Keysight Technologies 34972A - (Optional) 34903 A Relay Contact Resistance Verification

4 Calibration Procedures
108 Keysight 34970A/34972A Service Guide
(Optional) 34903A Relay Contact Resistance Verification
1 Be sure to read “Plug-in Module Test Considerations” on page 94.
2 Install the 34903A module in slot 100. Close Channels 01 through 20. Remove
the module from the 34970A/34972A.
3 Measure the resistance from the
CM terminal to the NO terminal on each
channel.
4 Install the module in slot 100. Open Channel 01 through 20. Remove the
module from the 34970A/34972A.
5 Measure the resistance from the
CM terminal to the NC terminal on each
channel.
NOTE
In general, a new relay should have a contact resistance of less than 0.2 W.
Relays with contact resistance in excess of 1.2 W should be replaced.