3 Performance Verification
82 Keysight DAQ970A/DAQ973A Service Guide
DAQM902A relay contact resistance verification (optional)
This procedure checks the relay contact resistance for relays used in Channel 01
to 16 on the DAQM902A. It uses the internal DMM of the DAQ970A/DAQ973A to
make resistance measurements. To ensure accurate measurements, the
DAQ970A/DAQ973A has to be calibrated prior to this procedure.
1 Connect copper shorts from H to L for each channel, from Channel 01 to
Channel 16.
2 Perform a 2-wire resistance measurement for each channel using the
DAQ970A’s/DAQ973A’s internal DMM. Ensure that all measurements are less
than 2 W.
3 Remove the module from the DAQ970A/DAQ973A mainframe. Retain the
copper shorts in connected in step 1, and add another wire between Channel
01 L and Channel 09 L.
4 Plug the module back into the DAQ970A/DAQ973A mainframe. Perform a
4-wire resistance measurement for Channel 01 using the DAQ970A‘s/
DAQ973A’s internal DMM. Ensure that all measurements are less than 2 W.
NOTE
Ensure that you have read the “Plug-in Module Test Considerations” on page 76.
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