Keysight E3631A, Service Manual

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Calibration Procedures 3
Keysight E3631A Service Guide 75
Calibration security code
This feature allows you to enter a security code (electronic key) to prevent
accidental or unauthorized calibrations of the power supply. When you first
receive your power supply, it is secured. Before you can calibrate the power
supply, you must unsecure it by entering the correct security code. A procedure to
unsecure the power supply is given on the following page.
– The security code is set to "HP003631" when the power supply 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 remote interface reset.
– To secure the power supply from the remote interface, the security code may
contain up to 12 alphanumeric characters as shown below. The first character
must be a letter, but the remaining characters can be letters or numbers. You
do not have to use all 12 characters but the first character must always be a
letter.
A _ _ _ _ _ _ _ _ _ _ _ (12 characters)
– To secure the power supply from the remote interface so that it can be
unsecured from the front panel, use the eight-character format shown below.
The first two characters must be "H P" and the remaining characters must be
numbers. Only the last six characters are recognized from the front panel, but
all eight characters are required. To unsecure the power supply from the front
panel, omit the "H P" and enter the remaining numbers as shown on the
following pages.
H P _ _ _ _ _ _ (8 characters)
– If you forget your security code, you can disable the security feature by adding
a jumper inside the power supply, and then entering a new code. See the
procedure in To unsecure the power supply for calibration in this chapter.