Calibration Procedures 3
34980A Service Guide 67
Plug-in Modules
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 1 hour 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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