6 Performance Tests and Calibration
180 Keysight U1253B User’s and Service Guide
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 180).
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”.
4 Press or to start entering the code (by editing the existing number
“5555” one digit at a time).
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 185 if
you forget your security code.
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