Agilent Technologies 34980A Service Manual Page 103

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Troubleshooting and Diagnostics 4
34980A Service Guide 91
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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