03
Rlo4
R105
RlO6
R107
R108
R109
RllO
RI11
R112
R113
R114
R115
R116
RI17
R118
R119
R120
R121
R122
R123
R125
R126
R127
R128
Rl29
R130
R131
H-4
F-4
G-4
F-4
F-4
G-3
G-3
63
C-3
F-2
F-4
F-4
B-2
c-2
c-2
D-3
c-4
C-2
B-3
B-3
c-3
c-3
D-2
D-2
D-2
A-2
A-4
D-2
A-3
RI32
R133
R134
R135
R136
RI37
R138
R139
Rl40
R141
Code
A-3
c-4
E-4
A-l
E-l
F-2
F-2
F-2
R143
R144
R145
Rl46
R147
R148
R149
c-3
D-3
D-3
D-3
D-3
D-3
D-4
D-4
A-2
D-3
SlOl
s102
5103
s104
s105
S106
5107
62
B-2
C-l
E-3
A-2
c-3
D-4
u102
u103
In04
c-3
B-3
E-2
R142
.
Location
A
I
B
I
C
I DI E I FlG
H
1
1
2
2
3
3
4
4
A
I 6
IClDlE
FIGURE 33.
component Layout,
FIG
PC-330.
REPLACEABLE
PARTS
MODEL227
COMPONENTS
LOCATEDON PC-331
circuir
Desip.
c201
c202
C203
C204
C205
C206
C207
C208
c210
c211
c212
c213
C214
C215
C216
C217
C218
c219
c220
c221
c222
A-2
A-2
A-2
A-3
A-4
B-4
A-4
B-2
c-2
B-2
c-4
c-5
C-6
C-6
A-6
A-5
B-5
B-7
B-5
A-6
D-7
c301
C302
c303
c304
c305
C306
c307
C308
c309
C3LO
c311
C312
K-2
L-2
K-4
L-6
K-6
H-7
H-7
.,-6
H-5
H-5
K-5
L-6
CR201
CR202
CR203
CR204
CR205
CR206
B-3
A-3
c-3
9302
D-6
C-6
9306
54
CR207
CR208
CR209
CR210
CR211
CR212
c-7
A-6
A-7
c-3
D-2
CR301
CR302
CR303
CR304
CR305
CR306
CR307
L-4
K-4
L-7
G-4
K-S
K-5
K-5
P201
P202
P203
P205
P206
A-4
A-4
B-l
C-l
B-2
Q201
q202
Q203
Q204
Q205
0206
Q207
Q208
Q209
Q210
9211
9212
D-4
G-5
D-3
D-3
D-3
c-3
07
c-4
C-6
D-7
D-7
R-5
Q301
K-5
J-5
L-5
K-6
K-6
H-5
9303
Q304
q305
C-6
Q307
H-5
R201
R202
R203
R204
R205
R206
R207
R208
R209
R210
R2.u
R212
R213
R214
a215
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
R231
R232
R233
R234
R235
R236
R237
R238
A-2
A-l
B-4
A-3
A-2
A-2
B-3
B-3
A-3
A-3
c-4
B-4
B-2
B-4
A-4
B-4
B-5
c-5
c-4
c-2
c-2
D-2
D-3
D-3
R-3
R-3
c-3
D-3
c-3
D-5
D-5
c-5
D-7
C-6
A-6
A-6
A-7
A-6
Location
Code
R239
R240
R241
R242
R243
R244
A-7
B-5
A-7
B-6
B-5
B-5
R301
R302
R303
R304
R305
R306
R307
R308
R309
RX10
R311
R312
R313
R314
R315
R316
R317
K-5
L-4
L-5
K-6
L-7
K-7
~-6
L-5
K-6
L-5
J-7
.F7
H-6
H-6
H-6
x-6
H-6
5302
S303
M-l
M-2
TK301
n-6
UZOI
u202
U203
U204
u205
U206
A-2
R-4
B-4
R-4
B-2
B-6
u301
U302
u303
II304
K-7
H-6
s-7
H-7
1174
I
L
:I’ ii’
;/ ..:;:’
h I
COMPONENTS
LOCATEDON PC-342
circuit
LWXti0lI
Code
circuit
Desig.
c401
C402
c403
c404
c405
C406
c407
c-3
G-3
G-3
E-2
E-2
G-3
F-2
5402
5403
5404
5405
5406
D-l
G-2
c-2
E-2
G-l
CR401
CR402
CR403
CR404
CR405
CR406
CR407
CR408
CR409
CR410
CR411
CR412
CR413
CR414
B-2
B-2
c-2
c-2
D-1
E-l
F-l
G-2
A-2
c-3
c-3
B-3
c-3
G-3
K401
K402
K403
K404
K405
K406
K407
K408
B-l
R-3
B-3
c-2
"-2
E-2
F-2
G-2
q401
Q402
F-3
D-2
D-3
F-l
B-3
G-3
c-3
DS401
US402
03
G-3
Desig.
q403
Q404
q405
Q406
a407
R401
R402
R403
R404
8405
R406
R407
R408
R409
R41.0
R411
R412
R413
R414
R415
R416
R417
R418
R419
R420
R421
R422
D-3
B-3
A-3
B-3
G-l
A-3
A-l
A-3
A-3
A-2
G-2
G-l
D-3
P-3
G-2
G-2
G-3
G-2
F-3
F-3
G-l
F-l
1
FIGURE 35.
