98 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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