Performance Verification 3
Keysight DAQ970A/DAQ973A Service Guide 81
DAQM901A 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 DAQM901A. 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 Open all channels on the module by performing a Card Reset (press [Module]
select Card Reset; then press Yes to confirm). Remove the module from the
DAQ970A/DAQ973A mainframe.
2 Measure the resistance from COM1 H terminal to Channel 01 to 10 H
terminals. Ensure that they are “open” or more than 10 MW. Repeat for L
terminals.
3 Measure the resistance from COM2 H terminal to Channel 11 to 20 H
terminals. Ensure that they are “open” or more than 10 MW. Repeat for L
terminals.
4 Measure the resistance from COM1 H terminal to COM2 H terminal. Ensure
that they are “open” or more than 10 MW. Repeat for L terminals.
5 K522 connects AMPS COM to Channel 21 after the reset. Measure the
resistance from AMPS COM H to CH22 H. Ensure that they are “open” or more
than 10 MW. Repeat for L terminals.
6 Plug the module back into the DAQ970A/DAQ973A mainframe. Set Channel
22 to measure DCI or ACI. Press [Monitor].
7 Remove the module from the DAQ970A/DAQ973A mainframe without
powering down the mainframe. K522 should retain its connection of AMPS
COM to Channel 22.
8 Measure the resistance from AMPS COM H to CH21 H. Ensure that they are
“open” or more than 10 MW. Repeat for L terminals.
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