Technical data

Calibration Procedures 3
34980A Service Guide 47
Calibration Security
This feature allows you to enter a security code to prevent accidental or
unauthorized adjustments of the instrument. 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.
• The security code is set to AT34980 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 34951A 4 Channel DAC has two modes of adjustment, based upon
the setting of the calibration security feature. Additional details are
described in “34951A 4- Ch Isolated DAC Module" on page 66.
Use the
CALibration:SECure:STATe <mode>,<code> command to secure
or unsecure the instrument. Refer to the 34980A Programmer's Reference
Help File for complete information.
To Unsecure the Instrument Without the Security Code To unsecure the
instrument without the correct security code, follow the steps below.
1 Turn off the instrument.
2 Press and hold the DMM (Measure) key and CANCEL key and turn on
the unit. You can release the keys when the unit has completed the
power on sequence.
3 Send the CALibration:SECure:STATe OFF,<code> command to the
instrument. You may use any valid sequence of characters for the
<
code> value.
4 The unit is now unsecured for calibration.
5 Enter a new security code when calibration is complete. Be sure to
remember the new security code.
NOTE
If you forget your security code, you can disable the security feature by
following the procedure below.