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3
Calibration Procedures
DMM Test Considerations
Errors may be induced by ac signals present on the input leads during a self-test.
Long test leads can also act as an antenna causing pick-up of ac signals.
For optimum performance, all procedures should comply with the following
recommendations:
– Assure that the calibration ambient temperature is stable and between 18 °C
– Assure ambient relative humidity is less than 80%.
– Allow a 1.5-hour warm-up period with a copper short connecting pins 3, 4, 8,
– Use shielded twisted pair PTFE insulated cables to reduce settling and noise
– Connect the input cable shield to the source LO output. Except where noted in
– Either remove all modules from the mainframe, or reset the modules to ensure
Because the instrument is capable of making highly accurate measurements, you
must take special care to ensure that the calibration standards and test
procedures used do not introduce additional errors. Ideally, the standards used to
verify and adjust the instrument should be an order of magnitude more accurate
than each instrument range full scale error specification.
For the dc voltage, dc current, and resistance gain verification measurements, you
should take care to ensure the calibrator's "0" output is correct. If necessary, the
measurements can be referenced to the calibrator's "0" output using Mx + B
scaling (see Chapter 2 in the 34980A User's Guide). You will need to set the offset
for each range of the measuring function being verified.
42
and 28 °C. Ideally the calibration should be performed at 23 °C ±1 °C.
and 9 of the ABus connector. Connector pinout is shown in the figure on
page
40.
errors. Keep the input cables as short as possible.
the procedures, connect the calibrator LO source to earth ground.
no module is connected to the backplane ABus.
Keysight 34980A Service Guide
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