Keysight U1253B Guía Del Usuario Y Servicios página 173

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.
– 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
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Ideally, calibration should be performed at 23 °C ± 1 °C.
errors. Keep the input cables as short as possible.
Keysight U1253B User's and Service Guide