6 Performance Tests and Calibration
166 Keysight U1251B and U1252B User’s and Service Guide
Adjustments Consideration
You will need a test input cable, a connectors set, and a Shorting Plug to adjust
the instrument.
Adjustments for each function should be performed only in the order shown
below.
1 Allow the instrument to warm up and stabilize for 5 minutes before performing
the adjustments.
2 Ensure that during the adjustments, the low battery indicator does not appear.
Replace the batteries as soon as possible to avoid false reading.
3 Consider the thermal effects as you are connecting test leads to the calibrator
and handheld multimeter. It is recommended to wait for one minute before you
begin the calibration after connecting the test leads.
4 During ambient temperature adjustment, be sure to turn on the instrument for
at least 1 hour with the K-type thermocouple connected between the
instrument and the calibration source.
NOTE
After each adjustment, the secondary display briefly shows PASS. If the
calibration fails, the handheld multimeter sounds a beep, and an error number is
shown in the secondary display. Calibration error messages are described on
page 176. In the event of a calibration failure, correct the problem and repeat
the procedure.
CAUTION
Never turn off the instrument during an adjustment. This may delete the
calibration memory for the present function.
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