User`s guide

Features and Functions 3
Agilent 34980A Mainframe User’s Guide 155
Calibration Overview
This section gives a brief introduction to the calibration features of the
instrument and plug- in modules. For a more detailed discussion of the
calibration procedures, see the Agilent 34980A Service Guide.
Calibration Security
This feature allows you to enter a security code to prevent accidental or
unauthorized calibrations of the instrument. The specified code is used to
unsecure the mainframe and all installed modules. When you first receive
your instrument, it is secured. Before you can calibrate the instrument,
you must unsecure it by entering the correct security code.
• The security code is set to “AT34980” when the instrument is shipped
from the factory. The security code is stored in non- volatile memory in
the mainframe, and does not change when power has been off, after a
Factory Reset (
*RST command), or after an Instrument Preset
(
SYSTem:PRESet command).
• The security code can contain up to 12 characters. The first character
must be a letter (A- Z), but the remaining 11 characters can be letters,
numbers (0- 9), or the underscore character (“_”). Blank spaces are not
allowed. You do not have to use all 12 characters but the first character
must always be a letter.
To Unsecure the Instrument for Calibration
You can unsecure the instrument from the remote interface only. 
The instrument is secured when shipped from the factory.
Remote Interface Operation: To unsecure the instrument, send the following
command (the factory security code is shown).
CAL:SECURE:STATE OFF,AT34980
To Secure the Instrument for Calibration
You can secure the instrument from the remote interface only.
The instrument is secured when shipped from the factory.
Remote Interface Operation: To secure the instrument, send the following
command (the factory security code is shown).
CAL:SECURE:STATE ON,AT34980