Relay And Fet Replacement - Keysight Technologies 34980A Service Manual

4 Troubleshooting and Diagnostics

Relay and FET Replacement

Failing relays and FET switches can be isolate to a specific channel and replaced.
There are two methods you can use to verify relays and switches:
– Read the relay cycle count.
– Measure the relay contact resistance.
The Keysight Y1131A Verification/Diagnostic Software Kit is a recommended tool
and contains software and hardware used to test the relay switching modules
available for the Keysight 34980A Multifunction Switch/Measure Unit. The
software provides module–specific tests to assist you with troubleshooting
possible relay failures and predicting system maintenance requirements. Custom
terminal blocks are provided to route signals and isolate individual relays for
verification and diagnostics.
For several of the relay switching modules, it is very difficult to isolate a particular
channel. The Y1131A Verification/Diagnostic Software used in conjunction with
the provided verification terminal blocks attempts to isolate measurement
channels in a repeatable manner.
82 Keysight 34980A Service Guide