Agilent Technologies 34420A, User Manual, Page: 109 / 294

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 “HP034420” 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 “HP” 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 “HP” and enter
the remaining numbers as shown on the following pages.)
H P _ _ _ _ _ _ (8 characters)
If you secure the meter from the remote interface and the secure code you
use does not have the first two characters "HP" and the next 6 characters
as digits, you cannot unsecure the meter from the front panel.
3
Chapter 3 Features and Functions
Calibration
107