Calibration Procedures 2
Keysight DAQ970A/DAQ973A Service Guide 47
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:
Environmental conditions
– Assure that the calibration ambient temperature (T
cal
) is stable and between
18 °C and 28 °C. Ideally the calibration should be performed at 23 °C ± 1 °C.
– Assure that the ambient relative humidity is less than 80%.
– Allow at least a 60-minute warm-up period with a 4-wire copper short and the
5-wire input test signal cable connected to the respective channels in the
DAQM901A multiplexer module installed in slot 300 before verification or
adjustment. For more information, see “Input Connections” on page 37.
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