6 Performance Tests and Calibration
172 Keysight U1253B User’s and Service Guide
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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