Keysight U1251B Guia Del Usuario página 155

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
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.
You can unsecure the instrument from the front panel. The security code can
NOTE
only be changed from the front panel after the instrument has been unsecured.
See
forget your security code.
Keysight U1251B and U1252B User's and Service Guide
"Unsecuring the instrument for calibration"
"To unsecure the instrument without the security code"
Performance Tests and Calibration
on page 161).
6
on page 162 if you
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