164 U1253B User’s and Service Guide
6 Performance Tests and Calibration
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 151).
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 167 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
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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