Calibration Procedures 1
Keysight U3606B Service Guide 65
Calibration Security
The calibration security code prevents accidental or unauthorized adjustments to
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 “Unsecuring the Instrument for Calibration” on page 66).
The security code is set to “ATU3606B” when the instrument is shipped from the
factory. The security code is stored in nonvolatile memory, and does not change
when power has been turned 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. The remaining characters can be letters or numbers.
You do not have to use all 12 characters.
Changing the security code from the front panel
You can unsecure the instrument from the front panel using the default security
code, but you cannot change the security code from the front panel. The security
code can only be changed from the remote interface after the instrument has
been unsecured. Refer to “Changing the calibration security code” on page 68
for more details.
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