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6
Performance Tests and Calibration
Table 6-4
List of calibration items (continued)
Function
Notes for list of calibration items:
[a] Press
or
to select the calibration item (if not performing the complete set of calibration). After successfully calibrating an item, the
multimeter will automatically proceed to the next item.
[b] Both AC V positions must be calibrated individually.
[c] The minimum AC current output of the Fluke 5520A calibrator is 29.0 A, therefore, an output of at least 30.0 A must be set for the
calibrator.
[d] Be sure to recalibrate the "Short" using the dual banana plug with copper wire after performing calibration for resistance.
[e] Ensure that the multimeter is turned on and stabilized for at least 60 minutes, with the K-type thermocouple connected between the
multimeter and the calibrator out terminal.
— Set the 5520A to internal reference.
— Prior to performing adjustment, connect one end of the K-type thermocouple (with miniature TC connector on both ends) to the 5520A TC
output, and the other end to a precision thermometer to verify that the source outputs the desired value. Adjust the source accordingly if
necessary.
— To perform the adjustment, connect one end of the K-type thermocouple (with miniature TC connector on both ends) to the 5520A TC
output, and the other end to the multimeter via a TC-to-banana adapter. Allow at least 1 hour for the multimeter to stabilize.
Calibration count
The calibration count feature provides an independent "serialization" of your
calibrations. With it, you can determine the number of times your instrument has
been calibrated. By monitoring the calibration count, you can tell whether an
unauthorized calibration has been performed. The value will increment by one
each time the instrument is calibrated.
The calibration count is stored in a nonvolatile EEPROM memory, the contents of
which do not change even after the instrument is switched off or after a remote
interface reset. Your U1253B true RMS OLED multimeter had been calibrated
before leaving the factory. When you receive your multimeter, make sure to read
the calibration count and record it for maintenance purpose.
The calibration count increases up to a maximum of 65535, after which it wraps
around to 0. There is no way to program or reset the calibration count. It is an
independent electronic "serialization" value.
To view the present calibration count, unsecure the instrument from the front
panel (see
press
count display.
200
Range
Calibration item
"Unsecuring the instrument for calibration"
to view the calibration count. Press
[a]
Reference input
on page 180), and then
again to exit the calibration
Keysight U1253B User's and Service Guide
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