Troubleshooting and Diagnostics 4
34980A Service Guide 93
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 Agilent Y1131A Verification/Diagnostic Software Kit is a recommended tool and
contains software and hardware used to test the relay switching modules available for the
Agilent 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.
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