Contents

Front Panel at a Glance iii

Rear Panel at a Glance iv

Rear Panel Connector Pinouts

v

Annunciator Display Indicators vi

Front Panel Menu Reference vii

Instrument Rack Mounting

vii

1 Obtaining Service

Operating Checklist

6

Types of Service Available

6

Repackaging for Shipment 7

Cleaning

7

Self Test Procedures

8

Electrostatic Discharge (ESD) Precautions 9

2 Specifications

Multiplexer Module Specifications and Characteristics 12

Matrix Modules Specifications and Characteristics

14

GP Actuator Module Specifications and Characteristics 16

RF and Microwave Module Specifications and Characteristics 17

34945A/34945EXT Module Specifications and Characteristics 19

34950A 64-channel Digital I/O Specifications and Characteristics 20

34951A 4-channel D/A Converter Specifications and Characteristics

22

34952A Multifunction Module Specifications and Characteristics 24

34959A Breadboard Module Specifications and Characteristics 25

Internal DMM Specifications and Characteristics 26

Typical System Speeds 29

Internal DMM Measurement Characteristics 31

System Specifications and Characteristics 35

Product Dimensions

37

To Calculate Total DMM Measurement Error

38

Interpreting Internal DMM Specifications 40

Configuring for Highest Accuracy Measurements 42

34980A Service Guide 1

2

3 Calibration Procedures

Agilent Technologies Calibration Services

44

Calibration Interval

44

Adjustment is Recommended 44

Time Required for Calibration

45

Automating Calibration Procedures

45

Recommended Test Equipment 46

Calibration Security

47

Calibration Message 48

Calibration Count

48

Calibration Process 49

Aborting a Calibration in Progress 49

Performance Verification Tests 50

Input Connections

52

DMM Test Considerations

53

Internal DMM Verification Tests

53

Optional AC Performance Verification Tests 59

Internal DMM Adjustments 60

Gain Adjustment 61

Plug-in Module Test Considerations

65

34951A 4-Ch Isolated DAC Module 66

34952A Multifunction Module

71

Relay Plug-in Modules 73

Thermocouple Reference Junction 34921A (Optional) 75

34980A Service Guide

4 Troubleshooting and Diagnostics

Troubleshooting Hints

78

Power Supply 79

Product Firmware Updates 79

Instrument Errors 80

Error Numbers 82

Isolate a Problem with a Plug-In Module

90

Relay and FET Replacement 91

34921A 40-Channel Armature Multiplexer with Low Thermal Offset 92

34922A 70-Channel Armature Multiplexer

94

34923A 40/80-Channel Reed Multiplexer 96

34924A 70-Channel Reed Multiplexer 98

34925A 40/80-Channel Optically-Isolated FET Multiplexer 100

34931A Dual 4x8 Armature Matrix

102

34932A Dual 4x16 Armature Matrix 104

34933A Dual/Quad 4x8 Reed Matrix

107

34937A 32-Channel GP Switch

111

34938A 20-Channel High-Current GP Switch 112

5 Disassembly and Repair

Electrostatic Discharge (ESD) Precautions

114

Surface Mount Repair

114

Tools Required 114

Basic Disassembly 115

Power Supply Removal

116

Power Supply Disassembly

117

KOM Removal

118

Front Panel Removal 119

Front Panel Disassembly 120

DMM Removal 121

Backplane Removal

122

34980A Service Guide 3

4

6 Replaceable Parts

To Order Replaceable Parts

124

Backdating and Part Changes

124

Mainframe Replaceable Parts 125

34921A Replaceable Parts 126

34922A Replaceable Parts 126

34923A Replaceable Parts 127

34924A Replaceable Parts 127

34925A Replaceable Parts 127

34931A Replaceable Parts 128

34932A Replaceable Parts 129

34933A Replaceable Parts 130

34937A Replaceable Parts 130

34938A Replaceable Parts 130

34946A and 34947A Replaceable Parts 131

Vendor Addresses

131

7 Backdating

8 Diagrams

34921A Component Locator

136

34922A Component Locator

137

34923A Component Locator

138

34924A Component Locator

139

34925A Component Locator (Top) 140

34925A Component Locator (Bottom) 141

34931A Component Locator

142

34932A Component Locator

143

34933A Component Locator

144

34937A Component Locator

145

34938A Component Locator

146

34980A Service Guide