4 Calibration Procedures
94 Keysight 34970A/34972A Service Guide
Plug-in Module Test Considerations
For optimum performance, all test procedures should comply with the following
recommendations:
– Assure that the calibration ambient temperature is stable and between 18 °C
and 28 °C. Ideally the calibration should be performed at 23 °C ± 1 °C.
– Assure ambient relative humidity is less than 80%.
– Install the plug-in module and allow a 45 minute warm-up period before
verification or adjustment.
– Use shielded twisted pair PTFE insulated cables to reduce settling and noise
errors. Keep the input cables as short as possible.
– Remove all user wiring and connections from the plug-in modules before
verification or adjustment.
– Use 4-wire Ohms measurement techniques for checking relay contact
resistance. Check directly at the terminals where possible.
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