3 Performance Verification
88 Keysight DAQ970A/DAQ973A Service Guide
12 For each test, close only the channels shown in the “Channels Closed” column
below. Record the 4-wire ohms measurements from the external DMM in the
following table.
DAQM904A 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 DAQM904A. 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 all copper shorts between H and L on all columns.
2 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.
3 Measure the resistance from row 1 H terminal to all eight column’s H
terminals. Ensure that they are “open” or more than 10 MW. Repeat this step
for all the other three rows.
4 Repeat step 3 for L terminals.
Test #
Channel closed
[a]
[a] Only the channel currently under test should be closed at one time. All other channels should be open.
Measured value Test limit Relay measured
25 Channel 41 ____________ W 2.00 W K401
26 Channel 42 ____________ W 2.00 W K402
27 Channel 43 ____________ W 2.00 W K403
28 Channel 44 ____________ W 2.00 W K404
29 Channel 45 ____________ W 2.00 W K405
30 Channel 46 ____________ W 2.00 W K406
31 Channel 47 ____________ W 2.00 W K407
32 Channel 48 ____________ W 2.00 W K408
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