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174 Service Procedures
Appendix D
Calibration Security Code
This feature allows you to enter a security code (electronic key) to prevent
accidental or unauthorized calibrations of the function generator. When you
first receive your function generator, it is secured. Before you can adjust
calibration constants you must unsecure the function generator by entering
the correct security code.
• The security code is set to “HP_E1441” when the function generator 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 function generator 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 unsecure for calibration
Use the following command:
CALibration:SECure:STATe ON | OFF,<secure code>
• use ON or OFF to control the security state (ON for secured, OFF for
unsecured). When OFF, <secure code> string must match that sent
with state ON.
Since the function generator is shipped from the factory with the security
code "HP_E1441", you can initially unsecure the module by sending the
following command:
CAL:SEC:STAT OFF,HP_E1441
To re-secure
Once you have unsecured the instrument, you can re-secure by sending the
CAL:SEC:STAT command with state ON, optionally including the
securitycode.
CAL:SEC:STAT ON[,YOUR_CODE]
secure code not required to
re-enable security.
• If you forget your security code, you can disable the security feature by
connecting a jumper inside the function generator, and then entering a
new code. See the procedure on the following page.
To change security code
Once you have unsecured the instrument, you can change the security code
by sending the CAL:SEC:CODE <new code> command.
CAL:SEC:CODE YOUR_NEWCODE be sure to remember this code