34903A Relay Contact Resistance Verification (Optional) - Agilent Technologies 34970A Service Manual

Chapter 4 Calibration Procedures
Relay Verification
(Optional)
34903A Relay Contact Resistance Verification
Be sure to read "Plug-in Module Test Considerations" on page 87.
1
Install the 34903A module in slot 100. Close Channels 01 through 20.
2
Remove the module from the 34970A.
Measure the resistance from the CM terminal to the NO terminal on
3
each channel.
Install the module in slot 100. Open Channel 01 through 20.
4
Remove the module from the 34970A.
Measure the resistance from the CM terminal to the NC terminal on
5
each channel.
Note: In general, a new relay should have a contact resistance of less than
0.2Ω. Relays with contact resistance in excess of 1.2Ω should be replaced.
4
101