1 Calibration Procedures
26 Keysight U1281A/U1282A Service Guide
Calibration Process
1 Prior to performing the verification tests, see the “Test Considerations” on
page 26.
2 Perform the verification tests to characterize the multimeter; see “Performance
Verification Tests” on page 27.
3 Unsecure the multimeter for calibration; see “Calibration Security” on page 37.
4 Prior to performing the adjustments, see the “Adjustment considerations” on
page 45.
5 Perform the adjustment procedure; see “Adjustment procedure” on page 53.
6 Secure the multimeter against unauthorized calibration; see “Exiting the
adjustment mode” on page 54. Ensure that the multimeter has quit the
adjustment mode and is turned off.
7 Record the new security code and calibration.
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 multimeter 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 5 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.
To Next Page
Loading...
