144 Agilent U1251A/U1252A User’s and Service Guide
7 Performance Tests and Calibration
Adjustments Consideration
You will need a test input cable, a connectors set, and a
Shorting Plug to adjust the instrument (see “Input
Connections” on page 129).
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.
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 154. In the event of a calibration failure, correct the
problem and repeat the procedure.
Never turn off the instrument during an adjustment. This may delete the
calibration memory for the present function.
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