96 34980A Service Guide
4 Troubleshooting and Diagnostics
34923A 40/80-Channel Reed Multiplexer
The 34923A 40/80- Channel Reed Multiplexer (40/80- Ch Reed MUX) is
divided into two equal banks of non- latching reed switches. 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. You can connect any of the channels to the internal
DMM through ABus1 and ABus2 for voltage or resistance measurements.
Using program commands or the mainframe front panel, you can control
each of the channel switches individually, and configure this module for
differential (2- wire or 4- wire) or single- ended (1- wire) mode. Refer to the
simplified schematic for two- or four- wire modes.
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