3 Performance Verification
78 Keysight DAQ970A/DAQ973A Service Guide
Relay Verification
The following topics are covered in this section:
– “DAQM900A solid state relay on-resistance verification (optional)” on page 78
– “DAQM901A relay contact resistance verification (optional)” on page 79
– “DAQM901A shorted relay contact verification” on page 81
– “DAQM902A relay contact resistance verification (optional)” on page 82
– “DAQM902A shorted relay contact verification” on page 83
– “DAQM903A relay contact resistance verification (optional)” on page 83
– “DAQM903A shorted relay contact verification” on page 84
– “DAQM904A relay contact resistance verification (optional)” on page 85
– “DAQM904A shorted relay contact verification” on page 88
– “DAQM905A relay verification (optional)” on page 89
– “DAQM908A relay contact resistance verification (optional)” on page 90
– “DAQM908A shorted relay contact verification” on page 90
DAQM900A solid state relay on-resistance verification (optional)
This procedure checks the relay contact resistance for relays used in Channel 01
to 20 on the DAQM900A. 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 20.
2 Perform 2-wire resistance measurements for each channel using the
DAQ970A/DAQ973A’s internal DMM. Ensure that all measurements are less
than
100 W.
NOTE
Ensure that you have read the “Plug-in Module Test Considerations” on page 76.
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