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911
912
913
914
041
042
Current Backplane
931
*The current switches use two relays to create a "make-before-break" circuit. You should replace both relays.
34922A 70-Channel Armature Multiplexer
The high-density 34922A 70-Channel Armature Multiplexer (70-Ch Arm MUX) is
divided into two banks with 35 latching armature switches (channels 1-35 and
36-70) in each. This module also contains eight armature Analog Bus relays
(channels 911-914 and 921-924), four on each bank that can connect the bank
relays to the system Analog Buses. 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.
Keysight 34980A Service Guide
Bank 1
Backplane
K911
K912
K913
K914
Current*
K841, K841S, F1041
K842, K842S, F1042
K931
Troubleshooting and Diagnostics
Bank 2
Backplane
921
922
923
924
Current*
043
K843, K843S, F1043
044
K844, K844S, F1044
4
K921
K922
K923
K924
85
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