96 34980A Service Guide
4 Troubleshooting and Diagnostics
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.
For the 34922A, relay part numbers are given on page 128 and the component locator is
shown on page 139. The table on the next page shows the relationship of channel
numbers to relay numbers.
Bank 1 Bank 2
Channel Relay Channel Relay
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