34970 90012 Keysight Service Guide 2

User Manual: Keysight-34970-service-guide-2

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Keysight 34970A
Data Acquisition/Switch Unit

Service
Guide

warranty.fm Page 0 Tuesday, May 9, 2006 4:55 PM

© Copyright Keysight Technologies,

1997- 2015

No part of this manual may be
reproduced in any form or by any
means (including electronic storage
and retrieval or translation into a
foreign language) without prior
agreement and written consent from
Keysight Technologies as governed by
the United States and international
copyright laws.

Manual Part Number
34970-90012, (order as
34970-90101 manual set)

Edition
Edition 7, February 2015

Printed in Malaysia
Keysight Technologies,
815 14th Street S.W.
Loveland, Colorado 80537 U.S.A.

Assistance
Product maintenance agreements and
other customer assistance agreements are
available for Keysight Technologies
products. For assistance, contact your
nearest Keysight Technologies Sales and
Service Office.Further information is
availableon the Keysight website at
www.keysight.com/find/assist.

Warranty

Safety Notices

The material contained in this
document is provided “as is,” and is
subject to being changed, without
notice, in future editions. Further,
to the maximum extent permitted
by applicable law, Keysight
disclaims all warranties, either
express or implied with regard to
this manual and any information
contained herein, including but
not limited to the implied
warranties of mer-chantability and
fitness for a particular purpose.
Keysight shall not be liable for
errors or for incidental or
consequential damages in
connection with the furnishing,
use, or performance of this
document or any information
contained herein. Should Keysight
and the user have a separate
written agreement with warranty
terms covering the material in this
document that conflict with these
terms, the warranty terms in the
separate agreement will control.

Do not defeat power cord safety ground
feature. Plug in to a grounded outlet.
Do not use product in any manner not
specified by the manufacturer.
Do not install substitute parts or perform
any unauthorized modification to the
product. Return the product to a Keysight
Technologies Sales and Service Office for
service and repair to ensure that safety
features are maintained.

WARNING
A WARNING notice denotes a hazard.
It calls attention to an operating procedure, practice, or the like that, if not
correctly performed or adhered to,
could result in personal injury or death.
Do not proceed beyond a WARNING
notice until the indicated conditions are
fully understood and met.

Technologies Licenses

CAUTION

The hardware and/or software described
in this document are furnished under
a license and may be used or copied
only in accordance with the terms of
such license.

A CAUTION notice denotes a hazard.
It calls attention to an operating procedure, practice, or the like that, if not
correctly performed or adhered to,
could result in damage to the product or
loss of important data. Do not proceed
beyond a CAUTION notice until the
indicated conditions are fully understood
and met.

Restricted Rights Legend

If software is for use in the performance of
a U.S. Government prime contract or
subcontract, Software is delivered and
Trademark Information
licensed as “Commercial computer software” as defined in DFAR 252.227-7014
Microsoft® and Windows® are U.S.
(June 1995), or as a “commercial item” as
registered trademarks of Microsoft
defined in FAR 2.101(a) or as
Corporation. All other brand and
“Restricted computer software” as defined
product names are trademarks or
in FAR 52.227-19 (June 1987) or any
registered trademarks of their
equivalent agency regulation or contract
respective companies.
clause. Use, duplication or disclosure of
Software is subject to Keysight
Certification
Technologies’ standard commercial
Keysight Technologies certifies that this license terms, and non-DOD Departments
product met its published specifications at and Agencies of the U.S. Government will
receive no greater than Restricted Rights
the time of shipment from the factory.
as defined in FAR 52.227-19(c)(1-2) (June
Keysight Technologies further certifies
1987).
that its calibration measurements are
U.S. Government users will receive no
traceable to the United States National
greater than Limited Rights as defined in
Institute of Standards and Technology, to
FAR 52.227-14 (June 1987) or DFAR
the extent allowed by that organization's
calibration facility, and to the calibration 252.227-7015 (b)(2) (November 1995), as
facilities of other International Standards applicable in any technical data.
Organization members.

Symbols
Earth ground

Chassis ground

Risk of electric shock

W ARN IN G
Main power disconnect: Unplug
product from wall outlet and remove
power cord before servicing. Only qualified, service-trained personnel should
remove the cover from the instrument
or connect external wiring to a module.
For continued protection against fire,
replace the line fuse only with a fuse
of the specified type and rating.

Note: Unless otherwise indicated, this manual applies to all serial numbers.

The Keysight Technologies 34970A combines precision measurement
capability with flexible signal connections for your production and
development test systems. Three module slots are built into the rear of
the instrument to accept any combination of data acquisition or
switching modules. The combination of data logging and data
acquisition features makes this instrument a versatile solution for your
testing requirements now and in the future.
Convenient Data Logging Features
• Direct measurement of thermocouples, RTDs, thermistors, dc voltage,
ac voltage, resistance, dc current, ac current, frequency, and period
• Interval scanning with storage of up to 50,000 time-stamped readings
• Independent channel configuration with function, Mx+B scaling,
and alarm limits available on a per-channel basis
• Intuitive user interface with knob for quick channel selection,
menu navigation, and data entry from the front panel
• Portable, ruggedized case with non-skid feet
• BenchLink Data Logger 3 Software for Microsoft ® Windows ® included
Flexible Data Acquisition / Switching Features
• 61⁄2-digit multimeter accuracy, stability, and noise rejection
• Up to 60 channels per instrument (120 single-ended channels)
• Reading rates up to 600 readings per second on a single channel and
scan rates up to 250 channels per second
• Choice of multiplexing, matrix, general-purpose Form C switching,
RF switching, digital I/O, totalize, and 16-bit analog output functions
• GPIB (IEEE-488) interface and RS-232 interface are standard
• SCPI (Standard Commands for Programmable Instruments) compatibility
Warning

The procedures in this manual are intended for use by qualified,
service-trained personnel only.

Keysight 34970A
Data Acquisition/Switch Unit

Page 1 (Service Guide)

The Front Panel at a Glance

Denotes a menu key. See the next page for details on menu operation.

1 State Storage / Remote Interface Menus
2
3
4
5
6
7

2

Scan Start / Stop Key
Measurement Configuration Menu
Scaling Configuration Menu
Alarm / Alarm Output Configuration Menu
Scan-to-Scan Interval Menu
Scan List Single Step/Read Key

8
9
10
11
12
13
14

Advanced Measurement / Utility Menus
Low-Level Module Control Keys
Single-Channel Monitor On/Off Key
View Scanned Data, Alarms, Errors Menu
Shift / Local Key
Knob
Navigation Arrow Keys

The Front-Panel Menus at a Glance
Several of the front-panel keys guide you through menus to configure
various parameters of the instrument (see previous page). The following
steps demonstrate the menu structure using the
key.
1 Press the menu key. You are automatically
guided to the first level of the menu.
Rotate the knob to view the other choices
on the first level of the menu.

G

The menu will automatically timeout after
about 20 seconds of inactivity. You will be
returned to the operation in progress prior
to entering the menu.
2 Press the same menu key again to move
to the next item of the menu. Typically,
this is where you choose parameter values
for the selected operation.

3 Rotate the knob to view the choices on this
level of the menu. When you reach the end
of the list, rotate the knob in the opposite
direction to view all of the other choices.
The current selection is highlighted for emphasis.
All other choices are dimmed.

4 Press the same menu key again to accept the
change and exit the menu. A brief confirmation
message is displayed.

Tip: To review the current configuration of a specific menu, press the menu key several times.
A message NO CHANGES is displayed when you exit the menu.
3

Display Annunciators

SCAN
MON
VIEW
CONFIG
ADRS
RMT
ERROR
EXT
ONCE
MEM
LAST
MIN
MAX
SHIFT
4W
OC

Scan is in progress or enabled. Press and hold
again to turn off.
Monitor mode is enabled. Press
again to turn off.
Scanned readings, alarms, errors, or relay cycles are being viewed.
Channel configuration is in progress on displayed channel.
Measurement is in progress.
Instrument is addressed to listen or talk over the remote interface.
Instrument is in remote mode (remote interface).
Hardware or remote interface errors are detected. Press
to read errors.
Instrument is configured for an external scan interval.
Scan Once mode is enabled. Press
to initiate and hold key to disable.
Reading memory overflow; new readings will overwrite the oldest readings.
Viewed data is the last reading stored during most recent scan.
Viewed data is the minimum reading stored during most recent scan.
Viewed data is the maximum reading stored during most recent scan.
has been pressed. Press
again to turn off.
4-wire function is in use on displayed channel.
Offset compensation is enabled on displayed channel.
Alarms are enabled on displayed channel.
Mx+B scaling is enabled on displayed channel.
HI or LO alarm condition has occurred on indicated alarms.

To review the display annunciators, hold down the
turn on the instrument.

4

key as you

The Rear Panel at a Glance

1 Slot Identifier (100, 200, 300)
2 Ext Trig Input / Alarm Outputs / Channel
Advance Input / Channel Closed Output
(for pinouts, see chapter 4 in User’s Guide)
3 RS-232 Interface Connector

4
5
6
7

Power-Line Fuse-Holder Assembly
Power-Line Voltage Setting
Chassis Ground
GPIB (IEEE-488) Interface Connector

Use the
Menu to:
• Select the GPIB or RS-232 interface (see chapter 2 in User’s Guide).
• Set the GPIB address (see chapter 2 in User’s Guide).
• Set the RS-232 baud rate, parity, and flow control mode (see chapter 2 in User’s Guide).

WARNING

For protection from electrical shock, the power cord ground must not be
defeated. If only a two-contact electrical outlet is available, connect the
instrument’s chassis ground screw (see above) to a good earth ground.

5

The Plug-In Modules at a Glance
For complete specifications on each plug-in module, refer to the module
sections in chapter 1.

34901A 20-Channel Armature Multiplexer
• 20 channels of 300 V switching
• Two channels for DC or AC current measurements (100 nA to 1 A)
• Built-in thermocouple reference junction
• Switching speed of up to 60 channels per second
• Connects to the internal multimeter
Each of the 20 channels switches both HI and LO inputs, thus providing
fully isolated inputs to the internal multimeter. The module is divided
into two banks of 10 two-wire channels each. When making four-wire
resistance measurements, channels from Bank A are automatically
paired with channels from Bank B. Two additional fused channels are
included on the module (22 channels total) for making calibrated DC or
AC current measurements with the internal multimeter (external shunt
resistors are not required). You can close multiple channels on this
module only if you have not configured any channels to be part of the scan
list. Otherwise, all channels on the module are break-before-make.

34902A 16-Channel Reed Multiplexer
• 16 channels of 300 V switching
• Built-in thermocouple reference junction
• Switching speed of up to 250 channels per second
• Connects to the internal multimeter
Use this module for high-speed scanning and high-throughput
automated test applications. Each of the 16 channels switches both
HI and LO inputs, thus providing fully isolated inputs to the internal
multimeter. The module is divided into two banks of eight two-wire
channels each. When making four-wire resistance measurements,
channels from Bank A are automatically paired with channels from
Bank B. You can close multiple channels on this module only if you have
not configured any channels to be part of the scan list. Otherwise, all
channels on the module are break-before-make.

6

34903A 20-Channel Actuator / General-Purpose Switch
• 300 V, 2 A actuation and switching
• SPDT (Form C) latching relays
• Breadboard area for custom circuits
Use this module for those applications that require high-integrity
contacts or quality connections of non-multiplexed signals. This module
can switch 300 V, 1 A (50 W maximum switch power) to your device
under test or to actuate external devices. Screw terminals on the module
provide access to the Normally-Open, Normally-Closed, and Common
contacts for each of the 20 switches. A breadboard area is provided near
the screw terminals to implement custom circuitry, such as simple
filters, snubbers, or voltage dividers.

34904A 4x8 Two-Wire Matrix Switch
• 32 two-wire crosspoints
• Any combination of inputs and outputs can be connected at a time
• 300 V, 1 A switching
Use this module to connect multiple instruments to multiple points on
your device under test at the same time. You can connect rows and
columns between multiple modules to build larger matrices such as
8x8 and 4x16, with up to 96 crosspoints in a single mainframe.

34905/6A Dual 4-Channel RF Multiplexers
• 34905A (50Ω ) / 34906A (75Ω )
• 2 GHz bandwidth with on-board SMB connections
• 1 GHz bandwidth with SMB-to-BNC adapter cables provided
These modules offer wideband switching capabilities for high frequency
and pulsed signals. Each module is organized in two independent banks
of 4-to-1 multiplexers. Both modules offer low crosstalk and excellent
insertion loss performance. To create larger RF multiplexers, you can
cascade multiple banks together. Only one channel in each bank may be
closed at a time.

7

34907A Multifunction Module
• Two 8-bit Digital Input/Output ports, 400 mA sink, 42 V open collector
• 100 kHz Totalize input with 28 bits of resolution
• Two 16-bit, ± 12 V Calibrated Analog Outputs
Use this module to sense status and control external devices such as
solenoids, power relays, and microwave switches. For greater flexibility,
you can read digital inputs and the count on the totalizer during a scan.

34908A 40-Channel Single-Ended Multiplexer
• 40 channels of 300 V single-ended (common LO) switching
• Built-in thermocouple isothermal reference junction
• Switching speed of up to 60 channels per second
• Connects to the internal multimeter
Use this module for high-density switching applications which require
single-wire inputs with a common LO. All relays are break-before-make
to ensure that only one relay is connected at any time.

8

In This Book
Specifications Chapter 1 lists the technical specifications for the
mainframe and plug-in modules.
Quick Start Chapter 2 helps you get familiar with a few of the
instrument’s front-panel features.
Front-Panel Overview Chapter 3 introduces you to the front-panel
menus and describes some of the instrument’s menu features.
Calibration Procedures Chapter 4 provides calibration, verification,
and adjustment procedures for the instrument.
Theory of Operation Chapter 5 describes block and circuit level
theory related to the operation the instrument.
Service Chapter 6 provides guidelines for returning your instrument
to KeysightTechnologies for servicing, or for servicing it yourself.
Replaceable Parts Chapter 7 contains detailed parts lists for the
mainframe and plug-in modules.
Schematics Chapter 8 contains the instrument’s block diagram,
schematics, disassembly drawings, and component locator drawings.

If you have questions relating to the operation of the 34970A,
call 1-800-452-4844 in the United States, or contact your nearest
Keysight Technologies Sales Office.
If your 34970A fails within one year of original purchase, Keysight will
replace it free of charge. Call 1-800-829-4444 and select "Option 3"
followed by "Option 1".

9

Contents
Chapter 1 Specifications
DC, Resistance, and Temperature Accuracy Specifications 16
DC Measurement and Operating Characteristics 17
AC Accuracy Specifications 18
AC Measurement and Operating Characteristics 19
Measurement Rates and System Characteristics 20
Module Specifications 21
BenchLink Data Logger Software Specifications 24
Product and Module Dimensions 25
To Calculate Total Measurement Error 26
Interpreting Internal DMM Specifications 28
Configuring for Highest Accuracy Measurements 31

Contents

Chapter 2 Quick Start
To Prepare the Instrument for Use 35
To Connect Wiring to a Module 36
To Set the Time and Date 38
To Configure a Measurement Channel 39
To Monitor a Single Channel 40
To Close a Channel 41
If the Instrument Does Not Turn On 42
To Adjust the Carrying Handle 44
To Rack Mount the Instrument 45
Chapter 3 Front-Panel Overview
Front-Panel Menu Reference 49
To Unsecure for Calibration 51
To Secure Against Calibration 51
To Change the Security Code 52
Error Messages 52
To Perform a Zero Adjustment 53
To Apply Mx+B Scaling to Measurements 54
To Read the Relay Cycle Count 55
To Read a Digital Input Port 56
To Write to a Digital Output Port 57
To Read the Totalizer Count 58
To Output a DC Voltage 59

10

Contents

Chapter 4 Calibration Procedures

Contents

KeysightTechnologies Calibration Services 63
Calibration Interval 63
Adjustment is Recommended 63
Time Required for Calibration 64
Automating Calibration Procedures 64
Recommended Test Equipment 65
Input Connections 66
Calibration Security 67
To Unsecure the Instrument Without the Security Code 68
Calibration Message 69
Calibration Count 69
Calibration Procedure 70
Aborting a Calibration in Progress 70
Test Considerations 71
Performance Verification Tests 72
Self-Test 73
Quick Performance Check 74
Performance Verification Tests 74
Internal DMM Verification Tests 75
Zero Offset Verification 75
Gain Verification 77
Optional AC Performance Verification Tests 80
Internal DMM Adjustments 81
Zero Adjustment 81
Gain Adjustment 82
–10 Vdc Adjustment Procedure (Optional) 85
Plug-in Module Test Considerations 87
Relay Verification 88
Relay Cycle Count 88
34901A Relay Contact Resistance Verification (Optional) 89
34902A Relay Contact Resistance Verification (Optional) 96
34903A Relay Contact Resistance Verification (Optional) 101
34904A Relay Contact Resistance Verification (Optional) 102
34905A/06A Relay Contact Resistance Verification (Optional) 105
34908A Relay Contact Resistance Verification (Optional) 106
Thermocouple Reference Junction (Optional) 112
Thermocouple Reference Junction Verification 112
Thermocouple Reference Junction Adjustments 113
34907A Analog Output 114
Analog Output Verification Test 114
Analog Output Adjustment 115

11

Contents

Contents

Chapter 5 Theory of Operation
System Block Diagram 119
Floating Logic 120
Memory 123
Earth-Referenced Logic 124
Power Supplies 125
Front Panel 127
Backplane 128
Analog Bus 128
Digital Bus 128
Internal DMM 129
DMM Block Diagram 129
Input 130
Input Amplifier 131
Ohms Current Source 133
AC Circuit 134
A-to-D Converter 136
Switch Modules 138
Switch Module Control 138
Relay Drivers 140
34901A 142
34902A 144
34903A 146
34904A 147
34905A/34906A 148
34908A 149
Multifunction Module 151
Multifunction Control 151
Totalizer 153
Analog Output 154
Digital I/O 155
Chapter 6 Service
Operating Checklist 159
Is the instrument inoperative? 159
Does the instrument fail self-test? 159
Is the Current measurement function inoperative? 159
Types of Service Available 160
Standard Repair Service (worldwide) 160
Express Exchange (U.S.A. only) 160
Repackaging for Shipment 161
Cleaning 161
Electrostatic Discharge (ESD) Precautions 162
Surface Mount Repair 162
To Replace the Power-Line Fuse 163

12

Contents

Chapter 6 Service (continued)

Contents

Troubleshooting Hints 163
Unit is Inoperative 163
Unit Reports Error 705 164
Isolating to an Assembly 164
Unit Fails Self-Test 164
Power Supplies 165
Self-Test Procedures 167
Power-On Self-Test 167
Complete Self-Test 167
Plug-in Module Self-Test 167
Self-Tests 168
Battery Check and Replacement 172
To Verify the Battery 173
To Replace the Battery 173
Disassembly 174
General Disassembly 175
Internal DMM Disassembly 176
Front-Panel Chassis Disassembly 177
Additional Disassembly 178
Plug-in Module Disassembly 179
Chapter 7 Replaceable Parts
Replaceable Parts 182
To Order Replaceable Parts 182
34970A Mainframe 183
34970-66501 Main PC Assembly (A1) 184
34970-66502 Front-Panel and Keyboard PC Assembly (A2) 189
34970-66503 Backplane PC Assembly (A3) 190
34970-66504 Internal DMM PC Assembly (A4) 191
34901A 20-Channel Multiplexer 196
34902A 16-Channel Multiplexer 200
34903A 20-Channel Actuator 202
34904A 4x8 Matrix 204
34905A/34906A RF Multiplexer 207
34907A Multifunction Module 209
34908A 40-Channel Multiplexer 213
Manufacturer’s List 216

13

Contents

Contents

Chapter 8 Schematics
Keysight34970A System Block Diagram 221
A1 Component Locator (top) 222
A1 Component Locator (bottom) 223
A1 Power Supply Schematic (Sheet 1 of 4) 224
A1 Floating Logic Schematic (Sheet 2 of 4) 225
A1 Earth Referenced Logic Schematic (Sheet 3 of 4) 226
A1 Memory Schematic (Sheet 4 of 4) 227
A2 Component Locator 228
A2 Display and Keyboard Schematic 229
A3 Component Locator 230
A3 Backplane Schematic 231
A4 Component Locator (top) 232
A4 Component Locator (bottom) 233
A4 Input and Protection Schematic (Sheet 1 of 4) 234
A4 Input Amplifier and Ohms Current Schematic (Sheet 2 of 4) 235 A4
AC Schematic (Sheet 3 of 4) 236
A4 A/D Converter Schematic (Sheet 4 of 4) 237
34901A 20-Channel Multiplexer Component Locator 238
34901A 20-Channel Multiplexer Schematic (Sheet 1 of 5) 239
34901A 20-Channel Multiplexer Schematic (Sheet 2 of 5) 240
34901A 20-Channel Multiplexer Schematic (Sheet 3 of 5) 241
34901A 20-Channel Multiplexer Schematic (Sheet 4 of 5) 242
34901A 20-Channel Multiplexer Schematic (Sheet 5 of 5) 243
34902A 16-Channel Multiplexer Component Locator 244
34902A 16-Channel Multiplexer Schematic (Sheet 1 of 4) 245
34902A 16-Channel Multiplexer Schematic (Sheet 2 of 4) 246
34902A 16-Channel Multiplexer Schematic (Sheet 3 of 4) 247
34902A 16-Channel Multiplexer Schematic (Sheet 4 of 4) 248
34903A 20-Channel Actuator Component Locator 249
34903A 20-Channel Actuator Schematic (Sheet 1 of 3) 250
34903A 20-Channel Actuator Schematic (Sheet 2 of 3) 251
34903A 20-Channel Actuator Schematic (Sheet 3 of 3) 252
34904A 4x8 Matrix Component Locator 253
34904A 4x8 Matrix Schematic (Sheet 1 of 3) 254
34904A 4x8 Matrix Schematic (Sheet 2 of 3) 255
34904A 4x8 Matrix Schematic (Sheet 3 of 3) 256
34905A/34906A RF Multiplexer Component Locator 257
34905A/34906A RF Multiplexer Schematic (Sheet 1 of 2) 258
34905A/34906A RF Multiplexer Schematic (Sheet 2 of 2) 259
34907A Multifunction Module Component Locator 260
34907A Multifunction Module Schematic (Sheet 1 of 5) 261
34907A Multifunction Module Schematic (Sheet 2 of 5) 262
34907A Multifunction Module Schematic (Sheet 3 of 5) 263
34907A Multifunction Module Schematic (Sheet 4 of 5) 264
34907A Multifunction Module Schematic (Sheet 5 of 5) 265
34908A 40-Channel Multiplexer Component Locator 266
34908A 40-Channel Multiplexer Schematic (Sheet 1 of 3) 267
34908A 40-Channel Multiplexer Schematic (Sheet 2 of 3) 268
34908A 40-Channel Multiplexer Schematic (Sheet 3 of 3) 269

14

1
1

• DC, Resistance, and Temperature Accuracy Specifications, on page 16
• DC Measurement and Operating Characteristics, on page 17
• AC Accuracy Specifications, on page 18
• AC Measurement and Operating Characteristics, on page 19
• Measurement Rates and System Characteristics, on page 20
• Module Specifications:
34901A, 34902A, 34908A, 34903A, 34904A, on page 21
34905A, 34906A, on page 22
Typical AC Performance Graphs, on page 23
34907A, on page 24
• BenchLink Data Logger Software Specifications, on page 24
• Product and Module Dimensions, on page 25
• To Calculate Total Measurement Error, on page 26
• Interpreting Multimeter Specifications, on page 28
• Configuring for Highest Accuracy Measurements, on page 31

Specifications

Chapter 1 Specifications
DC, Resistance, and Temperature Accuracy Specifications

DC, Resistance, and Temperature Accuracy Specifications
± ( % of reading + % of range ) [1]

Includes measurement error, switching error, and transducer conversion error
Range [3]

Function

Test Current or
Burden Voltage

DC Voltage

100.0000 mV
1.000000 V
10.00000 V
100.0000 V
300.000 V

Resistance [4]

100.0000 Ω
1.000000 kΩ
10.00000 kΩ
100.0000 kΩ
1.000000 MΩ
10.00000 MΩ
100.0000 MΩ

1 mA current source
1 mA
100 µA
10 µA
5 µA
500 nA
500 nA || 10 MΩ

DC Current

10.00000 mA
100.0000 mA
1.000000 A

< 0.1 V burden
< 0.6 V
<2V

34901A Only

Temperature
Thermocouple

RTD
Thermistor

Type
[6]

24 Hour [2]
23 °C ± 1 °C

90 Day
23 °C ± 5 °C

1 Year
23 °C ± 5 °C

Temperature
Coefficient /°C
0 °C – 18 °C
28 °C – 55 °C

0.0030 + 0.0035
0.0020 + 0.0006
0.0015 + 0.0004
0.0020 + 0.0006
0.0020 + 0.0020

0.0040 + 0.0040
0.0030 + 0.0007
0.0020 + 0.0005
0.0035 + 0.0006
0.0035 + 0.0030

0.0050 + 0.0040
0.0040 + 0.0007
0.0035 + 0.0005
0.0045 + 0.0006
0.0045 + 0.0030

0.0005 + 0.0005
0.0005 + 0.0001
0.0005 + 0.0001
0.0005 + 0.0001
0.0005 + 0.0003

0.0030 + 0.0035
0.0020 + 0.0006
0.0020 + 0.0005
0.0020 + 0.0005
0.002 + 0.001
0.015 + 0.001
0.300 + 0.010

0.008 + 0.004
0.008 + 0.001
0.008 + 0.001
0.008 + 0.001
0.008 + 0.001
0.020 + 0.001
0.800 + 0.010

0.010 + 0.004
0.010 + 0.001
0.010 + 0.001
0.010 + 0.001
0.010 + 0.001
0.040 + 0.001
0.800 + 0.010

0.0006 + 0.0005
0.0006 + 0.0001
0.0006 + 0.0001
0.0006 + 0.0001
0.0010 + 0.0002
0.0030 + 0.0004
0.1500 + 0.0002

0.005 + 0.010
0.010 + 0.004
0.050 + 0.006

0.030 + 0.020
0.030 + 0.005
0.080 + 0.010

0.050 + 0.020
0.050 + 0.005
0.100 + 0.010

0.002 + 0.0020
0.002 + 0.0005
0.005 + 0.0010

Best Range Accuracy [5]

Extended Range Accuracy [5]

B
E
J
K
N
R
S
T

1100°C to 1820°C
-150°C to 1000°C
-150°C to 1200°C
-100°C to 1200°C
-100°C to 1300°C
300°C to 1760°C
400°C to 1760°C
-100°C to 400°C

1.2°C
1.0°C
1.0°C
1.0°C
1.0°C
1.2°C
1.2°C
1.0°C

R0 from 49Ω
to 2.1 kΩ

-200°C to 600°C

0.06°C

0.003°C

2.2 k, 5 k, 10 k

-80°C to 150°C

0.08°C

0.002°C

400°C to 1100°C
-200°C to -150°C
-210°C to -150°C
-200°C to -100°C
-200°C to -100°C
-50°C to 300°C
-50°C to 400°C
-200°C to -100°C

[1] Specifications are for 1 hour warm up and 61 ⁄2 digits
[2] Relative to calibration standards
[3] 20% over range on all ranges except 300 Vdc and 1 Adc ranges
[4] Specifications are for 4-wire ohms function or 2-wire ohms using Scaling to remove the offset.
Without Scaling, add 1 Ω additional error in 2-wire ohms function.
[5] 1 year accuracy. For total measurement accuracy, add temperature probe error.
[6] Thermocouple specifications not guaranteed when 34907A module is present

16

1.8°C
1.5°C
1.2°C
1.5°C
1.5°C
1.8°C
1.8°C
1.5°C

0.03°C
0.03°C
0.03°C
0.03°C
0.03°C
0.03°C
0.03°C
0.03°C

Chapter 1 Specifications
DC Measurement and Operating Characteristics

1
DC Measurement and Operating Characteristics
DC Measurement Characteristics [1]
DC Voltage
Measurement Method:
A/D Linearity:
Input Resistance:
100 mV, 1 V, 10 V ranges
100 V, 300 V ranges
Input Bias Current:
Input Protection:
Resistance
Measurement Method:

Continuously Integrating,
Multi-slope III A/D Converter
0.0002% of reading + 0.0001% of range
Selectable 10 MΩ or >10 GΩ
10 MΩ ±1%
< 30 pA at 25 °C
300 V on all ranges

Input Protection:

Selectable 4-wire or 2-wire Ohms,
Current source reference to LO input
Selectable on 100Ω, 1 kΩ, 10 kΩ ranges
10% of range per lead for 100Ω and
1 kΩ ranges. 1 kΩ on all other ranges
300 V on all ranges

DC Current
Shunt Resistance:
Input Protection:

5Ω for 10 mA, 100 mA; 0.1Ω for 1A.
1.5A 250 V fuse on 34901A module

Thermocouple
Conversion:
Reference Junction Type:
Open T/C Check:

ITS-90 software compensation
Internal, Fixed, or External
Selectable per channel. Open > 5 kΩ

RTD

α = 0.00385 (DIN) and 0.00391

Thermistor

44004, 44007, 44006 series

Offset Compensation:
Max. Lead Resistance:

DC Operating Characteristics [5]
Function
DCV, DCI, and
Resistance:

Digits [6]
61 ⁄2
61 ⁄2
51 ⁄2
51 ⁄2
41 ⁄2

Readings/s
0.6 (0.5)
6 (5)
60 (50)
300
600

Additional
Noise Error
0% of range
0% of range
0.001% of range
0.001% of range [7]
0.01% of range [7]

Single Channel Measurement Rates [8]
Readings/s
6 (5)
53 (47)
490

Function
DCV, 2-Wire Ohms:

Resolution
61 ⁄2 (10 PLC)
51 ⁄2 (1 PLC)
41 ⁄2 (0.02 PLC)

Thermocouple:

0.1 °C (1 PLC)
0.1 °C (0.02 PLC)

49 (47)
280

RTD, Thermistor:

0.01 °C (10 PLC)
0.1 °C (1 PLC)
1 °C (0.02 PLC)

6 (5)
47 (47)
280

Autozero OFF Operation
Following instrument warm-up at calibration temperature ±1 °C
and < 10 minutes, add 0.0002% range additional error + 5 µV.
Settling Considerations
Reading settling times are affected by source impedance,
low dielectric absorption characteristics, and input signal changes.

Measurement Noise Rejection 60 Hz (50 Hz) [2]
DC CMRR:

140 dB

Integration Time
200 PLC / 3.33s (4s)
100 PLC / 1.67s (2s)
20 PLC / 333 ms (400 ms)
10 PLC / 167 ms (200 ms)
2 PLC / 33.3 ms (40 ms)
1 PLC / 16.7 ms (20 ms)
< 1 PLC

Normal Mode Rejection [3]
110 dB [4]
105 dB [4]
100 dB [4]
95 dB [4]
90 dB
60 dB
0 dB

[1] 300 Vdc isolation voltage (ch-ch, ch-earth)
[2] For 1 kΩ unbalance in LO lead
[3] For power line frequency ±0.1%
[4] For power line frequency ±1%, use 80 dB.
For power line frequency ±3%, use 60 dB.
[5] Reading speeds for 60 Hz and (50 Hz) operation; autozero OFF
[6] 61 ⁄2 digits=22 bits, 51 ⁄2 digits=18 bits, 41 ⁄2 digits=15 bits
[7] Add 20 µV for DCV, 4 µA for DCI, or 20 mΩ for resistance
[8] For fixed function and range, readings to memory,
scaling and alarms off, autozero OFF

17

Chapter 1 Specifications
AC Accuracy Specifications

AC Accuracy Specifications
± ( % of reading + % of range ) [1]

Includes measurement error, switching error, and transducer conversion error
Function

True RMS
AC Voltage [4]

Frequency
and Period [6]

True RMS
AC Current
34901A Only

Range [3]

Frequency

24 Hour [2]
23 °C ± 1 °C

90 Day
23 °C ± 5 °C

1 Year
23 °C ± 5 °C

Temperature
Coefficient /°C
0 °C – 18 °C
28 °C – 55 °C

100.0000 mV
to 100 V

3 Hz – 5 Hz
5 Hz – 10 Hz
10 Hz – 20 kHz
20 kHz – 50 kHz
50 kHz – 100 kHz
100 kHz – 300 kHz [5]

1.00 + 0.03
0.35 + 0.03
0.04 + 0.03
0.10 + 0.05
0.55 + 0.08
4.00 + 0.50

1.00 + 0.04
0.35 + 0.04
0.05 + 0.04
0.11 + 0.05
0.60 + 0.08
4.00 + 0.50

1.00 + 0.04
0.35 + 0.04
0.06 + 0.04
0.12 + 0.05
0.60 + 0.08
4.00 + 0.50

0.100 + 0.004
0.035 + 0.004
0.005 + 0.004
0.011 + 0.005
0.060 + 0.008
0.20 + 0.02

300.0000 V

3 Hz – 5 Hz
5 Hz – 10 Hz
10 Hz – 20 kHz
20 kHz – 50 kHz
50 kHz – 100 kHz
100 kHz – 300 kHz [5]

1.00 + 0.05
0.35 + 0.05
0.04 + 0.05
0.10 + 0.10
0.55 + 0.20
4.00 + 1.25

1.00 + 0.08
0.35 + 0.08
0.05 + 0.08
0.11 + 0.12
0.60 + 0.20
4.00 + 1.25

1.00 + 0.08
0.35 + 0.08
0.06 + 0.08
0.12 + 0.12
0.60 + 0.20
4.00 + 1.25

0.100 + 0.008
0.035 + 0.008
0.005 + 0.008
0.011 + 0.012
0.060 + 0.020
0.20 + 0.05

0.10
0.05
0.03
0.006

0.10
0.05
0.03
0.01

0.10
0.05
0.03
0.01

0.005
0.005
0.001
0.001

3 Hz – 5 Hz
5 Hz – 10 Hz
10 Hz – 5 kHz

1.00 + 0.04
0.30 + 0.04
0.10 + 0.04

1.00 + 0.04
0.30 + 0.04
0.10 + 0.04

1.00 + 0.04
0.30 + 0.04
0.10 + 0.04

0.100 + 0.006
0.035 + 0.006
0.015 + 0.006

100.0000 mA [7] 3 Hz – 5 Hz
5 Hz – 10 Hz
10 Hz – 5 kHz

1.00 + 0.5
0.30 + 0.5
0.10 + 0.5

1.00 + 0.5
0.30 + 0.5
0.10 + 0.5

1.00 + 0.5
0.30 + 0.5
0.10 + 0.5

0.100 + 0.06
0.035 + 0.06
0.015 + 0.06

100 mV
to
300 V
10.00000 mA [4]
and
1.000000 A [4]

3 Hz – 5 Hz
5 Hz – 10 Hz
10 Hz – 40 Hz
40 Hz – 300 kHz

Additional Low Frequency Error for ACV, ACI (% of reading)
Frequency
10 Hz - 20 Hz
20 Hz - 40 Hz
40 Hz - 100 Hz
100 Hz - 200 Hz
200 Hz - 1 kHz
> 1 kHz

AC Filter
Slow
0
0
0
0
0
0

AC Filter
Medium
0.74
0.22
0.06
0.01
0
0

AC Filter
Fast
—
—
0.73
0.22
0.18
0

Additional Error for Frequency, Period (% of reading)
Frequency
3 Hz - 5 Hz
5 Hz - 10 Hz
10 Hz - 40 Hz
40 Hz - 100 Hz
100 Hz - 300 Hz
300 Hz - 1 kHz
> 1 kHz

61⁄2 Digits
0
0
0
0
0
0
0

51⁄2 Digits
0.12
0.17
0.2
0.06
0.03
0.01
0

41⁄2 Digits
0.12
0.17
0.2
0.21
0.21
0.07
0.02

[1] Specifications are for 1 hour warm up and 61 ⁄2 digits, Slow ac filter
[2] Relative to calibration standards
[3] 20% over range on all ranges except 300 Vac and 1 Aac ranges
[4] For sinewave input > 5% of range. For inputs from 1% to 5% of range and < 50 kHz, add 0.1% of range additional error.
[5] Typically 30% of reading error at 1 MHz, limited to 1x108 V Hz
[6] Input > 100 mV. For 10 mV to 100 mV inputs, multiply % of reading error x 10.
[7] Specified only for inputs > 10 mA

18

Chapter 1 Specifications
AC Measurement and Operating Characteristics

1
AC Measurement and Operating Characteristics
AC Measurement Characteristics [1]

AC Operating Characteristics [4]

True RMS AC Voltage
Measurement Method:

Function
ACV, ACI:

Crest Factor:
Additional Crest Factor
Errors (non-sinewave): [2]

AC-coupled True RMS – measures
the ac component of input with up
to 300 Vdc of bias on any range
Maximum 5:1 at Full Scale
Crest Factor 1-2:
Crest Factor 2-3:
Crest Factor 3-4:
Crest Factor 4-5:

0.05% of reading
0.15% of reading
0.30% of reading
0.40% of reading

AC Filter Bandwidth:
Slow
Medium
Fast
Input Impedance:
Input Protection:

3 Hz – 300 kHz
20 Hz – 300 kHz
200 Hz – 300 kHz
1 MΩ ± 2%, in parallel with 150 pF
300 Vrms on all ranges

Frequency and Period
Measurement Method:
Voltage Ranges:
Gate Time:
Measurement Timeout:

Reciprocal counting technique
Same as AC Voltage function
1s, 100 ms, or 10 ms
Selectable 3 Hz, 20 Hz, 200 Hz LF limit

True RMS AC Current
Measurement Method:

Shunt Resistance:
Input Protection:

Direct coupled to the fuse and
shunt. AC-coupled True RMS
measurement (measures the
ac component only)
5Ω for 10 mA; 0.1Ω for 100 mA, 1A
1.5A 250 V fuse on 34901A module

Measurement Noise Rejection [3]
AC CMRR:

70 dB

Digits [5]
61 ⁄2
61 ⁄2
61 ⁄2
61 ⁄2
6 1/2

Readings/s
7 sec/reading
1
8 [6]
10
100 [7]

AC Filter
Slow (3 Hz)
Medium (20 Hz)
Fast (200 Hz)
Fast (200 Hz)
Fast (200 Hz)

Single Channel Measurement Rates [8]
Function
ACV:

Resolution
61 ⁄2 Slow (3 Hz)
61 ⁄2 Medium (20 Hz)
61 ⁄2 Fast (200 Hz)
6 1/2 [7]

Frequency, Period:

61 ⁄2 Digits (1s gate)
51 ⁄2 Digits (100 ms)
41 ⁄2 Digits (10 ms)

Readings/s
0.14
1
8
100
1
9
70

[1] 300 Vrms isolation voltage (ch-ch, ch-earth)
[2] For frequencies below 100 Hz, slow AC filter specified for
sinewave input only
[3] For 1 kΩ unbalance in LO lead
[4] Maximum reading rates for 0.01% of ac step additional error.
Additional settling delay required when input dc level varies.
[5] 61 ⁄2 digits=22 bits, 51 ⁄2 digits=18 bits, 41 ⁄2 digits=15 bits
[6] For external trigger or remote operation using default
settling delay (Delay Auto)
[7] Maximum limit with default settling delays defeated
[8] For fixed function and range, readings to memory,
scaling and alarms turned off

Measurement Considerations (Frequency and Period)
All frequency counters are susceptible to error when measuring
low-voltage, low-frequency signals. Shielding inputs from
external noise pickup is critical for minimizing measurement errors.

