Performance Tests and Calibration 5
U1241B/U1242B User’s and Service Guide 49
Adjustment Considerations
1 Allow the multimeter to warm up and stabilize for five minutes before
performing the adjustments.
2 Assure that the low battery indicator does not appear during the
adjustment. Replace the batteries to avoid inaccurate readings.
3 Consider the thermal effects of the test leads connected to the
calibrator and multimeter. It is recommended to wait for one minute
before start performing the calibration.
4 During ambient temperature adjustment, ensure that the multimeter has
been turned on for at least one hour with K- type thermocouple
connected between the multimeter and calibration source.
After each adjustment, the secondary display shows PAS. If the calibration fails, the
multimeter beeps, and an error number is shown in the secondary display. Calibration error
messages are described in Calibration Errors.
Do not turn off the multimeter during adjustments., as this may delete the calibration mem-
ory for the present function.
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