Troubleshooting and Diagnostics 4
Keysight 34980A Service Guide 83
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.
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