19

Chapter 1 Specifications
Measurement Rates and System Characteristics

Measurement Rates and System Characteristics
Single Channel Measurement Rates [1]

[2]

System Characteristics

Function
DCV, 2-Wire Ohms:

Resolution
61 ⁄2 (10 PLC)
51 ⁄2 (1 PLC)
41 ⁄2 (0.02 PLC)

Thermocouple:

0.1 °C (1 PLC)
0.1 °C (0.02 PLC)

49 (47)
280

RTD, Thermistor:

0.01 °C (10 PLC)
0.1 °C (1 PLC)
1 °C (0.02 PLC)

6 (5)
47 (47)
280

61 ⁄2 Slow (3 Hz)
61 ⁄2 Medium (20 Hz)
61 ⁄2 Fast (200 Hz)
61 ⁄2 [3]

0.14
1
8
100

61 ⁄2 Digits (1s gate)
51 ⁄2 Digits (100 ms)
41 ⁄2 Digits (10 ms)

1
9
70

ACV:

Frequency, Period:

Readings/s
6 (5)
53 (47)
490

System Speeds [4]
INTO Memory
Single Channel DCV
34902A Scanning DCV
34907A Scanning Digital Input
34902A Scanning DCV, scaling and 1 alarm fail
34907A Scanning Totalize
34902A Scanning Temperature
34902A Scanning ACV [3]
34902A Scanning DCV/Ohms, alternate channels
34901A/34908A Scanning DCV

Ch/s
490
250
250
220
170
160
100
90
60

INTO and OUT of Memory to GPIB or RS-232 (INIT, FETCh)
34902A Scanning DCV
180
34902A Scanning DCV with Time stamp
150
[5]

OUT of Memory to GPIB
Readings
Readings with Time stamp
Readings with all Format Options ON

800
450
310

OUT of Memory to RS-232
Readings
Readings with Time stamp
Readings with all Format Options ON

600
320
230

DIRECT to GPIB or RS-232
Single Channel DCV
34902A Scanning DCV
Single Channel MEAS DCV 10 or MEAS DCV 1
Single Channel MEAS DCV or MEAS OHMS

440
200
25
12

20

Scan Triggering
Scan Count:
Scan Interval:
Channel Delay:
External Trig Delay:
External Trig Jitter:
Alarms
Alarm Outputs:
Latency:
Memory
Readings:
Time Stamp Resolution:
Relative
Absolute
States:
Alarm Queue:
General Specifications
Power Supply:
Power Line Frequency:
Power Consumption:
Operating Environment:
Storage Environment:
Weight (Mainframe):
Safety:
RFI and ESD:
Warranty:

1 to 50,000 or continuous
0 to 99 hours; 1 ms step size
0 to 60 seconds/channel; 1 ms step size
< 300 µs; With Monitor On, < 200 ms
< 2 ms
4 TTL compatible. Selectable TTL logic
HI or LO on Fail
5 ms (typical)
Battery Backed, 4 year typical life [6]
50,000 readings
1 ms
1s
5 instrument states
Up to 20 events
100 V / 120 V / 220 V / 240 V ±10%
45 Hz to 66 Hz automatically sensed
(12 W) 25 VA peak
Full accuracy for 0 °C to 55 °C
Full accuracy to 80% R.H. at 40 °C
-40 °C to 70 °C [6]
Net: 3.6 kg (8.0 lbs)
IEC 61010-1:2001 / EN 61010-1:2001
Canada: CSA C22.2 No. 61010-1:2004
UL 61010-1:2004
CISPR 11, IEC 801/2/3/4
1 year

[1] Reading speeds for 60 Hz and (50 Hz) operation; autozero OFF
[2] For fixed function and range, readings to memory,
scaling and alarms off, autozero OFF
[3] Maximum limit with default settling delays defeated
[4] Speeds are for 41 ⁄2 digits, delay 0, display off, autozero off.
Using 115 kbaud RS-232 setting.
[5] Assumes relative time format (time since start of scan)
[6] Storage at temperatures above 40 °C will decrease battery life

This ISM device complies with Canadian ICES-001.
Cet appareil ISM est conforme à la norme NMB-001
du Canada.

N10149

Chapter 1 Specifications
Module Specifications

1
Module Specifications
34901A, 34902A, 34908A, 34903A, 34904A
Multiplexer
General

34901A

Number of Channels
Connects to Internal DMM

34902A

34908A

Actuator

Matrix

34903A

34904A

20+2

16

40

20

4x8

2/4 wire

2/4 wire

1 wire

SPDT

2 wire

No

No

Yes

Yes

Yes

Scanning Speed [1]

60 ch/s

250 ch/s

60 ch/s

Open/Close Speed

120/s

120/s

70/s

120/s

120/s
300 V

Maximum Input
Voltage (dc, ac rms)

300 V

300 V

300 V

300 V

Current (dc, ac rms)

1A

50 mA

1A

1A

1A

50 W

2W

50 W

50 W

50 W

300 V

300 V

300 V

300 V

300 V
< 3 µV

Power (W, VA)
Isolation (ch-ch, ch-earth)

dc, ac rms

DC Characteristics
Offset Voltage [2]

< 3 µV

< 6 µV

< 3 µV

< 3 µV

Initial Closed Channel R [2]

< 1Ω

< 1Ω

< 1Ω

< 0.2Ω

< 1Ω

Isolation (ch-ch, ch-earth)

> 10 G Ω

> 10 GΩ

> 10 GΩ

> 10 GΩ

> 10 GΩ
10 MHz

AC Characteristics
Bandwidth

10 MHz

10 MHz

10 MHz

10 MHz

Ch-Ch Cross Talk (dB) [3]

10 MHz

-45

-45

-18 [4]

-45

-33

Capacitance

HI to LO

< 50 pF

< 50 pF

< 50 pF

< 10 pF

< 50 pF

Capacitance

LO to Earth

< 80 pF

< 80 pF

< 80 pF

< 80 pF

< 80 pF

108

108

108

108

108

(typical)

0.8 °C

0.8 °C

0.8 °C [7]

No Load (typical)

100M

100M

100M

100M

100M

100k

100k

100k

100k

100k

Volt-Hertz Limit
Other
T/C Cold Junction Accuracy [2] [5]
Switch Life
[6]

Switch Life

Rated Load (typical)

Temperature

Operating

Temperature

Storage

Humidity (non-condensing)

All Modules – 0 °C to 55 °C
All Modules – -20 °C to 70 °C
All Modules – 40 °C / 80% R.H.

[1] Speeds are for 41 ⁄2 digits, delay 0, display off, autozero off. Using 115 kbaud RS-232 setting.
[2] Errors included in the DMM measurement accuracy specifications
[3] 50Ω source, 50Ω load
[4] Isolation within channel 1 to 20 or 21 to 40 banks is -40 dB
[5] Thermocouple specifications not guaranteed when 34907A module is present
[6] Applies to resistive loads only
[7] Thermocouple measurements not recommended with 34908A module due to common LO configuration.

21

Chapter 1 Specifications
Module Specifications

Module Specifications
34905A, 34906A
RF Multiplexer
General
Number of Channels

34905A

34906A

Dual 1x4
50Ω

Dual 1x4
75Ω

The ac performance graphs are shown on the following page.
AC Characteristics

60/s

Insertion Loss (dB)
MHz

Voltage (dc, ac rms)

42 V

MHz

Current (dc, ac rms)

0.7 A

Power (W, VA)

20 W

Open/Close Speed
Maximum Input

DC Characteristics
Offset Voltage

[1]

< 6 µV

Initial Closed Channel R [1]

< 0.5Ω

Isolation (ch-ch, ch-earth)

> 1 GΩ

SWR
MHz

Other
Switch Life

No Load (typical)

Switch Life

Rated Load (typical) [2]

Temperature

Operating

Temperature

Storage

Humidity (non-condensing)

5M
100k
-20 °C to 70 °C

34906A

2 GHz

2 GHz

10

-0.1

-0.1

100

-0.4

-0.4

500 MHz

-0.6

-0.5

1 GHz

-1.0

-1.0

1.5 GHz

-1.2

-1.5

2 GHz

-3.0

-2.0

10 MHz
100

1.02

1.02

1.05

1.05

500 MHz

1.20

1.25

1 GHz

1.20

1.40

1.5 GHz

1.30

1.40

2 GHz

1.40

2.00

Ch-Ch Cross Talk (dB) [4] 10 MHz

-100

-85

-85

-75

0 °C to 55 °C
40 °C / 80% R.H.

34905A

Bandwidth [3]

MHz

100
500 MHz

-65

-65

1 GHz

-55

-50

1.5 GHz

-45

-40

2 GHz

-35

-35

Risetime

< 300 ps

Signal Delay
Capacitance
LO
Volt-Hertz Limit

< 3 ns
HI to

< 20 pF
1010

[1] Errors included in DMM measurement accuracy specifications
[2] Applies to resistive loads only
[3] Bandwidth direct to module SMB connectors
[4] 50 ohm source, 50 ohm load

22

Chapter 1 Specifications
Typical AC Performance Graphs

1
Typical AC Performance Graphs
34905A, 34906A
Insertion Loss (50Ω)

Insertion Loss (75Ω)

Direct to Module
Using provided adapter cables

VSWR (50Ω)

VSWR (75Ω)

Crosstalk (50Ω)

Crosstalk (75Ω)

23

Chapter 1 Specifications
Module Specifications

Module Specifications

Software Specifications

34907A
Digital Input / Output

BenchLink Data Logger (not included with Option 001)

Port 1, 2:
Vin(L):
Vin(H):
Vout(L):
Vout(H):
Vin(H) Max:
Alarming:
Speed
Latency
Read/Write Speed:

8 Bit, input or output, non-isolated
< 0.8V (TTL)
> 2.0V (TTL)
< 0.8V @ Iout = - 400 mA
> 2.4V @ Iout = 1 mA
< 42V with external open drain pull-up
Maskable pattern match or state change
4 ms (max) alarm sampling
5 ms (typical) to 34970A alarm output
95/s

System Requirements [1]
486, 66 MHz, 16 MB RAM,
PC Hardware:
12 MB disk space
Windows® 3.1, Windows 95,
Operating System:
Windows NT® 4.0
Computer Interfaces [2]
GPIB:
Keysight 82335B, 82340A/B/C,
82341A/B/C/D
National Instruments AT-GPIB/TNT,
PCI-GPIB
LAN-to-GPIB:
Keysight E5810A (Windows 98/Me/
NT/2000/XP Professional)
RS-232 (Serial Port):
PC COM 1 to 4
[3]
Performance
Scan and Save to Disk: 100 ch/s, 2 strip charts displayed

226 - 1 (67,108,863)
100 kHz (max), rising or falling edge,
programmable
1 Vp-p (min)
42 Vpk (max)
0V or TTL, jumper selectable
TTL-Hi, TTL-Lo, or none
Manual or Read+Reset
85/s

[1] Software provided on CD-ROM; includes utility to create
floppy disks for installation
[2] Interface and drivers must be purchased and installed separately
[3] 90 MHz Pentium®, 20 MB RAM

Totalize Input
Maximum Count:
Totalize Input:
Signal Level:
Threshold:
Gate Input:
Count Reset:
Read Speed:

Analog Voltage (DAC) Output
DAC 1, 2:
Resolution:
Iout:
Settling Time:
Accuracy:
±5 ° C
1 year
Temp Coefficient:

±12V, non-isolated (earth referenced)

1 mV
10 mA max [1]
1 ms to 0.01% of output
±(% of output + mV)
0.25% + 20 mV
±(0.015% + 1 mV) / °C

[1] Limited to 40 mA total for all three slots (six DAC channels)

24

Chapter 1 Specifications
Product and Module Dimensions

1
Product and Module Dimensions

103.6 mm

254.4 mm

374.0 mm

88.5 mm

212.6 mm

348.3 mm

Module

TOP
315.6

91.9

All dimensions are shown
in millimeters.

25

Chapter 1 Specifications
To Calculate Total Measurement Error

To Calculate Total Measurement Error
Each specification includes correction factors which account for errors
present due to operational limitations of the internal DMM. This section
explains these errors and shows how to apply them to your measurements.
Refer to “Interpreting Internal DMM Specifications,” starting on page
28, to get a better understanding of the terminology used and to help
you interpret the internal DMM’s specifications.
The internal DMM’s accuracy specifications are expressed in the form:
(% of reading + % of range). In addition to the reading error and range
error, you may need to add additional errors for certain operating
conditions. Check the list below to make sure you include all measurement
errors for a given function. Also, make sure you apply the conditions as
described in the footnotes on the specification pages.
• If you are operating the internal DMM outside the 23 °C ± 5 °C
temperature range specified, apply an additional temperature
coefficient error.
• For dc voltage, dc current, and resistance measurements, you may
need to apply an additional reading speed error.
• For ac voltage and ac current measurements, you may need to apply
an additional low frequency error or crest factor error.
Understanding the “ % of reading ” Error The reading error
compensates for inaccuracies that result from the function and range
you select, as well as the input signal level. The reading error varies
according to the input level on the selected range. This error is
expressed in percent of reading. The following table shows the reading
error applied to the internal DMM’s 24-hour dc voltage specification.

26

Range

Input Level

Reading Error
(% of reading)

Reading
Error Voltage

10 Vdc
10 Vdc
10 Vdc

10 Vdc
1 Vdc
0.1 Vdc

0.0015
0.0015
0.0015

≤ 150 µV
≤ 15 µV
≤ 1.5 µV

Chapter 1 Specifications
To Calculate Total Measurement Error

1
Understanding the “ % of range ” Error The range error compensates
for inaccuracies that result from the function and range you select.
The range error contributes a constant error, expressed as a percent of
range, independent of the input signal level. The following table shows
the range error applied to the DMM’s 24-hour dc voltage specification.

Range

Input Level

Range Error
(% of range)

Range
Error Voltage

10 Vdc
10 Vdc
10 Vdc

10 Vdc
1 Vdc
0.1 Vdc

0.0004
0.0004
0.0004

≤ 40 µV
≤ 40 µV
≤ 40 µV

Total Measurement Error To compute the total measurement error,
add the reading error and range error. You can then convert the total
measurement error to a “percent of input” error or a “ppm (part-permillion) of input” error as shown below.
% of input error

=

ppm of input error =

Total Measurement Error
× 100
Input Signal Level
Total Measurement Error
× 1,000,000
Input Signal Level

Example: Computing Total Measurement Error

Assume that a 5 Vdc signal is input to the DMM on the 10 Vdc range.
Compute the total measurement error using the 90-day accuracy
specification of ±(0.0020% of reading + 0.0005% of range).
Reading Error

= 0.0020% x 5 Vdc

= 100 µV

Range Error

= 0.0005% x 10 Vdc

= 50 µV

Total Error

= 100 µV + 50 µV

= ± 150 µV
= ± 0.0030% of 5 Vdc
= ± 30 ppm of 5 Vdc

27

Chapter 1 Specifications
Interpreting Internal DMM Specifications

Interpreting Internal DMM Specifications
This section is provided to give you a better understanding of the
terminology used and will help you interpret the internal DMM’s
specifications.

Number of Digits and Overrange
The “number of digits” specification is the most fundamental, and
sometimes, the most confusing characteristic of a multimeter.
The number of digits is equal to the maximum number of “9’s” the
multimeter can measure or display. This indicates the number of
full digits. Most multimeters have the ability to overrange and add
a partial or “1⁄2” digit.
For example, the internal DMM can measure 9.99999 Vdc on the 10 V
range. This represents six full digits of resolution. The internal DMM
can also overrange on the 10 V range and measure up to a maximum of
12.00000 Vdc. This corresponds to a 61⁄2-digit measurement with 20%
overrange capability.

Sensitivity
Sensitivity is the minimum level that the multimeter can detect for a
given measurement. Sensitivity defines the ability of the multimeter to
respond to small changes in the input level. For example, suppose you
are monitoring a 1 mVdc signal and you want to adjust the level to
within ±1 µV. To be able to respond to an adjustment this small, this
measurement would require a multimeter with a sensitivity of at least
1 µV. You could use a 61⁄2-digit multimeter if it has a 1 Vdc or smaller
range. You could also use a 41⁄2-digit multimeter with a 10 mVdc range.
For ac voltage and ac current measurements, note that the smallest
value that can be measured is different from the sensitivity. For the
internal DMM, these functions are specified to measure down to 1% of
the selected range. For example, the internal DMM can measure down
to 1 mV on the 100 mV range.

28

Chapter 1 Specifications
Interpreting Internal DMM Specifications

1
Resolution
Resolution is the numeric ratio of the maximum displayed value divided
by the minimum displayed value on a selected range. Resolution is
often expressed in percent, parts-per-million (ppm), counts, or bits.
For example, a 61⁄2-digit multimeter with 20% overrange capability can
display a measurement with up to 1,200,000 counts of resolution.
This corresponds to about 0.0001% (1 ppm) of full scale, or 21 bits
including the sign bit. All four specifications are equivalent.

Accuracy
Accuracy is a measure of the “exactness” to which the internal DMM’s
measurement uncertainty can be determined relative to the calibration
reference used. Absolute accuracy includes the Internal DMM’s relative
accuracy specification plus the known error of the calibration reference
relative to national standards (such as the U.S. National Institute of
Standards and Technology). To be meaningful, the accuracy specifications
must be accompanied with the conditions under which they are valid.
These conditions should include temperature, humidity, and time.
There is no standard convention among multimeter manufacturers for
the confidence limits at which specifications are set. The table below
shows the probability of non-conformance for each specification with the
given assumptions.
Specification
Criteria

Probability
of Failure

Mean ± 2 sigma
Mean ± 3 sigma

4.5%
0.3%

Variations in performance from reading to reading, and instrument
to instrument, decrease for increasing number of sigma for a given
specification. This means that you can achieve greater actual
measurement precision for a specific accuracy specification number.
The 34970A is designed and tested to meet performance better than
mean ±3 sigma of the published accuracy specifications.

29

Chapter 1 Specifications
Interpreting Internal DMM Specifications

24-Hour Accuracy
The 24-hour accuracy specification indicates the internal DMM’s
relative accuracy over its full measurement range for short time
intervals and within a stable environment. Short-term accuracy is
usually specified for a 24-hour period and for a ±1 °C temperature
range.

90-Day and 1-Year Accuracy
These long-term accuracy specifications are valid for a 23 °C ± 5 °C
temperature range. These specifications include the initial calibration
errors plus the internal DMM’s long-term drift errors.

Temperature Coefficients
Accuracy is usually specified for a 23 °C ± 5 °C temperature range.
This is a common temperature range for many operating environments.
You must add additional temperature coefficient errors to the accuracy
specification if you are operating the multimeter outside a 23 °C ± 5 °C
temperature range (the specification is per °C).

30

Chapter 1 Specifications
Configuring for Highest Accuracy Measurements

1
Configuring for Highest Accuracy Measurements
The measurement configurations shown below assume that the internal
DMM is in its Factory Reset state. It is also assumed that manual
ranging is enabled to ensure proper full scale range selection.
DC Voltage, DC Current, and Resistance Measurements:
• Set the resolution to 6 digits (you can use the 6 digits slow mode for
further noise reduction).
• Set the input resistance to greater than 10 GΩ (for the 100 mV, 1 V,
and 10 V ranges) for the best dc voltage accuracy.
• Use 4-wire ohms and enable offset compensation for the best
resistance accuracy.
AC Voltage and AC Current Measurements:
• Set the resolution to 6 digits.
• Select the slow ac filter (3 Hz to 300 kHz).
Frequency and Period Measurements:
• Set the resolution to 6 digits.

31

32

2

2

Quick Start

Quick Start
One of the first things you will want to do with your instrument is to
become acquainted with the front panel. We have written the exercises
in this chapter to prepare the instrument for use and help you get
familiar with some of its front-panel operations.
The front panel has several groups of keys to select various functions
and operations. A few keys have a shifted function printed in blue below
the key. To perform a shifted function, press
(the SHIFT annunciator
will turn on). Then, press the key that has the desired label below it.
For example, to select the Utility Menu, press
.
If you accidentally press
annunciator.

, just press it again to turn off the SHIFT

This chapter is divided into the following sections:
• To Prepare the Instrument for Use, on page 35
• To Connect Wiring to a Module, on page 36
• To Set the Time and Date, on page 38
• To Configure a Measurement Channel, on page 39
• To Monitor a Single Channel, on page 40
• To Close a Channel, on page 41
• If the Instrument Does Not Turn On, on page 42
• To Adjust the Carrying Handle, on page 44
• To Rack Mount the Instrument, on page 45

34

Chapter 2 Quick Start
To Prepare the Instrument for Use

To Prepare the Instrument for Use

2
1 Check the list of supplied items.
Verify that you have received the following items with your instrument. If
anything is missing, contact your nearest Keysight Technologies Sales Office.
One power cord.
One User’s Guide.
This Service Guide.
One Quick Reference Guide.
Certificate of Calibration (if you ordered the internal DMM).
Quick Start Kit (if you ordered the internal DMM):
• One RS-232 cable.
• BenchLink Data Logger Software CD-ROM.
• One J-type thermocouple and a flatblade screwdriver.
Any plug-in modules that you ordered are delivered in a separate
shipping container.
On/Standby
Switch
WARNING
Note that this switch
is Standby only.
To disconnect the
mains from the
instrument, remove
the power cord.

2 Connect the power cord and turn on the instrument.
The front-panel display will light up briefly while the instrument
performs its power-on self-test. The GPIB address is displayed.
The instrument initially powers up with all measurement channels
turned off. To review the power-on display with all annunciators
turned on, hold down
as you turn on the instrument. If the
instrument does not turn on properly, see page 42.
3 Perform a complete self-test.
The complete self-test performs a more extensive set of tests than those
performed at power-on. Hold down
as you turn on the instrument
and hold down the key until you hear a long beep. The self-test will begin
when you release the key following the beep.

35

Chapter 2 Quick Start
To Connect Wiring to a Module

To Connect Wiring to a Module
1 Remove the module cover.

2 Connect wiring to the screw terminals.

20 AWG Typical
6 mm

3 Route wiring through strain relief.

4 Replace the module cover.

Cable Tie Wrap
(optional)

5 Install the module into mainframe.
Channel Number:
Slot Channel

36

Wiring Hints...
• For detailed information on each module,
refer to the 34970A User’s Guide.
• To reduce wear on the internal DMM relays,
wire like functions on adjacent channels.
• Use shielded twisted pair PTFE â insulated
cables to reduce settling and noise errors.
• The diagrams on the next page show how to
connect wiring to a multiplexer module for
each measurement function.

Chapter 2 Quick Start
To Connect Wiring to a Module

Thermocouple

Thermocouple Types: B, E, J, K, N, R, S, T

2-Wire Ohms / RTD / Thermistor

2

DC Voltage / AC Voltage / Frequency

Ranges: 100 mV, 1 V, 10 V, 100 V, 300 V

4-Wire Ohms / RTD

Ranges: 100, 1 k, 10 k, 100 k, 1 M, 10 M, 100 MΩ
RTD Types: 0.00385, 0.00391
Thermistor Types: 2.2 k, 5 k, 10 k

DC Current / AC Current

Channel n (source) is automatically paired with
Channel n+10 (sense) on the 34901A or
Channel n+8 (sense) on the 34902A.
Valid only on channels 21 and 22 on the 34901A.
Ranges: 10 mA, 100 mA, 1A

Ranges: 100, 1 k, 10 k, 100 k, 1 M, 10 M, 100 MΩ
RTD Types: 0.00385, 0.00391

37

Chapter 2 Quick Start
To Set the Time and Date

To Set the Time and Date
All readings during a scan are automatically time stamped and stored in
non-volatile memory. In addition, alarm data is time stamped and
stored in a separate non-volatile memory queue.
1 Set the time of day.
Utility

Use
and
to select the field to modify and turn the knob to change
the value. You can also edit the AM/PM field.
TIME 03:45 PM

2 Set the date.
Utility

Use
and
the value.

to select the field to modify and turn the knob to change

JUNE 01 2002

38

Chapter 2 Quick Start
To Configure a Measurement Channel

To Configure a Measurement Channel
Use this general procedure to configure a measurement channel.

2

1 Select the channel.
Turn the knob until the desired channel is shown on the right side of
front-panel display. The channel number is a three-digit number;
the left-most digit represents the slot number (100, 200, or 300) and the
two digits on the right indicate the channel number (102, 110, etc.).
Note: You can use
or next slot.

and

to skip to the beginning of the previous

2 Select the measurement parameters for the selected channel.
Use the knob to scroll through the measurement choices on each level
of the menu. When you press
to make your selection, the menu
automatically guides you through all relevant choices to configure a
measurement on the selected function. When you have finished
configuring the parameters, you are automatically exited from the menu.
The present selection (or default) is displayed in full bright for easy
identification. When you make a different selection, the new choice is
shown in full bright and it becomes the default selection. The order of
the choices always remains the same; however, you always enter the
menu at the present (full-bright) setting for each parameter.
Note: The menu will timeout after about 20 seconds of inactivity and
any changes made previously will take effect.

39

Chapter 2 Quick Start
To Monitor a Single Channel

To Monitor a Single Channel
You can use the Monitor function to continuously take readings on a single
channel, even during a scan. This feature is used during front panel
calibration procedures.
1 Select the channel to be monitored.
Only one channel can be monitored at a time but you can change the
channel being monitored at any time by turning the knob.
2 Enable monitoring on the selected channel.
Any channel that can be “read” by the instrument can be monitored
(the MON annunciator turns on). This includes any combination of
temperature, voltage, resistance, current, frequency, or period
measurements on multiplexer channels. You can also monitor a digital
input port or the totalizer count on the multifunction module.
To disable monitoring, press

40

again.

Chapter 2 Quick Start
To Close a Channel

To Close a Channel
On the multiplexer and switch modules, you can close and open individual
relays on the module. However, note that if you have already configured
any multiplexer channels for scanning, you cannot independently close
and open individual relays on that module.
1 Select the channel.
Turn the knob until the desired channel is shown on the right side of
front-panel display. For this example, select channel 213.
2 Close the selected channel.
3 Open the selected channel.
Note:
will sequentially open all channels on the module in the
selected slot.
The table below shows the low-level control operations available for each
of the plug-in modules.
Plug-In Module
34901A
34902A
34908A
34903A
34904A
34905A
34906A
34907A
34907A
34907A

20-Channel Mux
16-Channel Mux
40-Channel Single-Ended Mux [1]
20-Channel Actuator
4x8 Matrix
Dual 4-Channel RF Mux (50Ω ) [2]
Dual 4-Channel RF Mux (75Ω) [2]
Multifunction Module (DIO)
Multifunction Module (Totalizer)
Multifunction Module (DAC)

•
•
•
•
•
•
•

•
•
•
•
•

,
•
•
•

•
•
•

•
•

•

•
•

•

[1] Only one channel can be closed at a time on this module.
[2] Only one channel in each bank can be closed at a time on this module.

41

2

Chapter 2 Quick Start
If the Instrument Does Not Turn On

If the Instrument Does Not Turn On
Use the following steps to help solve problems you might encounter
when turning on the instrument.
1 Verify that there is ac power to the instrument.
First, verify that the power cord is firmly plugged into the power
receptacle on the rear panel of the instrument. You should also make
sure that the power source you plugged the instrument into is
energized. Then, verify that the instrument is turned on.
The On/Standby switch

is located on the lower left side of the front panel.

2 Verify the power-line voltage setting.
The line voltage is set to the proper value for your country when the
instrument is shipped from the factory. Change the voltage setting if
it is not correct. The settings are: 100, 120, 220, or 240 Vac.
Note: For 127 Vac operation, use the 120 Vac setting.
For 230 Vac operation, use the 220 Vac setting.
See the next page if you need to change the line-voltage setting.
3 Verify that the power-line fuse is good.
The instrument is shipped from the factory with a 500 mA fuse installed.
This is the correct fuse for all line voltages.
See the next page if you need to replace the power-line fuse.

To replace the 500 mAT, 250 V fuse, order Keysight part number 2110-0458.

42

Chapter 2 Quick Start
If the Instrument Does Not Turn On

1 Remove the power cord. Remove the
fuse-holder assembly from the rear panel.

2 Remove the line-voltage selector from
the assembly.

2

Fuse: 500 mAT (for all line voltages)
Keysight Part Number: 2110-0458

3 Rotate the line-voltage selector until the
correct voltage appears in the window.

4 Replace the fuse-holder assembly in
the rear panel.

100, 120 (127), 220 (230) or 240 Vac

Verify that the correct line voltage is selected and the power-line fuse is good.

43

Chapter 2 Quick Start
To Adjust the Carrying Handle

To Adjust the Carrying Handle
To adjust the position, grasp the handle by the sides and pull outward.
Then, rotate the handle to the desired position.

Benchtop Viewing Positions

44

Carrying Position

Chapter 2 Quick Start
To Rack Mount the Instrument

To Rack Mount the Instrument
You can mount the instrument in a standard 19-inch rack cabinet using
one of three optional kits available. Instructions and mounting
hardware are included with each rack-mounting kit. Any System II
instrument of the same size can be rack-mounted beside the 34970A.
Remove the carrying handle, and the front and rear rubber bumpers,
before rack-mounting the instrument.

To remove the handle, rotate it to the vertical position and pull the ends outward.

Front

Rear (bottom view)

To remove the rubber bumper, stretch a corner and then slide it off.

45

2

Chapter 2 Quick Start
To Rack Mount the Instrument

To rack mount a single instrument, order adapter kit 5063-9240.

To rack mount two instruments side-by-side, order lock-link kit 5061-9694 and
flange kit 5063-9212. Be sure to use the support rails inside the rack cabinet.

To install one or two instruments in a sliding support shelf, order shelf 5063-9255,
and slide kit 1494-0015 (for a single instrument, also order filler panel 5002-3999).

46

3

3

Front-Panel
Overview

Front-Panel Overview
This chapter introduces you to the front-panel keys and menu operation.
This chapter does not give a detailed description of every front-panel key or
menu operation. It does, however, give you a good overview of the frontpanel menu and many front-panel operations. See the Keysight 34970A
User’s Guide for a complete discussion of the instrument’s capabilities and
operation.
This chapter is divided into the following sections:
• Front-Panel Menu Reference, on page 49
• To Unsecure for Calibration, on page 51
• To Secure Against Calibration, on page 51
• To Change the Security Code, on page 52
• Error Messages, on page 52
• To Perform a Zero Adjustment, on page 53
• To Apply Mx+B Scaling to Measurements, on page 54
• To Read the Relay Cycle Count, on page 55
• To Read a Digital Input Port, on page 56
• To Write to a Digital Output Port, on page 57
• To Read the Totalizer Count, on page 58
• To Output a DC Voltage, on page 59

48

Chapter 3 Front-Panel Overview
Front-Panel Menu Reference

Front-Panel Menu Reference
This section gives an overview of the front-panel menus. The menus are
designed to automatically guide you through all parameters required to
configure a particular function or operation. The remainder of this
chapter shows examples of using the front-panel menus.

3

Configure the measurement parameters on the displayed channel.
• Select measurement function (dc volts, ohms, etc.) on the displayed channel.
• Select transducer type for temperature measurements.
• Select units (°C, °F, or K) for temperature measurements.
• Select measurement range or autorange.
• Select measurement resolution.
• Copy and paste measurement configuration to other channels.

Configure the scaling parameters for the displayed channel.
• Set the gain (“M”) and offset (“B”) value for the displayed channel.
• Make a null measurement and store it as the offset value.
• Specify a custom label (RPM, PSI, etc.) for the displayed channel.

Configure alarms on the displayed channel.
• Select one of four alarms to report alarm conditions on the displayed channel.
• Configure a high limit, low limit, or both for the displayed channel.
• Configure a bit pattern which will generate an alarm (for digital input channels).

Configure the four Alarm Output hardware lines.
• Clear the state of the four alarm output lines.
• Select the “Latch” or “Track” mode for the four alarm output lines.
• Select the slope (rising or falling edge) for the four alarm output lines.

Configure the event or action that controls the scan interval.
• Select the scan interval mode (interval, manual, external, or alarm).
• Select the scan count.

49

Chapter 3 Front-Panel Overview
Front-Panel Menu Reference

Configure the advanced measurement features on displayed channel.
• Set the integration time for measurements on the displayed channel.
• Set the channel-to-channel delay for scanning.
• Enable/disable the thermocouple check feature (T/C measurements only).
• Select the reference junction source (T/C measurements only).
• Set the low frequency limit (ac measurements only).
• Enable/disable offset compensation (resistance measurements only).
• Select the binary or decimal mode for digital operations (34907A only).
• Configure the totalizer reset mode (totalizer only).
• Select which edge is detected (rising or falling) for totalizer operations.

Configure system-related instrument parameters.
• Set the real-time system clock and calendar.
• Query the firmware revisions for the mainframe and installed modules.
• Select the instrument’s power-on configuration (last or factory reset).
• Enable/disable the internal DMM.
• Secure/unsecure the instrument for calibration.

View readings, alarms, and errors.
• View the last 100 scanned readings from memory (last, min, max, and average).
• View the first 20 alarms in the alarm queue (reading and time alarm occurred).
• View up to 10 errors in the error queue.
• Read the number of cycles for the displayed relay (relay maintenance feature).

Store and recall instrument states.
• Store up to five instrument states in non-volatile memory.
• Assign a name to each storage location.
• Recall stored states, power-down state, factory reset state, or preset state.

Configure the remote interface.
• Select the GPIB address.
• Configure the RS-232 interface (baud rate, parity, and flow control).

50

Chapter 3 Front-Panel Overview
To Unsecure for Calibration

To Unsecure for Calibration
You can unsecure the instrument either from the front panel or over the
remote interface. The instrument is secured when shipped from the
factory and the security code is set to “HP034970”.
• Once you enter a security code, that code must be used for both
front-panel and remote operation. For example if you secure the
instrument from the front panel, you must use that same code to
unsecure it from the remote interface.
• Press

3

to enter the Utility menu.

When you first enter the Utility menu, the calibration entries toggle
between CAL SECURED and UNSECURE CAL. To unsecure the
instrument, select UNSECURE CAL and press

. After entering the

correct security code, press
again. When you return to the menu,
you will see new choices CAL UNSECURED and SECURE CAL.
Note: If you enter the wrong secure code, NO MATCH is displayed
and a new choice, EXIT, is shown.

To Secure Against Calibration
You can secure the instrument either from the front panel or over the
remote interface. The instrument is secured when shipped from the
factory and the security code is set to “HP034970”.
• Once you enter a security code, that code must be used for both
front-panel and remote operation. For example if you secure the
instrument from the front panel, you must use that same code to
unsecure it from the remote interface.
• Press

to enter the Utility menu.

When you enter the Utility menu, the calibration entries toggle
between CAL UNSECURED and SECURE CAL. To secure the
instrument, select SECURE CAL and press

. After entering the

desired security code, press
again. When you return to the
menu, you will see new choices CAL SECURED and UNSECURE CAL.

51

Chapter 3 Front-Panel Overview
To Change the Security Code

To Change the Security Code
• To change the security code, you must first unsecure the instrument,
and then enter a new code. Make sure you have read the security
code rules described on page 67 before attempting to change the
security code.
• To change the security code, first make sure that the instrument is
unsecured. Go to the SECURE CAL entry, enter the new security code,
and press
(the instrument is now secured with the new code).
Changing the code from the front panel also changes the code as seen
from the remote interface.

Error Messages
Error messages are retrieved in a first-in first-out (FIFO) order.
When the ERROR annunciator is on, press
to view error
messages. Use the arrow keys to scroll the message in the display.
A list of the self-test errors messages and their meanings begin on
page 168.
For a complete list of error messages and descriptions, see chapter 6 in
the 34970A User’s Guide.

52

Chapter 3 Front-Panel Overview
To Perform a Zero Adjustment

To Perform a Zero Adjustment
The instrument features closed case electronic calibration. No internal
mechanical adjustments are required. The instrument calculates
correction factors based upon an input reference value and stores the
correction factors in non-volatile memory. This procedure demonstrates
making the zero adjustment from the front panel. The gain adjustments
are similar.
DO NOT perform this procedure before reading Chapter 4. Chapter 4
describes this procedure, the required input connections, input signals,
and test considerations required for a valid adjustment.
1 Configure the channel.
You must configure a channel before applying performing the
adjustment procedure. Configure the channel to DC VOLTS
and 61⁄2 digits.
2 Apply the input signal
In this example, the input signal is a copper short (see page 66).
3 Setup the calibration.
The display will show PERFORM CAL..
4 Set the adjustment value.
The display will show the a number. Edit the number to the actual
input value. For the Zero Adjustment, the input value is 0.000000.
+000.000,000 mVDC

5 Begin the adjustment.
The display will show the progress of the adjustment. When all the
adjustments are completed, the display will show done.
DONE

53

3

Chapter 3 Front-Panel Overview
To Apply Mx+B Scaling to Measurements

To Apply Mx+B Scaling to Measurements
The scaling function allows you to apply a gain and offset to all readings
on a specified multiplexer channel during a scan. In addition to setting
the gain (“M”) and offset (“B”) values, you can also specify a custom
measurement label for your scaled readings (RPM, PSI, etc.).
1 Configure the channel.
You must configure the channel (function, transducer type, etc.) before
applying any scaling values. If you change the measurement
configuration, scaling is turned off on that channel and the gain and
offset values are reset (M=1 and B=0).
2 Set the gain and offset values.
The scaling values are stored in non-volatile memory for the specified
channels. A Factory Reset turns off scaling and clears the scaling values
on all channels. An Instrument Preset or Card Reset does not clear the
scaling values and does not turn off scaling.

Set Gain

+1.000,000

-0.700,000

OHM

Set Offset

3 Select the custom label.
You can specify an optional three-character label for your scaled
readings (RPM, PSI, etc.). The default label is the standard engineering
unit for the selected function (VDC, OHM, etc.).
LABEL AS OHM

4 Scaling is now applied to the measurements.

54

Chapter 3 Front-Panel Overview
To Read the Relay Cycle Count

To Read the Relay Cycle Count
The instrument has a Relay Maintenance System to help you predict
relay end-of-life. The instrument counts the cycles on each relay in the
instrument and stores the total count in non-volatile memory on each
switch module. You can use this feature on any of the relay modules and
the internal DMM.
• In addition to the channel relays, you can also query the count on
backplane relays and bank relays. Note that you cannot control the
state of these relays from the front panel but you can query the count.
• You can also query the state of the three relays on the internal DMM.
These relays are numbered “1”, “2”, and “3” (which correspond to
relays K102, K103, and K104 respectively). These relays open or close
when a function or range is changed on a module.
• The 34908A multiplexer contains 40 channels which are switched
(HI only) using only 20 relays. Each relay is used to switch HI on two
different channels (and only one channel can be closed at a time).
The channels are arranged such that channels 01 and 21 use different
contacts on the same relay. The remaining channels are also paired in
the same manner (channels 02 and 22, channels 03 and 23, etc.).
Therefore, when you query the relay count on a channel, the number
reflects the number of times that the relay was closed. For example,
the relay count will always be the same on channels 01 and 21.
• For more information on relay life and load considerations, refer to
“Relay Life and Preventative Maintenance” in the 34970A User’s Guide.
• To read the count on the active channel, choose the following item
and then turn the knob. To read the count on the internal DMM
relays, turn the knob counterclockwise beyond the lowest numbered
channel in the instrument. To read the “hidden” relays, turn the knob
clockwise beyond the highest numbered channel in the current slot.

RELAY CYCLES

55

3

Chapter 3 Front-Panel Overview
To Read a Digital Input Port

To Read a Digital Input Port
The multifunction module (34907A) has two non-isolated 8-bit
input/output ports which you can use for reading digital patterns.
You can read the live status of the bits on the port or you can configure
a scan to include a digital read.
1 Select the Digital Input port.
Select the slot containing the multifunction module and continue
turning the knob until DIN is displayed (channel 01 or 02).
2 Read the specified port.
You can specify whether you want to use binary or decimal format.
Once you have selected the number base, it is used for all input or
output operations on the same port. To change the number base,
press the
key and select USE BINARY or USE DECIMAL.
01010101 DIN
Bit 7

Binary Display Shown

Bit 0

The bit pattern read from the port will be displayed until you press
another key, turn the knob, or until the display times out.
Note: To add a digital input channel to a scan list, press
the DIO READ choice.

56

and select

Chapter 3 Front-Panel Overview
To Write to a Digital Output Port

To Write to a Digital Output Port
The multifunction module (34907A) has two non-isolated 8-bit
input/output ports which you can use for outputting digital patterns.
1 Select the Digital Output port.
Select the slot containing the multifunction module and continue
turning the knob until DIN is displayed (channel 01 or 02).

