150 U1253B User’s and Service Guide
6 Performance Tests and Calibration
Calibration Security
A calibration security code is in place to prevent accidental
or unauthorized adjustments to the U1253B true RMS OLED
multimeter. When you first receive your instrument, it is
secured. Before you can adjust the instrument, you must
“unsecure” it by entering the correct security code (see the
section “Unsecuring the instrument for calibration” on
page 150).
The security code is set as 1234 when the instrument is
shipped from the factory. The security code is stored in
nonvolatile memory, which does not change even when the
power is off.
Unsecuring the instrument for calibration
Before you can adjust the instrument, you must unsecure it
by entering the correct security code from the front panel.
The default security code is 1234.
From front panel
1 Turn the rotary switch to the position (you may
also start with another rotary switch position; but here
we assume that you will follow the exact steps listed in
Table 6- 2).
2 Press and simultaneously to enter the
Calibration Security Code entry mode.
3 The secondary display will indicate “CSC:I 5555”, where
the character “I” signifies “input”.
You can unsecure the instrument and then change the security code from
the front panel.
See the section “Resetting the security code to factory default” on
page 155 if you forget your security code.
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