Calibration Procedures 3
34980A Service Guide 49
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 68.
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.
If you forget your security code, you can disable the security feature by
following the procedure below.
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