Daqm901A Relay Contact Resistance Verification (Optional) - Keysight Technologies DAQ970A Service Manual

3 Remove the module from the DAQ970A/DAQ973A mainframe. Retain the
4 Plug the module back into the DAQ970A/DAQ973A mainframe. Perform a

DAQM901A relay contact resistance verification (optional)

This procedure checks the relay contact resistance for the relays used in Channel
01 to 20 on the DAQM901A. 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.
Ensure that you have read the
NOTE
1 Connect the copper shorts from H to L for each channel, from Channel 01 to
2 Perform a 2-wire resistance measurement for each channel using the
3 Remove the module from the DAQ970A/DAQ973A mainframe. Retain the
4 Plug the module back into the DAQ970A/DAQ973A mainframe. Perform a
Keysight DAQ970A/DAQ973A Service Guide
copper shorts connected in step 1, and add another wire between Channel 01
L and Channel 11 L.
4-wire resistance measurement for Channel 01 using the DAQ970A's/
DAQ973A's internal DMM. Ensure that all measurements are less than 2 W.
Channel 20.
DAQ970A/DAQ973A's internal DMM. Ensure that all measurements are less
than 2 W.
copper shorts in connected in step 1, and add another wire between Channel
01 L and Channel 11 L.
4-wire resistance measurement for Channel 01 using DAQ970A/DAQ973A's
internal DMM. Ensure that all measurements are less than 2 W.
Performance Verification
"Plug-in Module Test Considerations"
3
on page 76.
79