56 34410A/11A/L4411A Service Guide
2Quick Start
To Unsecure for Calibration
Before you can adjust the instrument, you must unsecure it by entering
the correct security code. The security code is set to AT34410 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.
1 Press
2 UTILITY MENU > CALIBRATION > UNSECURE > ENTER CODE
3 Use or to set each character in the code. Change the characters
by pressing or to cycle through all the possible display
characters. The full alphabet is available as well as the digits 0 through
9. The first character must be a letter.
4 Press when done. The CAL UNSECURED message appears briefly.
To Re -s ec u r e
To re-secure the multimeter after a calibration, reverse the process:
Press
UTILITY MENU > CALIBRATION > SECURE > SET CAL CODE
The previous calibration code is proposed. Press to accept that code,
or use the navigation keypad to enter a new code. The CAL SECURED
message appears briefly when you press the key.
If you forget your security code, you can disable the security feature by applying a
temporary short inside the instrument as described in “To Unsecure the Instrument
Without the Security Code” on page 75
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