User`s guide

194
Chapter 4 Features and Functions
Calibration Overview
To Secure Against Calibration You can secure the instrument
either from the front panel or over the remote interface. The instrument
is secured when shipped from the factory and the security code is set to
“HP034970” or “AT034972”, depending on the product number.
• Once you enter a security code, that code must be used for both front-
panel and remote operation. For example, if you secure the
instrument from the front panel, you must use that same code to
unsecure it from the remote interface.
• Front-Panel Operation:
SECURE CAL
When you enter the Utility menu, the calibration entries toggle
between CAL UNSECURED and SECURE CAL. To secure the
instrument, select SECURE CAL and press . After entering the
desired security code, press again. When you return to the
menu, you will see new choices CAL SECURED and UNSECURE CAL.
• Remote Interface Operation: To secure the instrument, send the
following command with the desired security code.
CAL:SECURE:STATE ON,HP034970
To Change the Security Code To change the security code, you must
first unsecure the instrument, and then enter a new code. Make sure you
have read the security code rules described on page 155 before
attempting to change the security code.
• Front-Panel Operation: To change the security code, first make sure
that the instrument is unsecured. Go to the SECURE CAL entry,
enter the new security code, and press (the instrument is now
secured with the new code). Changing the code from the front panel
also changes the code as seen from the remote interface.
• Remote Interface Operation: To change the security code, first
unsecure the instrument using the old security code. Then, enter the
new code as shown below.
CAL:SECURE:STATE OFF, HP034970 Unsecure with old code
CAL:SECURE:CODE ZZ007943 Enter new code
34970A Refresh UG.book Page 194 Wednesday, February 17, 2010 12:34 PM