3

2 Enter the bit pattern editor.
Notice that the port is now converted to an output port (DOUT).
00000000 DOUT
Bit 7

Binary Display Shown

Bit 0

3 Edit the bit pattern.
Use the knob and
or
keys to edit the individual bit values.
You can specify whether you want to use binary or decimal format.
Once you have selected the number base, it is used for all input or
output operations on the same port. To change the number base,
press the
key and select USE BINARY or USE DECIMAL.
240 DOUT

Decimal Display Shown

4 Output the bit pattern to the specified port.
The specified bit pattern is latched on the specified port. To cancel an
output operation in progress, wait for the display to time out.

57

Chapter 3 Front-Panel Overview
To Read the Totalizer Count

To Read the Totalizer Count
The multifunction module (34907A) has a 26-bit totalizer which can
count TTL pulses at a 100 kHz rate. You can manually read the totalizer
count or you can configure a scan to read the count.
1 Select the totalizer channel.
Select the slot containing the multifunction module and continue
turning the knob until TOTALIZE (channel 03) is displayed.
2 Configure the totalize mode.
The internal count starts as soon as you turn on the instrument.
You can configure the totalizer to reset the count to “0” after being read
or it can count continuously and be manually reset.
READ + RESET

3 Read the count.
The count is read once each time you press
; the count does not
update automatically on the display. As configured in this example,
the count is automatically reset to “0” each time you read it.
12345 TOT

The count will be displayed until you press another key, turn the knob,
or until the display times out. To manually reset the totalizer count,
press
.
Note: To add a totalizer channel to a scan list, press

TOT READ choice.

58

and select the

Chapter 3 Front-Panel Overview
To Output a DC Voltage

To Output a DC Voltage
The multifunction module (34907A) has two analog outputs capable of
outputting calibrated voltages between ±12 volts.
1 Select a DAC Output channel.
Select the slot containing the multifunction module and continue
turning the knob until DAC is displayed (channel 04 or 05).

3

2 Enter the output voltage editor.
+00.000 V DAC

3 Set the desired output voltage.
Use the knob and

or

keys to edit the individual digits.

+05.250 V DAC

4 Output the voltage from the selected DAC .
The output voltage will be displayed until you press another key or turn
the knob. To manually reset the output voltage to 0 volts, press
.

59

60

4

4

Calibration Procedures

Calibration Procedures
This chapter contains procedures for verification of the instrument’s
performance and adjustment (calibration). These procedures are
required only if the internal DMM is installed. The chapter is divided
into the following sections:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

Keysight Technologies Calibration Services, on page 63
Calibration Interval, on page 63
Time Required for Calibration, on page 64
Automating Calibration Procedures, on page 64
Recommended Test Equipment, on page 65
Input connections, on page 66
Calibration Security, on page 67
Calibration Message, on page 69
Calibration Count, on page 69
Calibration Procedures, on page 70
Aborting a Calibration in Progress, on page 70
Test Considerations, on page 71
Performance Verification Tests, on page 72
Internal DMM Verification Tests, on page 75
Optional AC Performance Verification Tests, on page 80
Internal DMM Adjustments, on page 81
–10 Vdc Adjustment Procedure (Optional), on page 85
Plug-in Module Test Considerations, on page 87
Relay Verification, on page 88
Thermocouple Reference Junction (Optional), on page 112
34907A Analog Output, on page 114

Closed-Case Electronic Calibration The instrument features
closed-case electronic calibration. No internal mechanical
adjustments are required. The instrument calculates correction
factors based upon the input reference value you set. The new
correction factors are stored in non-volatile memory until the next
calibration adjustment is performed. Non-volatile EEPROM
calibration memory does not change when power has been off or
after a remote interface reset.

62

Chapter 4 Calibration Procedures
Keysight Technologies Calibration Services

Keysight Technologies Calibration Services
When your instrument is due for calibration, contact your local
Keysight Service Center for a low-cost recalibration. The 34970A is
supported on automated calibration systems which allow Keysight to
provide this service at competitive prices.

Calibration Interval
The instrument should be calibrated on a regular interval determined
by the measurement accuracy requirements of your application.
A 1-year interval is adequate for most applications. Accuracy
specifications are warranted only if adjustment is made at regular
calibration intervals. Accuracy specifications are not warranted
beyond the 1-year calibration interval. Keysight does not recommend
extending calibration intervals beyond 2 years for any application.

4

Adjustment is Recommended
Whatever calibration interval you select, Keysight recommends that
complete re-adjustment should always be performed at the calibration
interval. This will assure that the 34970A will remain within
specification for the next calibration interval. This criteria for
re-adjustment provides the best long-term stability. Performance data
measured using this method can be used to extend future calibration
intervals.
Use the Calibration Count feature (see page 69) to verify that all
adjustments have been performed.

63

Chapter 4 Calibration Procedures
Time Required for Calibration

Time Required for Calibration
The 34970A can be automatically calibrated under computer control.
With computer control you can perform the complete calibration
procedure and performance verification tests in less than 30 minutes
once the instrument is warmed-up (see “Test Considerations” on page 71).
Manual calibrations using the recommended test equipment will take
approximately 2 hours.

Automating Calibration Procedures
You can automate the complete verification and adjustment
procedures outlined in this chapter if you have access to
programmable test equipment. You can program the instrument
configurations specified for each test over the remote interface.
You can then enter readback verification data into a test program
and compare the results to the appropriate test limit values.
You can also adjust the instrument from the remote interface.
Remote adjustment is similar to the local front-panel procedure.
You can use a computer to perform the adjustment by first selecting
the required function and range. The calibration value is sent to the
instrument and then the calibration is initiated over the remote
interface. The instrument must be unsecured prior to initiating
the calibration procedure.
For further information on programming the instrument,
see chapter 5 in the 34970A User’s Guide.

64

Chapter 4 Calibration Procedures
Recommended Test Equipment

Recommended Test Equipment
The test equipment recommended for the performance verification
and adjustment procedures is listed below. If the exact instrument is
not available, substitute calibration standards of equivalent accuracy.
A suggested alternate method would be to use the Keysight 458A 81⁄2digit Digital Multimeter to measure less accurate yet stable sources.
The output value measured from the source can be entered into the
instrument as the target calibration value.
Application
[1]

Recommended Equipment

Zero Calibration

None

DC Voltage[1]
DC Current [1]

Fluke 5700A

Accuracy Requirements

Fluke 5700A/ 5725A

4 -terminal all copper short
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec

Resistance

Fluke 5700A

<1/5 instrument 24 hour spec

AC Voltage[1]

Fluke 5700A/ 5725A

AC Current[1]
Frequency[1]

Fluke 5700A/ 5725A
Keysight 33220A

<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec

Analog Output
34907A

Keysight 34401A

<1/5 instrument 24 hour spec

Thermocouple
Reference Junction
34901A
34902A
34908A

Thermistor YSI 44031 (two) [2]

± 0.1 °C

Relay contact resistance
All switch modules

Keysight 34401A

[1]

4

J Type Calibrated Thermocouple
Triple Point Cell
± 0.001Ω resolution

[1] In addition to the internal DMM, these applications require an input multiplexer module.
The 34901A is recommended.
[2] Thermistor YSI 44031 is available as Keysight part number 34308A (package of five).

65

Chapter 4 Calibration Procedures
Input Connections

Input Connections
You will need an input multiplexer module to verify or adjust the
internal DMM. Input connections can be made using a 34901A
20-Channel Multiplexer.
To use a 34901A to completely verify and adjust the internal DMM,
make the following connections:
Connections for
DC/AC Current

Connections for
4-wire Ohms

Connections for DC V, AC V,
2- and 4-wire Ohms

Copper Short

34901A

To
Calibrator

Note: Use shielded twisted pair PTFE â insulated cables to reduce settling
and noise errors. Connect the shield to the source LO output.
You can also use a 34902A for test and adjustment of voltage,
frequency, and resistance functions. You cannot test or adjust current
inputs with a 34902A. If you use a 34902A; connect the copper shorts
to Channels 7 and 15 and make the input connections to
Channels 8 and 16.

66

Chapter 4 Calibration Procedures
Calibration Security

Calibration Security
This feature allows you to enter a security code to prevent accidental
or unauthorized adjustments of the instrument. When you first
receive your instrument, it is secured. Before you can adjust the
instrument, you must unsecure it by entering the correct security code.
See page 51 in Chapter 3 for a procedure to enter the security code.
• The security code is set to “HP034970” when the instrument is
shipped from the factory. The security code is stored in
non-volatile memory, and does not change when power has been
off, after a Factory Reset (*RST command), or after an Instrument
Preset (SYSTem:PRESet command).
• The security code may contain up to 12 alphanumeric characters.
The first character must be a letter, but the remaining characters
can be letters, numbers, or an underscore ( _ ). You do not have to use
all 12 characters but the first character must always be a letter.

4

Note: If you forget your security code, you can disable the security
feature by adding a jumper inside the instrument as described on the
following page.

67

Chapter 4 Calibration Procedures
Calibration Security

To Unsecure the Instrument Without the Security Code
To unsecure the instrument without the correct security code, follow
the steps below. A front panel procedure to unsecure the instrument
is given on page 51. See “Electrostatic Discharge (ESD) Precautions”
on page 162 before beginning this procedure.
Warning

Warning
• Exposed Mains
• Do Not Touch!

SHOCK HAZARD. Only service-trained personnel who are aware
of the hazards involved should remove the instrument covers.
The procedures in this section require that you connect the power
cord to the instrument with the covers removed. To avoid
electrical shock and personal injury, be careful not to touch the
power-line connections.

1

Disconnect the power cord and all input connections.

2

Remove the instrument cover (see page 174). Turn the instrument over.

3

Apply power and turn on the instrument.
Be careful not to touch the power line connections.

4

Apply a short between the two exposed metal pads marked
CAL UNLOCK as shown in the figure below.

Apply Short

5

While maintaining the short, enter any unsecure code.
The instrument is now unsecured.

6

Remove the short.

7

Turn off the instrument and remove the power cord. Reassemble the
instrument.
Now you can enter a new security code. Be sure to remember the new
security code.

68

Chapter 4 Calibration Procedures
Calibration Message

Calibration Message
The instrument allows you to store one message in calibration
memory. For example, you can store such information as the date
when the last calibration was performed, the date when the next
calibration is due, the instrument’s serial number, or even the name
and phone number of the person to contact for a new calibration.
• You can record a calibration message only from the remote
interface and only when the instrument is unsecured. You can
read the message from either the front-panel or over the remote
interface. You can read the calibration message whether the
instrument is secured or unsecured.
• The calibration message may contain up to 40 characters. From
the front panel, you can view 13 characters of the message at a time.
Press
to scroll through the text of the message. Press
again to increase the scrolling speed.

4

Calibration Count
You can query the instrument to determine how many calibrations
have been performed. Note that your instrument was calibrated
before it left the factory. When you receive your instrument, be sure
to read the count to determine its initial value.
• The calibration count increments up to a maximum of 65,535 after
which it rolls over to “0”. Since the value increments by one for
each calibration point, a complete calibration may increase the
value by many counts.
• The calibration count is also incremented with calibrations of the
DAC channels on the multifunction module.
• Front-Panel Operation:
CAL COUNT
• Remote Interface Operation:
CALibration:COUNt?

69

Chapter 4 Calibration Procedures
Calibration Procedure

Calibration Procedure
The following procedure is the recommended method to complete an
instrument calibration.
1

Read “Test Considerations” (page 71).

2

Unsecure the instrument for calibration (page 51).

3

Perform the verification tests to characterize the instrument
(incoming data).

4

Perform the zero adjustment procedures.

5

Perform the gain adjustment procedures. Perform the verification
tests to verify the adjustments (outgoing data).

6

Secure the instrument against calibration.

7

Note the new security code and calibration count in the
instrument’s maintenance records.

Aborting a Calibration in Progress
Sometimes it may be necessary to abort a calibration after the
procedure has already been initiated. You can abort a calibration at
any time by turning off the power. When performing a calibration
from the remote interface, you can abort a calibration by issuing a
remote interface device clear message.
CAUTION

If you abort a calibration in progress when the instrument is attempting
to write new calibration constants to EEPROM, you may lose all
calibration constants for the function. Typically, upon re-applying
power, the instrument will report error 705 Cal:Aborted. You may
also generate errors 740 through 746. If this occurs, you should not use
the instrument until a complete re-adjustment has been performed.

70

Chapter 4 Calibration Procedures
Test Considerations

Test Considerations
To ensure proper instrument operation, verify that you have selected
the correct power line voltage prior to attempting any procedure in
this chapter. See “If the Instrument Does Not Turn On”, on page 42.
Errors may be induced by ac signals present on the input leads
during a self-test. Long test leads can also act as an antenna causing
pick-up of ac signals.
For optimum performance, all procedures should comply with the
following recommendations:
• Assure that the calibration ambient temperature is stable and
between 18 °C and 28 °C. Ideally the calibration should be
performed at 23 °C ±1 °C.
• Assure ambient relative humidity is less than 80%.

4

• Allow a 2-hour warm-up period with a copper short connected and
the multiplexer module installed before verification or adjustment.
The connections are shown in the figure on page 66.
• Use shielded twisted pair PTFE insulated cables to reduce
settling and noise errors. Keep the input cables as short as possible.
• Connect the input cable shield to the source LO output.
Except where noted in the procedures, connect the calibrator LO
source to earth ground.
Two-wire Ohms measurements are affected by the entire path length,
including the plug-in card trace length and slot trace lengths. On the
34901A, Channel 10 is recommended as the median path length
(on the 34902A, use Channel 8) for 2-wire Ohms verification and
adjustments. Install the input multiplexer in slot 200.
Because the instrument is capable of making highly accurate
measurements, you must take special care to ensure that the
calibration standards and test procedures used do not introduce
additional errors. Ideally, the standards used to verify and adjust the
instrument should be an order of magnitude more accurate than each
instrument range full scale error specification.
For the dc voltage, dc current, and resistance gain verification
measurements, you should take care to ensure the calibrator’s “0"
output is correct. If necessary, the measurements can be referenced to
the calibrator’s ”0" output using Mx + B scaling (see page 54). You will
need to set the offset for each range of the measuring function being verified.

71

Chapter 4 Calibration Procedures
Performance Verification Tests

Performance Verification Tests
Use the Performance verification Tests to verify the measurement
performance of the instrument. The performance verification tests
use the instrument’s specifications listed in chapter 1, “Specifications,”
starting on page 15.
You can perform four different levels of performance verification tests:
• Self-Test A series of internal verification tests that give a high
confidence that the instrument is operational.
• Quick Verification A combination of the internal self-tests and
selected verification tests.
• Performance Verification Tests An extensive set of tests that
are recommended as an acceptance test when you first receive the
instrument or after performing adjustments.
• Optional Verification Tests Tests not performed with every
calibration. Perform these tests to verify additional specifications
or functions of the instrument.

72

Chapter 4 Calibration Procedures
Performance Verification Tests

Self-Test
A brief power-on self-test occurs automatically whenever you turn on
the instrument. This limited test assures that the instrument is capable
of operation and also checks the plug-in cards for basic operation.
To perform a complete self-test hold down the
key as you press
the power switch to turn on the instrument; hold down the
key
for more than 5 seconds until the instrument beeps (a complete
description of these tests can be found in chapter 6). The instrument
will automatically perform the complete self-test procedure when you
release the key. The self-test will complete in approximately 20 seconds.
• If the self-test is successful, “PASS” is displayed on the front panel.
• If the self-test fails, “FAIL” is displayed and the ERROR
annunciator turns on. If repair is required, see chapter 6,
“Service,” for further details.

4

• If all tests pass, you have a high confidence (~90%) that the
instrument is operational.

73

Chapter 4 Calibration Procedures
Performance Verification Tests

Quick Performance Check
The quick performance check is a combination of internal self-test
and an abbreviated performance test (specified by the letter Q in the
performance verification tests). This test provides a simple method to
achieve high confidence in the instrument’s ability to functionally
operate and meet specifications. These tests represent the absolute
minimum set of performance checks recommended following any
service activity. Auditing the instrument’s performance for the quick
check points (designated by a Q) verifies performance for “normal”
accuracy drift mechanisms. This test does not check for abnormal
component failures.
To perform the quick performance check, do the following:
• Perform a complete self-test. A procedure is given on page 73.
• Perform only the performance verification tests indicated with the
letter Q .
If the instrument fails the quick performance check, adjustment or
repair is required.

Performance Verification Tests
The performance verification tests are recommended as acceptance
tests when you first receive the instrument. The acceptance test
results should be compared against the 90 day test limits. You should
use the 24-hour test limits only for verification within 24 hours after
performing the adjustment procedure. After acceptance, you should
repeat the performance verification tests at every calibration interval.
If the instrument fails performance verification, adjustment or repair
is required.
Adjustment is recommended at every calibration interval. If adjustment
is not made, you must guard band, using no more than 80% of the
specifications listed in Chapter 1, as the verification limits.

74

Chapter 4 Calibration Procedures
Internal DMM Verification Tests

Internal DMM Verification Tests
These procedures use inputs connected to a 34901A 20-Channel
Multiplexer (see page 66) installed in slot 200.

Zero Offset Verification
This procedure is used to check the zero offset performance of the
internal DMM. Verification checks are only performed for those
functions and ranges with unique offset calibration constants.
Measurements are checked for each function and range as described
in the procedure below.
Zero Offset Verification Procedure
1

Make sure you have read “Test Considerations” on page 71.

2

This procedure will measure the shorts installed on Channels 209
and 219. Leave the Amps input connections (Channel 221) open.

4

Continued on next page...

75

Chapter 4 Calibration Procedures
Internal DMM Verification Tests

Continued from previous page...
1

Select each function and range in the order shown in the table below.
Before executing each test, you must press
to enable reading
monitoring on the selected channel (or use the ROUTe:MON command
from the remote interface). Compare measurement results to the
appropriate test limits shown in the table (see page 74).

Input
Open
Open
Open
Input

Channel 221
Function[1]
Range
DC Current

10 mA
100 mA
1A

Channel 209
Range
Function[1]

Short
Short
Short
Short
Short

DC Volts

Short
Short
Short
Short
Short
Short
Short

2-Wire Ohms [2]
and
4-Wire Ohms

100 mV
1V
10 V
100 V
300 V
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ

Quick
Check

Error from Nominal
24 hour 90 day 1 year
1 µA
4 µA
± 60 µA
±

Q

±

Quick
Check

Q

2 µA
5 µA
± 100 µA
±
±

Error from Nominal
24 hour 90 day 1 year
± 3.5 µV
6 µV
± 40 µV
± 600 µV
± 6 mV
± 3.5 mΩ
± 6 mΩ
± 50 mΩ
± 500 mΩ
± 10 Ω
± 100 Ω
± 10 kΩ
±

Q

± 2 µA
5 µA
± 100 µA
±

±

4 µV
7 µV
± 50 µV
± 600 µV
± 9 mV

±

±

±

4 mΩ
10 mΩ
± 100 mΩ
±1Ω
± 10 Ω
± 100 Ω
± 10 kΩ

4 mΩ
10 mΩ
± 100 mΩ
±1Ω
± 10 Ω
± 100 Ω
± 10 kΩ

±
±

4 µV
7 µV
± 50 µV
± 600 µV
± 9 mV
±
±

[1] Select 61⁄2 digit resolution.
[2] For 2-wire ohms, an additional 4Ω of error must be added.
Q: Quick performance verification test points.

Note: Zero offset calibration using a multifunction calibrator is
NOT recommended. The calibrator and cabling offset can be large
and unstable causing poor offset calibration of the internal DMM.

76

Chapter 4 Calibration Procedures
Internal DMM Verification Tests

Gain Verification
This procedure is used to check the “full scale” reading accuracy of
the internal DMM. Verification checks are performed only for those
functions and ranges with unique gain calibration constants.
Begin verification by selecting a measuring function and range.
Make sure you have read “Test Considerations” on page 71.
DC VOLTS, Resistance, and DC CURRENT Gain Verification Test
1

Make sure you have read “Test Considerations” on page 71.

2

Select each function and range in the order shown below.
Before executing each test, you must press
to enable reading
monitoring on the selected channel (or use the ROUTe:MON command
from the remote interface).

3

Compare measurement results to the appropriate test limits shown
in the table. (Be certain to allow for appropriate source settling.)

Input
100 mV
1V
10 V
100 V
300 V
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ [3]
Input
10 mA
100 mA
1A

Channel 210
Quick
Function[1]
Range Check
DC Volts
100 mV
1V
Q
10 V
100 V
Q
300 V
2-Wire Ohms[2]
and
4-Wire Ohms

100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ

Q

Q

Channel 221
Quick
Function[1]
Range Check
DC Current
10 mA
100 mA
Q
1A

4

Error from Nominal
24 hour 90 day 1 year
± 6.5 µV
± 8 µV
± 9 µV
± 26 µV
± 37 µV
± 47 µV
± 190 µV
± 250 µV
± 400 µV
± 2.6 mV
± 4.1 mV
± 5.1 mV
± 12 mV
±
± 22.5 mV
19.5 mV
± 6.5 mΩ
± 12 mΩ
± 14 mΩ
± 26 mΩ
± 90 mΩ
± 110 mΩ
± 250 mΩ
± 900 mΩ
± 1.1 Ω
± 2.5 Ω
±9Ω
± 11 Ω
± 30 Ω
± 90 Ω
± 110 Ω
± 1.6 kΩ
± 2.1 kΩ
± 4.1 kΩ
± 310 kΩ
± 801 kΩ
± 810 kΩ
Error from Nominal
24 hour 90 day 1 year
± 1.5 µA
± 5 µA
± 7 µA
± 14 µA
± 35 µA
± 55 µA
± 560 µA
± 900 µA
± 1.1 mA

[1] Select 61⁄2 digit resolution.
[2] The 2-wire ohms resistance verification test is optional (see note on Page 82). For 2-wire
ohms, an additional 1Ω of error must be added (see Page 71). Add a 1-second channel delay
when using Fluke 5700 in 2-wire compensated mode. This avoids response time issues with
2-wire compensation when 34970A’s current source contains a pulse.
[3] Verify only, no adjustment required.
Q: Quick performance verification test points.

77

Chapter 4 Calibration Procedures
Internal DMM Verification Tests

AC VOLTS Gain Verification Test
Configuration:

AC Volts
LF 3 HZ:SLOW (in the Advanced menu)

1

Make sure you have read “Test Considerations” on page 71.

2

Select Channel 210, set the AC VOLTS function and the 3 Hz input
filter. With the slow filter selected, each measurement takes 7 seconds
to complete. Before executing each test, you must press
to
enable reading monitoring on the selected channel (or use the
ROUTe:MON command from the remote interface).

3

Select each range in the order shown below. Compare measurement
results to the appropriate test limits shown in the table. (Be certain to
allow for appropriate source settling.)

V rms

Input
Frequency

100 mV
100 mV
1V
1V
10 V
10 V
10 V
10 mV[1]
100 V
100 V
300 V
300 V[2]

1 kHz
50 kHz
1 kHz
50 kHz
1 kHz
50 kHz
10 Hz
1 kHz
1 kHz
50 kHz
1 kHz
50 kHz

Range

Quick
Check

100 mV
Q
1
10 V
Q
100 mV
100 V
300 V

Q

Error from Nominal
24 hour
90 day
1 year
70 µV
150 µV
± 700 µV
± 1.5 mV
± 7 mV
± 15 mV
± 7 mV
± 34 µV
± 70 mV
± 150 mV
± 270 mV
± 600 mV

90 µV
160 µV
± 900 µV
± 1.6 mV
± 9 mV
± 16 mV
± 9 mV
± 45 µV
± 90 mV
± 160 mV
± 390 mV
± 690 mV
±

±

±

±

±

[1] For this test, isolate the calibrator’s output from earth ground.
[2] Some calibrators may have difficulty driving the internal DMM and cable load at this
V-Hz output. Use short, low capacitance cable to reduce calibration loading.
Verification can be performed at >195 Vrms. New test limits can be computed from
the accuracy specification shown in Chapter 1 for the actual test conditions used.
Q: Quick performance verification test points.

Note: The 50 kHz ac voltage test points may fail performance
verification if the internal shields have been removed and reinstalled.
See “Gain Adjustment,” on page 82, for further information on how to
recalibrate the ac voltage function.

78

100 µV
170 µV
± 1 mV
± 1.7 mV
± 10 mV
± 17 mV
± 10 mV
± 46 µV
± 100 mV
± 170 mV
± 420 mV
± 720 mV

±

Chapter 4 Calibration Procedures
Internal DMM Verification Tests

AC CURRENT Gain Verification Test
Configuration:

AC Current
LF 3 HZ:SLOW (in the Advanced menu)

1

Make sure you have read “Test Considerations” on page 71.

2

Select Channel 221, set the AC CURRENT function and the 3 Hz
input filter. With the slow filter selected, each measurement takes
7 seconds to complete. Before executing each test, you must press
to enable reading monitoring on the selected channel (or use the
ROUTe:MON command from the remote interface).

3

Select each range in the order shown below. Compare measurement
results to the appropriate test limits shown in the table. (Be certain
to allow for appropriate source settling.)
Input
Current
Frequency
10 mA [1]
1 kHz
1 kHz
100 mA [1]
1 kHz
10 mA
1 kHz
1A [1]

Range
10 mA
100 mA
1A
1A

Quick
check
Q

Error from Nominal
24 hour
90 day
1 year
± 14 µA
± 600 µA
± 1.41 mA
± 1.4 mA

± 14 µA
± 600 µA
± 1.41 mA
± 1.4 mA

± 14 µA
± 600 µA
± 1.41 mA
± 1.4 mA

[1] Verify only, no adjustment.

Frequency Gain Verification Test
Configuration:

Frequency
61⁄2 digits

1

Make sure you have read “Test Considerations” on page 71.

2

Select Channel 210, select the FREQUENCY function and set 61⁄2 digits.

3

Select each range in the order shown below. Compare measurement
results to the appropriate test limits shown in the table. (Be certain to
allow for appropriate source settling.)
Voltage
10 mV [1]
1V

Input
Frequency
100 Hz
100 kHz

Range
100 mV
1V

Quick
Check

Error from Nominal
24 hour
90 day
1 year
±

Q

±

0.06 Hz
6 Hz

±
±

0 .1 Hz
10 Hz

±
±

0 .1 Hz
10 Hz

[1] Verify only, No adjustment. For this test, isolate the calibrator’s output from earth ground.
Q: Quick performance verification test points.

79

4

Chapter 4 Calibration Procedures
Optional AC Performance Verification Tests

Optional AC Performance Verification Tests
These tests are not intended to be performed with every calibration.
They are provided as an aid for verifying additional instrument
specifications. There are no adjustments for these tests; they are
provided for performance verification only.
Configuration:

AC VOLTS
LF 3 HZ:SLOW (in the Advanced menu)

1

Make sure you have read “Test Considerations” on page 71.

2

Select Channel 210, select the AC Volts function and the 3 HZ filter.
Before executing each test, you must press
to enable reading
monitoring on the selected channel (or use the ROUTe:MON command
from the remote interface).

3

Select each range in the order shown below. Compare measurement
results to the appropriate test limits shown in the table. (Be certain to
allow for appropriate source settling.)
Input
Frequency

Range

1V
1V
1V
1V

20 Hz
20 kHz
100 kHz
300 kHz

1V
1V
1V
1V

±

700 µV
700 µV
± 6.3 mV
± 45 mV

±

900 µV
900 µV
± 6.8 mV
± 45 mV

±

±

±

±

10 V
1V
100 mV

1 kHz
1 kHz
1 kHz

10 V
10 V
10 V

±

7 mV
3.4 mV
± 13 mV

±

9 mV
4.5 mV
± 14 mV

±

±

±

±

Voltage

80

Error from Nominal
24 hour
90 day
1 year
1 mV
1 mV
± 6.8 mV
± 45 mV
10 mV
4.6 mV
± 14 mV

Chapter 4 Calibration Procedures
Internal DMM Adjustments

Internal DMM Adjustments
You will need a 34901A 20-Channel Multiplexer to perform the
following procedures (see page 66). Install the Multiplexer in slot 200.

Zero Adjustment
Each time you perform a zero adjustment, the Internal DMM stores a
new set of offset correction constants for every measurement function
and range. The Internal DMM will sequence through all required
functions and ranges automatically and store new zero offset calibration
constants. All offset corrections are determined automatically. You may
not correct a single range or function without re-entering ALL zero
offset correction constants automatically. This feature is intended to
save calibration time and improve zero calibration consistency.

4

Note: Never turn off the Internal DMM during Zero Adjustment.
This may cause ALL calibration memory to be lost.
Zero Adjustment Procedure
The zero adjustment procedure takes about 5 minutes to complete.
Be sure to allow the instrument to warm up for 2 hours before
performing the adjustments.
Follow the steps outlined below. Review “Test Considerations” on
page 71 before beginning this test. Also see page 53, for an example
of how to initiate a zero calibration.
1

This procedure will use the copper shorts installed on Channels 209
and 219. Leave the Amps input connections (Channel 221) open.

2

Select Channel 209. Select the DC VOLTS function.

3

Press
to enter the calibration menu. Press
begin the adjustment procedure.

4

Use the knob and arrow keys to set the number in the display
to 0.000000 and press
.

5

Perform the Zero Offset Verification tests (see page 75) to check zero
calibration results.

again to

81

Chapter 4 Calibration Procedures
Internal DMM Adjustments

Gain Adjustment
The Internal DMM stores a single new gain correction constant each
time this procedure is followed. The gain constant is computed from
the calibration value entered for the calibration command and from
measurements made automatically during the adjustment procedure.
Most measuring functions and ranges have gain adjustment
procedures. Only the 100 MΩ range does not have gain calibration
procedures. The gain calibration value may be entered through the
front panel menu or over the remote interface. See page 53, for an
example of how to enter calibration values.
Adjustments for each function should be performed ONLY in the
order shown in the performance verification table. See “Performance
Verification Tests” earlier in this chapter for the tables used for gain
adjustments.
Gain Adjustment Considerations
• The zero adjustment procedure must have been recently performed
prior to beginning any gain adjustment procedures.
• The optional –10 Vdc adjustment should be performed only after
servicing the Internal DMM’s a-to-d converter or after replacing
network A4U101 or calibration RAM A4U505.
• When performing a 4-wire ohms gain adjustment, a new gain
correction constant is also stored for the corresponding 2-wire
ohms measurement range. If desired, the 2-wire gain can be
adjusted separately after the 4-wire ohms gain calibration is
completed.
• During the ac voltage gain adjustments, some of the dc voltage
gain constants are used. Perform the dc voltage gain calibration
before the ac voltage gain calibration.
Note: Never turn off the instrument during a Gain Adjustment.
This may cause calibration memory for the present function to be lost.

82

Chapter 4 Calibration Procedures
Internal DMM Adjustments

Valid Gain Adjustment Input Values
Gain adjustment can be accomplished using the following input values.

DC VOLTS

100 mV to 100 V
300 V

Valid Calibration Input
Values
0.9 to 1.1 x Full Scale
250 V to 303 V

OHMS, OHMS 4W

100Ω to 10 MΩ

0.9 to 1.1 x Full Scale

DC CURRENT

10 mA to 1 A

0.9 to 1.1 x Full Scale

AC VOLTS [1]

10 mV to 100 V
300 V

0.9 to 1.1 x Full Scale
95 V to 303 V

AC CURRENT

1A

9 mA to 11 mA

Frequency

Any

Any Input > 100 mV rms,
1 kHz – 100 kHz

Function

Range

[1] Valid frequencies are as follows:

4

1 kHz ± 10% for the 1 kHz calibration,
45 kHz – 100 kHz for the 50 kHz calibration,
and 10 Hz ± 10% for the 10 Hz calibration.

83

Chapter 4 Calibration Procedures
Internal DMM Adjustments

Gain Adjustment Procedure
Adjustment for each function should be performed only in the order
shown in the performance verification table. The performance
verification tables used for gain adjustments start on page 77.
Review the “Test Considerations” (page 71) and “Gain Adjustment
Considerations” (page 82) sections before beginning this test.
Configuration:

DC functions — 61⁄2 digits
AC functions — LF 3 HZ:SLOW (in the Advanced menu)

1

Select Channel 210. Configure the channel to each function and
range shown in the gain verification tables (pages 75 – 79).

2

Apply the input signal shown in the “Input” column of the
appropriate verification table.
Note: Always complete tests in the same order as shown in the
appropriate verification table.

3

Press
to enter the calibration menu. Press
begin the adjustment procedure.

again to

4

Use the knob,
and
to set the number in the display to the
actual input value and press
.

5

Perform the appropriate Gain Verification Test to check the
calibration results.

6

Repeat steps 1 through 6 for each gain verification test point shown
in the tables.
Note: Each range in the gain adjustment procedure takes less than
20 seconds to complete.

84

Chapter 4 Calibration Procedures
–10 Vdc Adjustment Procedure (Optional)

–10 Vdc Adjustment Procedure (Optional)
The –10 Vdc calibration electronically enhances the Internal DMM’s
a-to-d converter linearity characteristic. This adjustment should
ONLY be performed after servicing the A-to-D converter or
replacement of the calibration RAM.
You will need a 34901A 20-Channel Multiplexer to perform the
following procedures (see page 66). Install the Multiplexer in slot 200.
1

If a zero calibration has not been performed recently, perform one
before beginning this procedure (see page 81).

2

Select Channel 210. Configure the channel as follows:
DC VOLTS
10 V range
61⁄2 digits
INTEG 100 PLC (in the Advanced menu)
INPUT R > 10 G (in the Advanced menu)
Before executing each test, you must press
to enable reading
monitoring on the selected channel (or use the ROUTe:MON command
from the remote interface).

3

Measure and note the voltage offset present at the end of the
measurement cable by shorting the ends of the Channel 210
measurement cable. Be sure to use a copper wire and allow enough
time for the residual thermal offset to stabilize (usually about
1 minute).

4

Connect the input cable to the calibrator output and set the calibrator
to output +10V. Allow enough settling time for any thermal offset
voltages to stabilize (usually about 1 minute).

5

Perform a +10V dc gain calibration. Press
to enter the
calibration menu. Press
again to begin the adjustment procedure.

6

Use the knob,
and
to set the number in the display to the
sum of the calibrator output and the measured offset (from step 3)
and press
. For example, if the calibrator output is 10.001 volts
and the measured offset is 10 µV, enter +10.001010 volts. When the
adjustment finishes, verify that new readings fall within ± 20 µV of
the calibrator output plus the offset.

4

Continued on next page...

85

Chapter 4 Calibration Procedures
–10 Vdc Adjustment Procedure (Optional)

Continued from previous page...
1

Reverse the cable connections to the calibrator to create a -10 Vdc
voltage standard. You must physically reverse the cables.
DO NOT switch the output polarity of the calibrator.

2

Perform a –10V DC gain calibration. Press
to enter the
calibration menu. Press
again to begin the adjustment
procedure. Be sure to allow time for thermal offsets to stabilize
(usually about 1 minute).

3

Use the knob
and
to set the number in the display to the
difference of the calibrator output and the measured offset (from step 3)
and press
. Using the previous example values, enter 10 µV
minus 10.001 volts or –10.000990 volts.

4

When the adjustment finishes, verify that new readings fall
within ± 30 µV of the calibrator output minus the offset.

86

Chapter 4 Calibration Procedures
Plug-in Module Test Considerations

Module Reference

Plug-in Module Test Considerations
For optimum performance, all test procedures should comply with the
following recommendations:
• Assure that the calibration ambient temperature is stable and
between 18 °C and 28 °C. Ideally the calibration should be
performed at 23 °C ± 1 °C.
• Assure ambient relative humidity is less than 80%.
• Install the plug-in module and allow a 45 minute warm-up period
before verification or adjustment.
• Use shielded twisted pair PTFE insulated cables to reduce settling
and noise errors. Keep the input cables as short as possible.
• Remove all user wiring and connections from the plug-in modules
before verification or adjustment.

4

• Use 4-wire Ohms measurement techniques for checking relay
contact resistance. Check directly at the terminals where possible.

87

Chapter 4 Calibration Procedures
Relay Verification

Relay Verification
There are two methods you can use to verify relays:
• Read the relay cycle count.
• Measure the relay contact resistance.

Relay Cycle Count
The instrument has a Relay Maintenance System to help you predict
relay end-of-life. The instrument counts the cycles on each relay in
the instrument and stores the total count in non-volatile memory on
each switch module. You can use this feature on any of the relay
modules and the internal DMM.
• In addition to the channel relays, you can also query the count on
backplane relays and bank relays. Note that you cannot control the
state of these relays from the front panel but you can query the count.
• You can also query the state of the three relays on the internal DMM.
These relays are numbered “1”, “2”, and “3” (which correspond to
relays K102, K103, and K104 respectively). These relays open or
close when a function or range is changed on a module.
• The 34908A multiplexer contains 40 channels which are switched
(HI only) using only 20 relays. Each relay is used to switch HI on two
different channels (and only one channel can be closed at a time).
The channels are arranged such that channels 01 and 21 use different
contacts on the same relay. The remaining channels are also paired
in the same manner (Channels 02 and 22, Channels 03 and 23, etc.).
Therefore, when you query the relay count on a channel, the number
reflects the number of times that the relay was closed. For example,
the relay count will always be the same on Channels 01 and 21.
• You can reset the count (allowed only from remote) but the
instrument must be unsecured (see “To Unsecure for Calibration”
on page 51 to unsecure the instrument).
• For more information on relay life and load considerations, refer to
“Relay Life and Preventative Maintenance” in Chapter 8 of the
34970A User’s Guide.
• A procedure to read the relay cycle count is given on page 55.

88

Chapter 4 Calibration Procedures
Relay Verification

(Optional)

34901A Relay Contact Resistance Verification

Module Reference

This optional procedure uses an external DMM to make 4-wire ohms
measurements across the relay contacts on the 34901A. The measured
resistance is the series resistance of the two relay contacts (both
contacts are in the same relay).
Note: Be sure to read “Plug-in Module Test Considerations” on page 87.
Tests 1 - 5:

See the diagram on page 90 for the required connections for each test
(be sure to probe the components at the indicated location). For these
measurements, the 34901A is not installed in the 34970A. Record the
4-wire ohms measurements from the external DMM in the table below.
Note: The connections to the external DMM are different for each of
Tests 1, 2, 4, and 5. Be sure to verify the connections shown in the
table below for each of the four tests.

4

External DMM Ohmmeter Connections
Test
#

HI

LO

HI
Sense

LO
Sense

Measured
Value

1

L401

J101, C14

L401

J101, C14

__________ Ohms

2

L402

J101, C15

L402

J101, C15

__________ Ohms

3

Add (Test 1 + Test 2)

__________ Ohms

4

F501

Ch 21 I

F501

Ch 21 I

__________ Ohms

5

F502

Ch 22 I

F502

Ch 22 I

__________ Ohms

89

Chapter 4 Calibration Procedures
Relay Verification

Note: Connect bare copper wires (approximately 3 cm in length)
to the I terminals of Channels 21 and 22 as shown below. These wires
will be used to make shorts across the channels in Tests 6 through 39.

Note: Be sure to probe the components
at the indicated locations on the module.

Probe here
for L402
measurement.

Probe here for F501 measurement.
Probe here for F502 measurement.

Connections for 34901A Verification Tests 1 through 5

90

Chapter 4 Calibration Procedures
Relay Verification

Tests 6 - 8:

Module Reference

Make the connections to the 34901A as shown in the diagram below.
Be sure to route your wiring for proper strain relief and install the
module cover. Install the 34901A in slot 200 of the 34970A. Open all
channels on the module by performing a Factory Reset (press
and select “Recall State”; press
again and select “Factory Reset”).
Configure Channel 20 as follows: DC volts, 10 volt range, and 51⁄2 digits.

4

Channel 20 should be left open.

