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250 L4400 User’s Guide
A L4451A and L4452A Calibration Procedures
Calibration Security
This feature allows you to enter a security code to prevent accidental or
unauthorized adjustments of the instruments. When you first receive your
instrument, it is secured. Before you can adjust the instrument, you must
unsecure it by entering the correct security code.
• Calibration is secured and unsecured using the command:
CALibration:SECure:STATe <mode>,<code>
• The security code is set to ATL4400 when the instrument is shipped
from the factory. The security code is stored in non-volatile memory,
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 may contain up to 12 alphanumeric characters. The
first character must be a letter, but the remaining characters can be
letters, numbers, or an underscore ( _ ). You do not have to use all 12
characters but the first character must always be a letter.
• The L4451A 4-Channel DAC has two modes of adjustment, based upon
the setting of the calibration security feature. Additional details are
described in “L4451A 4-Channel Isolated DAC Module" on page 253.
Refer to the Programmer's Reference Help File located on the Agilent
L4400 Product Reference CD- ROM for complete information on the
L4451A and L4452A calibration command.
To Unsecure the Instrument Without the Security Code To unsecure the
instrument and reset the security code when the current security code is
unknown, follow the steps below.
1 Turn off power to the instrument.
2 Remove the instrument sub- assembly from the instrument carrier.
3 Turn on the instrument (carrier).
4 Send the command CALibration:SECure:STATe OFF,<code> to
the instrument. Enter ANY valid (see above) code. This code is
temporarily used to unsecure the instrument.
5 Send the command CALibration:SECure:CODE <new_code> and
enter the instrument’s new security code. Record this code for future
reference.
NOTE
If you forget your security code, you can disable the security feature by
following the procedure below.