34410A/11A/L4411A Service Guide 75
Calibration Procedures 3
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.
See “To Unsecure for Calibration” on page 56 for a procedure to enter the
security code from the front panel. Use the CAL:SEC:STAT ON command to
enter the security code using the remote interface.
• The security code is set to AT34410, AT34411, or ATL4411 when the
instrument is shipped from the factory (depending on the model). 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 up to 12 characters. You do not
have to use all 12 characters but the first character must always be a
letter (A–Z). The remaining 11 characters can be letters, numbers (0–9),
or the underscore character ("_"). Blank spaces are not allowed
To Unsecure the Instrument Without the Security Code
To unsecure the instrument without the correct security code, follow the steps
below. See “To Unsecure for Calibration” on page 56. See “Electrostatic
Discharge (ESD) Precautions” on page 110 before beginning this procedure.
If you forget your security code, you can disable the security feature by following the
procedure below.
If you do not have a record of the security code, try the factory default code (AT34410,
AT34411,or ATL4411 depending on model) before you use the procedure below.
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