Connections for 34901A Verification Tests 6 through 39
Enable reading monitoring by pressing
on the selected channel
(or use the ROUTe:MON command). Record the 4-wire ohms
measurements from the external DMM in the following table.
External DMM Ohmmeter Connections
Test
Channel
#
Configured

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

6

Ch 20

P2

P2

P1

P1

__________ Ohms

2.00Ω

K421

7

Ch 20

P2

P2

P3

P3

__________ Ohms

—

—

__________ Ohms

2.00Ω

K422

8

Subtract (Test 7 – Test 6)

91

Chapter 4 Calibration Procedures
Relay Verification

Tests 9 - 10:

Open all channels on the module by performing a Factory Reset.
Configure Channel 10 (module in slot 200) as follows: 4-wire ohms,
1 kΩ range, and 51⁄2 digits.
Enable reading monitoring by pressing
on the selected channel
(or use the ROUTe:MON command). Record the 4-wire ohms
measurements from the external DMM in the following table.
External DMM Ohmmeter Connections

Test
Channel
#
Configured
9

Ch 10

10

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

P2

P2

P3

P3

__________ Ohms

—

—

__________ Ohms

2.00Ω

K423

Subtract (Test 9 – Test 3)

Tests 11- 33:

Open all channels on the module by performing a Factory Reset.
For each test, close only the channel shown in the “Channel Closed”
column below (module in slot 200). Turn the Monitor Mode “off” and
select “Banks Joined” from the Advanced menu. Record the 4-wire
ohms measurements from the external DMM in the following table.
External DMM Ohmmeter Connections

Test
#

Channel
Closed*

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

11

Ch 1

P2

P2

P1

P1

__________ Ohms

2.00Ω

K401

12

Ch 2

P2

P2

P1

P1

__________ Ohms

2.00Ω

K402

13

Ch 3

P2

P2

P1

P1

__________ Ohms

2.00Ω

K403

14

Ch 4

P2

P2

P1

P1

__________ Ohms

2.00Ω

K404

15

Ch 5

P2

P2

P1

P1

__________ Ohms

2.00Ω

K405

16

Ch 6

P2

P2

P1

P1

__________ Ohms

2.00Ω

K406

17

Ch 7

P2

P2

P1

P1

__________ Ohms

2.00Ω

K407

* Only the channel currently under test should be closed at one time. All other channels should be open.

Continued on next page...
92

Chapter 4 Calibration Procedures
Relay Verification

... Continued from previous page

Test
#

Channel
Closed*

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

18

Ch 8

P2

P2

P1

P1

__________ Ohms

2.00Ω

K408

19

Ch 9

P2

P2

P1

P1

__________ Ohms

2.00Ω

K409

20

Ch 10

P2

P2

P1

P1

__________ Ohms

2.00Ω

K410

21

Ch 11

P2

P2

P1

P1

__________ Ohms

2.00Ω

K411

22

Ch 12

P2

P2

P1

P1

__________ Ohms

2.00Ω

K412

23

Ch 13

P2

P2

P1

P1

__________ Ohms

2.00Ω

K413

24

Ch 14

P2

P2

P1

P1

__________ Ohms

2.00Ω

K414

25

Ch 15

P2

P2

P1

P1

__________ Ohms

2.00Ω

K415

26

Ch 16

P2

P2

P1

P1

__________ Ohms

2.00Ω

K416

27

Ch 17

P2

P2

P1

P1

__________ Ohms

2.00Ω

K417

28

Ch 18

P2

P2

P1

P1

__________ Ohms

2.00Ω

K418

29

Ch 19

P2

P2

P1

P1

__________ Ohms

2.00Ω

K419

30

Ch 21

P4

P4

P5

P5

__________ Ohms

—

—

__________ Ohms

2.00Ω

K522

__________ Ohms

—

—

__________ Ohms

2.00Ω

K522

31
32
33

Subtract (Test 30 – Test 4)
Ch 22

P4

P4

P5

Subtract (Test 32 – Test 5)

P5

* Only the channel currently under test should be closed at one time. All other channels should be open.

93

Module Reference

External DMM Ohmmeter Connections

4

Chapter 4 Calibration Procedures
Relay Verification

Tests 34 - 36:

Close only channels Channels 20 and 22. Remove the 34901A from the
34970A and do not reinstall it for these tests.
On connector J101, remove the jumper between pins C14 and C15
(the top jumper shown in the diagram on page 91). On the remaining
jumper connected to J101 (the bottom jumper shown in the diagram),
move the end of the jumper from pin C12 to pin C16; the jumper
should now short pins C13 and C16 together.
Cut, but do not remove, the copper shorts on Channels 21 and 22
(the wires will be used for the 4-wire ohms measurements below).
Add a copper short between the L and H terminals on Channel 20.
Record the measured value as Test 34 in the table below.
Using the external DMM, make a 4-wire ohms measurement between
the L and I terminals on Channel 21. Record the measured value as
Test 35 in the table below.

External DMM Ohmmeter Connections
Test
#

Channel
Closed

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

34

Ch 20*

P3

P3

P2

P2

__________ Ohms

2.00Ω

K420

35

Ch 22*

Ch 21 I

Ch 21 L

Ch 21 I

Ch 21 L

__________ Ohms

—

—

__________ Ohms

2.00Ω

K523

36

Subtract (Test 35 – Test 4)

* The latching relays remain closed when the module is removed from the 34970A.

94

Chapter 4 Calibration Procedures
Relay Verification

Enable reading monitoring by pressing
on the selected channel
(or use the ROUTe:MON command). Record the 4-wire ohms
measurement from the external DMM in the following table.

External DMM Ohmmeter Connections
Test
Channel
#
Configured
37

Ch 21

Tests 38 - 39:

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

P4

P4

P5

P5

__________ Ohms

2.00Ω

K521

Open all channels on the module by performing a Factory Reset.
Close Channel 21 (module in slot 200). Remove the 34901A from the
34970A and do not reinstall it for the remaining tests. Using the
external DMM, make a 4-wire ohms measurement between the L
and I terminals on Channel 22. Record the measured value as Test 38 in
the following table.

4

External DMM Ohmmeter Connections
Test
#

Channel
Closed

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

38

Ch 21

Ch 22 I

Ch 22 L

Ch 22 I

Ch 22 L

__________ Ohms

—

—

__________ Ohms

2.00Ω

K524

39

Subtract (Test 38 – Test 5)

Module Reference

Install the 34901A in slot 200 of the 34970A. Select and configure
Channel 21 as follows: DC current, 1 amp range, and 51⁄2 digits.

Test 37:

95

Chapter 4 Calibration Procedures
Relay Verification

(Optional)

34902A Relay Contact Resistance Verification
This optional procedure uses an external DMM to make 4-wire ohms
measurements across the relay contacts on the 34902A. The measured
resistance is the series resistance of the two relay contacts (both
contacts are in the same relay).
Note: Be sure to read “Plug-in Module Test Considerations” on page 87.

Tests 1 - 4:

See the diagram on page 97 for the required connections for each test
(be sure to probe the components at the indicated location). For these
measurements, the 34902A is not installed in the 34970A. Record the
4-wire ohms measurements from the external DMM in the table below.
Note: The connections to the external DMM are different for each of
Tests 1, 2, and 3. Be sure to verify the connections shown in the table
below for each of the three tests.

External DMM Ohmmeter Connections
Test
#

HI

LO

HI
Sense

LO
Sense

Measured
Value

1

L300

J101, C12

L300

J101, C12

__________ Ohms

2

L301

J101, C14

L301

J101, C14

__________ Ohms

3

L302

J101, C15

L302

J101, C15

__________ Ohms

4

96

Add (Test 2 + Test 3)

__________ Ohms

Chapter 4 Calibration Procedures
Relay Verification

Module Reference

Probe here for
L302 and L301
measurements.

4

Connections for 34902A Verification Tests 1 through 4

97

Chapter 4 Calibration Procedures
Relay Verification

Tests 5 - 8:

Make the connections to the 34902A as shown in the diagram below.
Be sure to route your wiring for proper strain relief and install the
module cover. Install the 34902A in slot 200 of the 34970A. Open all
channels on the module by performing a Factory Reset (press
and select “Recall State”; press
again and select “Factory Reset”).
Configure Channel 16 as follows: DC volts, 10 volt range, and 51⁄2 digits.

Connections for 34902A Verification Tests 5 through 27
Enable reading monitoring by pressing
on the selected channel
(or use the ROUTe:MON command). Record the 4-wire ohms
measurements from the external DMM in the following table.
External DMM Ohmmeter Connections
Test
Channel
#
Configured
5

Ch 16

6
7
8

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

P3

P3

P1

P1

__________ Ohms

—

—

__________ Ohms

2.00Ω

K326

__________ Ohms

—

—

__________ Ohms

2.00Ω

K327

Subtract (Test 5 – Test 1)
Ch 16

P3

P3

P2

Subtract (Test 7 – Test 5)

98

P2

Chapter 4 Calibration Procedures
Relay Verification

Tests 9 - 10:

Enable reading monitoring by pressing
on the selected channel
(or use the ROUTe:MON command). Record the 4-wire ohms
measurements from the external DMM in the following table.

External DMM Ohmmeter Connections
Test
Channel
#
Configured
9

Ch 08

10

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

P3

P3

P2

P2

__________ Ohms

—

—

__________ Ohms

2.00Ω

K328

Subtract (Test 9 – Test 4)

Module Reference

Open all channels on the module by performing a Factory Reset.
Configure Channel 08 (module in slot 200) as follows: 4-wire ohms,
1 kΩ range, and 51⁄2 digits.

4
Tests 11 - 27:

Open all channels on the module by performing a Factory Reset.
For each test, close only the channels shown in the “Channels Closed”
column below (module in slot 200). Turn the Monitor Mode “off” and
select “Banks Joined” from the Advanced menu. Record the 4-wire
ohms measurements from the external DMM in the following table.

External DMM Ohmmeter Connections
Test
#

Channels
Closed*

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

11

Ch 16 & 1

P3

P3

P1

P1

__________ Ohms

2.00Ω

K301

12

Ch 16 & 2

P3

P3

P1

P1

__________ Ohms

2.00Ω

K302

13

Ch 16 & 3

P3

P3

P1

P1

__________ Ohms

2.00Ω

K303

14

Ch 16 & 4

P3

P3

P1

P1

__________ Ohms

2.00Ω

K304

15

Ch 16 & 5

P3

P3

P1

P1

__________ Ohms

2.00Ω

K305

* Only the channels currently under test should be closed at one time. All other channels should be open.

Continued on next page...

99

Chapter 4 Calibration Procedures
Relay Verification

... Continued from previous page

External DMM Ohmmeter Connections
Test
#

Channels
Closed*

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

16

Ch 16 & 6

P3

P3

P1

P1

__________ Ohms

2.00Ω

K306

17

Ch 16 & 7

P3

P3

P1

P1

__________ Ohms

2.00Ω

K307

18

Ch 16 & 8

P3

P3

P1

P1

__________ Ohms

2.00Ω

K308

19

Ch 16 & 9

P3

P3

P1

P1

__________ Ohms

2.00Ω

K309

20

Ch 16 & 10

P3

P3

P1

P1

__________ Ohms

2.00Ω

K310

21

Ch 16 & 11

P3

P3

P1

P1

__________ Ohms

2.00Ω

K311

22

Ch 16 & 12

P3

P3

P1

P1

__________ Ohms

2.00Ω

K312

23

Ch 16 & 13

P3

P3

P1

P1

__________ Ohms

2.00Ω

K313

24

Ch 16 & 14

P3

P3

P1

P1

__________ Ohms

2.00Ω

K314

25

Ch 16 & 15

P3

P3

P1

P1

__________ Ohms

2.00Ω

K315

26

Ch 16 & 15

P3

P3

P4

P4

__________ Ohms

2.00Ω

—

__________ Ohms

2.00Ω

K316

27

Subtract (Test 26 – Test 25)

* Only the channels currently under test should be closed at one time. All other channels should be open.

100

Chapter 4 Calibration Procedures
Relay Verification

(Optional)

34903A Relay Contact Resistance Verification
Be sure to read “Plug-in Module Test Considerations” on page 87.

2

Install the 34903A module in slot 100. Close Channels 01 through 20.
Remove the module from the 34970A.

3

Measure the resistance from the CM terminal to the NO terminal on
each channel.

4

Install the module in slot 100. Open Channel 01 through 20.
Remove the module from the 34970A.

5

Measure the resistance from the CM terminal to the NC terminal on
each channel.

Module Reference

1

Note: In general, a new relay should have a contact resistance of less than
0.2Ω. Relays with contact resistance in excess of 1.2Ω should be replaced.

4

101

Chapter 4 Calibration Procedures
Relay Verification

(Optional)

34904A Relay Contact Resistance Verification
This optional procedure uses an external DMM to make 4-wire ohms
measurements across the relay contacts on the 34904A.
Be sure to read “Plug-in Module Test Considerations” on page 87.
Connect copper shorts from H to L on each of the eight columns (COL1
through COL8) as shown below. Connect the HI, LO, Sense HI, and Sense
LO leads to ROW1 as shown below.
Note: For all steps in the following procedures, after connecting or
moving test leads, route your wiring for proper strain relief and install
the module cover. Install the 34904A in slot 200 of the 34970A.

Test Lead Connections for ROW1
Continued on next page...

102

Chapter 4 Calibration Procedures
Relay Verification

Tests 1-8 (ROW1): Open all channels on the module by performing a Factory Reset (press

again and select “Factory

For each test, close only the channels shown in the “Channels Closed”
column below (module in slot 200). Record the 4-wire ohms
measurements from the external DMM in the following table.

Test
#

Channel
Closed*

Measured Value

Test
Limit

Relay
Measured

1

Ch 11 & 41

________Ohms

2.00Ω

K101

2

Ch 12 & 42

________Ohms

2.00Ω

K102

3

Ch 13 & 43

________Ohms

2.00Ω

K103

4

Ch 14 & 44

________Ohms

2.00Ω

K104

5

Ch 15 & 45

________Ohms

2.00Ω

K105

6

Ch 16 & 46

________Ohms

2.00Ω

K106

7

Ch 17 & 47

________Ohms

2.00Ω

K107

8

Ch 18 & 48

________Ohms

2.00Ω

K108

Module Reference

and select “Recall State”; press
Reset”).

4

*Only the channel currently under test should be closed at one time. All other channels should be open.

Continued on next page...

103

Chapter 4 Calibration Procedures
Relay Verification

...Continued from previous page
Tests 9 - 16
(ROW2):

Move the HI, LO, Sense HI and Sense LO leads to ROW2 as shown
below.

Test Lead Connections for ROW2
Press and hold down
panel.

until “Card Reset” is displayed on the front

For each test, close only the channels shown in the “Channels Closed”
column below. Record the 4-wire ohms measurements from the external
DMM in the following table.
Test
#

Channel
Closed*

Measured Value

Test
Limit

Relay
Measured

9

Ch 21 & 41

________Ohms

2.00Ω

K201

10

Ch 22 & 42

________Ohms

2.00Ω

K202

11

Ch 23 & 43

________Ohms

2.00Ω

K203

12

Ch 24 & 44

________Ohms

2.00Ω

K204

13

Ch 25 & 45

________Ohms

2.00Ω

K205

14

Ch 26 & 46

________Ohms

2.00Ω

K206

15

Ch 27 & 47

________Ohms

2.00Ω

K207

16

Ch 28 & 48

________Ohms

2.00Ω

K208

*Only the channel currently under test should be closed at one time. All other channels should be open.

Continued on next page...

104

Chapter 4 Calibration Procedures
Relay Verification

...Continued from previous page

Module Reference

Tests 17 - 24
(ROW3):

Move the HI, LO, Sense HI and Sense LO leads to ROW3 as shown
below.

Test Lead Connections for ROW3
Press and hold down
panel.

until “Card Reset” is displayed on the front

For each test, close only the channels shown in the “Channels Closed”
column below. Record the 4-wire ohms measurements from the external
DMM in the following table.
Test
#

Channel
Closed*

Measured Value

Test
Limit

Relay
Measured

17

Ch 31 & 41

________Ohms

2.00Ω

K301

18

Ch 32 & 42

________Ohms

2.00Ω

K302

19

Ch 33 & 43

________Ohms

2.00Ω

K303

20

Ch 34 & 44

________Ohms

2.00Ω

K304

21

Ch 35 & 45

________Ohms

2.00Ω

K305

22

Ch 36 & 46

________Ohms

2.00Ω

K306

23

Ch 37 & 47

________Ohms

2.00Ω

K307

24

Ch 38 & 48

________Ohms

2.00Ω

K308

*Only the channel currently under test should be closed at one time. All other channels should be open.

Continued on next page...

104a

4

Chapter 4 Calibration Procedures
Relay Verification

...Continued from previous page
Tests 25 - 32
(ROW4):

Move the HI, LO, Sense HI and Sense LO leads to ROW4 as shown
below.

Test Lead Connections for ROW4
Press and hold down
panel.

until “Card Reset” is displayed on the front

For each test, close only the channels shown in the “Channels Closed”
column below. Record the 4-wire ohms measurements from the external
DMM in the following table.
Test
#

Channel
Closed*

Measured Value

Test
Limit

Relay
Measured

25

Ch 41 & 11

________Ohms

2.00Ω

K401

26

Ch 42 & 12

________Ohms

2.00Ω

K402

27

Ch 43 & 13

________Ohms

2.00Ω

K403

28

Ch 44 & 14

________Ohms

2.00Ω

K404

29

Ch 45 & 15

________Ohms

2.00Ω

K405

30

Ch 46 & 16

________Ohms

2.00Ω

K406

31

Ch 47 & 17

________Ohms

2.00Ω

K407

32

Ch 48 & 18

________Ohms

2.00Ω

K408

*Only the channel currently under test should be closed at one time. All other channels should be open.

104b

Chapter 4 Calibration Procedures
Relay Verification

(Optional)

34905A/06A Relay Contact Resistance Verification

1

Be sure to read “Plug-in Module Test Considerations” on page 87.

2

Prepare the module by connecting an SMB short to CH10, CH11,
CH12, and CH13. Connect the COM1 terminal to the DMM.
Be sure to use the correct SMB connectors for the module.

3

Install the module in slot 100.

4

Close Channel 11.

5

Measure the resistance on the DMM.

6

Repeat steps 4 and 5 for Channels 12, 13, and 14.

7

Repeat steps 2, 3, 4, 5, and 6 for the channels connected to COM2.

Module Reference

Note: Be sure to use the correct SMB connectors (50Ω or 75Ω).

Note: In general, a new relay should have a contact resistance of less
than 0.5Ω. Relays with contact resistance in excess of 1Ω should be replaced.

105

4

Chapter 4 Calibration Procedures
Relay Verification

(Optional)

34908A Relay Contact Resistance Verification
This optional procedure uses an external DMM to make 4-wire ohms
measurements across the relay contacts on the 34908A. Note that when
measuring the resistance of the contacts of the channels relays, the test
also includes the Bank Switch.
Note: Be sure to read “Plug-in Module Test Considerations” on page 87.

Test 1:

See the diagram on page 107 for the required connections for this test
(be sure to probe the inductor at the indicated location). For this
measurement, the 34908A is not installed in the 34970A. Record the
4-wire ohms measurements from the external DMM in the table below.

External DMM Ohmmeter Connections
Test
#

HI

LO

HI
Sense

LO
Sense

Measured
Value

1

L400

J101, C12

L400

J101, C12

__________ Ohms

106

Chapter 4 Calibration Procedures
Relay Verification

Module Reference

Note: Be sure to
probe from the
right-hand side
of the inductor.

4

Connections for 34908A Verification Test 1

107

Chapter 4 Calibration Procedures
Relay Verification

Tests 2 - 3:

Make the connections to the 34908A as shown in the diagram below.
Be sure to route your wiring for proper strain relief and install the
module cover. Install the 34908A in slot 200 of the 34970A. Open all
channels on the module by performing a Factory Reset (press
and select “Recall State”; press
again and select “Factory Reset”).
Configure Channel 01 as follows: DC volts, 10 volt range, and 51⁄2 digits.

Connections for 34908A Verification Tests 2 and 3
Enable reading monitoring by pressing
on the selected channel
(or use the ROUTe:MON command). Record the 4-wire ohms
measurements from the external DMM in the following table.

External DMM Ohmmeter Connections
Test
Channel
#
Configured
2
3

Ch 01

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

H Com

L Com

H Com

L Com

__________ Ohms

—

—

__________ Ohms

2.00Ω

K421

Subtract (Test 2 – Test 1)

108

Chapter 4 Calibration Procedures
Relay Verification

Tests 4 - 43:

Module Reference

Make the connections to the 34908A as shown in the diagram below.
Connect copper shorts between all channels as shown. Be sure to
route your wiring for proper strain relief and install the module cover.
Install the 34908A in slot 200 of the 34970A.

4

Connections for 34908A Verification Tests 4 through 43
For each test shown in the table starting on the next page, close only
the channels shown in the “Channels Closed” column (closing one
channel will open the previously closed channel). Record the 4-wire
ohms measurements from the external DMM in the table.

109

Chapter 4 Calibration Procedures
Relay Verification

External DMM Ohmmeter Connections
Test Channels
#
Closed*

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

4

Ch 1

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K401, K422

5

Ch 2

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K402, K422

6

Ch 3

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K403, K422

7

Ch 4

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K404, K422

8

Ch 5

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K405, K422

9

Ch 6

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K406, K422

10

Ch 7

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K407, K422

11

Ch 8

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K408, K422

12

Ch 9

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K409, K422

13

Ch 10

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K410, K422

14

Ch 11

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K411, K422

15

Ch 12

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K412, K422

16

Ch 13

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K413, K422

17

Ch 14

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K414, K422

18

Ch 15

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K415, K422

19

Ch 16

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K416, K422

20

Ch 17

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K417, K422

21

Ch 18

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K418, K422

22

Ch 19

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K419, K422

23

Ch 20

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K420, K422

* Only the channels currently under test should be closed at one time. All other channels should be open.

Continued on next page...
110

Chapter 4 Calibration Procedures
Relay Verification

... Continued from previous page

Test Channels
#
Closed*

HI

LO

HI
Sense

LO
Sense

Measured Value

Test
Limit

Relay
Measured

24

Ch 21

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K401, K422

25

Ch 22

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K402, K422

26

Ch 23

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K403, K422

27

Ch 24

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K404, K422

28

Ch 25

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K405, K422

29

Ch 26

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K406, K422

30

Ch 27

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K407, K422

31

Ch 28

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K408, K422

32

Ch 29

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K409, K422

33

Ch 30

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K410, K422

34

Ch 31

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K411, K422

35

Ch 32

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K412, K422

36

Ch 33

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K413, K422

37

Ch 34

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K414, K422

38

Ch 35

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K415, K422

39

Ch 36

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K416, K422

40

Ch 37

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K417, K422

41

Ch 38

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K418, K422

42

Ch 39

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K419, K422

43

Ch 40

H Com

L Com

H Com

L Com

__________ Ohms

2.00Ω

K420, K422

* Only the channels currently under test should be closed at one time. All other channels should be open.

Note: If the first 20 or last 20 relays have high resistance values, it is likely that relay K422 is bad.

111

Module Reference

External DMM Ohmmeter Connections

4

Chapter 4 Calibration Procedures
Thermocouple Reference Junction (Optional)

Thermocouple Reference Junction (Optional)
Note: You should perform these verification and adjustments if you
are using the modules for thermocouple measurements.
To make a thermocouple measurement a known reference junction
temperature measurement must be made. The reference junction
temperature is measured by two solid state temperature sensors in
the input connection area on the module. The adjustments store
calibration constants used to correct the measurements from the
temperature sensors.
Thermocouple measurements are only supported by the 34901A,
34902A and 34908A.

Thermocouple Reference Junction Verification
1

Read “Plug-in Module Test Considerations” on page 87.

2

Connect a calibrated thermocouple with an accuracy of 0.1 °C or
better to one of the following channels:
For the 34901A: Channel 10
For the 34902A: Channel 8
For the 34908A: Channel 10

3

Install the module in slot 100.

4

Place the J Type calibrated thermocouple at a known temperature
(ice bath or calibrator).

5

Select Channel 110 (or 108). Configure the channel as follows:
TEMPERATURE
THERMOCOUPLE
J TYPE
INTEG 10 PLC (Advanced menu)
INTERNAL REF (Advanced menu)
Before executing each test, you must press
to enable reading
monitoring on the selected channel (or use the ROUTe:MON command
from the remote interface).

6

Subtract the thermocouple error from the displayed temperature.
Verify the result is within ± 1.0 °C of the known temperature (set in
step 4).

112

Chapter 4 Calibration Procedures
Thermocouple Reference Junction (Optional)

Thermocouple Reference Junction Adjustments

1

Connect a 10 kΩ (YSI 44031) thermistor to each of the following channels
(a kit of five thermistors is available as Keysight part number 34308A):
For the 34901AChannels 6 and 17
For the 34902AChannels 6 and 11
For the 34908AChannels 6 and 16
Keep the thermistor leads as short as possible. Locate the thermistor
as near to the input connectors as possible.

Module Reference

These adjustments are plug-in module specific and only affect thermocouple measurements. The calibration constants created by these
adjustments are stored in non-volatile memory on the plug-in module.

4

34901A

2

Install the plug-in module in the mainframe in slot 200. Apply power
and allow a 2 hour warm-up.

3

Set 10 kΩ thermistor measurements on Channels 206 and 217
(or 206 and 211). Before executing each test, you must press
to enable reading monitoring on the selected channel (or use the
ROUTe:MON command from the remote interface).

4

Press
to enter the calibration menu. Press
begin the adjustment procedure.

5

Verify the adjustment (see page 112).

again to

113

Chapter 4 Calibration Procedures
34907A Analog Output

34907A Analog Output
Analog Output Verification Test
This procedure is used to check the calibration of the analog outputs
on the 34907A Multifunction Module. Install the module in slot 200.
Verification checks are performed only for those output values with
unique calibration constants.
1

Make connections to analog output channels as shown below.
To DMM

34907A

To
DMM

2

For each analog output, set each output value in the table below.
Compare measurement results to the appropriate test limits shown
in the table.
DAC
Output

Quick
Check

Measured
Output

Error from Nominal
1 year

0.000 V
10.000 V

Q

0.000 V
10.000 V

± 20 mV
± 45 mV

114

Chapter 4 Calibration Procedures
34907A Analog Output

Analog Output Adjustment

Module Reference

Note: Install the 34907A module in the mainframe and allow
a 45 minute warm-up before performing these procedures.
This adjustment procedure sets a zero adjustment and a gain
adjustment constant for each DAC output. You must perform all
the adjustments on one analog output channel before adjusting the
other analog output channel.
1

Install the module in slot 100.
Select the first analog output channel (104).

2

Connect an external DMM to the output terminals.

3

Set the analog output to 00.000 V.

4

Press
to enter the calibration menu. Press
begin the adjustment procedure.

5

Use the knob
and
to set the number in the display to the
measured output value and press
to complete the adjustment.

6

Set the analog output to 10.000 V.

7

Press
to enter the calibration menu. Press
begin the adjustment procedure.

8

Use the knob,
and
to set the number in the display to the
measured output value and press
to complete the adjustment.

9

Repeat steps 1 through 8 for Channel 105.

again to

4

again to

10 Perform the Voltage Output Verification Test on page 114 to verify
the adjustment.

115

116

5

5

Theory of Operation

Theory of Operation
This chapter is organized to provide descriptions of the circuitry
contained on each schematic shown in chapter 8. A block diagram
overview is provided followed by more detailed descriptions of the
circuitry contained in the schematics chapter.
• System Block Diagram, on page 119
• Floating Logic, on page 120
• Memory, on page 123
• Earth-Referenced Logic, on page 124
• Power Supplies, on page 125
• Front Panel, on page 127
• Backplane, on page 128
• Internal DMM, on page 129
• Switch Modules, on page 138
• Multifunction Module, on page 151
The self-test procedures are described in chapter 6.

118

Chapter 5 Theory of Operation
System Block Diagram

System Block Diagram
A simplified block diagram is shown below. A detailed system block
diagram is shown on page 221. Not all systems have an Internal
DMM. In these systems, the internal DMM connections to the analog
bus and the floating logic are left open. The major portions of each
block are described in the following sections.

5

119

Chapter 5 Theory of Operation
Floating Logic

Floating Logic
Unless otherwise noted, components in this discussion are located on
the A1 circuit assembly (34970-66501). The schematics are included
in Chapter 8 starting on page 224.
The floating common logic controls the operation of the entire
instrument. All measurement control and remote interface command
interpretation is performed in the main controller, U205. The front
panel controller, the I/O controller, and all of the plug-in module
controllers, act as slaves to U205. The floating common logic is
comprised of the main controller U205, custom ASIC U209,
calibration memory U201, 12 MHz clock oscillator U204, and
microprocessor supervisor U104.
The microprocessor supervisor U104 performs the following functions:
• Monitors the regulated 5V floating supply and generates the reset
signal for main controller U205 when the voltage drops below
operating levels.
• Monitors the unregulated side of the 5V floating supply in order to
generate an early warning signal (PWRFAIL) when power is lost.
• Provides automatic switch over to the battery BT101 for the
+5V_NV supply when the 5V_FLT supply drops below the
battery voltage.
• Blocks the main controller’s write signal (WR_N) while the
5V_FLT supply is below operating level.

120

Chapter 5 Theory of Operation
Floating Logic

The main controller, U205, is a 16-bit microcontroller incorporating
many built-in features:
• A 10-bit, successive approximation ADC with selectable inputs is
used to convert two signals: FLASH and FRQRNG. The FLASH
signal is the residual charge on the main integrating ADC output
from the internal DMM assembly (A4). The FRQRNG signal
(also from the internal DMM) is used to make voltage ranging
decisions for frequency and period measurements.
• A pulse-width-modulation port, after filtering the 23 kHz output with
R221,C224, and R259, produces DC voltages between 0V and 5V.
This voltage, PREADJ, is used to adjust the precharge amplifier
offset voltage in U101 on the internal DMM assembly (A4).
• A full, UART controlled, serial port is used to communicate with
the I/O processor through optoisolators U303 and U214. Data is
sent in an 11-bit frame at a rate of 187.5 kbits/second. The 11-bit
frame is configured for one start bit, nine data bits, and one stop bit.
• A timer is used to measure the power line frequency on LSENSE.
Frequencies between 55 Hz and 66 Hz result in the use of a 60 Hz
standard for the DMM integration period. All other frequencies
will result in the use of a 50 Hz standard.

5

• A 16-bit counter counts pulses on CNT to create, along with the
8-bit counter in U209, a 24-bit counter for the internal DMM.

121

Chapter 5 Theory of Operation
Floating Logic

The custom ASIC, U209, provides:
• Memory Address mapping – The main controller multiplexes
address and data on the same bus. U209 latches the address and
drives a separate memory address bus (MA(19:1)). U209 allows the
main controller to access a much larger memory space than its
16-bit address bus would allow. It also partitions memory into
separate data and instruction segments and a “mappable” segment
that can be used for either data or instructions.
• Communications – U209 provides three serial communication
ports. A 187.5 kbit/second, 9 data bit, UART for communicating
with the isolated backplane (FLT_BPDO and FLT_BPDI_N). A
duplicate, 9-bit UART to communicate with the front panel (FPDO
and FPDI). And a simple, 1.5 Mbit/second, clocked shift-register to
control the configuration registers on the DMM assembly
(CFG_SCK, CFG_DO, and CFG_DI).
• Real Time Clock – U209 provides time of day and date, a periodic
interrupt, and a squarewave generator. The date is based on a 100
year calendar (it accurately tracks leap years until its two digit
year counter rolls over). U209 uses the battery-backed +5V_NV
supply.
• DMM support – U209 provides conversion logic for the
analog-to-digital converter and a counter for both the ADC and the
frequency measurement features of the DMM. When used for the
ADC, the COMP input functions both as a clocked comparator and
the slope counter input. When used for frequency measurement,
FREQIN is the input to the counter. In both cases, the 8-bit
counter produces the lower bits of a 24-bit counter. The counter
overflow signal, CNT, is counted by U205 to produce the upper
16-bits of the count. The SYNC signal produced by U205, is used
to latch the count.
Device U201 is a 512 byte, ferroelectric RAM that is accessed via a
serial interface. This device only contains data relevant to the A1
assembly. This data is combined with data retrieved from A4U450 to
completely calibrate the internal DMM. The two devices, although on
different assemblies, share the same I/O signals, CALSCK and
CALDAT, that allow them to be read (and written) by U205.

122

Chapter 5 Theory of Operation
Memory

Memory
Unless otherwise noted, components in this discussion are located on
the A1 circuit assembly (34970-66501). The schematics are included
in Chapter 8 starting on page 224.
The main controller, U205, uses 512 Kbytes of ROM and 544 Kbytes
of RAM. ASIC U209 provides the memory mapping that allows access
to this large memory space. The memory map as seen by the main
controller is as follows:
Address
0100H thru 1FBFH

Maps to
00100H thru 01FBFH in RAM for data fetches

0100H thru 1FBFH
1FC0H thru 1FDFH
2000H thru 5FFFH

00100H thru 01FBFH in ROM for instr. fetches
registers in U209
02000H thru 05FFFH in ROM

6000H thru 7FFFH
6000H thru 7FFFH
8000H thru FFFFH

06000H thru 07FFFH in RAM for data fetches
06000H thru 07FFFH in ROM for instr. fetches
any selected 32 Kbyte page of ROM or RAM

The memory is organized with a 16-bit data bus (AD(15:0)) and a
19-bit address bus (MA(19:1)). The memory address is produced by
U209 latching the address present on AD(15:0) when U205 asserts
ALE_FLT. Reads of memory are always 16-bits wide (there is a single
RD_N signal). Writes, however, can be byte-wide and therefore U209
produces both a high-byte write strobe, MWRH_N, and a low-byte
write strobe, MWRL_N. These write signals are based on the latched
0-bit of the address and the BHE_N signal produced by the main
controller, U205.
The ROM memory consists of a single, 256Kx16 device, U401.
The RAM memory consists of five devices: U402, U403, U404, U405,
and U410. A uniform, 256Kx16, memory block is formed by the four
128Kx8 devices, U402 through U405. A separate, 32Kx8 block is formed
by U410 and is available through special programming of U209.

123

5

Chapter 5 Theory of Operation
Earth-Referenced Logic

Earth-Referenced Logic
Unless otherwise noted, components in this discussion are located on
the A1 circuit assembly (34970-66501). The schematics are included
in Chapter 8 starting on page 224.
The earth-referenced logic circuits provide all rear panel input/output
capability. Microprocessor U305 handles GPIB (IEEE-488) control
through bus interface chip U309 and bus receiver/driver chips U310
and U311.
The RS-232 interface is controlled by U305 through U307. RS-232
transceiver chip U308 provides the required level shifting to
approximate ± 9 volt logic levels through on-chip charge-pump power
supplies using capacitors C317 through C320. Communication
between the earth referenced logic interface circuits and the floating
measurement logic is accomplished through an optically-isolated
bi-directional serial interface. Isolator U214 couples data from U305
to microprocessor U205. Isolator U303 couples data from U305 to
microprocessor U205.
U305 also:
• Controls power to the backplane as well as all rear panel interfaces
(GPIB, RS-232, Alarms, External Triggers). Backplane power is
turned on or off based upon commands received from U205.
• Drives the backplane reset signal (BPRST) based upon commands
from U205.
• Monitors the backplane service request (BPSRQ_N) and reports to
U205 when it is asserted.
U306B, U306C, U306D, and U306E drive the alarm outputs. The alarm
is a low true signal at the sub miniature D connector on the rear
panel. U306F drives the channel closed output signal.
The external trigger input is buffered by U304C and U304D.

124

Chapter 5 Theory of Operation
Power Supplies

Power Supplies
Unless otherwise noted, components in this discussion are located on
the A1 circuit assembly (34970-66501). The schematics are included
in Chapter 8 starting on page 224.
The instrument uses two types of power supplies: floating supplies
and earth referenced supplies. The floating supply outputs are ±18 Vdc,
+5 Vdc, and a 6 Vrms center tapped filament supply for the vacuum
fluorescent display. The earth referenced and backplane circuits are
powered from a single +5 Vdc supply.
The ac mains are connected by module P1. This module includes the
functions of mains connection and line voltage selection (100/120/
220/240). The internal DMM automatically configures for the applied
line frequency by counting the frequency of the output of clamp
circuit CR106, R102, C103 (LSENSE).
The +5 volt floating supply is produced by bridge rectifier CR105,
filter capacitor C104, and regulator U103. The output of CR105 is
sensed by U104 and compared to the the voltage from battery BT101.
U104 turns on the +5 V floating supply through Q120. If the output
of CR105 falls below 6.8 V, U104 provides a PWRFAIL signal to the
main processor. At initial power on, U104 resets the main processor
with the FLT_RST line. This supply powers all floating logic.
The internal DMM relay drive circuits are also powered from this supply.
The floating ±18 volt supplies are produced by bridge rectifier CR109,
filter capacitors C107 and C109, and regulators U105 and U106.
These supplies are used to power all measuring circuits. In addition,
the vacuum fluorescent display is driven from the ±18 volt supplies.
A separate winding of T1 provides a center tapped 6 Vrms filament
supply for the display. Q110A and Q110B turn on and off the
filament supply in response to the FILPWR signal from the main
controller through U107A.

125

5

Chapter 5 Theory of Operation
Power Supplies

The 5 volt earth referenced supply (+5V_ER) is produced by rectifier
CR101, CR102, CR103, CR104, and regulator U101. This supply is
earth referenced by the screw which mounts the PC board to the
instrument chassis.
The unswitched +5V_ER supplies U305, U303, U320, and U302.
The rear-panel interfaces (GPIB, RS-232, Alarms, and external
triggers) are powered from the switched +5V_BP supply to ensure
that when power is turned off no voltages are present at the interfaces.
The +5V_ER supply is switched by Q101A and Q101B to create the
+5V_BP (backplane) and fan power supplies.
Undervoltage sensor U102 provides the earth reference controller
reset at initial power on.

126

Chapter 5 Theory of Operation
Front Panel

Front Panel
Unless otherwise noted, components in this discussion are located
on the A2 circuit assembly (34970-66502). The schematics are
included in Chapter 8 starting on page 229.
The front-panel circuits consist of vacuum fluorescent display control,
display high voltage drivers, and keyboard scanning. Communication
between the front panel and floating logic circuits is accomplished
through a 2-wire bi-directional serial interface. The front-panel logic
operates from -13 volts (logic 1) and -18 volts (logic 0). The two serial
communication signals are level shifted by comparator U6 from the
floating logic 0 V to 5 V levels to the -18 V to -13 V levels present on
the front panel assembly. The front panel logic high supply (-13 volts)
is produced from the -18 volt supply by voltage regulator U7.
Display anode and grid voltages are +18 volts for an on segment and
-18 volts for an off segment. The -11 V cathode bias for the display is
provided by the main pc boards filament winding center tap bias
circuit A1CR108, A1R106, and A1C106 shown on the power supply
schematic (see page 224).
Keyboard scanning is accomplished through a conventional scanned
row-column key matrix. Keys are scanned by outputting data at
microprocessor U1 port pins P0.0 through P0.4 to poll each key
column for a key press. Column read-back data are read by the
microprocessor at port pins P2.0 through P2.3 for decoding and
communication to the floating logic circuits. Rotary knob quadrature
inputs are read directly by the microprocessor port pins P2.6 and P2.7.

5

The standby power switch, S19, provides a low true signal to main
controller A1U205. In turn, A1U205 takes actions that either place
the instrument in the “standby mode” or “on” mode. In “standby”,
both the filament supply to the front panel and the +5V_BP supply to
the backplane, rear panel interfaces, and fan are turned off.

127

Chapter 5 Theory of Operation
Backplane

Backplane
Unless otherwise noted, components in this discussion are located
on the A3 circuit assembly (34970-66503). The schematics are
included in Chapter 8 starting on page 231.
The backplane contains three connectors, P101, P102, and P103 for
connection to the plug-in modules. The parallel lines in these
connectors are divided into two groups to form the analog bus and
digital bus.

Analog Bus
The analog bus connects the signals from the plug-in modules to the
Internal DMM. There are five lines in the analog bus, HI, LO,
OHMS_HI, OHMS_LO, and AMPS. The HI and LO lines are
protected from overvoltages by E101, E102, RV101, RV102, R101,
R160, L101, L102, and C109.
P105 makes the analog bus connection to the internal DMM.

Digital Bus
The digital bus uses 10 lines for communication and control. P104
makes the digital bus connection to the earth referenced logic and
floating logic.

Signal
Slot ID
DATA_IN
DATA_OUT
DGND
+5 V
Earth Ground
RST
SRQ

128

P101, P102, P103
Pins
A6, A7, A8
B6
C6
A5, B5, B7, C5, C7
A3, B3, C3
A1, B1, C1
B8
C8

Comments
Unique binary code for each slot.
Serial module data from the floating logic.
Serial module data to the floating logic.
Earth referenced digital ground.
Earth referenced module power supply.
Earth referenced zap return ground.
Module reset from the earth referenced logic.
Module service request to the earth
referenced logic.

