3 Calibration Procedures
94 Keysight 34420A Service Guide
Calibration Count
The calibration count feature provides an independent “serialization” of your
calibrations. You can determine the number of times that your meter has been
calibrated. By monitoring the calibration count, you can determine whether an
unauthorized calibration has been performed.
Since the value increments by one for each calibration, a complete calibration
increases the value by approximately 24 counts.
– The calibration count is stored in non-volatile memory and does not change
when power has been off or after a remote interface reset. Your meter was
calibrated before it left the factory. When you receive your meter read the
calibration count to determine its value.
– The calibration count increments up to a maximum of 32,767 after which it
wraps around to 0. There is no way provided to program or reset the calibration
count. It is an independent electronic calibration “serialization” value.
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