Component Layout,
PC-342.
circuit
Desig.
Locatfo,
Code
8423
R424
R425
R426
R427
R428
R429
R430
R431
R432
R433
R434
R435
R436
R437
R438
R439
F-l
F-l
F-l
E-3
E-3
D-3
D-3
D-3
D-3
F-3
Ii-3
G-3
F-3
A-2
A-2
A-2
G-2
II401
U402
u403
u404
u405
U406
F-3
B-3
R-3
G-3
G-l
D-3
MODEL 227
REPLACEABLEPARTS
COMPONENTS
LOCATED ON PC-396
Location
Circuit
c501
C502
c503
B-3
B-2
A-2
CR501
CR502
CR503
CR504
CR505
B-2
B-l
B-2
A-3
A-3
P501
P502
c-2
A-2
c-3
Q501
I
A
I
I
Circuit
Location
Q502
4503
4504
C-l
B-3
B-l
R501
R502
R503
R504
R505
R506
R507
R508
R509
B-3
B-2
B-l
B-2
A-l
A-2
A-l
A-2
A-2
B
c
I
1
1
2
2
3
3
FIGURE 36.
0178
I
component Layout,
PC-396.
57
REPLACEABLE
PARTS
MODEL227
KEITHLEY PART NO. IC-2,24
KEITHLEY PART NO. IC-42
TO-99
0tw1
+
%I
0
04v-
2
3
4
-INWT +,NP”I v-
KEITHLEY PART NO. IC - 53
KEITHLEY PART NO. IC -60
LEAD DESIG. CO-l
FIGURE 37.
58
Case Outlines,
Integrated
Circuits.
0178
MODEL227
KEITHLEY PART NO. IC-61
IC 76
KEITHLEY PART NO. IC-77
KEITHLEY PART NO. IC-67
KEITHLEY PART NO. IC- 82
P1lxJP.E38.
0178
Case Outlines,
Integrated
Circuits.
59
MODEL227
REPLACEABLE
PARTS
KEITHLEY PART NO. IC -91
KEITHLEY
PART NO. DN-2
JEDEC
TO-116
TO-99
LEAD
DESIG.
TO- 3
GE’
LEAD
+iQJ
DESIG.
f?J
TO-5
qJ$
TO-5
TO-3
LEAD
-e)
DESIG.
z2
E
+ii)
LEAD DESIG.
B+$
g6
E
BomoM
YIEW
60
TO-92
Bc.2T.m
Ylrn
TO-106
B%)
C
0178
--T-l+
L
I
+”
z
:
,o
z
---
-----:
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AAd.A.4
-j-j=+
r
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-
%
B
:
B
-
x
-
7
-
h
-
I
u
-
*
-
w
-
c
-
L
-
m
-
,e
-
I
I
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-----__
--A____
KEITHLEY INSTRUMENTS, INC.
28775 AURORA ROAD
CLEVELAND, OHIO 44139
SERVICE
MODEL NO.
SERIAL NO.
FORM
P.O. NO;
DATE
NAME
CITY
ADDRESS
Describe
readings,
problem and symptoms using
chart recordings,
etc.)
quantitative
cl3.
cl4.
List the positions
the instrument.
Describe
6. i--:t,;:i
El
.
El
-
additional
Show a block diagram of your measurement system including
(whether
power is turned on or not).
Also describe
signal
5. List
Cl
.
7
Ll
STATE -ZIP
data whenever
(Attach
El
I
PHONE
COMPANY
cl1.
R-
input
of fi
controls
and switches
on both
signal
source
levels,
frequencies.
and describe
all
cables
used in
the experiment
describe
all
other
equipment
used in the
possible
sheets
(enclose
as necessary).
all instruments
source.
front
and rear
connected
panels
of
etc.
(length,
experiment.
shielding,
Give
etc.).
control
settings
Environment:
(Factory,
controlled
laboratory,
Where is the measurement being performed?
out-of-doors,
etc.)
Variation?
Frequency?
What power line voltage
is used?
"F. Rel. Humidity?
Variation?
Ambient temperature?
"F.
Other
Additional
Information.
please describe
below.)
(If
special
modifications
have been made by the user,
Source Exif Data:
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