Chapter 5 Theory of Operation
Internal DMM

Internal DMM
DMM Block Diagram
The internal DMM block diagram is shown on the system block
diagram on page 221. A portion of the block diagram is shown below.

5
Backplane

Main Controller

129

Chapter 5 Theory of Operation
Internal DMM

Input
Unless otherwise noted, components in this discussion are located on
the A4 circuit assembly (34970-66504). The schematics are included
in Chapter 8 starting on page 234.
The purpose of the Input section is to connect the Input HI terminal to
the various measuring functions. This is accomplished through K102,
K103, and K104. Additionally, connections are made for the 4-wire
ohms HI Sense and LO Sense inputs. Shunt selection (ranging) and
voltage sensing are also performed for the current function. The table
below shows the state of each relay for each measuring function.
All relay coils are driven from U150.
Function
0.1 V – 10 Vdc
100 V – 300 Vdc
2-Wire Ohms
4-Wire Ohms
AC Voltage
Frequency/Period
3 A, 1A DC I
100 mA, 10 mA DC I
1A AC I

K102

K103

K104

Sense at:

Set
Set
Reset
Reset
Set
Set
Reset
Set
Reset

Set
Reset
Set
Set
Reset
Reset
Reset
Reset
Reset

Set [1]
Set
Reset [2]
Reset [2]
Reset
Reset
Reset
Reset
Set

U101-5
U102-12
U101-5
[3]
AC_IN
AC_IN
U101-10
U101-10
AC_IN

[1] K104 will be reset when input resistance is selected to >10,000 MΩ through the menu.
[2] K104 will be set for the 100 MΩ range.
[3] Configurations shown are for the current source output (HI) terminal. The measurement
sense is accomplished through the Sense HI / Sense LO terminals.

130

Chapter 5 Theory of Operation
Internal DMM

Input Amplifier
Unless otherwise noted, components in this discussion are located on
the A4 circuit assembly (34970-66504). The schematics are included
in Chapter 8 starting on page 234.
The DC Amplifier circuit is used by every measuring function except
frequency and period. Analog switch U101B selects various input
signals for measurement by the ADC. Switch U101B has three
sources which can be dynamically selected: measure customer input
(MC), measure zero input (MZ), and precharge (PRE). The MC state is
the actual input measurement. The MZ state measures internal
offset voltages which are also present in the MC measurement. The
final measurement result is computed from MC–MZ. The PRE state
is used to “precharge” internal capacitances to reduce charge
injection to the input terminal from the dynamic switching of MC and
MZ. Autozero off disables the dynamic switching of the amplifier
input. However, a new MZ value is automatically taken whenever a
new function or range is selected, even if autozero is turned off.
In the dc voltage function, ranging is accomplished through both
input relay switching (K102–K104) and solid state switching (U101).
As a result, the input to the ADC has the same nominal 10 V value for
a full scale input on each range. The dc input amplifier is comprised
of source follower dual FET U104, amplifier U106, and associated
bias circuitry. The feedback resistors U102C and switches U101C
select non-inverting amplifier gains of x1, x10, and x100 for the dc
input amplifier circuit. Amplifier output ADIN drives the dc input to
the a-to-d converter for all measuring functions.
DCV Range
100 mV
1V
10 V
100 V
1000 V

U102A Divider

1/100
1/100

U101 Input
Pin 5
Pin 5
Pin 5
Pin 8
Pin 8

Amplifier Gain
x100
x10
x1
x10
x1

ADC Input
10 V
10 V
10 V
10 V
10 V

131

5

Chapter 5 Theory of Operation
Internal DMM

In the DC current function, a current is applied between the Input I
and LO terminals. Ranging is accomplished by relay K102 and
amplifier gain switching in U101. Since a known resistor (the shunt
resister) is connected between these terminals, a voltage proportional
to the unknown current is generated. The voltage sensed at R121 is
measured by the multimeter’s dc circuitry. The table below illustrates
the dc current measuring function configurations.
DCI Range
1A
100 mA
10 mA

Shunt
Resistor

U101–10
Input

Amplifier
Gain

ADC Input

0.1Ω
5.1Ω
5.1Ω

100 mV
510 mV
51 mV

x100
x10
x100

10V
5.1V
5.1V

Resistance measurements are made by applying a known current
through an unknown resistance. The resulting voltage drop across the
unknown resistance is then measured by the multimeter’s dc circuitry.
The 100 MΩ range is measured using the known internal 10 MΩ
resistance (U102A) in parallel with the unknown input resistance
while applying the 500 nA current source. The result is computed
from the measured data. The internal 10 MΩ resistance is determined
whenever a zero calibration is performed.
In the 2-wire ohms function, the voltage drop is measured across
the Input HI and Input LO terminals. In the 4-wire ohms function,
the voltage is measured across the HI Sense and LO Sense terminals.
Lead resistances in series with the current source (Input HI–LO) are
not part of the final measurement. However, they do reduce the
available current source compliance voltage for the resistor under
test. The ohms current source will become non-linear when the
compliance voltage limit is exceeded. The full scale voltage developed
across the unknown resistor and the dc amplifier gain for each
resistance range are tabulated below.
Ohms Range Voltage Across R
100 Ω
100 mV
1V
1 kΩ to 100 kΩ
5V
1 MΩ
5V
10 MΩ
4.5 V
100 MΩ

132

Amplifier Gain
x100
x10
x1
x1
x1

ADC Input
10 V
10 V
5V
5V
4.5 V

Chapter 5 Theory of Operation
Internal DMM

Ohms Current Source
Unless otherwise noted, components in this discussion are located
on the A4 circuit assembly (34970-66504). The schematics are
included in Chapter 8 starting on page 234.
The ohms current source flows from the Input HI terminal to the Input
LO terminal for both the 2-wire and 4-wire ohms functions. Each
current value is generated by forcing a stable, precise voltage across a
stable resistance. The value of the current becomes part of the range
gain constant stored during calibration.
The +7 V reference voltage is used to generate a stable reference
current with U201A. R201 and R202 are the resistance references for
the current sources as shown in the table below. The IREF current is
used to produce a precise voltage drop across the 28.57 kΩ resistor in
U102D-4. The IREF generated using R202 produces an approximate
5 V drop across the 28.57 kΩ resistor. The IREF generated using
R201 produces an approximate 0.5 V drop. This voltage is used to
force a reference voltage across the selected current source range
resistor (5 kΩ, 50 kΩ, 500 kΩ, 1 MΩ) by U201B. The resulting
precision current flows through JFET Q202 and protection circuit
Q203 to Q211, and CR202 to relay K102 where it is switched to the
Input HI terminal for ohms measurements.

5

The protection circuits are designed to protect the ohms current
source from inadvertently applied voltages in excess of ±1000 V.
Protection from large positive voltages is provided by the reverse
breakdown voltage of CR202. Protection from large negative voltages
is provided by the sum of the collector to base breakdown voltages of
Q203, Q205, Q207, and Q209. Bias for these transistors is provided
by Q211 and R203 to R206 while negative over voltages are applied.
Ohms Range
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ [1]

Current
1 mA
1 mA
100 µA
10 µA
5 µA
500 nA
500 nA [1]

Open Circuit Compliance
Reference
Voltage
Limit
R202
2.5 V
9V
R202
2.5 V
9V
R202
4V
9V
R202
4V
9V
R202
8V
9V
R201
10 V
14 V
R201
5V

Isource R
U102D
5 kΩ
5 kΩ
50 kΩ
500 kΩ
1 MΩ
1 MΩ
1 MΩ

[1] Measured in parallel with the internal 10 MΩ resistor.

133

Chapter 5 Theory of Operation
Internal DMM

AC Circuit
Unless otherwise noted, components in this discussion are located
on the A4 circuit assembly (34970-66504). The schematics are
included in Chapter 8 starting on page 234.
The multimeter uses a true RMS ac-to-dc converter to measure ac
voltages and currents. The ac-to-dc converter changes the input ac
voltage to a dc voltage. All voltage ranging is performed in the ac circuit
so that the input to the multimeter’s dc circuitry (AC_OUT) is
nominally 2 Vdc for a full scale ac input. The dc amplifier is always
configured for x1 gain in ac functions (voltage, current, frequency,
and period). Relay K104 connects the ac circuit to either the Input HI
terminal or to R121, the current function voltage sense point. Note that
the input to the ac circuit may contain a dc bias from the applied
ac signal.
Input coupling capacitor C301 blocks the dc portion of the input signal.
Only the ac component of the input signal is measured by the multimeter.
The ac circuit voltage ranging comprises two gain stages U301 and
U305/U312. The voltage gains for each stage are tabulated below.
Function

Range

ACV, Freq,
or Period

100 mV
1V
10 V
100 V
300 V
10 mA
100 mA
1A

ACI

Shunt
Resistor

5.1Ω
0.1Ω
0.1Ω

1st Stage

2nd Stage

ADC Input

x0.2
x0.2
x0.2
x0.002
x0.002
x0.2
x0.2
x0.2

x100
x10
x1
x10
x1
x100
x100
x100

2 Vdc
2 Vdc
2 Vdc
2 Vdc
1.4 Vdc
0.2 Vdc
1 Vdc
2 Vdc

The 1st stage is a compensated attenuator implementing a gain of
x0.2 or x0.002 as selected by U304A and U304D. Each voltage range
has a unique 50 kHz frequency response correction produced by a
programmable variable capacitor connected across R304.

134

Chapter 5 Theory of Operation
Internal DMM

The programmable capacitance is implemented by varying the signal
level across a compensating capacitor. In the x0.2 configuration,
low frequency gain is set by R301, R302, and R304. The variable gain
element U302/U303 essentially varies the value of C306 from 0 to 1
times its value in 256 steps. The exact gain constant is determined
during the 50 kHz ac voltage range calibration procedure. In the
x0.002 configuration, low frequency gain is set by R301, R302, and
R303. The variable gain element U302/U303 essentially varies the
value of C305 plus C306 from 0 to 1 times their value in 256 steps.
The exact gain constant is determined during the 50 kHz ac voltage
range calibration procedure.
The second stage is made up of two amplifiers (U305 and U312) each
configured for a fixed gain of x10. Overall 2nd stage gains of x1, x10,
and x100 are produced by routing the 1st stage output either around,
or through one or both amplifiers as shown in the table below.
2nd Stage Gain
x1
x10
x100

U306A
ON
OFF
OFF

U306B
OFF
ON
ON

U306C
OFF
OFF
ON

U306D
OFF
ON
OFF

U304C
OFF
OFF
ON

The output of the 2nd stage is connected to the rms-to-dc converter
stage. Any residual dc offset from the amplifier stages is blocked by
capacitor C316. Buffer U307 drives the input to the rms-to-dc converter
as well as the frequency comparator (U310A) input. The rms-to-dc
converter has two selectable averaging filters (C318 and C318 plus
C321) for the analog computer circuit of U308. The two analog
averaging filters together with digital filters running in the main
CPU implement the three selectable ac filters: slow, medium, and
fast. The faster analog filter (using C318) is used for all AC V, AC I,
and frequency or period autoranging. The slower analog filter is used
only with the slow and medium ac filter choices.

5

In frequency or period measurements, U310A generates a logic signal
(FREQIN) for every input zero crossing. The ac sections FREQRNG
dc output is measured directly by the main CPU’s 10-bit ADC during
frequency or period measurements. This lower resolution measurement
is sufficient to perform voltage ranging decisions for these functions.
The frequency comparator output is disabled during ac voltage and
current measurements by U310B forcing U310A’s input to –15 volts.

135

Chapter 5 Theory of Operation
Internal DMM

A-to-D Converter
Unless otherwise noted, components in this discussion are located
on the A4 circuit assembly (34970-66504). The schematics are
included in Chapter 8 starting on page 234.
The analog-to-digital converter (ADC) is used to change dc voltages
into digital information (schematic shown on page 9-12). The circuitry
consists of an integrator amplifier (U402 and U420), current steering
switch U411, resistor network U102E, voltage reference U403, ADC
controller U209, and residue ADC U205.
The ADC method used is called multislope III. It is based on patented
Keysight ADC technology. Multislope III is a charge balancing
continuously integrating analog-to-digital converter. The ADC charge
balancing algorithm is always running, even when the multimeter is not
triggered. The input voltage continuously forces charge onto the
integrator capacitors C400 and C401 through U102E–R16.
Switches U411A and U411B steer fixed positive or negative reference
currents onto the integrator capacitor to cancel, or balance, the
accumulated input charge. The level shifted (R403 and R406) output
of the integrator is checked every 2.66 µs by the A1U209 COMP
input. Logic state machines in A1U209 control the U411 current
steering to continuously seek an approximate 2.5 V level on the
integrator amplifier output, FLASH. If the ADC input voltage ADIN
is between ±15 V, the integrator output (FLASH) will remain within
the 0 V to 5 V range of the A1U205 on-chip ADC. An input greater
than +15 V may cause the integrator output (U402–6) to saturate at
about –18 V. An input less than –15 V may cause U402 to saturate
with an output of about +18 V. The A1U205 ADC input (FLASH) is
clamped to 0 V or 5 V by R405 and CR403 to protect A1U205.
The integrator amplifier is formed by U402 and U420. Resistors R420
and R421 affect the amplifier stability. Amplifier oscillation may
occur if their values are incorrect. Amplifier U420 improves the offset
voltage characteristics of integrator amplifier U402.

136

Chapter 5 Theory of Operation
Internal DMM

Each analog-to-digital conversion begins when the multimeter is
triggered. The ADC starts by clearing the integrator slope count in
A1U209. At the end of the integration period, the slope count is
latched. The slope count provides the most significant bits of the
input voltage conversion. The least significant bits are converted by
the on-chip ADC of CPU A1U205.
The instrument precision voltage reference is U403. Resistor R409
provides a stable bias current for the reference zener diode. R408
and CR404 provide a bias to assure that the reference zener biases to
+7 V during power up. IC U400A amplifies the voltage reference to
+10 V while amplifier U401A inverts the +10 V reference to –10 V.
The reference voltages force precision slope currents for the
integrating ADC through U102E–R17, R18.

5

137

Chapter 5 Theory of Operation
Switch Modules

Switch Modules
In general, all the switch modules share a common module control
circuitry. This circuitry is described below. Each module is described
in further detail on the following pages.
Switch Module
Name
34901A
20 Channel MUX with T/C Compensation

Page
142

34902A

16 Channel Reed MUX with T/C Compensation

144

34903A
34904A
34905A

20 Channel Actuator
4 X 8 Matrix Switch

146
147
148

34906A
34908A

50 Ω Dual 4:1 VHF MUX
75 Ω Dual 4:1 VHF MUX
40 Channel Single-Ended MUX with T/C Compensation

148
149

Switch Module Control
A simplified block diagram of a typical module controller is shown below.

138

Chapter 5 Theory of Operation
Switch Modules

In addition to the +5 Volt power supply (Vcc) and ground, the module
controller uses four lines for control and communication:
• RESET, from the Earth Referenced Logic A1U305. RESET is
common to all three slots. The module controller performs a reset
when this line goes high. Reset conditions vary for each plug-in.

Module Reference

• SRQ, to the Earth Referenced Logic A1U305. The SRQ line is a
wired-OR line that can be driven by any plug-in. Consequently,
any module that asserts SRQ (line low), asserts this line in all
other slots and at the Earth Reference Logic.
• DATA IN, from the Floating Logic A1U205 via the opto isolator
A1U312. This line is connected in common to all three slots.
• DATA OUT, from the module controller to the Floating Logic
A1U205 via the opto isolator A1U213. This line is a wired-OR line
that can be driven by any module.
The DATA IN and DATA OUT lines are optically isolated from the
floating logic controller. These lines communicate with the Floating
Logic using an asynchronous serial bit stream.
The serial communications use an 11 bit protocol; a start bit, 8 data
bits, an attention bit, and a stop bit. The attention bit is 1 if the
8 data bits are an address/command, or 0 if the 8 data bits modify
or provide data for the previously sent command.

5

The module controller uses the hardwired slot-ID bits to decode the
serial bit stream address. When the address/command message
address matches the slot-ID, the plug-in is selected and responds to
the following commands. All other plug-ins will ignore the commands
until a new address/command message is received.
A 12 MHz crystal, Y101 is the clock for the module controller.
The module ID is a four bit pattern set through R106, R107, R108,
and R109. The Ferro-electric RAM U150 provides data storage of the
relay usage on the module (see page 55) and the thermocouple reference
junction temperature corrections (see page 112). Data in and out of
U150 is serial.
The 34901A, 34902A, and 34908A each have two onboard, solid state
temperature sensors, U151 and U152, physically located near the
isothermal block at the input connections. The temperature sensors
are used as the thermocouple temperature reference.

139

Chapter 5 Theory of Operation
Switch Modules

U101 controls the relays on the module using an 8-bit data bus and
three control lines. The data lines are latched and applied to the
relay drivers.
U101 enters a low-power idle mode when inactive. U101 responds
when a command is received or when a scheduled reference junction
temperature measurement is taken.
The relays use a buffered +5 Volt power supply. U101 supplies two
drive enable lines (DR_EN and +5NL_EN) that connect Vcc from the
digital bus with the relay drive lines through Q101 (+5R or +5NL).
To minimize the current through DGND caused by static discharge,
the ground return (ZGND) is isolated from the backplane ground
through a bead L102.

Relay Drivers
Two types of single-coil relays are used on the switch modules:
latching and non-latching. Typical driver configurations are shown below.

140

Chapter 5 Theory of Operation
Switch Modules

The non-latching relay contacts are in the set position (closed) when
current flows through the coil. When the current is removed, the
relay resets (opens). The positive side of the relay coil is connected to
+5NL. The negative side of the relay coil is connected to ZGND
through a single NPN transistor. The transistor and +5NL must be
on for the relay to stay in the set position.

Module Reference

The polarity of the current flow through the latching relay coil
determines the set (closed) or reset (open) position of the relay
contacts. Latching relays are driven by row and column latches or
complimentary transistor pairs.
To set a relay (close a channel) in the row column driver circuitry,
the appropriate row driver PNP transistor is turned on connecting
the +5R supply to the positive side of several relay coils and ZGND is
applied to the negative side of the desired relay coil through a column
driver NPN transistor. To reset a relay, ZGND is applied through an
NPN row driver transistor and +5R through a PNP column driver.
Tree latching relays are driven by complimentary transistor pairs
that steer the current through the relay coil.
The +5R supply is only enabled while the relay changes state. The
table below shows the times required for the relays to change state.
Switch Module
34901A
34902A
34903A
34904A
34905A/06A
34908A

Open
6 ms
0.40 ms
6 ms
6 ms
10 ms
6 ms

5

Close
6 ms
1.25 ms
6 ms
6 ms
15 ms
6 ms

141

Chapter 5 Theory of Operation
Switch Modules

34901A
Components in this discussion are located on the A1 circuit assembly
(34901-66501). The schematics are included in Chapter 8 starting on
page 239.
The control circuitry has four groupings of latches, relay drivers and
relays. The three control lines (SEL_A, SEL_B, and SEL_C) from the
module controller are divided into five control lines by the binary to
octal converter U109.

The row latch, U102, and column latches, U103 and U104, control the
relays. The row drivers are divided into four groups of set and reset
drivers. Each group of row drivers controls five relays. The column
drivers operate as a pair. There are ten column drivers each
controlling two relays. The analog bus backplane relays are
non-latching.

142

Chapter 5 Theory of Operation
Switch Modules

The 20 channels are divided into two banks. The banks are combined
by closing K422 for voltage and 2-wire Ohms switching. When K422
is open, the banks are electrically independent of each other and this
configuration is used for 4-wire Ohms multiplexing where the Ohms
current sources are connected to channels 1 through 10 and the sense
is obtained from channels 11 through 20. K421 and K423 control the
connection to the analog bus for measurements using the Internal DMM.

Module Reference

K422

5

The current measurement channels are selected by relay K522.
Relays K523 and K524 short the inputs when a channel is not
selected. Relay K521 makes the connection to the analog bus for
measurement by the Internal DMM.

143

Chapter 5 Theory of Operation
Switch Modules

34902A
Components in this discussion are located on the A1 circuit assembly
(34902-66501). The schematics are included in Chapter 8 starting on
page 245.
The control circuitry has of two groupings of latches, relay drivers
and relays. The 16 voltage and resistance measurement channels are
directly driven. Tree switching controls the 2-wire/4-wire Ohms
operation and connections to the analog bus.

The reed relays are non-latching and the relay driver and +5R is
applied while a channel is closed.

144

Chapter 5 Theory of Operation
Switch Modules

The 16 channels are divided into two banks. The banks are combined
by closing K327 for voltage and 2-wire Ohms switching. When K327
is open, the banks are electrically independent of each other and this
configuration is used for 4-wire Ohms multiplexing where the Ohms
current source is connected to channels 1 through 8 and the sense is
obtained from channels 9 through 16. Relays K326 and K328 control
the connection to the analog bus for measurements using the
internal DMM.

Module Reference

5

145

Chapter 5 Theory of Operation
Switch Modules

34903A
Components in this discussion are located on the A1 circuit assembly
(34903-66501). The schematics are included in Chapter 8 starting on
page 250.
The control circuitry has two grouping of latches, relay drivers and
relays. The 20 channels are, for control purposes, arranged into
8 rows by 10 columns.

The row latch, U102, and column latches, U103 and U104, control the
relays. The row drivers are divided into four groups of set and reset
drivers. Each group of row drivers controls five relays. The column
drivers operate as a pair. There are ten column drivers each
controlling two relays.
The 34903A provides 20 channels of Form C switching.

146

Chapter 5 Theory of Operation
Switch Modules

34904A
Components in this discussion are located on the A1 circuit assembly
(34904-66501). The schematics are included in Chapter 8 starting on
page 254.
The control circuitry has four groupings of latches, relay drivers and
relays divided into 4 rows by 8 columns.

Module Reference

5

The row latch, U102, and column latch U103, control the relays.
The row drivers are divided into four groups of set and reset drivers.
Each group of row drivers controls eight relays. The column drivers
operate as a pair. There are eight column drivers each controlling
four relays. The relays are arranged in 4 rows by 8 columns.

147

Chapter 5 Theory of Operation
Switch Modules

34905A/34906A
Components in this discussion are located on the A1 circuit assembly
(34905-66501 or 34906-66501). The schematics are included in
Chapter 8 starting on page 258.
The control circuitry has of two grouping of buffers, relay drivers and
relays, one for each multiplexer bank.

Bank1 latch, U102, and Bank2 latch, U103, control the relays. The bank
drivers are divided into six groups of set and reset drivers. Each set
and reset driver controls one relay. The column drivers operate as a
pair. There are six column drivers each controlling a relay. The relays
are arranged into two independent banks:

148

Chapter 5 Theory of Operation
Switch Modules

34908A
Components in this discussion are located on the A1 circuit assembly
(34908-66501). The schematics are included in Chapter 8 starting on
page 267.

Module Reference

The control circuitry has three grouping of latches, relay drivers and
relays. The 40 voltage and resistance measurement channels are, for
control purposes, arranged into 8 rows by 10 columns. Tree switching
controls bank selection and connections to the analog bus.

5

The row latch, U102, and column latches, U103 and U104, control the
relays. The row drivers are divided into four groups of set and reset
drivers. Each group of row drivers controls five relays. The column
drivers operate as a pair. There are ten column drivers each
controlling two relays. The analog bus backplane relays are
non-latching.

149

Chapter 5 Theory of Operation
Switch Modules

A single relay is used to switch two input channels. The choice of
which channel is connected to the common is performed by relay K422.
Channels are paired 20 channels apart (Ch 1 with Ch 21, Ch 2 with
Ch 22, etc.) Relay K421 connects the common to the backplane
analog bus for use with the internal DMM.

150

Chapter 5 Theory of Operation
Multifunction Module

Multifunction Module
The 34907A Multifunction module contains two 8-bit digital input/
output ports, a totalizer input, and two 16-bit analog outputs.

Multifunction Control

Module Reference

Components in this discussion are located on the A1 circuit assembly
(34907-66501). The schematics are included in Chapter 8 starting on
page 261.
A simplified block of the module control circuit is shown below.

5

151

Chapter 5 Theory of Operation
Multifunction Module

In addition to the +5 Volt power supply (Vcc) and ground, the module
controller uses four lines for control and communication:
• RESET, from the Earth Referenced Logic A1U305. RESET is
common to all three slots. The module controller performs a reset
when this line goes high. Reset conditions vary for each plug-in.
• SRQ, to the Earth Referenced Logic A1U305. The SRQ line is a
wired-OR line that can be driven by any plug-in. Consequently,
any module that asserts SRQ (line low), asserts this line in all
other slots and at the Earth Reference Logic.
• DATA IN, from the Floating Logic A1U205 via the opto isolator
A1U312. This line is connected in common to all three slots.
• DATA OUT, from the module controller to the Floating Logic
A1U205 via the opto isolator A1U213. This line is a wired-OR line
that can be driven by any module.
The DATA IN and DATA OUT lines are optically isolated from the
floating logic controller. These lines communicate with the Floating
Logic using an asynchronous serial bit stream.
The serial communications use an 11 bit protocol; a start bit, 8 data
bits, an attention bit, and a stop bit. The attention bit is 1 if the 8
data bits are an address/command, or 0 if the 8 data bits modify or
provide data for the previously sent command.
The module controller uses the hardwired slot-ID bits to decode the
serial bit stream address. When the address/command message
address matches the slot-ID, the plug-in is selected and responds to
the following commands. All other plug-ins will ignore the commands
until a new address/command message is received.
A 12 MHz crystal, Y101, is the clock for the module controller.
The module ID is a four bit pattern set through RP102. The Ferroelectric RAM U102 provides data storage of the calibration constants
for the analog output channels. Data in and out of U102 is serial.
8 data lines, connected to U101 port 1, are used by the digital input
and output ports. One of the data lines is used to send serial data to
the analog output channels. The totalizer edge count is controlled by
U101 P0.6 and read at U101 P3.4.
U101 enters a low-power idle mode when inactive. U101 responds when
a command is received or when a scheduled alarm scan is needed.

152

Chapter 5 Theory of Operation
Multifunction Module

Totalizer
Components in this discussion are located on the A1 circuit assembly
(34907-66501). The schematics are included in Chapter 8 starting on
page 261.
A simplified block diagram of the totalizer input is shown below.

Module Reference

5
The totalizer counts signals connected to the COUNT+ and COUNT–
inputs. Two op-amps, U108A and U108B, are used for input signal
conditioning. Comparator U109 determines the signal trigger levels
based upon the setting of the jumper at P102. With the P102 jumper
in the TTL position, the totalizer counts pulses with TTL trigger
levels. With the jumper at P102 in the AC position the trigger level
is at zero.
The GATE and GATE* input signals control when counting occurs.
If no signal is connected, the totalizer counts any changing signal on
the inputs. A TTL low on the GATE input or a TTL high on GATE*
input will halt counting.
Count edge selection is controlled from a U101 port bit (P0.6) through
the exclusive OR gate U111. When the P0.6 signal is low, the count
increments on the rising edge of the input signal. When the P0.6 signal
is high, the count increments on the falling edge of the input signal.

153

Chapter 5 Theory of Operation
Multifunction Module

Analog Output
Components in this discussion are located on the A1 circuit assembly
(34907-66501). The schematics are included in Chapter 8 starting on
page 261.
A simplified block diagram of the analog output channels is shown below.

Communication with each DAC (U503 and U504) is via three lines:
SERSTB, DACCLK, and SERDAT. Each DAC has a voltage output
of ±3 V. U505 and U506 amplify this voltage to the ±12V output.
A DC/DC converter is used to provide the ± 15V supplies to U505 and
U506. The ± 15V supplies also are used at the input of the totalizer.
U502 provides the –5 V supply used by the DACs.
A line from U101 P0.4 is used to control the output of U510. After a
reset or power-up, U510 is held in the shutdown state. U101 turns on
the DC/DC converter in response to commands from the main
controller. The main controller paces the turn on of the DC/DC
converters to ensure that if multiple modules are installed, the
backplane power supply is not pulled down by the in-rush current of
the DC/DC converters.

154

Chapter 5 Theory of Operation
Multifunction Module

Digital I/O
Components in this discussion are located on the A1 circuit assembly
(34907-66501). The schematics are included in Chapter 8 starting on
page 261.
A simplified diagram of a digital I/O channel is shown below.

Module Reference

5

Two stages of latches on the outputs and one set of latches on the
inputs provide synchronous 16 bit writes and reads of the digital ports.
For digital output, data is written to the upper and lower bytes
(U201 and U202) separately, then latched into the output latches
U203 and U204 simultaneously. On a digital input data is latched
into the input latches U105 and U106 simultaneously.
MOSFETs are used to provide the low level output, and 74HC240’s
are used to provide the high level output.
During an output low, a logic high level is applied to the gate of the
MOSFET causing it to conduct and creating a low resistance path
from the data line to ZGND. In this state the MOSFET is capable of
sinking an externally supplied current of up to 400 mA. The blocking
diodes, CR301-CR308 and CR401-CR408 prevent any current from
sinking into the 74HC240’s.
During an output high, a logic low level is applied to the gate of the
MOSFET turning it off and presenting a high resistance between the
data line and ground.

155

Chapter 5 Theory of Operation
Multifunction Module

The 74HC240’s, U205 and U206, provide the output high drive
current necessary to maintain a TTL high output level ( ≥ 2.4 Vdc)
under load.
At instrument turn-on, following a reset, and whenever the data lines
are being read, the MOSFETs are in the passive high state, and the
high output drivers are disabled. The resistor connected between the
MOSFET’s gate and ZGND holds the gate near ground potential
when the module is initially turned-on to ensure that the MOSFET is
in the passive high state.
The comparators U301, U302, U401 and U402 maintain correct
TTL high and low levels by shifting the voltages from the input to
compensate for the forward voltage drop of the blocking diode.
A reference voltage of +2.1 Vdc (TTL_REF) is applied to the inverting
input of the comparator. When the input voltage is in the range of
0 Vdc to +4.3 Vdc the blocking diode is forward biased and its forward
voltage drop is added to the applied voltage. For example, when 0 Vdc
is applied to the data line, +0.7 Vdc is present on the non-inverting
input of the comparator and the comparator output is low. When the
input signal level is above 1.4 Vdc, a voltage greater then +2.1 Vdc is
applied to the non-inverting input of the comparator causing its output
to go high. When the input signal is less than 1.4 Vdc, a voltage less
than 2.1 Vdc is applied to the comparator’s non-inverting input
causing its output to go low. This ensures an input voltage < 1.4 Vdc
is interpreted as a TTL low level and an input > 1.4 Vdc is
interpreted as a TTL high level.
The pull-up resistor (connected to the comparator’s non-inverting
input) allows external ground connections and open circuits to be
detected. When the data line is grounded, the blocking diode is
forward biased applying a +0.7 Vdc level to the comparator, a TTL
low. When the data line is allowed to float, the non-inverting input of
the comparator pulls up to +5 Vdc, a TTL high.
The blocking diode on the output is used for circuit protection.
The diode reverse biases when the applied voltage exceeds +4.3 Vdc
preventing externally supplied current from being injected into the
module’s +5V supply line.
The MOSFETs have a built in zener diode that conducts at any voltage
of approximately 75 Vdc or greater. The zener diode provides protection
from external over voltage situations including static electricity.

156

6

6

Service

Service
This chapter discusses the procedures involved for returning a failed
instrument to Keysight for service or repair. Subjects covered include
the following:
• Operating Checklist, on page 159
• Types of Service Available, on page 160
• Repackaging for Shipment, on page 161
• Cleaning, on page 161
• Electrostatic Discharge (ESD) Precautions, on page 162
• Surface Mount Repair, on page 162
• To Replace the Power-Line Fuse, on page 163
(also depicted on page 42)
• Troubleshooting Hints, on page 163
• Self-Test Procedures, on page 167
• Battery Check and Replacement, on page 172
• Disassembly, on page 174

158

Chapter 6 Service
Operating Checklist

Operating Checklist
Before returning your instrument to Keysight Technologies for service
or repair check the following items:

Is the instrument inoperative?
• Verify that the ac power cord is connected to the instrument.
• Verify that the front-panel On/Standby switch has been pushed.
• Verify that the power-line fuse is installed and not open (see page 42).
The instrument is shipped from the factory with a 500 mAT,
250 V fuse. This is the correct fuse for all line voltages.
• Verify the power-line voltage setting.
See “If the Instrument Does Not Turn On” on page 42.

Does the instrument fail self-test?
• Verify that the correct power-line voltage is selected.
See “If the Instrument Does Not Turn On” on page 42.
• Remove all input connections to the instrument.
Errors may be induced by ac signals present on the input wiring
during a self-test. Long test leads can act as an antenna causing
pick-up of ac signals.

Is the Current measurement function inoperative?

6

• Verify the input protection fuses on the 34901A Multiplexer Module.
If necessary, replace with a 1.5 A, 250 V NTD fuse.
Note: The Current input is only available on channels 21 and 22
of the 34901A module.

159

Chapter 6 Service
Types of Service Available

Types of Service Available
If your instrument or plug-in module fails during the warranty period
(within one year of original purchase), Keysight will replace the unit free of
charge. After your warranty expires, Keysight will replace the unit at a
competitive price. The replacement units are fully refurbished and are
shipped with new calibration certificates.
Note: Each replacement unit has its own serial number. The serial
number of the defective unit does not transfer to the replacement unit.
The warranty period of the replacement unit is based on the
remaining warranty of the defective 34970A.

Keysight Unit Exchange
Contact your nearest Keysight Technologies Service Center to arrange to
have your instrument replaced. In the U.S. call 800-829-4444. Select
"Option 3" followed by "Option 1."
Note: Keysight Unit Exchange applies to the 34970A mainframe only.
Plug-in modules are not supported as exchange assemblies.
When exchanging the 34970A, do not ship plug-in modules with your
instrument. Remove all plug-in modules and customer wiring before
shipping the unit to Keysight.
Note: The defective unit must be returned to Keysight before the
replacement unit is shipped to you. Additional information regarding
unit exchange will be provided when you contact Keysight.

160

Chapter 6 Service
Repackaging for Shipment

Repackaging for Shipment
If the unit is to be shipped to Keysight for service or repair, be sure to:
• Attach a tag to the unit identifying the owner and indicating the
required service or repair. Include the instrument model number
and your full serial number.
• Place the unit in its original container with appropriate packaging
material.
• Secure the container with strong tape or metal bands.
If the original shipping container is not available, place your unit in a
container which will ensure at least 4 inches of compressible
packaging material around all sides for the instrument. Use
static-free packaging materials to avoid additional damage to your
unit.

Keysight suggests that you always insure shipments.

Cleaning
Clean the outside of the instrument and plug-in modules with a soft,
lint-free, slightly dampened cloth. Do not use detergent. Disassembly
is not required or recommended for cleaning.

6

161

Chapter 6 Service
Electrostatic Discharge (ESD) Precautions

Electrostatic Discharge (ESD) Precautions
Almost all electrical components can be damaged by electrostatic
discharge (ESD) during handling. Component damage can occur at
electrostatic discharge voltages as low as 50 volts.
The following guidelines will help prevent ESD damage when
servicing the instrument or any electronic device.
• Disassemble instruments only in a static-free work area.
• Use a conductive work area to dissipate static charge.
• Use a conductive wrist strap to dissipate static charge accumulation.
• Minimize handling.
• Keep replacement parts in original static-free packaging.
• Remove all plastic, styrofoam, vinyl, paper, and other
static-generating materials from the immediate work area.
• Use only anti-static solder suckers.

WARNING

SHOCK HAZARD. Only service-trained personnel who are aware
of the hazards involved should remove the instrument covers.
To avoid electrical shock and personal injury, make sure to
disconnect the power cord from the instrument before
removing the covers.

Surface Mount Repair
Surface mount components should only be removed using soldering
irons or desoldering stations expressly designed for surface mount
components. Use of conventional solder removal equipment will almost
always result in permanent damage to the printed circuit board and
will void your Keysight factory warranty.

162

Chapter 6 Service
To Replace the Power-Line Fuse

To Replace the Power-Line Fuse
The power-line fuse is located on the rear panel of the instrument,
near the power line connector. A procedure to replace the fuse is given
on page 42. Use a 500 mAT, 250 V fuse for all power line settings.

Troubleshooting Hints
This section provides a brief check list of common failures. Before
troubleshooting or repairing the instrument, make sure the failure is
in the instrument rather than any external connections. Also make
sure that the instrument is accurately calibrated within the last year
(see page 63). The instrument’s circuits allow troubleshooting and
repair with basic equipment such as a 61⁄2-digit multimeter.

Unit is Inoperative
• Verify that the ac power cord is connected to the instrument.
• Verify that the front-panel On/Standby switch has been pushed.
• Verify that the power-line fuse is installed and not open (see page 42).
The instrument is shipped from the factory with a 500 mAT,
250 V fuse. This is the correct fuse for all line voltages.
• Verify the power-line voltage setting.
See “If the Instrument Does Not Turn On” on page 42.

6

• Remove all plug-in modules to verify that a plug-in module is not
causing the failure.

163

Chapter 6 Service
Troubleshooting Hints

Unit Reports Error 705
This error may be produced if you accidentally turn off power to the
unit during a calibration or while changing a non-volatile state of the
instrument. Recalibration or resetting the state should clear the error.
If the error persists, a hardware failure may have occurred.

Isolating to an Assembly
• Remove all plug-in modules to isolate between the instrument and
the plug-in modules.
• Listen for a beep when you press the On/Standby switch. The main
controller can operate the beeper even with a display failure.
• Listen for the fan when you press the On/Standby switch.
Fan operation indicates some operation of the main controller
and power supplies.
• Try to operate the instrument from a remote interface. If remote
operations are normal, the display should be replaced or repaired.
• Isolate the internal DMM by removing it. The instrument should
operate and pass self-test without the internal DMM installed.
Disassembly procedures start on page 174.

Unit Fails Self-Test
• Verify that the correct power-line voltage setting is selected.
• Remove all plug-in modules and run self-test again. If the
instrument does not show a failure, replace or troubleshoot
the plug-in module.
• To isolate the internal DMM, disassemble the instrument and
remove the internal DMM. Disassembly procedures start on
page 174. Run self-test again. If the self-test passes, troubleshoot
or replace the Internal DMM. If the self-test fails, troubleshoot or
replace the 34970A.

164

Chapter 6 Service
Troubleshooting Hints

Power Supplies
Verify the power supplies generated on the 34970-66501 circuit board.
The front panel filament voltage, + 5 V backplane and +5 V fan are
switched by the On/Standby switch. All other power supplies operate
whenever the AC power cord is connected.
Warning
• Exposed Mains
• Do Not Touch

To check the power supplies, remove the instrument cover as shown
on page 174. The power supplies can be checked from the bottom of
the instrument as shown below. Be sure to use the correct ground
point when checking the supplies.
6 Vrms filament

+5 V Earth Referenced

–18 V float

3 V battery

Ground Float

–
+

+18 V float
+5 V float
Chassis
Earth Reference

6

Continued on the next page...

165

Chapter 6 Service
Troubleshooting Hints

Power Supplies (continued)
The A1 power supplies are tabulated below.
Power Supply

Minimum

Maximum

Switched

+5 Earth Ref.

4.75 V

5.25 V

No

+5 Backplane and Fan

4.75 V

5.25 V

Yes

+5 Floating

4.75 V

5.25 V

No

+18 Floating

17.6 V

19.9 V

No

-18 Floating

-19.0 V

-16.8 V

No

6 Vrms Filament

Yes

• Check that the input to the supply voltage regulator is at least
1 V greater than its output.
• Circuit failures can cause heavy supply loads which may pull down
the regulator output voltage.
• Always check that the power supplies are free of ac oscillations
using an oscilloscope.
• All plug-in modules use the +5 V backplane supply. Some plug-in
modules generate their own local power supplies.

166

Chapter 6 Service
Self-Test Procedures

Self-Test Procedures
Power-On Self-Test
Each time the instrument is powered on, a small set of self-tests are
performed. These tests check that the minimum set of logic and
measurement hardware are functioning properly. Any plug-in
modules installed are verified for two-way communication with the
main controller.

