Technical data

1 Calibration Procedures
Test Considerations
26 U1270 Series 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.