Calibration Procedures 3
Keysight 34980A Service Guide 65
– On the RF Multiplexer modules (34941A, 34942A), the signal path to the COM
terminal consists of both a channel relay and a bank relay. For each bank, the
module stores the cycle count for each channel relay, the bank relay, and
returns the greater of the two. For example, to determine the cycle count on
Channel 11, the module recalls the count on Channel 11, the count on the
Bank 1 relay, and returns the greater of the two. In addition, the cycle count on
the two channels within the same physical relay package, will always be equal.
Therefore, the cycle count for Channels 11 and 12 will always be equal.
Use the DIAGnostic:RELay:CYCLes? (@<ch_list>) command to read relay
cycle counts on the following modules:
– 34921A through 34925A Multiplexer Modules
– 34931A through 34933A Matrix Modules
– 34937A and 34938A GP Switch Modules
– 34941A and 34942A RF Multiplexer Modules
– 34946A and 34947A Microwave Switch Modules
Use the DIAGnostic:DMM:CYCLes? {1|2|3|4|5|6} command to read relay
cycle counts for the internal DMM function and range relays.
By maintaining a count you can estimate which relays are nearing the end of their
useful life.
Relay Contact Resistance Verification (Optional)
The Keysight Y1131A Verification/Diagnostic Software Kit 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.
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