Complete Self-Test
Hold down any front panel key for 5 seconds while turning on the
power to perform a complete self-test. The instrument beeps when
the test starts. If all self-tests pass the display shows PASS for
five seconds and the instrument returns to the last measurement
function.

Plug-in Module Self-Test
No user self-test exists for the plug-in modules. The plug-in modules
perform their own self-test when power is applied. Additionally, the
mainframe checks two-way communication with all plug-in modules
at power on.
Each plug-in module also performs error checking at regular
intervals during operation and any errors detected are reported via
the status system to the main controller.

6

Note: The following pages contain a subset of the 34970A error
messages. Refer to Chapter 6 in the 34970A User’s Guide (p/n
34970-90003) for the complete error message listing.

167

Chapter 6 Service
Self-Test Procedures

Self-Tests
A complete self-test performs the following tests. A failing test is
indicated by the test number and description in the display.
601

Front panel not responding The main CPU A1U205 attempts to
establish serial communications with the front panel processor A2U1.
During this test, A2U1 turns on all display segments. Communication
must function in both directions for this test to pass. If this error
is detected during power-up self-test, the instrument will beep.
This error is only readable from the remote interface.

602

RAM read/write failed This test writes and reads a 55η and AAη
checkerboard pattern to each address of RAM. Any incorrect
readback will cause a test failure. This error is only readable from the
remote interface.

603

A / D sync stuck The main CPU issues an A/ D sync pulse to
A1U209 and A1U205 to latch the value in the ADC slope counters.
A failure is detected when a sync interrupt is not recognized and a
subsequent time-out occurs.

604

A / D slope convergence failed The input amplifier is configured
to the measure zero (MZ) state in the 10 V range. This test checks
whether the ADC integrator produces nominally the same number of
positive and negative slope decisions (± 10%) during a 20 ms interval.

605

Cannot calibrate rundown gain This test checks the nominal
gain between the integrating ADC and the A1U205 on-chip ADC.
This error is reported if the procedure can not run to completion due
to a hardware failure.

606

Rundown gain out of range This test checks the nominal gain
between the integrating ADC and the A1U205 on-chip ADC. The
nominal gain is check to ± 10% tolerance.

607

Rundown too noisy This test checks the gain repeatability
between the integrating ADC and the A1U205 on-chip ADC. The gain
test (606) is performed eight times. Gain noise must be less than ± 64
LSB’s of the A1U205 on-chip ADC.

168

Chapter 6 Service
Self-Test Procedures

608

Serial configuration readback failed This test re-sends the last
9 byte serial configuration data to all the serial path. The data is
then clocked back into A1U209 and compared against the original 9
bytes sent. A failure occurs if the data do not match.

609

DC gain x1 failed This test configures for the 10 V range. The dc
amplifier gain is set to X1. The measure customer (MC) input is
connected to the internal TSENSE source which produces 0.6 volts.
A 20 ms ADC measurement is performed and checked against a limit
of 0.6 V ± 0.3 V.

610

DC gain x10 failed This test configures for the 1 V range. The dc
amplifier gain is set to X10. The measure customer (MC) input is
connected to the internal TSENSE source which produces 0.6 volts.
A 20 ms ADC measurement is performed and checked against a limit
of 0.6 V ± 0.3 V.

611

DC gain x100 failed This test configures for the 100 mV range.
The dc amplifier gain is set to X100. The measure customer (MC)
input is connected to the internal TSENSE source which produces
0.6 volts. A 20 ms ADC measurement is performed and checked for
a + overload response.

612

Ohms 500 nA source failed This test configures to the 10 V dc
range with the internal 10 M 100:1 divider A4U102 connected across
the input. the 500 nA Ohms current source is connected to produce a
nominal 5 V signal. A 20 ms ADC measurement is performed and the
result is checked against a limit of 5 V ± 1 V.

613

Ohms 5 µA source failed This test configures the 10 V range with
the internal 10 M 100:1 divider A4U102 connected across the input.
The 5 µA current source is connected. The compliance limit of the
current source is measured. A 20 ms ADC measurement is performed
and the result is checked against a limit of 7.5 V ± 3 V.

614

6

DC 300V zero failed This test configures the 300 V dc range with
no input applied. A 20 ms ADC measurement is performed and the
result is checked against a limit of 0V ± 5 mV.

169

Chapter 6 Service
Self-Test Procedures

615

Ohms 10 µA source failed This test configures the 10 V range with
the internal internal 10 M 100:1 divider A4U102 connected across the
input. The 10 µA current source is connected. A 20 ms ADC
measurement is performed and the result is checked against a limit
of 7.5 V ± 3 V.

616

DC current sense failed This test configures the 1 A dc rage and
function. A 20 ms ADC measurement is performed and the result is
checked against a limit of 0 A ± 5 A. This test confirms that the dc
current sense path is functional.

617

Ohms 100 µA source failed This test configures the 10 V range
with the internal 10 M 100:1 divider A4U102 connected across the
input. The 100 µA current source is connected. The compliance limit
of the current source is measured. A 20 ms ADC measurement is
performed and the result is checked against a limit of 5 V ± 1 V.

618

DC high voltage attenuator This test configures to the 300 Vdc
range. the 500 nA ohms current source is connected to produce a
nominal 5 V signal. A 20 ms ADC measurement is performed and the
result is checked against a limit of –10 mV to 70 mV at the output of
the rms-to-dc converter.

619

Ohms 1 mA source failed This test configures the 10 V range with
the internal 1 0 M 100:1 divider A4U102 connected across the input.
The 1 mA current source is connected. A 20 ms ADC measurement is
performed and the result is checked against a limit of 7 V ± 3.5 V.

620

AC rms zero failed This test configures to the 100 mV ac range
with the ac input grounded through A4K103. The internal residual
noise of the ac section is measured and checked against a limit of
–10 mV to 70 mV at the output of the rms-to-dc converter.

621

AC rms full scale failed This test configures for the 100 mV ac
range. The 1 mA ohms current source is switched on the charge the
ac input capacitor A4C301. This produces a pulse on the output of the
rms-to-dc converter which is sampled 100 ms after the current is
applied. A 20 ms A/D measurement is performed and checked against
a limit of 10 V ± 8.5 V into the ADC.

170

Chapter 6 Service
Self-Test Procedures

622

Frequency counter failed This test configures for the 100 mV ac
range. This test immediately follows test 621. With A4C301 holding
charge from test 621 the ac input is now switched to ground through
A4K103. This produces a positive pulse on the input to the frequency
comparator A4U310. While C301 discharges, the ENAB FREQ bit is
toggled four times to produce a frequency input to the counter logic in
A1U205. A failure occurs if the counter can not measure the
frequency input.

623

Cannot calibrate precharge This test configures to the 100 V dc
range with no input. The ADC is configured for 200 ms measurements.
The A1U205 pulse width modulated (PWM) DAC output (C224) is set
to about 4 volts. A reading is taken in with A4U101 in the MC state.
A second reading is taken in the PRE state. The precharge amplifier
voltage offset is calculated. The A1U205 DAC output is set to about
1.5 volts and the precharge offset is measured again. The gain of the
offset adjustment is calculated. This test assures a precharge
amplifier offset is achievable.

624

Unable to sense line frequency This test checks that the
LSENSE logic input to A1U205 is toggling. If no logic input is
detected, the meter will assume a 50 Hz line operation for all future
measurements.

625

I/O processor did not respond This test checks that
communications can be established between A1U205 and A1U305
through the optically isolated (A1U213 and A1U214) serial data link.
Failure to establish communication in either direction will generate
an error. If this condition is detected at power-on self-test, the
instrument will beep and the error annunciator will be on.

626

I/O processor failed self-test A failure occurred when the earth
referenced processor, AU305, executed an internal RAM test.

6

171

Chapter 6 Service
Battery Check and Replacement

Battery Check and Replacement
The internal battery, A1BT101, provides power to the internal
real-time clock, stored states, and reading storage memory whenever
ac line power is removed.
Note: The internal battery state does not affect the calibration memory.
The battery has an expected life of approximately 4 years. Battery
life will be reduced if the instrument is stored for prolonged periods
at temperatures above 40 °C with the ac power removed. The battery
is not used whenever the ac line power is applied to the instrument.
The internal battery may be monitored to verify operation as
described below. A low battery will typically give errors when ac line
power is removed and then re-applied. Any of the following errors
may indicate a low battery:
201, “Memory lost: stored state”
202, “Memory lost: power-on state”
203, “Memory lost: stored readings”
204, “Memory lost: time and date”

3 V battery

Properly dispose
of lithium battery.

172

Chapter 6 Service
Battery Check and Replacement

To Verify the Battery
1

Remove AC line power (this also provides a load on A1BT101).

2

Remove the cover (see page 174).

3

Measure the battery voltage as shown. Replace the battery if
the voltage is below 2.7 V.

Battery –

Battery +

6
To Replace the Battery
1

Remove AC line power.

2

Remove the cover (see page 174). If installed, remove the
Internal DMM (A4) assembly (see page 176).

3

Turn the instrument over and unsolder the three battery terminals
from the bottom of the circuit board. Use proper through-hole
soldering techniques and equipment. Remove the battery and
dispose of properly.

4

Install, solder, and verify the new battery.

173

Chapter 6 Service
Disassembly

Disassembly
The following tools are recommended for disassembly.
• T15 Torx® driver (all screws)
• 11 mm nut driver (front-panel disassembly)
• 5 mm nut driver (rear-panel connectors)
Tighten the fan screws to a maximum of 6 in/lbs (0.68 newton/meter).
WARNING

SHOCK HAZARD. Only service-trained personnel who are aware
of the hazards involved should remove the instrument covers.
Dangerous voltages may be encountered with the instrument
covers removed.

CAUTION

To prevent damage to the fan, do not over tighten the fan screws.

Torx® is a registered trademark of Camcor/Textron, Inc.

174

Chapter 6 Service
Disassembly

General Disassembly

1

2

3

4

6

175

Chapter 6 Service
Disassembly

Internal DMM Disassembly

1

2

3

176

Chapter 6 Service
Disassembly

Front-Panel Disassembly

1

2

3

6

Maximum Torque:
6 in/lbs (0.68 n/m)

Note: When reassembling the front panel, be sure to route the front-panel cable as shown above.
Do not allow the front-panel cable to touch the digital ribbon cable.
177

Chapter 6 Service
Disassembly

Additional Chassis Disassembly

1

2

178

Chapter 6 Service
Disassembly

Plug-In Module Disassembly

Needle-nose
Pliers

6

179

180

7

7

Replaceable Parts

Replaceable Parts
This chapter contains information ordering replacement parts for
your instrument. The parts lists are divided into the following groups.
•
•
•
•
•

34970A Mainframe, on page 183
34970-66501 Main PC Assembly (A1), on page 184
34970-66502 Front-Panel and Keyboard PC Assembly (A2), on page 189
34970-66503 Backplane PC Assembly (A3), on page 190
34970-66504 Internal DMM PC Assembly (A4), on page 191

•
•
•
•
•
•
•

34901A 20-Channel Multiplexer, on page 196
34902A 16-Channel Multiplexer, on page 200
34903A 20-Channel Actuator, on page 202
34904A 4x8 Matrix, on page 204
34905A/34906A RF Multiplexer, on page 207
34907A Multifunction Module, on page 209
34908A 40-Channel Multiplexer, on page 213

• Manufacturer’s List, on page 216
Parts are listed in alphanumeric order according to their schematic
reference designators. The parts lists include a brief description of the part
with applicable Keysight part numbers and manufacturer part number.

To Order Replaceable Parts
You can order replaceable parts from Keysight using the Keysight part
number or directly from the manufacturer using the manufacturer’s
part number. Note that not all parts listed in this chapter are available
as field-replaceable parts. To order replaceable parts from Keysight, do
the following:
1 Contact your nearest Keysight Sales Office or Service Center.
2 Identify the parts by the part number shown in the replaceable
parts list. Note that not all parts are directly available from Keysight;
you may have to order certain parts from the specified manufacturer.
3 Provide the instrument model number and serial number.

182

Chapter 7 Replaceable Parts
34970A Mainframe

34970A Mainframe
Reference
Designator
A1
A2
A3
A4
CBL1
CBL2
CBL3
CVR1

Part
Number
34970-66501
34970-66502
34970-66503
34970-66504
34970-80010
34970-61606
RS232-61601
8120-1378
34970-84101

1
1
1
1
1
1
1
1
1

PCA-DIGITAL BD
PCA-DISPLAY BD
PCA-BACKPLANE BD
PCA-DMM BD
Internal DMM Field Kit
CABLE, K-TYPE TC, SCRWDRVR
CABLE, RS232, 9 PIN
CBL-U.S.
COVER-SHEET METAL

Mfr
Code
02362
02362
02362
02362
02362
02362
02362
04940
02361

FRM1

34970-80101

1

CHASSIS

02361

34970-80101

HDW1
HDW2

0535-0154
3050-1941

1
1

NUT HEX 11MM X2T
WASHER-FL NM 7/16 IN .353-IN-ID

11239
05227

37689
.593+-005X.353+-005X.032+-003

MNL1
MP1
MP2
MP3
MP4
MP5
MP6
MP7
MP8
MP9
MP10
MP11
MP12

34970-90101
34401-45011
34401-86010
34970-00101
34970-00102
34970-40201
34970-44111
34970-49321
34970-68501
34970-86201
34970-87401
34970-88001
34970-88301

1
1
1
1
1
1
2
1
1
1
1
1
1

MANUAL SET
HANDLE-FRONT
KIT-BUMPERS/COVER
CARD CAGE, LEFT
CARD CAGE, RIGHT
FRNT PANEL ASSY
COVER PLATE, PLASTIC
WINDOW/FRONT
FAN
PWR MOD W/FUSE
KNOB
KEYPAD
BEZEL-REAR, MLD

02362
02362
02362
02362
02362
02362
02362
02362
02362
02362
02362
02362
02362

34970-90101
34401-45011
34401-86010
34970-00101
34970-00102
34970-40201
34970-44111
34970-49321
34970-68501
34970-86201
34970-87401
34970-88001
34970-88301

SCW1-SCW7
SCW8-SCW9
SCW10
SHD1
SHD2
SHD3

0515-0433
0624-0751
0624-0078
34970-00601
34970-00602
34970-00603

7
2
1
1
1
1

SCRPHM4.0X08TXSC
SCR 6-19X1/2TORX
GROUND SCREW 6-32 .375-IN-LG POZI
SHIELD-XFMR
SHIELD-AC LINE
SHIELD-DMM

02361
05610
05525
02361
02361
02362

0515-0433
225-23290-890-04
0624-0078
34970-00601
34970-00602
34970-00603

T1

9100-5608

1

XFMR-PWR 100/120/220/240V

02859

14-7522

Qty

Part Description

Mfr Part Number
34970-66501
34970-66502
34970-66503
34970-66504
34970-80010
34970-61606
RS232-61601
07913-008GY
34970-84101

7

183

Chapter 7 Replaceable Parts
34970-66501 Main PC Assembly (A1)

34970-66501 Main PC Assembly (A1)
Reference
Designator
BT101

Part
Number
1420-0860

C101
C102
C103
C104
C105-C106
C107
C108
C109
C110
C112-C116
C121
C132
C151
C160
C180-C182
C181
C183
C201
C204-C205
C209
C212-C214
C218
C219
C220
C221
C222-C223
C224
C270-C272
C290-C292
C301-C312
C313
C314
C315
C316
C317-C320
C330-C331

0180-4435
0180-4558
0160-7798
0180-4435
0180-4116
0180-4433
0180-3751
0180-4433
0180-3751
0160-5945
0180-4435
0160-7798
0180-4116
0160-7798
0160-7798
0160-8367
0160-5947
0160-7798
0160-7798
0160-7798
0160-7798
0160-5945
0160-7798
0180-3744
0160-5945
0160-5957
0180-4228
0160-5947
0160-7798
0160-7798
0160-5957
0160-5946
0160-5961
0160-5957
0180-4287
0160-5947

1

BATTERY 3V 850A-HR LI MANGANESE DIOXIDE

Mfr
Code
07371

3
1
39

CAP-FXD 2200uF +-20% 25 V AL-ELCTLT
CAP-FXD 33uF +-20% 20 V TA
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 2200uF +-20% 25 V AL-ELCTLT
CAP-FXD 22uF +-20% 20 V TA
CAP-FXD 1000uF +-20% 50 V AL-ELCTLT
CAP-FXD 1uF +-20% 35 V TA
CAP-FXD 1000uF +-20% 50 V AL-ELCTLT
CAP-FXD 1uF +-20% 35 V TA
CAP-FXD 0.01uF +-10% 50 V CER X7R
CAP-FXD 2200uF +-20% 25 V AL-ELCTLT
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 22uF +-20% 20 V TA
CAP 0.1UF 50V 10% X7R 0805
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 1uF +-10% 10 V CER
CAP-FXD 1000pF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP 0.1UF 50V 10% X7R 0805
CAP 0.1UF 50V 10% X7R 0805
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 0.01uF +-10% 50 V CER X7R
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 4.7uF +-20% 10 V TA
CAP-FXD 0.01uF +-10% 50 V CER X7R
CAP-FXD 47pF +-5% 50 V CER C0G
CAP-FXD 47uF 10 V TA
CAP-FXD 1000pF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 47pF +-5% 50 V CER C0G
CAP-FXD 3300pF 50 V
FIXED CAPACITOR; 22PF 50 VOLTS
CAP-FXD 47pF +-5% 50 V CER C0G
CAP-FXD 10uF +-20% 35 V TA
CAP-FXD 1000pF 50 V

06360
12340
02010
06360
00039
06360
00039
06360
00039
02010
06360
02010
00039
02010
02010
06352
02010
02010
02010
02010
02010
02010
02010
00039
02010
03292
05524
02010
02010
02010
03292
02010
02010
03292
05524
02010

Qty

3
2
2

9

1
6

1
4
1

1
1
4

184

Part Description

Mfr Part Number
CR14250SE-FT1
KME25VB222M16X25MCV
T491D336M020AS
08055C104KAT_A
KME25VB222M16X25MCV
NRD226M20R12
KME50VB102M16X25MCV
NRS105M35R8
KME50VB102M16X25MCV
NRS105M35R8
08055C103KATA
KME25VB222M16X25MCV
08055C104KAT_A
NRD226M20R12
08055C104KAT_A
08055C104KAT_A
C2012X5R1A105K
08055C102KATA
08055C104KAT_A
08055C104KAT_A
08055C104KAT_A
08055C104KAT_A
08055C103KATA
08055C104KAT_A
NRS475M10R8
08055C103KATA
0160-5957
293D476X00101D2W
08055C102KATA
08055C104KAT_A
08055C104KAT_A
0160-5957
08051C332KATA
08055A220JATA
0160-5957
293D106X0035D2W
08055C102KATA

Chapter 7 Replaceable Parts
34970-66501 Main PC Assembly (A1)

Reference
Designator
C350-C351
C370
C373
C401-C409
C410

Part
Number
0160-7798
0160-5947
0160-5945
0160-7798
0160-5945

CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 1000pF 50 V
CAP-FXD 0.01uF +-10% 50 V CER X7R
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 0.01uF +-10% 50 V CER X7R

Mfr
Code
02010
02010
02010
02010
02010

08055C104KAT_A
08055C102KATA
08055C103KATA
08055C104KAT_A
08055C103KATA

CR101-CR104
CR105
CR106-CR107
CR108
CR109
CR110
CR183
CR201-CR202
CR301-CR310

1901-1375
1906-0407
1902-1609
1902-1512
1906-0407
1906-0291
1906-0291
1906-0291
1906-0291

DIODE, 3A, 400V, 75NS,NON-PHOTOSENSITIVE
DIODE-FW BRDG 400V 1A
DIODE-ZNR 6.2V 5% PD=1.5W IR=5UA
DIODE-ZNR 7.5V 5% TO-236 (SOT-23)
DIODE-FW BRDG 400V 1A
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 70V 100MA T0-236AA

02037
12810
02037
02910
12810
02910
02910
02910
02910

MURS340
DB104S
1SMB5920B
BZX84C7V5
DB104S
BAV99
BAV99
BAV99
BAV99

E102
E103
E105-E106
E120-E124
E201
E202-E203
E204
E206-E208
E301
E315-E318

9170-1584
1205-0686
1205-0686
9170-1584
9170-1584
9170-1506
9170-1584
9170-1584
9170-1663
9170-1584

CORE-SHLD BEAD
HEAT SINK SGL TO-220-CS
HEAT SINK SGL TO-220-CS
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-MAGNETIC
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHIELDING BEAD
CORE-SHLD BEAD

09808
07179
07179
09808
09808
06352
09808
09808
11702
09808

25Z0805-0SR
576802B04000
576802B04000
25Z0805-0SR
25Z0805-0SR
HF50ACB201209
25Z0805-0SR
25Z0805-0SR
FBM4532HM132
25Z0805-0SR

J201
J202
J302

1252-4484
1252-8542
1252-2161

1
1
1

CONN-POST TYPE 2.0-PIN-SPCG 12-CONT
CONN FRCC VERT MALE 26PIN
CONN-RECT MICRORBN 24-CKT 24-CONT

03418
04726
01380

52007-1210
2526-6302
554923-2

MAJ302
MAU101
MBJ302
MCJ302
MDJ302

2190-0577
1205-1178
2190-0577
0380-0643
0380-0643

2
1

WASHER- NO. 10 .194-IN-ID .294-IN-OD
HEAT SINK
WASHER- NO. 10 .194-IN-ID .294-IN-OD
STANDOFF-HEX .255-IN-LG 6-32-THD
STANDOFF-HEX .255-IN-LG 6-32-THD

02361
02361
02361
02361
02361

2190-0577
1205-1178
2190-0577
0380-0643
0380-0643

P101
P102
P110

1252-4487
1252-4488
1251-5066

1
1
1

CONN-POST TYPE .156-PIN-SPCG 3-CONT
CONN-POST TYPE .156-PIN-SPCG 8-CONT
CONN-POST TYPE 2.5-PIN-SPCG-MTG-END

03418
03418
03418

26-64-4030
26-64-4080
22-04-1021

Qty

4
2
2
1
12

15
3

2

1

2

Part Description

Mfr Part Number

7

185

Chapter 7 Replaceable Parts
34970-66501 Main PC Assembly (A1)

Reference
Designator
P201
P302
P303

Part
Number
1251-0600
34970-61601
34970-61602

1
1
1

Mfr
Code
CONNECTOR-SGL CONT PIN 1.14-MM-BSC-SZ SQ 01136
CABLE, DGTL-BKPLN
03418
CABLE, RS232-DGTL
04726

928-196-004140
22-43-2060
87920-1000T

Q101
Q102
Q110
Q120

1855-1101
1854-1037
1855-0926
1853-0724

1
1
1
1

TRANSISTOR-MOSFET DUAL P-CHAN E-MODE SI
TRANSISTOR NPN SI TO-236AA PD=350MW
FET NMOS 2X S0BN 30V 1.5A R MMDF1N05
TRANSISTOR PNP SI TO-261AA (SOT-223)

02037
02237
02037
06121

MMDF2P02E
MMBT3904
MMDF1NO5E
PZT2907A

R101
R102
R103
R104
R105-R106
R107
R108
R109
R110
R111
R112
R114-R115
R118-R120
R130-R131
R132
R133
R183
R201
R202
R203
R206
R208-R209
R210
R211
R212
R213
R214
R215-R216
R217
R219-R220
R221

0699-2643
0699-2990
0699-2643
0699-2990
0699-3051
0699-3060
0699-3740
0699-2643
0699-3060
0699-3040
0699-2643
0699-3051
0699-3053
0699-3034
0699-3053
0699-2643
0699-3067
0699-3053
0699-2965
0699-3034
0699-3058
0699-3051
0699-3001
0699-3819
0699-3058
0699-3053
0699-2983
0699-3058
0699-3034
0699-3034
0699-3051

6
2

RESISTOR 0 +-5% .1W TKF TC=0+-300
RESISTOR 42.2K +-1% .1W TKF TC=0+-100
RESISTOR 0 +-5% .1W TKF TC=0+-300
RESISTOR 42.2K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 237 +-1% .1W TKF TC=0+-100
RESISTOR 3.32K +-1% .1W TKF TC=0+-100
RESISTOR 0 +-5% .1W TKF TC=0+-300
RESISTOR 237 +-1% .1W TKF TC=0+-100
RESISTOR 3.16K +-1% .1W TKF TC=0+-100
RESISTOR 0 +-5% .1W TKF TC=0+-300
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 0 +-5% .1W TKF TC=0+-300
RESISTOR 14.7K +-1pct .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 46.4K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 215K +-1% .1W TKF TC=0+-100
RESISTOR 10M +-5% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 5.62K +-1% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100

06337
06337
06337
06337
06337
06337
00746
06337
06337
02995
06337
06337
02995
06337
02995
06337
05524
02995
06337
06337
06337
06337
06337
05524
06337
02995
06337
06337
06337
06337
06337

9C08052A0R00JL
9C08052A4222FKR
9C08052A0R00JL
9C08052A4222FKR
9C08052A1002FKR
9C08052A2370FKR
MCR10-F-X-3321
9C08052A0R00JL
9C08052A2370FKR
9C08052A3161FKR
9C08052A0R00JL
9C08052A1002FKR
9C08052A1003FKR
9C08052A1001FKR
9C08052A1003FKR
9C08052A0R00JL
CRCW08051472F
9C08052A1003FKR
9C08052A4642FKR
9C08052A1001FKR
9C08052A1000FKR
9C08052A1002FKR
9C08052A2153FKR
CRCW08051005J
9C08052A1000FKR
9C08052A1003FKR
9C08052A5621FKR
9C08052A1000FKR
9C08052A1001FKR
9C08052A1001FKR
9C08052A1002FKR

Qty

9
2
1

1

31
17

1
13
19
2
1

3

186

Part Description

Mfr Part Number

Chapter 7 Replaceable Parts
34970-66501 Main PC Assembly (A1)

Reference
Designator
R222
R251
R252-R254
R255-R259
R260
R261
R262
R270
R271-R273
R275
R277
R301-R302
R303
R304
R305-R309
R310
R311
R312
R313
R314
R315
R330-R331
R340
R350
R351-R358
R360-R362
R370
R371-R372
R373
R375
R380
R401
R403-R423

Part
Number
0699-3034
0699-3058
0699-3034
0699-3058
0699-3053
0699-2965
0699-3053
0699-3001
0699-2977
0699-2983
0699-2983
0699-3034
0699-3053
0699-3034
0699-3058
0699-3034
0699-3050
0699-3034
0699-3077
0699-3035
0699-3034
0699-2977
0699-2965
0699-3058
0699-2965
0699-3058
0699-2977
0699-2965
0699-3051
0699-3051
0699-3034
0699-2643
0699-3053

U101
U102
U103
U104
U105
U106

1826-2794
1826-2264
1826-1597
1826-3044
1826-0393
1826-0527

Qty

6

1
1
1

1
1
1
1
1
1

RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 46.4K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 215K +-1pct .1W TKF TC=0+-100
RESISTOR 681 +-1% .1W TKF TC=0+-100
RESISTOR 5.62K +-1% .1W TKF TC=0+-100
RESISTOR 5.62K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1M +-1% .1W TKF TC=0+-100
RESISTOR 1.47K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 681 +-1% .1W TKF TC=0+-100
RESISTOR 46.4K +-1% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 46.4K +-1% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 681 +-1% .1W TKF TC=0+-100
RESISTOR 46.4K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 0 +-5% .1W TKF TC=0+-300
RESISTOR 100K +-1% .1W TKF TC=0+-100

Mfr
Code
06337
06337
06337
06337
02995
06337
02995
06337
06337
06337
06337
06337
02995
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
02995

9C08052A1001FKR
9C08052A1000FKR
9C08052A1001FKR
9C08052A1000FKR
9C08052A1003FKR
9C08052A4642FKR
9C08052A1003FKR
9C08052A2153FKR
9C08052A6810FKR
9C08052A5621FKR
9C08052A5621FKR
9C08052A1001FKR
9C08052A1003FKR
9C08052A1001FKR
9C08052A1000FKR
9C08052A1001FKR
9C08052A9091FKR
9C08052A1001FKR
9C08052A1004FKR
9C08052A1471FKR
9C08052A1001FKR
9C08052A6810FKR
9C08052A4642FKR
9C08052A1000FKR
9C08052A4642FKR
9C08052A1000FKR
9C08052A6810FKR
9C08052A4642FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1001FKR
9C08052A0R00JL
9C08052A1003FKR

IC V RGLTR-FXD-POS 4.85/5.15V 3-TO-220
IC PWR MGT-UND-V-SEN 8 PINS P-SOIC PKG
IC PWR MGT-V-REG-FXD-POS 4.85/5.15V
IC PWR MGT-VS-SUPVR/CONT 16 PINS P-SOIC
IC PWR MGT-V-REG-ADJ-POS 1.2/37V 3 PINS
IC PWR MGT-V-REG-ADJ-NEG 1.2/37V 3 PINS

03406
02037
03406
03285
01698
03406

LM2490CT-5.0-LB01
MC34064D-5
LM2940CT-5.0
ADM691AR
LM317KC
LM337T

Part Description

Mfr Part Number

7

187

Chapter 7 Replaceable Parts
34970-66501 Main PC Assembly (A1)

Reference
Designator
U107
U150
U201
U204
U205
U209
U212
U213-U214
U215
U220
U301
U302
U303
U304
U305
U306
U307
U308
U309
U310
U311
U312
U320
U401
U402-U405
U410

Part
Number
1826-1572
1826-2817
1818-6821
1813-0827
1821-1479
1821-2271
1820-5937
1990-1552
9164-0173
1821-3433
0410-4009
1821-0055
1990-1552
1820-7312
34970-88803
1820-7312
1820-6863
1820-6823
1822-0639
1820-6175
1820-6176
1990-1552
1820-7312
34970-88807
1818-8796
1818-5917

XU305
XU401

1200-1592
1200-1592

Y201
Y301

0410-2153
0410-2622

IC COMPARATOR PRCN DUAL 8 PIN PLSTC-SOIC
IC PWR MGT-V-REF-FXD 4.975/5.025V 3 PINS
FRAM SERIAL 4K FMZ4C04-S
CLK-OSC-XTAL STD 12.000-MHZ 0.01%
IC-80C196
ASIC 0.8U GATE ARRAY PERIPH/MEM CONTROL
IC FF CMOS/AC D-TYPE POS-EDGE-TRIG
OPTO-ISOLATOR LED-IC GATE IF=10MA-MAX
ALARM-AUDIBLE PIEZO ALARM PIN TYPE; 25V
7S14-SINGLE GATE, INVERTER, SCHMIT TRIGTNY
CERO-RES 12MHZ +1-0.8%
IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP
OPTO-ISOLATOR LED-IC GATE IF=10MA-MAX
IC SCHMITT-TRIG CMOS/ACT INV HEX
PROG PART LOWER LEVEL 1821-1876
IC SCHMITT-TRIG CMOS/ACT INV HEX
IC-UART WITH FIFO
IC INTERFACE DRVR/RCVR CMOS TPL -888-BIT
IC HPIB CONTROLLER
IC-INTERFACE XCVR BIPOLAR BUS OCTL
IC-INTERFACE XCVR BIPOLAR BUS OCTL
OPTO-ISOLATOR LED-IC GATE IF=10MA-MAX
IC SCHMITT-TRIG CMOS/ACT INV HEX
OTP - PROG 1818-5589 (Rev. 13)
IC 1M-BIT SRAM 70-NS CMOS 32-SOP
IC 256K-BIT SRAM 70-NS CMOS

Mfr
Code
02910
03406
14543
12768
03811
03677
03406
01542
09939
03406
00830
02037
01542
02037
02362
02037
03406
02037
03677
01698
01698
01542
02037
02362
00039
06916

2

SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD
SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD

01380
01380

3-822275-1
3-822275-1

1
1

CRYSTAL-QUARTZ 32.768 KHZ
CRYSTAL-QUARTZ 3.6864 MHZ

10421
09235

MC-405, 32.768K
FPX0368-20

Qty
1
1
1
1
1
1
1
4
1
1
1
1
3
1
1
1
1
1
1

1
4
1

188

Part Description

Mfr Part Number
LM393D
LM4040CIM3-5.0
FM24C04-S
SG-615P-12.000MC
N80C196KB16
6559.024
74AC74SC
HCPL-2211-300
PKM22EPP-4002S
NC7S14M5
PBRC-12.0BRN07
MC74ACT132D
HCPL-2211-300
MC74ACT14DR2
34970-88803
MC74ACT14DR2
PC16550DV
MC145407DWR2
14063-501
SN75ALS162DW
SN75ALS160DW
HCPL-2211-300
MC74ACT14DR2
34970-88807
UPD3100AGW-70LL
CXK58257AM-70LL
(UNPRGMD)

Chapter 7 Replaceable Parts
34970-66502 Front-Panel and Keyboard PC Assembly (A2)

34970-66502 Front-Panel and Keyboard PC Assembly (A2)
Reference
Designator
C1
C2
C3-C13
CR1
CR2

Part
Number
0180-3751
0180-4287
0160-7798
1902-1542
34970-89301

1
1
11
1
1

Mfr
Code
CAP-FXD 1uF +-20% 35 V TA
00039
CAP-FXD 10uF +-20% 35 V TA
05524
CAP 0.1UF 50V 10% X7R 0805
02010
DIODE-ZNR 6.2V 5% TO-236 (SOT-23)
02037
INDICATOR PANEL, VACUM FLOURESCENT DSPLY 11908

E1
E2

34970-00604
9170-1506

1
1

SHIELD, ESD TEMP PART FOR ASSY34970-66502
CORE-MAGNETIC

02361
06352

34970-00604
HF50ACB201209

J1

34970-61612

1

CABLE, DISPLAY

02632

34970-61612

R1
R2
R3-R4
R5-R7
R8-R10
R11

0699-3070
0699-3039
0699-3053
0699-3051
0699-3058
0699-3051

1
1
2
4
3

RESISTOR 26.1K +-1% .1W TKF TC=0+-100
RESISTOR 2.61K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 100 +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100

06337
06337
02995
06337
06337
06337

9C08052A2612FKR
9C08052A2611FKR
9C08052A1003FKR
9C08052A1002FKR
9C08052A1000FKR
9C08052A1002FKR

U1
U2
U3
U4-U5
U6
U7
U8

34970-88812
1826-1734
0410-4009
1820-5330
1826-1528
1826-2264
0960-0961

1
1
1
2
1
1
1

PGM’D 1820-8905 8 BIT MCU W/4K EPROM
IC PWR MGT-V-REG-FXD-POS 4.8/5.2V 3 PINS
CERO-RES 12MHZ +1-0.8%
IC-INTERFACE DRVR BIPOLAR DISPLAY
IC COMPARATOR LP QUAD 14 PIN PLSTC-SOIC
IC 34064
ROTARY ENCODER 24POS TH-VERT

02632
02037
00830
01698
02037
02037
03744

34970-88812
MC78M05CDT
PBRC-12.0BRN07
SN75518FN
LM339D
MC34064D-5
ECLOJ-C24-SE002

Qty

Part Description

Mfr Part Number
NRS105M35R8
293D106X0035D2W
08055C104KAT_A
BZX84C6V2
34970-89301

7

189

Chapter 7 Replaceable Parts
34970-66503 Backplane PC Assembly (A3)

34970-66503 Backplane PC Assembly (A3)
Reference
Designator
C109

Part
Number
0160-7438

1

CAP-FXD 0.01uF +-10% 500 V CER X7R

Mfr
Code
02010

E101-E102

1970-0100

2

TUBE-ELECTRON SURGE V PTCTR

11484

1970-0100

J1

1400-0977

1

CLIP BAT

05535

209

L101-L102

9140-1194

2

INDUCTOR 10NH +-10% 2.8W-MMX3.4LG-MM 02366

KL32TE010K

P101-P103
P104
P105
P106

1252-8025
1252-3442
1252-3441
34970-61611

3
1
1
1

CONN DIN VERT MALE 48PIN
CONN-POST TYPE .100-PIN-SPCG 6-CONT
CONN DIS RA M SPIN SMC
BACKPLANE CABLE

02010
03418
03418
00003

16-8477-048-001-025
705-55-0075
705-55-0074
34970-61611

R101
R160
RV101-RV102

0699-1327
0699-4820
0837-0509

1
1
2

RESISTOR 1M +-1% .125W TKF TC=0+-100
RESISTOR 220 5% AXIA1 .5W TC=0+200PPM
DIO, MOV, OPERV=230VRMS, 17J,
CU4032K230GK1

04935
05524
06121

9C12063AFKR
RNX-3/8N220RJM
SIOV-CU4032K230GK1

190

Qty

Part Description

Mfr Part Number
12107C103KATA

Chapter 7 Replaceable Parts
34970-66504 Internal DMM PC Assembly (A4)

34970-66504 Internal DMM PC Assembly (A4)
Reference
Designator
C100
C101-C103
C104
C105
C106-C107
C108
C110
C111
C113
C120
C150
C151
C152
C160
C210
C212
C301
C302
C303
C304
C305
C306
C307
C308-C310
C313
C314-C315
C316
C317
C318
C319-C320
C321
C322-C323
C324
C326
C327
C330
C350-C351
C400-C402

Part
Number
0160-6839
0160-6842
0160-6497
0160-6731
0160-5967
0160-6736
0160-6497
0160-5967
0160-6497
0160-6497
0160-6497
0160-6736
0160-6731
0160-6736
0160-5954
0160-6497
0160-6778
0160-7605
0160-6098
0160-5973
0160-6096
0160-5972
0160-5967
0160-6497
0160-5955
0160-6497
0160-5892
0160-6729
0160-5892
0160-6497
0160-5469
0180-4825
0160-5959
0160-6731
0160-5959
0180-4559
0160-6736
0160-5954

Qty
1
3
17
4
3
7

4
1
1
1
1
1
1

1
2
1

1
2
2

1

Part Description
CAP-FXD 470pF 630 V POLYP-FL
CAP-FXD 220pF 630 V POLYP-FL
CAP-FXD 0.1uF 25 V
CAP-FXD 1000pF 50 V
CAP-FXD 100pF +-5% 50 V CER C0G
CAP-FXD 0.01uF 50 V
CAP-FXD 0.1uF 25 V
CAP-FXD 100pF +-5% 50 V CER C0G
CAP-FXD 0.1uF 25 V
CAP-FXD 0.1uF 25 V
CAP-FXD 0.1uF 25 V
CAP-FXD 0.01uF 50 V
CAP-FXD 1000pF 50 V
CAP-FXD 0.01uF 50 V
CAP 220PF 5% 50V
CAP-FXD 0.1uF 25 V
CAP 0.22uF 400 V
CAP-FXD 1.8pF +-13.89% 1.5 kV CER C0G
CAP-FXD 680pF +-5% 50 V CER C0G
CAP-FXD 6.8pF 50 V
CAP-FXD 470pF +-5% 50 V CER C0G
CAP-FXD 5.6pF +-8.93% 50 V CER C0G
CAP-FXD 100pF +-5% 50 V CER C0G
CAP-FXD 0.1uF 25 V
CAP-FXD 68pF +-5% 50 V CER C0G
CAP-FXD 0.1uF 25 V
CAPACITOR-FXD .22UF +-10% 63VDC
CAP. FIXED. CER./CHIP
CAPACITOR-FXD .22UF +-10% 63VDC
CAP-FXD 0.1uF 25 V
CAPACITOR-FXD 1UF +-10% 50VDC
CAP-FXD 22uF +-20% 35 V TA
CAP-FXD 33pF +-5% 50 V CER C0G
CAP-FXD 1000pF 50 V
CAP-FXD 33pF +-5% 50 V CER C0G
CAP-FXD 68uF +-20% 10 V TA
CAP-FXD 0.01uF 50 V
CAP 220PF 5% 50V

Mfr
Code
02995
02995
02010
02010
03292
02010
02010
03292
02010
02010
02010
02010
02010
02010
02010
02010
05176
02010
02010
02010
02010
02010
03292
02010
12473
02010
05524
02010
05524
02010
10881
12340
02010
02010
02010
12340
02010
02010

