3 Calibration Procedures
78 Keysight 34420A Service Guide
Test Considerations
To ensure proper instrument operation, verify that you have selected the correct
power line voltage prior to attempting any test procedure in this chapter. See “To
Prepare the Meter For Use” on page 27 for more information.
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.
– Assure ambient relative humidity is less than 80%.
– Allow a 3-hour warm-up period with the low thermal shorting plug connected
before verification or adjustment.
– Assure that low noise connections are made to the meter and calibrator.
Chapter 7 of the Keysight 34420A User's Guide describes low noise input
connections.
– Allow 5 minutes for thermal offset stabilization after handling the input
connector or shorting plug before making measurements or performing
calibrations.
– Ensure the input connector or low thermal shorting plug coupling nut is
properly tightened (torque to 20 in-lb maximum).
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