Calibration Procedures 1
Keysight U1281A/U1282A Service Guide 45
Using the Front Panel for Adjustments
This section describes the procedures to perform adjustments from the front
panel.
To unsecure the multimeter, see “To unsecure the multimeter” on page 38. Once
unsecured, the reference value will be indicated on the display.
Adjustment considerations
– Use Fluke 5520A or an equivalent calibrator for the adjustment procedure.
– Ensure the battery capacity is greater than the indicated 60%.
– Ensure that the environmental temperature is 23 ºC ± 2 ºC and the relative
humidity is < 50%.
– Consider the thermal effects as you are connecting the test leads to the
calibrator and multimeter. It is recommended to wait for 3 to 5 seconds before
you begin the calibration after connecting the test leads.
– Calibrate the DC mV prior to ambient temperature calibration. Do not calibrate
the DC mV immediately after a high current measurement or calibration.
– Turn on the multimeter for at least 1 hour with the Type-K thermocouple
connected before proceeding with the ambient temperature adjustment.
– by connecting specified terminals of the multimeter with copper wires
on banana plugs as short as possible.
– by removing all test leads from the terminals of the multimeter.
After each adjustment, the display will show . If the calibration fails, the
multimeter will emit a beep, and an error number will be displayed. Calibration
error messages are described in “Calibration Error Codes” on page 57.
Never turn off the multimeter during an adjustment. This may delete the
calibration memory for the present function.
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