Calibration Security Code - Keysight Technologies 34420A Service Manual

Calibration Security Code

This feature allows you to enter a security code (electronic key) to prevent
accidental or unauthorized calibrations of the meter. When you first receive your
meter, it is secured. Before you can adjust calibration constants you must
unsecure the meter by entering the correct security code. A procedure to
unsecure the meter is given on
page 70.
– The security code is set to "KT034420" when the meter is shipped from the
– To secure the meter from the remote interface, the security code may contain
– To secure the meter from the remote interface but allow it to be unsecured
If you secure the meter from the remote interface and the secure code
NOTE
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.
– If you forget your security code, you can disable the security feature by adding
Keysight 34420A Service Guide
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.
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)
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.)
K T _ _ _ _ _ _ _ _ (8 characters)
a jumper inside the meter, and then entering a new code. See the procedure
on the following page.
"To Unsecure the Meter for Calibration"
Calibration Procedures
on
3
91