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Low Frequency Multiplexer Switch Modules 4
34980A User’s Guide 103
Low thermal offset voltage makes the 34921A ideal for low- level signal
switching. The 34921T optional terminal block provides a built-in
thermocouple reference junction that helps minimize errors due to
thermal offset when you measure thermocouples.
This module has capability to scan as many as 100 channels/second
using the internal DMM. With the automatic “break-before-make”
connection operation, you are assured that no two signals are connected
to each other during a scan. When using the module in a non-scanning
mode, you can close as many channels as you wish.
This module is safety interlock protected, which means whenever the
D-sub connector end of the modules is exposed, the Analog Bus relays
automatically open and disconnect from the Analog Bus. For more
information, refer to page 96 and page 105.
When power is off, all channel relays maintain state, and the Analog Bus
relays open.