6
Performance Tests and Calibration
114
Keysight U1211A, U1212A, and U1213A User’s and Service Guide
Adjustment count
The adjustment count feature provides an independent “serialization” of your
adjustments. With it, you can determine the number of times your instrument has
been adjusted. By monitoring the adjustment count, you can tell whether an
unauthorized adjustment has been performed. The value increments by one each
time instrument is adjusted.
The adjustment count is stored in a non-volatile EEPROM memory, the contents
of which do not change even after the instrument is switched off. Your clamp
meter had been adjusted before leaving the factory. When you receive your clamp
meter, make sure to read the adjustment count for the first time and record it for
maintenance purpose.
The adjustment count increases up to a maximum of 9999, after which it wraps
around to 0. There is no way to program or reset the adjustment count. It is an
independent electronic “serialization” value.
To view the present adjustment count, unsecure the instrument (see
the instrument for calibration”
on page 97), and then press
Shift/Peak
for more
than 1 second to view the adjustment count. Press
Shift/Peak
for more than 1
second again to exit the adjustment count display.
Figure 6-4
Displaying adjustment counts
Press for
> 1 second
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