Mfr Part Number
703E1AD471PG631TX
703E1AD221PG631TX
12065C104KATA
12065C102KATA
0160-5967
12065C103KATA
12065C104KATA
0160-5967
12065C104KATA
12065C104KATA
12065C104KATA
12065C103KATA
12065C102KATA
12065C103KATA
08055A221JATA
12065C104KATA
HEW-671-220NF+/-10%400V
MA30SA1R8CAA
12065A681JATA
08055A6R8DATA
12065A471JATA
08051A5R6DATA
0160-5967
12065C104KATA
0160-5955
12065C104KATA
MKT1817422065
12065C332KATA
MKT1817422065
12065C104KATA
BF064D0105KDB
T495X226M035AS
08055A330JATA
12065C102KATA
08055A330JATA
T491D686M010AS
12065C103KATA
08055A221JATA

191

7

Chapter 7 Replaceable Parts
34970-66504 Internal DMM PC Assembly (A4)

Reference
Designator
C403-C404
C407-C408
C410
C441-C442
C443
C460
CR103
CR110-CR113
CR115
CR201
CR202
CR203
CR302-CR303
CR304-CR307
CR401-CR402
CR403-CR404
K102-K104
L101

Part
Number
0160-6497
0160-6497
0160-6497
0160-6736
0699-2963
0160-6731
1902-1565
1901-1607
1902-1565
1902-1565
1901-1378
1902-1592
1906-0291
1902-1541
1902-1541
1906-0291
0490-1896
9140-1244

L102

9140-1238

L106

9140-1244

L110-L111

9140-1238

L401-L402
L404
L405-L407
P100
P101
Q104-Q105

9170-1431
9170-1506
9170-1584
34970-61604
34970-61603
1855-0752

2
1
3
1
1
2

Q150-Q153
Q201

1854-1014
1855-0752

4

Q202
Q203-Q210
Q211
Q301

1855-1671
1853-0727
1855-1672
1855-0800

1
8
1
1

192

Qty

3
1
4
1
1
1
4
5

3
2
3

Part Description
CAP-FXD 0.1uF 25 V
CAP-FXD 0.1uF 25 V
CAP-FXD 0.1uF 25 V
CAP-FXD 0.01uF 50 V
RESISTOR 121 +-1pct .1W TKF TC=0+-100
CAP-FXD 1000pF 50 V
DIODE-ZNR 4.7V 5% TO-236 (SOT-23)
DIODE-PWR RECT 400V DO-214AB
DIODE-ZNR 4.7V 5% TO-236 (SOT-23)
DIODE-ZNR 4.7V 5% TO-236 (SOT-23)
DIODE; HV RECTIFIER 1.6KV
DIODE-ZNR 5.1V 5% TO-236 (SOT-23)
DIODE-DUAL 70V 100MA T0-236AA
DIODE-ZNR 3.3V 5% TO-236 (SOT-23)
DIODE-ZNR 3.3V 5% TO-236 (SOT-23)
DIODE-DUAL 70V 100MA T0-236AA
RLY-2C 2A 220V 60WATT 3V-COIL LATCHING
INDUCTOR 1MH +-5% 3.4W-MMX4.8LG-MM
Q=30
INDUCTOR 10UH +-5% 2.8W-MMX3.4LG-MM
Q=30
INDUCTOR 1MH +-5% 3.4W-MMX4.8LG-MM
Q=30
INDUCTOR 10UH +-5% 2.8W-MMX3.4LG-MM
Q=30
CORE-SHLD BEAD
CORE-MAGNETIC
CORE-SHLD BEAD
CABLE, DMM-DGTL
CABLE, DMM-BKPLN
TRANSISTOR J-FET N-CHAN D-MODE
TO-236AA
TRANSISTOR NPN SI TO-236AA PD=350MW
TRANSISTOR J-FET N-CHAN D-MODE
TO-236AA
TRANSISTOR J-FET P-CHAN D-MODE TO-92
TRANSISTOR PNP SI SOT-23 (TO-236AB)
TRANSISTOR J-FET N-CHAN D-MODE TO-92
TRANSISTOR MOSFET N-CHAN E-MODE
TO-252AA

Mfr
Code
02010
02010
02010
02010
00746
02010
02910
04733
02910
02910
04504
02037
02910
02037
02037
02910
12921
05524

12065C104KATA
12065C104KATA
12065C104KATA
12065C103KATA
MCR10-FZHM-F-1210
12065C102KATA
BZX84-C4V7
S3G
12065C102KATA
BZX84-C4V7
GP10Y
BZX84C5V1
BAV99
BZX84C3V3
BZX84C3V3
BAV99
G6SU-2-DC3
IMC-18121000.0UH+/-5%

02366

KL32TE100J

05524

IMC-18121000.0UH+/-5%

02366

KL32TE100J

06352
06352
09808
04726
02362
03406

HF50ACB-453215
HF50ACB201209
25Z0805-0SR
87926-1000T
34970-61603
MMBF4392

04200
03406

TMPT6429
MMBF4392

02237
02237
02237
02037

ZN5461
MMBT6520L
PN4117A_D26Z
MTD3055EL

Mfr Part Number

Chapter 7 Replaceable Parts
34970-66504 Internal DMM PC Assembly (A4)

Reference
Designator
R103
R104
R105
R112-R113
R114-R117
R118
R119
R121
R122
R123
R124
R126-R127
R130
R131
R150
R151
R170
R173
R183
R184
R196
R197
R198
R201
R202
R203-R206
R207
R290
R301-R302
R303
R304
R305
R306
R307
R308
R309
R310
R311-R312
R313
R314

Part
Number
0699-1380
0699-4821
0699-3406
0699-3053
0699-2973
0699-1380
0699-2973
0699-5049
0699-1329
0699-4845
0699-3046
0699-2986
0699-3067
0699-2986
0699-3051
0699-3029
0699-4821
0699-3406
0699-3406
0699-4821
0699-3051
0699-3049
0699-3034
0699-3404
0699-4416
0699-1332
0699-3038
0699-1374
0699-2469
0699-1307
0699-0481
0699-1374
0699-1423
0699-1374
0699-1423
0699-1329
0699-2973
0699-1412
0699-1380
0699-1398

Qty
3
3
3
2
12

1
2
1
1
2
1
2
1

1
1
1
1
4
1
3
2
1
1
3

3
5

Mfr
Code
RESISTOR 3.16K +-1% .125W TKF TC=0+-100
04935
RESISTOR 75K 5% 2512 200V 1W TC=200
05524
RESISTOR 24K +-5% 1W TKF TC=0+-200
05524
RESISTOR 100K +-1% .1W TKF TC=0+-100
02995
RESISTOR 215 +-1% .1W TKF TC=0+-100
06337
RESISTOR 3.16K +-1% .125W TKF TC=0+-100
04935
RESISTOR 215 +-1% .1W TKF TC=0+-100
06337
RESISTOR 5 +-1pct .125W TF TC=0+-20
05524
RESISTOR 6.19K +-1% .125W TKF TC=0+-100
04935
RESISTOR .10 1% RES3F 2W TC=25PPM/DEGC 05524
RESISTOR 6.19K +-1% .1W TKF TC=0+-100
06337
RESISTOR 21.5K +-1% .1W TKF TC=0+-100
06337
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
06337
RESISTOR 21.5K +-1% .1W TKF TC=0+-100
06337
RESISTOR 10K +-1% .1W TKF TC=0+-100
06337
RESISTOR 316 +-1% .1W TKF TC=0+-100
06337
RESISTOR 75K 5% 2512 200V 1W TC=200
05524
RESISTOR 24K +-5% 1W TKF TC=0+-200
05524
RESISTOR 24K +-5% 1W TKF TC=0+-200
05524
RESISTOR 75K 5% 2512 200V 1W TC=200
05524
RESISTOR 10K +-1% .1W TKF TC=0+-100
06337
RESISTOR 8.25K +-1% .1W TKF TC=0+-100
06337
RESISTOR 1K +-1% .1W TKF TC=0+-100
06337
RESISTOR 400K +-1% .125W TF TC=0+-2
06337
RESISTOR 40K +-1% .5W MF TC=0+-.0031
05524
RESISTOR 196K +-1% .125W TKF TC=0+-100
04935
RESISTOR 2.37K +-1% .1W TKF TC=0+-100
06337
RESISTOR 1.78K +-1% .125W TKF TC=0+-100
04935
RESISTOR 500K +-0.25% .25W TF TC=0+-5
09454
RESISTOR 1.96K +-0.1% .1W TF TC=0+-5
02995
RESISTOR 200K +-1% .1W TF TC=0+-10
02995
RESISTOR 1.78K +-1% .125W TKF TC=0+-100
04935
RESISTOR 215 +-1% .125W TKF TC=0+-100
04935
RESISTOR 1.78K +-1% .125W TKF TC=0+-100
04935
RESISTOR 215 +-1% .125W TKF TC=0+-100
04935
RESISTOR 6.19K +-1% .125W TKF TC=0+-100
04935
RESISTOR 215 +-1% .1W TKF TC=0+-100
06337
RESISTOR 75K +-1% .125W TKF TC=0+-100
04935
RESISTOR 3.16K +-1% .125W TKF TC=0+-100
04935
RESISTOR 21.5K +-1% .125W TKF TC=0+-100
04935
Part Description

Mfr Part Number
9C12063AFKR
CRCW2512753J
CRCW2512243J
9C08052A1003FKR
9C08052A2150FKR
9C12063AFKR
9C08052A2150FKR
VTA56V4 5R 1.0% T/R
9C12063AFKR
WSR-2 .1 +/-1%
9C08052A6191FKR
9C08052A2152FKR
9C08052A1472FKR
9C08052A2152FKR
9C08052A1002FKR
9C08052A3160FKR
CRCW2512753J
CRCW2512243J
CRCW2512243J
CRCW2512753J
9C08052A1002FKR
9C08052A8251FKR
9C08052A1001FKR
5023ZT400K0F
S102C40K000 1%
9C12063AFKR
9C08052A2371FKR
9C12063AFKR
PR1/4TC5500K.25%
5023Z
5023Z
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C08052A2150FKR
9C12063AFKR
9C12063AFKR
9C12063AFKR

193

7

Chapter 7 Replaceable Parts
34970-66504 Internal DMM PC Assembly (A4)

Reference
Designator
R315
R316
R317
R318
R319
R320
R321
R322
R323-R324
R325-R326
R327
R398-R399
R403
R405
R406
R407-R408
R409
R420
R421
R422
R430
R440
R441
R442
R450-R451
R460-R461
RV102

Part
Number
0699-1327
0699-1423
0699-1406
0699-1318
0699-1398
0699-1427
0699-1382
0699-1412
0699-1398
0699-2973
0699-1398
0699-1391
0699-1391
0699-1380
0699-1330
0699-1318
0699-1372
0699-1389
0699-1318
0699-1360
0699-1503
0699-1406
0699-1394
0699-2127
0699-2973
0699-2973
0837-0320

1

RESISTOR 1M +-1% .125W TKF TC=0+-100
RESISTOR 215 +-1% .125W TKF TC=0+-100
RESISTOR 42.2K +-1% .125W TKF TC=0+-100
RESISTOR 1K +-1% .125W TKF TC=0+-100
RESISTOR 21.5K +-1% .125W TKF TC=0+-100
RESISTOR 316 +-1% .125W TKF TC=0+-100
RESISTOR 3.83K +-1% .125W TKF TC=0+-100
RESISTOR 75K +-1% .125W TKF TC=0+-100
RESISTOR 21.5K +-1% .125W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 21.5K +-1% .125W TKF TC=0+-100
RESISTOR 10K +-1% .125W TKF TC=0+-100
RESISTOR 10K +-1% .125W TKF TC=0+-100
RESISTOR 3.16K +-1% .125W TKF TC=0+-100
RESISTOR 100K +-1% .125W TKF TC=0+-100
RESISTOR 1K +-1% .125W TKF TC=0+-100
RESISTOR 1.47K +-1% .125W TKF TC=0+-100
RESISTOR 8.25K +-1% .125W TKF TC=0+-100
RESISTOR 1K +-1% .125W TKF TC=0+-100
RESISTOR 46.4 +-1% .125W TKF TC=0+-100
RESISTOR .05 +-100% TKF
RESISTOR 42.2K +-1% .125W TKF TC=0+-100
RESISTOR 14.7K +-1% .125W TKF TC=0+-100
RESISTOR 36.5K +-1% .125W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
VOLTAGE SUPPRESSOR VMAC=230V, VMDC=300V

Mfr
Code
04935
04935
04935
04935
04935
04935
04935
04935
04935
06337
04935
04935
04935
04935
04935
04935
04935
06337
04935
04935
02995
04935
04935
05524
06337
06337
06121

9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C08052A2150FKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063AFKR
9C12063A8251FKR
9C12063AFKR
9C12063AFKR
9C12063A00R0JLR
9C12063AFKR
9C12063AFKR
CRCW12063652F
9C08052A2150FKR
9C08052A2150FKR
S07K230

SCR101
SHD101

0515-0433
34970-00603

1
1

SCREW- X 8MM-LG -HD
SHIELD-DMM

02361
02361

0515-0433
34970-00603

U101
U102
U103
U104
U105
U106
U110
U150
U153

1SK6-0001
1NB4-5035
1826-2420
1855-0864
1826-2558
1826-1925
1826-1810
1820-8937
1826-2420

1
1
5
1
3
2
1
1

INTEGRATED CIRCUIT; ASCI
CUST R NET PKG, REPLACES 34401-67901
IC OP AMP LP DUAL 8 PIN PLSTC-SOIC
TRANSISTOR, JFET DUAL
IC OP AMP WB SINGLE 8 PIN PLSTC-SOIC
IC OP AMP LOW-NOISE SINGLE 8 PIN
IC OP AMP LOW-BIAS-H-IMPD SINGLE 8 PIN
IC Gate-ARY CMOS
IC OP AMP LP DUAL 8 PIN PLSTC-SOIC

02632
02632
03285
03406
02037
03285
01698
03406
03285

1SK6-0001
1NB4-5035
AD706JR
NPDSU406
MC34081BD
OP-27GS
TL071CD
SCX6B04AKP
AD706JR

194

Qty

Part Description

1
2
4
1
1

3

1
1
1
1
1
1
1

Mfr Part Number

Chapter 7 Replaceable Parts
34970-66504 Internal DMM PC Assembly (A4)

Reference
Designator
U201
U301
U302
U303
U304
U305
U306
U307
U308
U309
U310

Part
Number
1826-2420
1826-2436
1826-2339
1826-4084
1826-1985
1826-4084
1826-1609
1827-0267
1826-2445
1820-5790
1826-1572

U311
U312
U400-U401
U402
U403
U411
U420
U450

1820-5790
1826-4084
1826-2420
1826-1991
1826-1249
1821-3334
1826-1925
1818-6821

1

IC OP AMP LP DUAL 8 PIN PLSTC-SOIC
IC OP AMP WB 8 PIN PLSTC-SOIC
IC; 8-BIT 16-P-SOIC CMOS
IC OP AMP ANLG SINGLE 8 PIN PLSTC-SOIC
ANALOG SWITCH 4 SPST 16 -P-SOIC
IC OP AMP ANLG SINGLE 8 PIN PLSTC-SOIC
ANALOG SWITCH 4 SPST 16 -P-SOIC
MC34081BD
RMS/DC 16-P-SOIC MISC
IC SHF-RGTR CMOS/HC SYNCHRO SERIAL-IN
IC COMPARATOR PRCN DUAL 8 PIN
PLSTC-SOIC
IC SHF-RGTR CMOS/HC SYNCHRO SERIAL-IN
IC OP AMP ANLG SINGLE 8 PIN PLSTC-SOIC
IC OP AMP LP DUAL 8 PIN PLSTC-SOIC
IC OP AMP HS SINGLE 8 PIN PLSTC-SOIC
IC, V RGLTR-V-REF-FXD
IC-AN-MUX 74HC4053D 3X2:1 SOURCE-RESTRIC
IC OP AMP LOW-NOISE SINGLE 8 PIN
FRAM SERIAL 4K FMZ4C04-S

XU403

1200-1672

1

SOCKET-IC-DIP 4-CONT DIP-SLDR

Qty
1
1
3
1
1
1
1
2
1

1
1
1

Part Description

Mfr
Code
03285
03406
03285
03285
02883
03285
03285
01698
03285
02910
02910

AD706JR
LF356M
AD7524JR
AD825AR
DG411DY
AD825AR
ADG211AKR
TLE2071ACD
AD637JR
74HC4094D
LM393D

02910
03285
03285
03285
10858
02910
03285
14543

74HC4094D
AD825AR
AD706JR
AD711JR
LM399AH(SEL)
74HC4053D
OP-27GS
FM24C04-S

02194

SBL-041-SP122-TG30

Mfr Part Number

7

195

Chapter 7 Replaceable Parts
34901A 20-Channel Multiplexer

34901A 20-Channel Multiplexer
Reference
Designator
C101-C106
C107
C109
C110
C119-C124
C125
C127
C140-C141
C145
C150
C151-C152
C160-C167
C171-C174
C201-C207
CR102
CR104
CR106
CR107
CR201-CR220
CR221-CR222
CR320-CR322
CR323-CR324
CR325

Part
Number
0160-7798
0160-7708
0160-7798
0160-7828
0160-5947
0160-7845
0160-7845
0160-5945
0160-7798
0180-4545
0160-5945
0160-5967
0160-5945
0160-5945
1906-0395
1902-1574
1902-1574
1906-0291
1906-0291
1906-0395
1906-0291
1906-0395
1902-1574

CAP 0.1 uF 50V 10% X7R 0805
CAP-FXD 1000pF +-5% 50 V CER C0G
CAP 0.1 uF 50V 10% X7R 0805
CAP .1 uF 16V 10% X7R
CAP-FXD 1000pF 50 V
CAP-FXD 180PF +-5% 50 V CER COG
CAP-FXD 180PF +-5% 50 V CER COG
CAP-FXD 0.01 uF 50 V
CAP 0.1 uF 50V 10% X7R 0805
CAP-FXD 4.7 uF +-20% 20 V TA
CAP-FXD 0.01 uF 50 V
CAP-FXD 100pF +-5pct 50 V CER C0G
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.01 uF 50 V
DIODE-DUAL 75V TO-253
DIODE-ZNR 6.8V 6% TO-236 (SOT-23)
DIODE-ZNR 6.8V 6% TO-236 (SOT-23)
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253
DIODE-ZNR 6.8V 6% TO-236 (SOT-23)

Mfr
Code
02010
12340
02010
02010
02010
12340
12340
02010
02010
12340
02010
02010
02010
02010
02910
02910
02910
02910
02910
02910
02910
02910
02910

08055C104KAT_A
C0805C102J5GAC
08055C104KAT_A
0603C104KAT
08055C102KATA
C0603C181J5GAC
C0603C181J5GAC
08055C103KATA
08055C104KAT_A
T491B475M020AS
08055C103KATA
08055A101JAT A
08055C103KATA
08055C103KATA
BAS28
BZX84C6V8
BZX84C6V8
BAV99
BAV99
BAS28
BAV99
BAS28
BZX84C6V8

F501-F502

2110-0043

2

FUSE (INCH) 1.5A 250V NTD FE UL-LST

04703

312 01.5

HAF502
HBF502
HCF501
HDF501

2110-0726
2110-0726
2110-0726
2110-0726

4

FUSEHOLDER-CLP-TYP
FUSEHOLDER-CLP-TYP
FUSEHOLDER-CLP-TYP
FUSEHOLDER-CLP-TYP

02603
02603
02603
02603

1115-0597T
1115-0597T
1115-0597T
1115-0597T

J101
J102-J104
J105
J106

1252-8024
0360-2624
0360-2623
0360-2624

1
4
1

CONN-POST TYPE .100-PIN-SPCG-MTG-END
CONN TERMINAL BK RA FEM 12PIN
CONN TERMNAL BK RA FEM 4 PIN
CONN TERMINAL BK RA FEM 12PIN

05525
13389
13389
13389

26-8477-048-002-025
M1.040.0001.9
M1.040.0001.8
M1.040.0001.9

K401-K420
K421

0490-1896
0490-1895

24
3

RLY-2C 2A 220V 60WATT 3V-COIL LATCHING
RLY-2C 2A 220V 60WATT 4.5V COIL

12921
12921

G6SU-2-DC3
G6S-2-DC4.5

196

Qty
8
1
1
6
2
16

8

5
3
24

Part Description

Mfr Part Number

Chapter 7 Replaceable Parts
34901A 20-Channel Multiplexer

Reference
Designator
K423
K521
K522-K524

Part
Number
0490-1895
0490-1895
0490-1896

L101-L103
L105
L109-L115
L150
L152
L401-L402

9170-1663
9170-1584
9170-1584
9170-1584
9170-1584
9140-1638

MP1

34901-60001

Q101
Q201
Q202-Q203
Q204
Q205
Q206-Q207
Q208-Q209
Q210
Q211
Q212-Q213
Q214
Q215
Q216-Q217
Q218
Q219
Q220-Q221
Q222-Q223
Q224
Q225
Q226-Q227
Q228
Q301-Q303
Q304
Q305
Q306
Q307
Q308

1855-1101
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525

Qty

3
12

2

1
25
22

RLY-2C 2A 220V 60WATT 4.5V COIL
RLY-2C 2A 220V 60WATT 4.5V COIL
RLY-2C 2A 220V 60WATT 3V-COIL LATCHING

Mfr
Code
12921
12921
12921

G6S-2-DC4.5
G6S-2-DC4.5
G6SU-2-DC3

CORE-SHIELDING BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
INDUCTOR 10UH +10% -10% 2.7W-MMX3.4LG-MM

11702
09808
09808
09808
09808
06352

FBM4532HM132
25Z0805-0SR
25Z0805-0SR
25Z0805-0SR
25Z0805-0SR
NLC322522T-100K

KIT, MODULE COVER, CASE

02362

34901-60001

TRANSISTOR
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW

02037
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237

MMDF2P02E
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907

Part Description

Mfr Part Number

7

197

Chapter 7 Replaceable Parts
34901A 20-Channel Multiplexer

Reference
Designator
Q309
Q310
Q311
Q312
Q313
Q314
Q315
Q316
Q317
Q318
Q319

Part
Number
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053

R102-R103
R104
R105
R106-R109
R110-R112
R113
R114-R115
R117-R121
R147
R148
R149
R150-R154
R155
R158
R166-R168
R170-R180
R181
R182
R185
R201-R228
R301-R319

0699-3034
0699-3947
0699-3034
0699-3970
0699-3974
0699-3970
0699-3067
0699-2973
0699-3051
0699-3077
0699-3051
0699-3034
0699-3947
0699-3947
0699-3034
0699-3963
0699-3947
0699-3932
0699-3932
0699-3051
0699-3051

U101
U102-U106
U109

34901-88822 1
1820-5752
5
1820-5941
1

198

Qty

11
4
5
3
2
5
49
1

11
2

TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)

Mfr
Code
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125

KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A

RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .063W TKF TC=0+-200
Resistor 14.7K 1% 0603 50V .063W TC=200
RES 10K 1% .063W
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
RES 215, FIXED THIN FILM
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1M +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 4.64K 1% 0603 50V .063W TC=200
RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 215 +-1% .063W TKF TC=0+-200
RESISTOR 215 +-1% .063W TKF TC=0+-200
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100

06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337

9C08052A1001FKR
9C0603A1001FL
9C08052A1001FKR
232270461003
9C0603A1472FL
232270461003
9C08052A1472FKR
9C08052A2150FKR
9C08052A1002FKR
9C08052A1004FKR
9C08052A1002FKR
9C08052A1001FKR
9C0603A1001FL
9C0603A1001FL
9C08052A1001FKR
9C0603A4641FL
9C0603A1001FL
9C0603A2150FL
9C0603A2150FL
9C08052A1002FKR
9C08052A1002FKR

PRGM’D 1821-1876
IC FF CMOS/HC D-TYPE POS-EDGE-TRIG COM
IC DCDR-DEMUXR CMOS/ACT BIN 8-TO-1-LINE

01542
02910
03406

34901-88822
74HC574D
74ACT138SC

Part Description

Mfr Part Number

Chapter 7 Replaceable Parts
34901A 20-Channel Multiplexer

Reference
Designator
U141
U150
U151-U152

Part
Number
1821-0055
1818-6821
1821-4861

1
1
2

IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP
FRAM SERIAL 4K FMZ4C04-S
IC INTERFACE MISC

Mfr
Code
02037
14543
12186

XU101

1200-1592

1

SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD

01380

3-822275-1

Y101

0410-4009

1

CERO-RES 12MHZ +1-0.8%

00830

PBRC-12.0BRN07

Qty

Part Description

Mfr Part Number
MC74ACT132D
FM24C04-S
DS75S

7

199

Chapter 7 Replaceable Parts
34902A 16-Channel Multiplexer

34902A 16-Channel Multiplexer
Reference
Designator
C101-C104
C105-C112
C113
C120
C125
C127
C140-C141
C150
C151-C152
C160-C162
C212-C214

Part
Number
0160-7798
0160-5967
0160-7828
0160-5947
0160-7845
0160-7845
0160-5945
0180-4545
0160-5945
0160-7708
0160-5945

CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 100PF 5% 0805
CAP .1UF 16V 10% X7R
CAP-FXD 1000pF 50 V
CAP FXD 180PF +-5% 50 V CER COG
CAP FXD 180PF +-5% 50 V CER COG
CAP-FXD 0.01uF 50 V
CAP-FXD 4.7uF +-20% 20 V TA
CAP-FXD 0.01uF 50 V
CAP-FXD 1000pF +-5% 50 V CER C0G
CAP-FXD 0.01uF 50 V

Mfr
Code
02010
03292
02010
02010
12340
12340
02010
12340
02010
12340
02010

CR102
CR104
CR106
CR107
CR201-CR210
CR211

1906-0395
1902-1574
1902-1574
1906-0291
1906-0395
1902-1572

1

DIODE-DUAL 75V TO-253
DIODE-ZNR 6.8V 6% TO-236 (SOT-23)
DIODE-ZNR 6.8V 6% TO-236 (SOT-23)
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253
DIODE-ZNR 15V 5% TO-236 (SOT-23) PD=.35W

02910
02910
02910
02910
02910
02910

BAS28
BZX84C6V8
BZX84C6V8
BAV99
BAS28
BZX84-C15

J101
J401-J403

1252-8024
0360-2624

1
3

CONN-POST TYPE .100-PIN-SPCG-MTG-END
CONN TERMINAL BK RA FEM 12PIN

05525
13389

26-8477-048-002-025
M1.040.0001.9

K301-K316
K326-K328

0490-1897
0490-1897

19

RELAY-REED 2A 1A 300VDC 5VDC-COIL
RELAY-REED 2A 1A 300VDC 5VDC-COIL

04501
04501

3500-0113
3500-0113

L101-L102
L104
L109-L115
L150
L152
L300
L301-L302

9170-1663
9170-1584
9170-1584
9170-1584
9170-1584
9170-1663
9140-1638

3
10

11702
09808
09808
09808
09808
11702
06352

FBM4532HM132
25Z0805-0SR
25Z0805-0SR
25Z0805-0SR
25Z0805-0SR
FBM4532HM132
NLC322522T-100K

MP1

34901-60001

CORE-SHIELDING BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHIELDING BEAD
INDUCTOR 10UH +10% -10%
2.7W-MMX3.4LG-MM
KIT, MODULE COVER, CASE

02362

34901-60001

200

Qty
4
8
1
1
2
7
1
3

11
2
1

2

Part Description

Mfr Part Number
08055C104KAT_A
0160-5967
0603C104KAT
08055C102KATA
C0603C181J5GAC
C0603C181J5GAC
08055C103KATA
T491B475M020AS
08055C103KATA
C0805C102J5GAC
08055C103KATA

Chapter 7 Replaceable Parts
34902A 16-Channel Multiplexer

Reference
Designator
Q101
Q201-Q218
Q220

Part
Number
1855-1101
1854-1053
1854-1053

1
19

TRANSISTOR
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR NPN SI SOT-23 (TO-236AB)

Mfr
Code
02037
12125
12125

R102-R103
R105
R106-R109
R110-R112
R113
R114
R115
R117-R135
R136-R138
R140
R141-R143
R148
R149
R150-R151
R155
R157
R160-R162
R166-R168
R170-R177
R182
R185
R401-R404

0699-3034
0699-3034
0699-3970
0699-3974
0699-3970
0699-2973
0699-3067
0699-3051
0699-3947
0699-3051
0699-3947
0699-3077
0699-3051
0699-2973
0699-3947
0699-3947
0699-2973
0699-3034
0699-3963
0699-3932
0699-3932
0699-4867

6

4

RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RES 10K 1% .063W
Resistor 14.7K 1% 0603 50V .063W TC=200
RES 10K 1% .063W
RES 215, FIXED THIN FILM
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 1M +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RES 215, FIXED THIN FILM
RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 1K +-1% .063W TKF TC=0+-200
RES 215, FIXED THIN FILM
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 4.64K 1% 0603 50V .063W TC=200
RESISTOR 215 +-1% .063W TKF TC=0+-200
RESISTOR 215 +-1% .063W TKF TC=0+-200
RESISTOR 10 1% 12181.0w tc=0+100

06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337

9C08052A1001FKR
9C08052A1001FKR
232270461003
9C0603A1472FL
232270461003
9C08052A2150FKR
9C08052A1472FKR
9C08052A1002FKR
9C0603A1001FL
9C08052A1002FKR
9C0603A1001FL
9C08052A1004FKR
9C08052A1002FKR
9C08052A2150FKR
9C0603A1001FL
9C0603A1001FL
9C08052A2150FKR
9C08052A1001FKR
9C0603A4641FL
9C0603A2150FL
9C0603A2150FL
23227351001

U101
U102-U104
U141
U150
U151-U152

34902-88842
1820-5752
1821-0055
1818-6821
1821-4861

1
3
1
1
2

PRGM’D 1821-1876
IC FF CMOS/HC D-TYPE POS-EDGE-TRIG COM
IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP
FRAM SERIAL 4K FMZ4C04-S
IC INTERFACE MISC

02632
02910
02037
14543
12186

34902-88842
74HC574D
MC74ACT132D
FM24C04-S
DS75S

XU101
Y101

1200-1592
0410-4009

1
1

SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD
CERO-RES 12MHZ +1-0.8%

01380
00830

3-822499-1
PBRC-12.0BRN07

Qty

5
3
6
1
21
8

1

8
2

Part Description

Mfr Part Number
MMDF2P02E
KST2222A
KST2222A

7

201

Chapter 7 Replaceable Parts
34903A 20-Channel Actuator

34903A 20-Channel Actuator
Reference
Designator
C101-C104
C107
C110
C116-C118
C120-C127
C140-C141
C150
C201-C207

Part
Number
0160-7798
0160-5947
0160-7798
0160-5947
0160-5967
0160-5945
0180-4545
0160-5945

CAP 0.1UF +-10% 50V CER X7R
CAP-FXD 1000pF 50 V
CAP 0.1UF +-10% 50V CER X7R
CAP-FXD 1000pF 50 V
CAP-FXD 100pF +-5% 50 V CER C0G
CAP-FXD 0.01uF 50 V
CAP-FXD 4.7uF +-20% 20 V TA
CAP-FXD 0.01uF 50 V

Mfr
Code
06352
02010
06352
02010
06352
02010
12340
02010

CR102
CR103
CR201-CR220
CR221-CR222
CR224-CR225

1906-0395
1902-1544
1906-0291
1906-0395
1906-0395

5
1
20

DIODE-DUAL 75V TO-253
DIODE-ZNR 10V 5% TO-236 (SOT-23) PD=.35W
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253
DIODE-DUAL 75V TO-253

02910
02910
02910
02910
02910

BAS28
BZX84C10
BAV99
BAS28
BAS28

J101
J301-J305

1252-8024
0360-2624

1
5

CONN-POST TYPE .100-PIN-SPCG-MTG-END
CONN TERMINAL BK RA FEM 12PIN

05525
13389

26-8477-048-002-025
M1.040.0001.9

K208
K301-K320

0490-1896
0490-1896

20

RLY-2C 2A 220V 60WATT 3V-COIL LATCHING
RLY-2C 2A 220V 60WATT 3V-COIL LATCHING

12921
12921

G6SU-2-DC3
G6SU-2-DC3

L101-L102
L105
L109-L111

9170-1663
9170-1584
9170-1584

2
4

CORE-SHIELDING BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD

11702
09808
09808

FBMH4532HM132-T
25Z0805-0SR
25Z0805-0SR

MP1

34901-60001

KIT, MODULE COVER, CASE

02362

34901-60001

Q101
Q201
Q202-Q203
Q204
Q205
Q206-Q207
Q208-Q209
Q210
Q211
Q212-Q213
Q214

1855-1101
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525

TRANSISTOR-MOSFET DUAL P-CHAN E-MODE SI
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW

02037
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237

MMDF2P02E
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907

202

Qty
5
4

8
9
1

1
14
14

Part Description

Mfr Part Number
C2012X7R1H104K
08055C102KATA
C2012X7R1H104K
08055C102KATA
C2012COG1H101J
08055C103KATA
T491B475M020AS
08055C103KATA

Chapter 7 Replaceable Parts
34903A 20-Channel Actuator

Reference
Designator
Q215
Q216-Q217
Q218
Q219
Q220-Q221
Q222-Q223
Q224
Q225
Q226-Q227
Q228

Part
Number
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525

TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW

Mfr
Code
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237

R102-R103
R105
R106-R109
R110-R112
R113
R114
R115
R116-R118
R120-R121
R122-R127
R140
R148
R149
R166-R168
R170-R177
R201-R228

0699-3034
0699-3034
0699-3051
0699-3067
0699-3051
0699-2973
0699-3067
0699-2973
0699-2973
0699-3034
0699-3051
0699-3077
0699-3051
0699-3034
0699-3044
0699-3051

RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1M +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 4.64K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100

00746
00746
06337
00746
06337
06337
00746
06337
06337
00746
06337
00746
06337
00746
06337
06337

MCR10-F-X-1001
MCR10-F-X-1001
9C08052A1002FKR
MCR10-F-X-1472
9C08052A1002FKR
9C08052A2150FKR
MCR10-F-X-1472
9C08052A2150FKR
9C08052A2150FKR
MCR10-F-X-1001
9C08052A1002FKR
MCR10-F-X-1004
9C08052A1002FKR
MCR10-F-X-1004
9C08052A4641FKR
9C08052A1002FKR

U101
U102-U104
U141
U150

34903-88801
1820-5752
1821-0055
1818-6821

1
3
1
1

PROGMD 1821-1876 MCU N87C52
IC FF CMOS/HC D-TYPE POS-EDGE-TRIG COM
IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP
FRAM SERIAL 4K FMZ4C04-S

02632
02910
02037
14543

34903-88801
74HC574D
MC74ACT132D
FM24C04-S

XU101

1200-1592

1

SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD

01380

3-822499-1

Y101

0410-4009

1

CERO-RES 12MHZ +1-0.8%

00830

PBRC-12.0BRN07

Qty

12
35
4
6

1

8

Part Description

Mfr Part Number
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907

203

7

Chapter 7 Replaceable Parts
34904A 4x8 Matrix

34904A 4x8 Matrix
Reference
Designator
C140
C151
C154-C157
C158
C164-C165
C166
C201-C207

Part
Number
0160-7798
0160-5947
0160-5945
0180-4545
0160-5967
0160-5945
0160-5945

1
1
12
1
2

CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 1000pF 50 V
CAP-FXD 0.01uF 50 V
CAP-FXD 4.7uF +-20% 20 V TA
CF 100PF 5% 0805
CAP-FXD 0.01uF 50 V
CAP-FXD 0.01uF 50 V

Mfr
Code
02010
02010
02010
12340
03292
02010
02010

CR101-CR109
CR110-CR111
CR201-CR208
CR301-CR308
CR401-CR408
CR409

1906-0291
1906-0395
1906-0291
1906-0291
1906-0291
1906-0395

33
3

DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253

02910
02910
02910
02910
02910
02910

BAV99
BAS28
BAV99
BAV99
BAV99
BAS28

J101
J102-J107

1252-8024
0360-2623

1
6

CONN-POST TYPE .100-PIN-SPCG-MTG-END
CONN TERMNAL BK RA FEM 4 PIN

05525
13389

26-8477-048-002-025
M1.040.0001.8

K101-K108
K201-K208
K301-K308
K401-K408

0490-1896
0490-1896
0490-1896
0490-1896

32

RLY-2C 2A 220V 60WATT 3V-COIL LATCHING
RLY-2C 2A 220V 60WATT 3V-COIL LATCHING
RLY-2C 2A 220V 60WATT 3V-COIL LATCHING
RLY-2C 2A 220V 60WATT 3V-COIL LATCHING

12921
12921
12921
12921

G6SU-2-DC3
G6SU-2-DC3
G6SU-2-DC3
G6SU-2-DC3

L101-L102
L105-L109

9140-1782
9170-1584

2
5

INDUCTOR 4.7uH +10% -10%
CORE-SHLD BEAD

06352
09808

NLC565050T-4R7K
25Z0805-0SR

MP1

34901-60001

KIT, MODULE COVER, CASE

02362

34901-60001

Q101
Q111
Q113
Q121
Q123
Q131
Q133
Q141
Q143
Q211

1855-1101
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525

TRANSISTOR
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW

02037
02237
12125
02237
12125
02237
12125
02237
12125
02237

MMDF2P02E
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907

204

Qty

1
12
12

Part Description

Mfr Part Number
08055C104KAT_A
08055C102KATA
08055C103KATA
T491B475M020AS
0160-5967
08055C103KATA
08055C103KATA

Chapter 7 Replaceable Parts
34904A 4x8 Matrix

Reference
Designator
Q213
Q221
Q223
Q231
Q233
Q241
Q243
Q251
Q253
Q261
Q263
Q271
Q273
Q281
Q283

Part
Number
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053

R111
R113
R121
R123
R131
R133
R141
R143
R147
R148
R149
R151-R152
R154
R155
R156-R158
R160-R163
R164-R165
R166-R168
R211
R213
R221
R223
R231
R233

0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3053
0699-3051
0699-3034
0699-3034
0699-3061
0699-3067
0699-3051
0699-2973
0699-3034
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051

Qty

32

1
6
1
3
2

TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)

Mfr
Code
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125

KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A

RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 261 +-1% .1W TKF TC=0+-100
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RES 215, FIXED THIN FILM
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100

06337
06337
06337
06337
06337
06337
06337
06337
06337
02995
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337

9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1003FKR
9C08052A1002FKR
9C08052A1001FKR
9C08052A1001FKR
9C08052A2610FKR
9C08052A1472FKR
9C08052A1002FKR
9C08052A2150FKR
9C08052A1001FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR

Part Description

Mfr Part Number

205

7

Chapter 7 Replaceable Parts
34904A 4x8 Matrix

Reference
Designator
R241
R243
R251
R253
R261
R263
R271
R273
R281
R283-R284
R287

Part
Number
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051
0699-3051

RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100

Mfr
Code
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337
06337

9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR
9C08052A1002FKR

U101
U102-U103
U111
U141

34903-88801
1820-5752
1818-6821
1821-0055

1
2
1
1

PROGMD 1821-1876 MCU N87C52
IC FF CMOS/HC D-TYPE POS-EDGE-TRIG COM
FRAM SERIAL 4K FMZ4C04-S
IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP

02632
02910
14543
02037

34903-88801
74HC574D
FM24C04-S
MC74ACT132D

XU101

1200-1592

1

SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD

01380

3-822499-1

Y101

0410-4009

1

CERO-RES 12MHZ +1-0.8%

00830

PBRC-12.0BRN07

206

Qty

Part Description

Mfr Part Number

Chapter 7 Replaceable Parts
34905A/34906A RF Multiplexer

34905A/34906A RF Multiplexer
Reference
Designator
C101-C103
C111
C140
C151
C158
C164-C165
C166
C201-C204
CR102
CR170

Part
Number
0160-5945
0160-5945
0160-7798
0160-5947
0180-4545
0160-5967
0160-5945
0160-5945
1906-0291
1906-0395

1
1

CAP-FXD 0.01uF 50 V
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 1000pF 50 V
CAP-FXD 4.7uF +-20% 20 V TA
CF 100PF 5% 0805
CAP-FXD 0.01uF 50 V
CAP-FXD 0.01uF 50 V
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253

