Keysight U1281A - Calibration Security

Calibration Procedures 1
Keysight U1281A/U1282A Service Guide 37
Calibration Security
The calibration security code prevents accidental or unauthorized adjustments to
the multimeter. When you first receive your multimeter, it is secured.
Before you can adjust the multimeter, you must unsecure it by entering the
correct security code. See “Unsecuring the Multimeter for Calibration” on
page 38.
The security code is set to when the multimeter is shipped from the factory.
The security code is stored in nonvolatile memory, and does not change when
power has been turned off. The security code may contain up to four numeric
characters.
NOTE
The security code can only be changed after the multimeter has been
unsecured. You can unsecure the multimeter from its front panel.