(Optional)
34905A/06A Relay Contact Resistance Verification
Note: Be sure to use the correct SMB connectors (50Ω or 75Ω).
1 Be sure to read “Plug-in Module Test Considerations” on page 87.
2 Prepare the module by connecting an SMB short to CH10, CH11,
CH12, and CH13. Connect the COM1 terminal to the DMM.
Be sure to use the correct SMB connectors for the module.
3 Install the module in slot 100.
4 Close Channel 11.
5 Measure the resistance on the DMM.
6 Repeat steps 4 and 5 for Channels 12, 13, and 14.
7 Repeat steps 2, 3, 4, 5, and 6 for the channels connected to COM2.
Note: In general, a new relay should have a contact resistance of less
than 0.5Ω. Relays with contact resistance in excess of 1Ω should be replaced.
Module Reference
4
Chapter 4 Calibration Procedures
Relay Verification
105
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