Keysight Technologies U1450 Series, Service Manual

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1 Calibration Procedures
Test Considerations
22 U1450 Series/U1461A Service Guide
Test Considerations
For optimum performance, all procedures should comply with the
following recommendations:
• The performance verification test or adjustment should be performed
under laboratory conditions where the ambient temperature can be
controlled.
•
The instrument should be put under the laboratory environment for at
least 1 hour.
• Ensure that the calibration ambient temperature is stable and is
between 18 °C and 28 °C. Ideally the calibration should be performed
at 23 °C ± 1 °C.
• Ensure that the ambient relative humidity is less than 80%.
•
Allow a warm- up period of 3 minutes.
• Use a shielded twisted pair of PTFE- insulated cables to reduce settling
and noise errors. Keep the input cables as short as possible. Long test
leads can also act as antennas which may pick up AC signals.
• Connect the input cable shields to earth ground.