Daqm902A Shorted Relay Contact Verification; Daqm903A Relay Contact Resistance Verification (Optional) - Keysight Technologies DAQ970A Service Manual

DAQM902A shorted relay contact verification

This procedure uses an external DMM to make 2-wire ohms measurements across
all H terminals, followed by all L terminals, on the DAQM902A. As this is to verify
open or shorts only, measurement accuracy is not required, so a 2-wire ohms
measurement with handheld test probes is sufficient.
1 Remove the module from the DAQ970A/DAQ973A mainframe. You do not need
2 Measure the resistance from COM1 H terminal to Channel 01 to 10 H
3 Measure the resistance from COM2 H terminal to Channel 11 to 20 H
4 Measure the resistance from COM1 H terminal to COM2 H terminal. Ensure

DAQM903A relay contact resistance verification (optional)

This optional procedure uses an external DMM to make 4-wire ohms
measurements across the relay contacts on the DAQM903A.
1 Be sure to read
2 Install the DAQM903A module in slot 100. Close Channels 01 through 20.
3 Measure the resistance from the CM terminal to the NO terminal on each
4 Install the module in slot 100. Open Channel 01 through 20.
5 Measure the resistance from the CM terminal to the NC terminal on each
Keysight DAQ970A/DAQ973A Service Guide
to perform a Card Reset to open all channels as the relays will automatically
open once the module is removed from the mainframe.
terminals. Ensure that they are "open" or more than 10 MW. Repeat for L
terminals.
terminals. Ensure that they are "open" or more than 10 MW. Repeat for L
terminals.
that they are "open" or more than 10 MW. Repeat for L terminals.
"Plug-in Module Test Considerations"
Remove the module from the DAQ970A/DAQ973A.
channel. Ensure that all measurements are less than 1 Ω.
Remove the module from the DAQ970A/DAQ973A.
channel. Ensure that all measurements are less than 1 Ω.
Performance Verification
on page 76.
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