Mfr
Code
02010
02010
02010
02010
12340
03292
02010
02010
02910
02910

J101

1252-8024

1

CONN-POST TYPE .100-PIN-SPCG-MTG-END

05525

26-8477-048-002-025

K101-K103
K201-K203

0490-1671
0490-1671

6

01850
01850

RG1ET-L-3V-H14
RG1ET-L-3V-H14

K101-K103
K201-K203
L105-L109
L170-L171

0490-1672
0490-1672
9170-1584
9140-1782

6

RELAY, RG1ET-L-3V
RELAY, RG1ET-L-3V
For 34905A 50Ω RF Multiplexer:
RELAY, 1C 3VDC-COIL 1A 24 VDC
RELAY, 1C 3VDC-COIL 1A 24 VDC
CORE-SHLD BEAD
INDUCTOR 4.7uH +10% -10%

01850
01850
09808
06352

RG1E-L-3V-H13
RG1E-L-3V-H13
25Z0805-0SR
NLC565050T-4R7K

MP1
P1-P10

34901-60001
1250-1377
10

02362
03621

34901-60001
5164-5003-09

P1-P10
Q101
Q102
Q103
Q104
Q105
Q106
Q107
Q108
Q109
Q110
Q111
Q112
Q170

1250-2339
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1855-1101

03621
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
02037

131-8701-301
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
MMDF2P02E

Qty
9
1
1
1
2

5
2

10
12
36

1

Part Description

KIT, MODULE COVER, CASE
CONNECTOR-RF SMB JACK PC-W/O-STDF 50-OHM
For 34906A 75Ω RF Multiplexer:
CONNECTOR-RF SMB JACK PC-W/O-STDF 75-OHM
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR-MOSFET DUAL P-CHAN E-MODE SI

Mfr Part Number
08055C103KATA
08055C103KATA
08055C104KAT_A
08055C102KATA
T491B475M020AS
0160-5967
08055C103KATA
08055C103KATA
BAV99
BAS28

7

207

Chapter 7 Replaceable Parts
34905A/34906A RF Multiplexer

Reference
Designator
Q201
Q202
Q203
Q204
Q205
Q206
Q207
Q208
Q209
Q210
Q211
Q212
Q231-Q254

Part
Number
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1853-0525

TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR PNP SI TO-236AA PD=200MW

Mfr
Code
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
02237

R27
R101-R112
R140
R148
R149
R151-R152
R154
R155
R156-R158
R159-R163
R164-R165
R166-R168
R201-R212

0699-3034
0699-3040
0699-3051
0699-3053
0699-3051
0699-3034
0699-3034
0699-3061
0699-3067
0699-3051
0699-2973
0699-3034
0699-3040

RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 3.16K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 261 +-1% .1W TKF TC=0+-100
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 3.16K +-1% .1W TKF TC=0+-100

06337
02995
06337
02995
06337
06337
06337
06337
06337
06337
06337
06337
02995

9C08052A1001FKR
9C08052A3161FKR
9C08052A1002FKR
9C08052A1003FKR
9C08052A1002FKR
9C08052A1001FKR
9C08052A1001FKR
9C08052A2610FKR
9C08052A1472FKR
9C08052A1002FKR
9C08052A2150FKR
9C08052A1001FKR
9C08052A3161FKR

SH101
SH103
SH201
SH203

34905-60601 4
34905-60601
34905-60601
34905-60601

SHIELD-RF
SHIELD-RF
SHIELD-RF
SHIELD-RF

01642
01642
01642
01642

34905-60601
34905-60601
34905-60601
34905-60601

U101
U102-U103
U111
U141
XU101
Y101

34903-88801
1820-5752
1818-6821
1821-0055
1200-1592
0410-4009

PROGMD 1821-1876 MCU N87C52
IC FF CMOS/HC D-TYPE POS-EDGE-TRIG COM
FRAM SERIAL 4K FMZ4C04-S
IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP
SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD
CERO-RES 12MHZ +1-0.8%

02632
02910
14543
02037
01380
00830

34903-88801
74HC574D
FM24C04-S
MC74ACT132D
3-822499-1
PBRC-12.0BRN07

208

Qty

24
7
1
7
1
3
2

1
2
1
1
1
1

Part Description

Mfr Part Number
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
MMBT2907

Chapter 7 Replaceable Parts
34907A Multifunction Module

34907A Multifunction Module
Reference
Designator
C101-C102
C103
C104-C105
C106-C108
C110-C112
C120
C140
C150
C203
C204
C205
C206-C207
C208
C211-C214
C301
C302
C401
C402
C502-C505
C506
C507-C508
C510
C511
C512
C513-C514
C515-C516
C520
C521
C522
C523-C524
C531
C532
C533
C534
C550-C551
C552

Part
Number
0160-7798
0160-5945
0160-7798
0160-5945
0160-5967
0160-5947
0160-7798
0180-4545
0160-5945
0160-7798
0160-5945
0160-7798
0180-4287
0160-5967
0160-7798
0160-5945
0160-7798
0160-5945
0160-7798
0160-5945
0160-7798
0180-4116
0160-6218
0160-5944
0180-4287
0180-3751
0180-4287
0180-3744
0160-7798
0180-4287
0160-5967
0160-5947
0160-5967
0160-5947
0160-7733
0160-5947

Qty
17
9

9
4
1

6

1
1
1
2
1
1

2

Part Description
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 0.01uF 50 V
CAP-FXD 100pF +-5% 50 V CER C0G
CAP-FXD 1000pF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 4.7uF +-20% 20 V TA
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 10uF +-20% 35 V TA
CAP-FXD 100pF +-5% 50 V CER C0G
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 22uF 20 V TA
CAP-FXD 4700pF 50 V
CAP-FXD 0.047uF 50 V
CAP-FXD 10uF +-20% 35 V TA
CAP-FXD 1uF +-20% 35 V TA
CAP-FXD 10uF +-20% 35 V TA
TANT SMD 4.7 20%
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 10uF +-20% 35 V TA
CAP-FXD 100pF +-5% 50 V CER C0G
CAP-FXD 1000pF 50 V
CAP-FXD 100pF +-5% 50 V CER C0G
CAP-FXD 1000pF 50 V
CAP-FXD 100pF +-1% 50 V CER C0G
CAP-FXD 1000pF 50 V

Mfr
Code
02010
02010
02010
02010
03292
02010
02010
12340
02010
02010
02010
02010
05524
03292
02010
02010
02010
02010
02010
02010
02010
00039
12473
12473
05524
00039
05524
00039
02010
05524
03292
02010
03292
02010
12340
02010

Mfr Part Number
08055C104KAT_A
08055C103KATA
08055C104KAT_A
08055C103KATA
0160-5967
08055C102KATA
08055C104KAT_A
T491B475M020AS
08055C103KATA
08055C104KAT_A
08055C103KATA
08055C104KAT_A
293D106X0035D2W
0160-5967
08055C104KAT_A
08055C103KATA
08055C104KAT_A
08055C103KATA
08055C104KAT_A
08055C103KATA
08055C104KAT_A
NRD226M20R12
0160-6218
0160-5944
293D106X0035D2W
NRS105M35R8
293D106X0035D2W
NRS475M10R8
08055C104KAT_A
293D106X0035D2W
0160-5967
08055C102KATA
0160-5967
08055C102KATA
C0805C101F5GAC
08055C102KATA

209

7

Chapter 7 Replaceable Parts
34907A Multifunction Module

Reference
Designator
CR101-CR106
CR110
CR301-CR308
CR401-CR408
CR501-CR504
CR505-CR506
CR507
CR510-CR511
CR520-CR521
CR530
CR531

Part
Number
1906-0358
1906-0291
1906-0358
1906-0358
1901-1386
1902-1643
1901-1582
1901-1332
1906-0291
1901-1348
1906-0291

DIODE-DUAL 100V 100MA TO-236AB (SOT-23)
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 100V 100MA TO-236AB (SOT-23)
DIODE-DUAL 100V 100MA TO-236AB (SOT-23)
DIO SI PN SOT23 100V 750MA BAS78B
DIODE-ZNR 15V PD=1.5W IR=1UA
DIODE-PWR RECT 30V 500MA
DIODE-UNMOUNTED CHIP
DIODE-DUAL 70V 100MA T0-236AA
DIO TVS UNIDIR SMB 24V 600WP SMBJ24A
DIODE-DUAL 70V 100MA T0-236AA

Mfr
Code
03406
02910
03406
03406
06121
02037
02037
03038
02910
03287
02910

MMBD1203-HIGH
BAV99
MMBD1203-HIGH
MMBD1203-HIGH
BAS78B
1SMB5929B
MBR0530T3
10BQ040
BAV99
SMBJ24A
BAV99

FB501-FB506

9170-1584

8

CORE-SHLD BEAD

09808

25Z0805-0SR

J101

1252-8024

1

CONN-POST TYPE .100-PIN-SPCG-MTG-END

05525

26-8477-048-002-025

L105
L109
L201-L202
L501-L502
L510

9170-1584
9170-1584
9140-1782
9140-1638
9140-2152

2
2
1

CORE-SHLD BEAD
CORE-SHLD BEAD
INDUCTOR 4.7uH +10% -10%
INDUCTOR 10UH +10% -10% 2.7W-MMX3.4LG-MM
L SMT 22uH 20% 1.32A

09808
09808
06352
06352
05524

L515-L516

9140-1238

2

INDUCTOR 10UH +-5% 2.8W-MMX3.4LG-MM Q=30

02366

25Z0805-0SR
25Z0805-0SR
NLC565050T-4R7K
NLC322522T-100K
LPE-4841 220UH
+/-20% B
KL32TE100J

MAL510
MAP102

34907-00601 1
1258-0209
1

SHIELD
JUMPER - REMOVABLE, TWO POSITION

02631
01380

34907-00601
531220-2

MP1
P101
P102
P301
P401
P501

34901-60001
0360-2623
2
1251-4670
1
0360-2624
2
0360-2624
0360-2623

KIT, MODULE COVER, CASE
CONN TERMNAL BK RA FEM 4 PIN
CONN-POST TYPE .100-PIN-SPCG 3-CONT
CONN TERMINAL BK RA FEM 12PIN
CONN TERMINAL BK RA FEM 12PIN
CONN TERMNAL BK RA FEM 4 PIN

02362
13389
04726
13389
13389
13389

34901-60001
M1.040.0001.8
2403-6112TB
M1.040.0001.9
M1.040.0001.9
M1.040.0001.8

Q301-Q308
Q401-Q408

1855-0800
1855-0800

16

TRANSISTOR MOSFET N-CHAN E-MODE TO-252AA
TRANSISTOR MOSFET N-CHAN E-MODE TO-252AA

02037
02037

MTD3055EL
MTD3055EL

R101-R102
R104
R105

0699-3034
0699-3034
0699-3053

8

RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100

06337
06337
02995

9C08052A1001FKR
9C08052A1001FKR
9C08052A1003FKR

210

Qty
22
4

4
2
1
2
1

4

Part Description

Mfr Part Number

Chapter 7 Replaceable Parts
34907A Multifunction Module

Reference
Designator
R108
R109
R110-R111
R112
R113
R114
R115
R116
R117
R118
R119
R120-R123
R124
R125-R128
R129
R130-R133
R134-R135
R140
R141
R148
R151-R153
R166-R168
R205
R211-R214
R215-R216
R301
R302
R501
R502
R503
R504
R505-R506
R510
R511
R512
R513
R514
R518
R531-R534
R550-R551

Part
Number
0699-3053
0699-3051
0699-2973
0699-3053
0699-3070
0699-3044
0699-3052
0699-2997
0699-3052
0699-3044
0699-2986
0699-1319
0699-3008
0699-1319
0699-3008
0699-1319
0699-3008
0699-3052
0699-3049
0699-3053
0699-2643
0699-3034
0699-3051
0699-2973
0699-3051
0699-3047
0699-3045
0699-3602
0699-2838
0699-3602
0699-2838
0699-3052
0699-3036
0699-3046
0699-2962
0699-3044
0699-3034
0699-3034
0699-2973
0699-3832

Qty
4
10
1
3
5
1

1
16
4

1
3

1
1
2
2

1
1
1

2

Part Description
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 26.1K +-1% .1W TKF TC=0+-100
RESISTOR 4.64K +-1% .1W TKF TC=0+-100
RESISTOR 12.1K +-1% .1W TKF TC=0+-100
RESISTOR 133K +-1% .1W TKF TC=0+-100
RESISTOR 12.1K +-1% .1W TKF TC=0+-100
RESISTOR 4.64K +-1% .1W TKF TC=0+-100
RESISTOR 21.5K +-1% .1W TKF TC=0+-100
RESISTOR 12.1K +-1% .125W TKF TC=0+-100
RESISTOR 511K +-1% .1W TKF TC=0+-100
RESISTOR 12.1K +-1% .125W TKF TC=0+-100
RESISTOR 511K +-1% .1W TKF TC=0+-100
RESISTOR 12.1K +-1% .125W TKF TC=0+-100
RESISTOR 511K +-1% .1W TKF TC=0+-100
RESISTOR 12.1K +-1% .1W TKF TC=0+-100
RESISTOR 8.25K +-1% .1W TKF TC=0+-100
RESISTOR 100K +-1% .1W TKF TC=0+-100
RESISTOR 0 +-5% .1W TKF TC=0+-300
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 6.81K +-1% .1W TKF TC=0+-100
RESISTOR 5.11K +-1% .1W TKF TC=0+-100
RESISTOR 12.4K +-0.1% .125W TF TC=0+-25
RESISTOR 40K +-0.1% .125W TF TC=0+-25
RESISTOR 12.4K +-0.1% .125W TF TC=0+-25
RESISTOR 40K +-0.1% .125W TF TC=0+-25
RESISTOR 12.1K +-1% .1W TKF TC=0+-100
RESISTOR 1.96K +-1% .1W TKF TC=0+-100
RESISTOR 6.19K +-1% .1W TKF TC=0+-100
RESISTOR 68.1K +-1% .1W TKF TC=0+-100
RESISTOR 4.64K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 51.1 +-1% .1W TKF TC=0+-100

Mfr
Code
02995
06337
06337
02995
06337
06337
02995
06337
02995
06337
06337
04935
06337
04935
06337
04935
06337
02995
06337
02995
06337
06337
06337
06337
06337
02995
06337
06337
06337
06337
06337
02995
06337
06337
06337
06337
06337
06337
06337
06337

Mfr Part Number
9C08052A1003FKR
9C08052A1002FKR
9C08052A2150FKR
9C08052A1003FKR
9C08052A2612FKR
9C08052A4641FKR
9C08052A1212FKR
9C08052A1333FKR
9C08052A1212FKR
9C08052A4641FKR
9C08052A2152FKR
9C12063AFKR
9C08052A5113FKR
9C12063AFKR
9C08052A5113FKR
9C12063AFKR
9C08052A5113FKR
9C08052A1212FKR
9C08052A8251FKR
9C08052A1003FKR
9C08052A0R00JL
9C08052A1001FKR
9C08052A1002FKR
9C08052A2150FKR
9C08052A1002FKR
9C08052A6811FKR
9C08052A5111FKR
9C12063A1242BE
9C12063A4002BE
9C12063A1242BE
9C12063A4002BE
9C08052A1212FKR
9C08052A1961FKR
9C08052A6191FKR
9C08052A6812FKR
9C08052A4641FKR
9C08052A1001FKR
9C08052A1001FKR
9C08052A2150FKR
9C08052A51R1FK

211

7

Chapter 7 Replaceable Parts
34907A Multifunction Module

Reference
Designator
R552
R553-R556

Part
Number
0699-3061
0699-1319

RP101-RP102
RP104-RP105
RP201-RP204
RP301-RP302
RP303-RP304
RP305-RP306
RP307-RP308
RP401-RP402
RP403-RP404
RP405-RP406
RP407-RP408

1810-1580
1810-1580
1810-1831
1810-1660
1810-1580
1810-1521
1810-1580
1810-1660
1810-1580
1810-1521
1810-1580

U101
U102
U103
U104
U105-U106
U107
U108
U109
U110
U111
U201-U204
U205-U206
U301-U302
U401-U402
U502
U503-U504
U505-U506
U510

34907-88811
1818-6821
1820-7312
1820-4220
1820-5752
1821-0055
1826-2116
1826-1594
1820-5804
1820-4938
1820-5752
1820-4216
1826-1225
1826-1225
1826-3088
1826-2793
1826-2819
1826-3193

VR101-VR104
XU101
Y101

1901-1410
1200-1592
0410-4009

212

1

RESISTOR 261 +-1% .1W TKF TC=0+-100
RESISTOR 12.1K +-1% .125W TKF TC=0+-100

Mfr
Code
06337
04935

12

RESISTOR; CARBON FILM;NTWRK
RESISTOR; CARBON FILM;NTWRK
NETWORK-RES 620 X 4 5% 1206 .125W 200V
NETWORK-RES 3.3KX4 5% 1206 .125W 200W
RESISTOR; CARBON FILM;NTWRK
NETWORK-RES 100K X 4 5% 1206 .125W 200V
RESISTOR; CARBON FILM;NTWRK
NETWORK-RES 3.3KX4 5% 1206 .125W 200W
RESISTOR; CARBON FILM;NTWRK
NETWORK-RES 100K X 4 5% 1206 .125W 200V
RESISTOR; CARBON FILM;NTWRK

00746
00746
09891
09891
00746
09891
00746
09891
00746
09891
00746

MNR34K5AWJ103
MNR34K5AWJ103
CN2B4TE621J
CN2B4332J
MNR34K5AWJ103
CN2B4104J
MNR34K5AWJ103
CN2B4332J
MNR34K5AWJ103
CN2B4104J
MNR34K5AWJ103

1
2
2
1

PROGRAM PART
FRAM SERIAL 4K FMZ4C04-S
IC SCHMITT-TRIG CMOS/ACT INV HEX
IC GATE CMOS/HC OR QUAD 2-INP
IC FF CMOS/HC D-TYPE POS-EDGE-TRIG COM
IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP
IC OP AMP LP DUAL 8 PIN PLSTC-SOIC
IC COMPARATOR GP SINGLE 8 PIN PLSTC-SOIC
IC SHF-RGTR CMOS/HC SYNC/ASYNC
IC GATE CMOS/HC EXCL-OR QUAD 2-INP
IC FF CMOS/HC D-TYPE POS-EDGE-TRIG COM
IC DRVR CMOS/HC BUS OCTL
IC COMPARATOR LP QUAD 14 PIN PLSTC-SOIC
IC COMPARATOR LP QUAD 14 PIN PLSTC-SOIC
IC PWR MGT-V-REG-ADJ-NEG -5.25/-4.75V 8
D/A 16-BIT 16-P-SOIC BICMOS
IC OP AMP PRCN SINGLE 8 PIN PLSTC-SOIC
IC PWR MGT-V-REG-SWG 8 PINS P-SOIC PKG

02632
14543
02037
02910
02910
02037
02037
04078
02037
02910
02910
02910
03406
03406
11302
03285
03285
10858

34907-88801
FM24C04-S
MC74ACT14DR2
74HC32D
74HC574D
MC74ACT132D
MC34182D
LM311D
MC74HC165D
74HC86D
74HC574D
74HC240D
LP339M
LP339M
MAX735CSA
AD1851R
OP177GS
LT1372CS8

4
1
1

DIO TVS BIDIR SMB 600WP 110V SMBJ110C
SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD
CERO-RES 12MHZ +1-0.8%

03287
01380
00830

SMBJ110C
3-822499-1
PBRC-12.0BRN07

Qty

4
4
4

1
1
1
1
6
1
1
1
1
1
2
4

Part Description

Mfr Part Number
9C08052A2610FKR
9C12063AFKR

Chapter 7 Replaceable Parts
34908A 40-Channel Multiplexer

34908A 40-Channel Multiplexer
Reference
Designator
C101-C106
C107
C109
C110
C119-C123
C125
C127
C140-C141
C145
C150
C151-C152
C201-C208
C209

Part
Number
0160-7798
0160-7708
0160-7798
0160-7828
0160-5947
0160-7845
0160-7845
0160-5945
0160-7798
0180-4545
0160-5945
0160-5945
0160-7798

CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 1000pF +-5% 50 V CER C0G
CAP 0.1UF 50V 10% X7R 0805
CAP .1UF 16V 10% X7R
CAP-FXD 1000pF 50 V
CAP FXD 180PF +-5% 50 V CER COG
CAP FXD 180PF +-5% 50 V CER COG
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805
CAP-FXD 4.7uF +-20% 20 V TA
CAP-FXD 0.01uF 50 V
CAP-FXD 0.01uF 50 V
CAP 0.1UF 50V 10% X7R 0805

Mfr
Code
02010
12340
02010
02010
02010
12340
12340
02010
02010
12340
02010
02010
02010

08055C104KAT_A
C0805C102J5GAC
08055C104KAT_A
0603C104KAT
08055C102KATA
C0603C181J5GAC
C0603C181J5GAC
08055C103KATA
08055C104KAT_A
T491B475M020AS
08055C103KATA
08055C103KATA
08055C104KAT_A

CR102
CR104
CR106
CR107
CR201-CR220
CR221-CR222
CR223
CR224-CR225

1906-0395
1902-1574
1902-1574
1906-0291
1906-0291
1906-0395
1906-0291
1906-0395

DIODE-DUAL 75V TO-253
DIODE-ZNR 6.8V 6% TO-236 (SOT-23)
DIODE-ZNR 6.8V 6% TO-236 (SOT-23)
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253
DIODE-DUAL 70V 100MA T0-236AA
DIODE-DUAL 75V TO-253

02910
02910
02910
02910
02910
02910
02910
02910

BAS28
BZX84C6V8
BZX84C6V8
BAV99
BAV99
BAS28
BAV99
BAS28

J101
J102-J104
J106

1252-8024
0360-2624
0360-2624

1
4

CONN-POST TYPE .100-PIN-SPCG-MTG-END
CONN TERMINAL BK RA FEM 12PIN
CONN TERMINAL BK RA FEM 12PIN

05525
13389
13389

26-8477-048-002-025
M1.040.0001.9
M1.040.0001.9

K401-K420
K421
K422

0490-1896
0490-1895
0490-1896

21
1

RLY-2C 2A 220V 60WATT 3V-COIL LATCHING
RLY-2C 2A 220V 60WATT 4.5V COIL
RLY-2C 2A 220V 60WATT 3V-COIL LATCHING

12921
12921
12921

G6SU-2-DC3
G6S-2-DC4.5
G6SU-2-DC3

L101-L103
L105
L109-L115
L150
L152
L400

9170-1663
9170-1584
9170-1584
9170-1584
9170-1584
9170-1663

4
10

CORE-SHIELDING BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHLD BEAD
CORE-SHIELDING BEAD

11702
09808
09808
09808
09808
11702

FBM4532HM132
25Z0805-0SR
25Z0805-0SR
25Z0805-0SR
25Z0805-0SR
FBM4532HM132

Qty
9
1
1
5
2
12
1

5
2
22

Part Description

Mfr Part Number

7

213

Chapter 7 Replaceable Parts
34908A 40-Channel Multiplexer

Reference
Designator
MP1

Part
Qty
Part Description
Number
34901-60001
KIT, MODULE COVER, CASE

Mfr
Code
02362

34901-60001

Q101
Q201
Q202-Q203
Q204
Q205
Q206-Q207
Q208-Q209
Q210
Q211
Q212-Q213
Q214
Q215
Q216-Q217
Q218
Q219
Q220-Q221
Q222-Q223
Q224
Q225
Q226-Q227
Q228
Q229
Q230
Q231
Q232
Q233

1855-1101
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053
1853-0525
1854-1053

1
17
16

TRANSISTOR-MOSFET DUAL P-CHAN E-MODE SI
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)
TRANSISTOR PNP SI TO-236AA PD=200MW
TRANSISTOR NPN SI SOT-23 (TO-236AB)

02037
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125
02237
12125

MMDF2P02E
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A
MMBT2907
KST2222A

R102-R105
R106-R109
R110-R112
R113
R114-R115
R117-R120
R147
R148
R149
R150-R153

0699-3034
0699-3051
0699-3067
0699-3051
0699-3067
0699-2973
0699-3051
0699-3077
0699-3051
0699-3034

12
40
5

RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 14.7K +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1M +-1% .1W TKF TC=0+-100
RESISTOR 10K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100

06337
06337
06337
06337
06337
06337
06337
06337
06337
06337

9C08052A1001FKR
9C08052A1002FKR
9C08052A1472FKR
9C08052A1002FKR
9C08052A1472FKR
9C08052A2150FKR
9C08052A1002FKR
9C08052A1004FKR
9C08052A1002FKR
9C08052A1001FKR

214

4
1

Mfr Part Number

Chapter 7 Replaceable Parts
34908A 40-Channel Multiplexer

Reference
Designator
R154
R156
R166-R168
R170-R180
R181
R182
R185
R201-R233
U101
U102-U105
U109
U141
U150
U151-U152

Part
Number
0699-3947
0699-3947
0699-3034
0699-3044
0699-3034
0699-3932
0699-3932
0699-3051
34901-88822
1820-5752
1820-5941
1821-0055
1818-6821
1821-2382

1
4
1
1
1
2

RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 1K +-1% .063W TKF TC=0+-200
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 4.64K +-1% .1W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
RESISTOR 215 +-1% .063W TKF TC=0+-200
RESISTOR 215 +-1% .063W TKF TC=0+-200
RESISTOR 10K +-1% .1W TKF TC=0+-100
PRGM’D 1821-1876
IC FF CMOS/HC D-TYPE POS-EDGE-TRIG COM
IC DCDR-DEMUXR CMOS/ACT BIN 8-TO-1-LINE
IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP
FRAM SERIAL 4K FMZ4C04-S
IC-INTERFACE MISC BIPOLAR 9-BIT

Mfr
Code
06337
06337
06337
06337
06337
06337
06337
06337
02632
02910
03406
02037
14543
12186

9C0603A1001FL
9C0603A1001FL
9C08052A1001FKR
9C08052A4641FKR
9C08052A1001FKR
9C0603A2150FL
9C0603A2150FL
9C08052A1002FKR
34901-88822
74HC574D
74ACT138SC
MC74ACT132D
FM24C04-S
DS1620S

XU101

1200-1592

1

SOCKET-IC-PLCC 44-CONT SQUARE J-LEAD

01380

3-822499-1

Y101

0410-4009

1

CERO-RES 12MHZ +1-0.8%

00830

PBRC-12.0BRN07

Qty
2

11
2

Part Description

Mfr Part Number

7

215

Chapter 7 Replaceable Parts
Manufacturer’s List

Manufacturer’s List
Mfr Code

Mfr Name

City

State

Country

CA

US

00039

NEC ELECTRONICS INC

MTN VIEW

00746

ROHM CORP

KYOTO 615

00830

KYOCERA AMERICA, INC

SAN DIEGO

CA

US

01380

AMP INC

HARRISBURG

PA

US

01542

DIV 01 SAN JOSE COMPONENTS

SAN JOSE

CA

US

JP

01642

SONS TOOL INC

WOODVILLE

WI

US

01698

TEXAS INSTRUMENTS INC

DALLAS

TX

US

01850

AROMAT CORP

MOUNTAINSIDE

NJ

US

02010

AVX CORP

GREAT NECK

NY

US

02037

MOTOROLA INC

ROSELLE

IL

US

02194

ROBINSON NUGENT INC

NEW ALBANY

IN

US

02237

FAIRCHILD SEMICONDUCTOR

SOUTH PORTLAND

ME

US

KEYSIGHT TECHNOLOGIES

LOVELAND

CO

US

02499

INTERNATIONAL RESISTIVE CO.

BOONE

NC

US

02883

TEMIC/SILICONIX INC

SANTA CLARA

CA

US

02910

PHILIPS SEMICONDUCTORS

EINDHOVEN

03038

INTL RECTIFIER CORP

LOS ANGELES

CA

US

03285

ANALOG DEVICES INC

NORWOOD

MA

US

03287

GENERAL SEMICONDUCTOR IND INC

TEMPE

AZ

US

03292

CORNING GLASS WORKS

CORNING

NY

US

03406

NATIONAL SEMICONDUCTOR CORP

SANTA CLARA

CA

US

03418

MOLEX INC

LISLE

IL

US

03677

AMERICAN MICRO SYSTEMS INC

SANTA CLARA

CA

US

03744

BOURNS NETWORKS INC

RIVERSIDE

CA

US

03811

INTEL CORP

SANTA CLARA

CA

US

03827

02361/2

NL

FAIR RITE PRODUCTS CORP

WALLKILL

NY

US

04078

SGS-THOMSON MICROELECTRONICS INC

PHOENIX

AZ

US

04501

COTO WABASH

PROVIDENCE

RI

US

04504

GENERAL INSTRUMENT CORP

CHICAGO

IL

US

04670

JOHNSON COMPONENTS INC

WASECA

MN

US

04726

3M CO

ST PAUL

MN

US

216

Chapter 7 Replaceable Parts
Manufacturer’s List

Mfr Code

State

Country

04733

BELL INDUSTRIES INC MILLER JW DIV

Mfr Name
GARDENA

City

CA

US

05176

AMERICAN SHIZUKI CORP

CANOGA PARK

CA

US

05524

VISHAY INTERTECHNOLOGY INC

MALVERN

PA

US

05525

ELCO CORP

NEWPORT BEACH

CA

US

05535

KEYSTONE ELECTRONICS CORP

NEW YORK

NY

US

05951

WICKMANN-WERKE A G

WITTEN-ANNEN

DE

06121

SIEMENS AG

MUNICH

DE

06337

PHILIPS ELECTRONICS NV

EINDHOVEN

NL

06352

TDK CORPORATION OF AMERICA

SKOKIE

06360

NIPPON CHEMI-CON CORP

OHME-SHI TOKYO

IL

US
JP

06916

SONY CORP

TOYKO

07179

AAVID THERMAL TECHNOLOGY INC

LACONIA

JP

07371

SANYO ELECTRIC INC

MORIGYCHI

08709

MATSUSHITA ELECTRIC CORPORATION OF

SECAUCUS

NJ

US

09235

FOX ELECTRONICS

FT MEYERS

FL

US

NH

US
JP

09454

PRECISION RESISTIVE PRODS INC

MEDIAPOLIS

IA

US

09808

STEWARD INC

CHATTANOOGA

TN

US

09891

KOA CORPORATION

INA-SHI NAGANO-KEN

09939

MURATA ELECTRONICS NORTH AMERICA, INC.

LONG BEACH

CA

US

10421

EPSON AMERICA INC

TORRENCE

CA

US

JP

10858

LINEAR TECHNOLOGY CORP

MILPITAS

CA

US

11302

MAXIM INTEGRATED PRODUCTS

SUNNYVALE

CA

US

11484

JOSLYN ELECTRONIC SYSTEMS DIV

GOLETA

CA

US

11702

TAIYO YUDEN CO LTD

TOKYO 110

JP

11908

NORITAKE CO LTD

NISHI-KU - NAGOYA

JP

12125

SAMSUNG SEMICONDUCTOR INC

SANTA CLARA

CA

US

12186

DALLAS SEMICONDUCTOR CORP

DALLAS

TX

US

12340

KEMET ELECTRONICS CORPORATION

GREENVILLE

SC

US

12768

SEIKO EPSON CORP

NAJANO-KEN TOKYO

JP

12921

OMRON JAPAN

KYOTO

JP

13389

WIELAND INC

ROCHELLE

NY

US

14543

RAMTRON

COLORADO SPRINGS

CO

US

7

217

Chapter 7 Replaceable Parts
Manufacturer’s List

218

8

8

Schematics

Schematics
This chapter contains a block diagram, schematics, and component
locator drawings for the instrument and all plug-in modules. The block
diagram and schematics support the Theory of Operation in chapter 5.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

Keysight 34970A System Block Diagram, o n page 221
A1 Component Locators, starting on page 222
A1 Schematics, starting on page 224
A2 Display and Keyboard Component Locator, on page 228
A2 Display and Keyboard Schematic, on page 229
A3 Backplane Component Locator, o n page 230
A3 Backplane Schematic, o n page 231
A4 Internal DMM Component Locators, starting o n page 232
A4 Internal DMM Schematics, starting o n page 234
34901A 20-Channel Multiplexer Component Locator, on page 238
34901A 20-Channel Multiplexer Schematics, starting on page 239
34902A 16-Channel Multiplexer Component Locator, on page 244
34902A 16-Channel Multiplexer Schematics, starting on page 245
34903A 20-Channel Actuator Component Locator, o n page 249
34903A 20-Channel Actuator Schematics, starting o n page 250
34904A 4x8 Matrix Component Locator, o n page 253
34904A 4x8 Matrix Schematics, starting o n page 254
34905A/34906A RF Multiplexer Component Locator, on page 257
34905A/34906A RF Multiplexer Schematics, starting o n page 258
34907A Multifunction Module Component Locator, on page 260
34907A Multifunction Module Schematics, starting on page 261
34908A 40-Channel Multiplexer Component Locator, on page 266
34908A 40-Channel Multiplexer Schematics, starting on page 267

220

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Keysight 34970A System Block Diagram
221

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34970-66501 (sheet 1 of 2)
A1 Component Locator (top)
222

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34970-66501 (sheet 2 of 2)
A1 Component Locator (bottom)
223

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34970-66501 (sheet 1 of 4)
A1 Power Supply Schematic
224

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34970-66501 (sheet 2 of 4)
A1 Floating Logic Schematic
225

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34970-66501 (sheet 3 of 4)
A1 Earth Referenced Logic Schematic
226

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34970-66501 (sheet 4 of 4)
A1 Memory Schematic
227

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34970-66502 (sheet 1 of 1)
A2 Display and Keyboard Component Locator (top)
228

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34970-66502 (sheet 1 of 1)
A2 Display and Keyboard Schematic
229

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34970-66503 (sheet 1 of 1)
A3 Backplane Component Locator
230

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34970-66503 (sheet 1 of 1)
A3 Backplane Schematic
231

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34970-66504 (sheet 1 of 2)
A4 Internal DMM Component Locator (top)
232

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34970-66504 (sheet 2 of 2)
A4 Internal DMM Component Locator (bottom)
233

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Note: The DIAG:DMM:CYCLes? command
returns three numbers indicating the cycle
count on backplane relays “1”, “2”, and “3”
(which correspond to relays K102, K103,
and K104 respectively). See chapter 5 in
the User’s Guide for more information.

34970-66504 (sheet 1 of 4)
A4 Input and Protection Schematic
234

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34970-66504 (sheet 2 of 4)
A4 Input Amplifier and Ohms Current Schematic
235

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34970-66504 (sheet 3 of 4)
A4 AC Schematic
236

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34970-66504 (sheet 4 of 4)
A4 A/D Converter Schematic
237

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34901-66501 (sheet 1 of 1)
34901A 20-Channel Multiplexer Component Locator
238

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34901-66501 (sheet 1 of 5)
34901A 20-Channel Multiplexer Schematic
239

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34901-66501 (sheet 2 of 5)
34901A 20-Channel Multiplexer Schematic
240

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34901-66501 (sheet 3 of 5)
34901A 20-Channel Multiplexer Schematic
241

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34901-66501 (sheet 4 of 5)
34901A 20-Channel Multiplexer Schematic
242

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34901-66501 (sheet 5 of 5)
34901A 20-Channel Multiplexer Schematic
243

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34902-66501 (sheet 1 of 1)
34902A 16-Channel Multiplexer Component Locator
244

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34902-66501 (sheet 1 of 4)
34902A 16-Channel Multiplexer Schematic
245

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34902-66501 (sheet 2 of 4)
34902A 16-Channel Multiplexer Schematic
246

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34902-66501 (sheet 3 of 4)
34902A 16-Channel Multiplexer Schematic
247

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34902-66501 (sheet 4 of 4)
34902A 16-Channel Multiplexer Schematic
248

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34903-66501 (sheet 1 of 1)
34903A 20-Channel Actuator Component Locator
249

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34903-66501 (sheet 1 of 3)
34903A 20-Channel Actuator Schematic
250

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34903-66501 (sheet 2 of 3)
34903A 20-Channel Actuator Schematic
251

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34903-66501 (sheet 3 of 3)
34903A 20-Channel Actuator Schematic
252

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34904-66501 (sheet 1 of 1)
34904A 4x8 Matrix Component Locator
253

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34904-66501 (sheet 1 of 3)
34904A 4x8 Matrix Schematic
254

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34904-66501 (sheet 2 of 3)
34904A 4x8 Matrix Schematic
255

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34904-66501 (sheet 3 of 3)
34904A 4x8 Matrix Schematic
256

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34905-66501/34906-66501 (sheet 1 of 1)
34905A/34906A RF Multiplexer Component Locator
257

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34905-66501/34906-66501 (sheet 1 of 2)
34905A/34906A RF Multiplexer Schematic
258

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34905-66501/34906-66501 (sheet 2 of 2)
34905A/34906A RF Multiplexer Schematic
259

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34907-66501 (sheet 1 of 1)
34907A Multifunction Module Component Locator
260

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34907-66501 (sheet 1 of 5)
34907A Multifunction Module Schematic
261

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34907-66501 (sheet 2 of 5)
34907A Multifunction Module Schematic
262

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34907-66501 (sheet 3 of 5)
34907A Multifunction Module Schematic
263

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34907-66501 (sheet 4 of 5)
34907A Multifunction Module Schematic
264

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34907-66501 (sheet 5 of 5)
34907A Multifunction Module Schematic
265

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34908-66501 (sheet 1 of 1)
34908A 40-Channel Multiplexer Component Locator
266

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34908-66501 (sheet 1 of 3)
34908A 40-Channel Multiplexer Schematic
267

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

34908-66501 (sheet 2 of 3)
34908A 40-Channel Multiplexer Schematic
268

Fold Here

Fold Here

Õ

Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

34908-66501 (sheet 3 of 3)
34908A 40-Channel Multiplexer Schematic
269

Ô Binder Edge (RH Page)

Foldout Cut Size = 9 x 19 inches

Fold Here

Fold Here

Factory Reset State

1

Specifications

The table below shows the state of the instrument after a FACTORY RESET
from the Sto/Rcl menu or *RST command from the remote interface.

2

3

4

Quick Start

Front-Panel
Overview

Calibration
Procedures

Measurement Configuration
Function
Range
Resolution
Integration Time
Input Resistance
Channel Delay
Totalizer Reset Mode
Totalizer Edge Detect

Factory Reset State
DC Volts
Autorange
51⁄2 digits
1 PLC
10 MΩ (fixed for all DCV ranges)
Automatic Delay
Count Not Reset When Read
Rising Edge

Scanning Operations
Scan List
Reading Memory
Min, Max, and Average
Scan Interval Source
Scan Interval

Factory Reset State
Empty
All Readings are Cleared
All Statistical Data is Cleared
Immediate
Front Panel = 10 Seconds
Remote = Immediate
Front Panel = Continuous
Remote = 1 Scan Sweep
Reading Only (No Units, Channel, Time)
Stopped

Scan Count
Scan Reading Format
Monitor in Progress

5

6

7

8

Theory of
Operation

Mx+B Scaling
Gain Factor (“M”)
Scale Factor (“B”)
Scale Label

Factory Reset State
1
0
Vdc

Service

Alarm Limits
Alarm Queue
Alarm State
HI and LO Alarm Limits
Alarm Output
Alarm Output Configuration
Alarm Output State
Alarm Output Slope

Factory Reset State
Not Cleared
Off
0
Alarm 1
Latched Mode
Output Lines are Cleared
Fail = Low

Replaceable
Parts

Module Hardware
34901A, 34902A, 34908A
34903A, 34904A
34905A, 34906A
34907A

Factory Reset State
Reset: All Channels Open
Reset: All Channels Open
Reset: Channels s11 and s21 Selected
Reset: Both DIO Ports = Input, Count = 0,
Both DACs = 0 Vdc

System-Related Operations
Display State
Error Queue
Stored States

Factory Reset State
On
Errors Not Cleared
No Change

Schematics

Inside of Rear Cover Flap (Service Guide)

This information is subject to change without notice.
© Keysight Technologies 1997 - 2015
Edition 7, February 2015

*34970-90012*
34970-90012
www.keysight.com

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34970 90012 Keysight Service Guide 2

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