142 U1253B User’s and Service Guide
6 Performance Tests and Calibration
Test Considerations
Long test leads can act as antennas that pick up AC signal
noises.
For optimum performance, all procedures should comply
with the following recommendations:
• Ensure that the ambient temperature is stable and
between 18 °C and 28 °C. Ideally, calibration should be
performed at 23 °C ± 1 °C.
• Ensure that ambient relative humidity is less than 80%.
• Allow a warm- up period of 5 minutes.
• Use shielded twisted- pair PTFE- insulated cables to reduce
settling and noise errors. Keep the input cables as short
as possible.
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