Performance Tests and Calibration 6
Keysight U1253B User’s and Service Guide 193
Calibration procedures
1 Turn the rotary switch to the function you wish to calibrate.
2 Unsecure the U1253B true RMS OLED multimeter (refer to “Unsecuring the
instrument for calibration” on page 180).
3 After verifying that the security code you entered is correct, the instrument will
display the reference input value of the next calibration item (refer to Table 6-4
on page 196 for the list and sequence of all the calibration items) on the
secondary display after briefly showing “PASS”.
– For example, if the reference input of the next calibration item is shorting
the input terminals, the secondary display will indicate “REF:+SH.ORT”.
4 Set up the indicated reference input and apply this input to the correct
terminals of the U1253B handheld multimeter. For example:
– If the required reference input is “SHORT”, use a shorting plug to short the
two relevant terminals.
– If the required reference input is “OPEN”, just leave the terminals open.
– If the required reference input is a voltage, current, resistance, capacitance,
or temperature value, set up the Fluke 5520A calibrator (or another device
with equivalent standard of accuracy) to provide the necessary input.
5 With the required reference input applied to the correct terminals, press
to start the present calibration item.
6 During calibration, the primary display and bar-graph will indicate the
uncalibrated reading, and the calibration indicator, “CAL”, will appear on the
upper left corner of the secondary display. If the reading is within the
acceptable range, the word “PASS” will be shown momentarily, and then the
instrument will proceed to the next calibration item. If the reading is out of the
acceptable range, it will remain at the present calibration item after showing
the error code for 3 seconds. In this case, you need to check whether the
correct reference input has been applied. Refer to Table 6-5 on page 201 for
the meaning of the error codes.
If you do not intend to perform the complete set of calibration items, you may
press or to select the item you wish to calibrate.
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