Performance Tests and Calibration
4
34405A User’s and Service Guide
83
Unsecuring the Instrument for Calibration
Before you can adjust the instrument, you must unsecure it by entering
the correct security code. The security code is set to AT34405 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 or
after a Factory Reset (*RST command).
Unsecuring from the Front Panel
Only five characters (the third through seventh characters) of the security
code are used to unsecure the instrument from the front panel. If there
are letters instead of digits in any of the third through seventh characters,
those letters will be represented as "0" from the front panel.
Example 1
Assume the calibration security code is the factory setting of
AT34405
.
When unsecuring from the front panel, the code length is five characters
and the first two characters are ignored. In our example, the code now
becomes:
34405
Example 2
Assume the calibration security code was set to
AT01A405
from the
remote interface. When unsecuring from the front panel, the first two
characters and any characters after the eighth through twelfth character
are ignored. In our example, the code now becomes:
01A40
From the front panel, any letters (
A
in this example) are represented by 0.
Use this code to unsecure:
01040
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