Features and Functions 3
Keysight 34420A User’s Guide 121
Calibration
This section gives a brief introduction to the calibration features of the meter. For
a more detailed discussion of the calibration procedures, see Chapter 4 in the
Service Guide.
Calibration Security
This feature allows you to enter a security code to prevent accidental or
unauthorized calibrations of the meter. When you first receive your meter, it is
secured. Before you can calibrate the meter, you must unsecure it by entering the
correct security code.
– The security code is set to “KT034420” when the meter is shipped from the
factory. The security code is stored in non-volatile memory, and does not
change when power has been off or after a remote interface reset.
– To secure the meter from the remote interface, the security code may contain
up to 11 alphanumeric characters as shown below. The first character must be
a letter, but the remaining characters can be letters or numbers. You do not
have to use all 11 characters but the first character must always be a letter.
A _ _ _ _ _ _ _ _ _ _ _ (11 characters)
– To secure the meter from the remote interface so that it can be unsecured from
the front panel, use the eight-character format shown below. The first two
characters must be “KT” and the remaining characters must be numbers. Only
the last six characters are recognized from the front panel, but all eight
characters are required. (To unsecure the meter from the front panel, omit the
“KT” and enter the remaining numbers as shown on the following pages.)
K T _ _ _ _ _ _ (8 characters)
If you secure the meter from the remote interface and the secure code you use
does not have the first two characters “KT” and the next 6 characters as digits,
you cannot unsecure the meter from the front panel.
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