Performance Tests and Calibration 6
Keysight U1251B and U1252B User’s and Service Guide 153
Calibration Security
The calibration security code prevents accidental or unauthorized adjustments to
the instrument. 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 “Unsecuring the instrument for calibration” on page 161).
The security code is set to 1234 when the instrument is shipped from the factory.
This code is stored in nonvolatile memory, and does not change when power is
turned off.
The security code may contain up to 4 numeric characters.
NOTE
You can unsecure the instrument from the front panel. The security code can
only be changed from the front panel after the instrument has been unsecured.
See “To unsecure the instrument without the security code” on page 162 if you
forget your security code.
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