Agilent Technologies 34980A Service Manual Page 104
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92 34980A Service Guide
4 Troubleshooting and Diagnostics
34921A 40-Channel Armature Multiplexer with Low Thermal Offset
The 34921A 40- Channel Armature Multiplexer (40- Ch Arm MUX) is
divided into two banks with 20 latching armature switches (channels 1- 20
and 21- 40) in each. This module also offers four additional fused relays
(channels 41- 44) for making AC and DC current measurements with the
internal DMM with no external shunts needed. These current channels
feature “make- before- break” connections to ensure continuous current flow
when switching from one current channel to another. The current fuses
are replaceable.
This module also contains nine armature Analog Bus relays (channels 911-
914, 921- 924, and 931), four on each bank that can connect the bank
relays to the system Analog Buses and one that connects the current
relays to the current input of the DMM. Through ABus1 and ABus2 you
can connect any of the channels to the internal DMM for voltage or
resistance measurements. Refer to the simplified schematic below.
- Agilent 34980A 1
- Multifunction 1
- Switch/Measure Unit 1
- Additional Safety Notices 3
- Front Panel at a Glance 5
- Rear Panel at a Glance 6
- Rear Panel Connector Pinouts 7
- Front Panel Menu Reference 9
- Advanced 10
- Instrument Rack Mounting 11
- 367.7 mm (14.48 in) 12
- 101.9 mm (4.01 in) 12
- or 12
- 70.4 mm (2.78 in) 12
- 425.6 mm (16.76 in) 12
- Contents 13
- 3 Calibration Procedures 14
- 5 Disassembly and Repair 15
- 7 Backdating 16
- Obtaining Service 17
- Repackaging for Shipment 19
- Cleaning 19
- Self Test Procedures 20
- Obtaining Service 1 21
- 34980A Service Guide 9 21
- 1 Obtaining Service 22
- Specifications 23
- 2 Specifications 24
- Configurable by bank 33
- C or CAL:MOD? ± 5C 34
- ±(% of reading + % of range) 39
- Temperature Specifications 40
- Typical System Speeds 41
- –40°C to 70°C 47
- Product Dimensions 48
- Specifications 2 51
- 34980A Service Guide 39 51
- 34980A Service Guide 41 53
- (for the 100 mV, 1 V 53
- Calibration Procedures 55
- Calibration Procedures 3 57
- 34980A Service Guide 45 57
- Recommended Test Equipment 58
- Calibration Security 59
- Calibration Message 60
- Calibration Count 60
- Calibration Process 61
- Self-Test 62
- Quick Performance Check 63
- insulated 64
- DMM Test Considerations 65
- Zero Offset Verification 66
- of error for the relay 67
- Gain Verification 68
- Zero Adjustment Procedure 73
- Gain Adjustment 74
- –100 kHz 75
- Gain Adjustment Procedure 76
- Plug-in Modules 78
- 34980A Service Guide 67 79
- 34951A Verification 80
- Analog Output Adjustment 83
- 34952A Multifunction Module 84
- Relay Plug-in Modules 86
- 34980A Service Guide 75 87
- Agilent Technologies 89
- Unit seems inoperative 90
- Isolating to an assembly 90
- Unit fails self-test 90
- Power Supply 91
- Product Firmware Updates 91
- Instrument Errors 92
- Front-Panel Operation 93
- Remote Interface Operation 93
- Error Numbers 94
- Self-Test Errors 97
- Calibration Errors 98
- Firmware Update Errors 99
- Plug-In Module Errors 100
- Relay and FET Replacement 103
- 92 34980A Service Guide 104
- 94 34980A Service Guide 106
- 96 34980A Service Guide 108
- 98 34980A Service Guide 110
- 100 34980A Service Guide 112
- 102 34980A Service Guide 114
- 104 34980A Service Guide 116
- Two-Wire Mode 119
- One-Wire Mode 119
- 34933A Two-Wire Mode 120
- 34933A One-Wire Mode 121
- 34937A 32-Channel GP Switch 123
- Disassembly and Repair 125
- Surface Mount Repair 126
- Tools Required 126
- Basic Disassembly 127
- in the mainframe as shown 128
- Power Supply Disassembly 129
- KOM Removal 130
- Front Panel Removal 131
- Front Panel Disassembly 132
- DMM Removal 133
- Backplane Removal 134
- Replaceable Parts 135
- Mainframe Replaceable Parts 137
- 34921A Replaceable Parts 138
- 34922A Replaceable Parts 138
- 34923A Replaceable Parts 139
- 34924A Replaceable Parts 139
- 34925A Replaceable Parts 139
- 34931A Replaceable Parts 140
- 34932A Replaceable Parts 141
- 34933A Replaceable Parts 142
- 34937A Replaceable Parts 142
- 34938A Replaceable Parts 142
- Vendor Addresses 143
- 6 Replaceable Parts 144
- Backdating 145
- Diagrams 147
- 34921A Component Locator 148
- 34922A Component Locator 149
- 34923A Component Locator 150
- 34924A Component Locator 151
- 8 Diagrams 152
- Diagrams 8 153
- 34980A Service Guide 141 153
- 34931A Component Locator 154
- 34932A Component Locator 155
- 34933A Component Locator 156
- 34937A Component Locator 157
- 34938A Component Locator 158
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