Daqm905A Relay Verification (Optional) - Keysight Technologies DAQ970A Service Manual

DAQM905A relay verification (optional)

This optional procedure uses an external DMM to check that the RF relay is
functioning, using 2-wire ohms measurement with handheld test probes.
1 Be sure to read
2 Prepare the module by connecting an SMB short to CH10, CH11, CH12, and
3 Install the module in slot 100.
4 Close Channel 11.
5 Measure the resistance on the DMM. Ensure that measurements is less than
6 Close all othe channels.
7 Measure the resistance, ensure that they are "open" or more than 10 MΩ.
8 Repeat steps 4 and 7 for Channels 12, 13, and 14.
9 Repeat steps 2, 3, 4, 5, 6, 7, and 8 for the channels connected to COM2.
Keysight DAQ970A/DAQ973A Service Guide
"Plug-in Module Test Considerations"
CH13. Connect the COM1 terminal to the DMM.
Be sure to use the correct SMB connectors for the module.
1 Ω. Replace the module if the relay contact resistance is in excess of 1 Ω.
Replace the module if the relay contact resistance if less than 10 MΩ.
Performance Verification
on page 76.
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