3458A Calibration Introduction 1
Keysight 3458A Calibration Manual 21
Calibration Security
The calibration security feature of the 3458A allows the person responsible for
calibration to enter a security code to prevent accidental or unauthorized
calibration (CAL) or autocalibration (ACAL). The SECURE command is used to
change the security code of the 3458A.
Security code
The security code is an integer from –2.1E-9 to 2.1E9. If the number specified is
not an integer, the multimeter rounds it to an integer value. The multimeter is
shipped from the factory with its security code set to 3458. Specifying 0 for the
new_code in the SECURE command disables the security feature making it no
longer necessary to enter the security code to perform a calibration or autocal.
Changing the security code
The security code is changed with the SECURE command which has the following
syntax:
SECURE old_code, new_code [,acal_secure]
The procedure for changing the security code is as follows:
1 Access the SECURE command. (Press the blue SHIFT key, then the
S menu key. If using the full command menu use the
↓ scroll key to display the
SECURE command).
2 Enter the old security code, the delimiter (,) and the new security code. If you
want to control the auto calibration of the multimeter, enter another delimiter
(,) and the acal_secure parameter ON. The instrument is shipped from the
factory with the security code set to 3458 and the acal_secure parameter set
to ON (security code required to do an acal).
3 Press the Enter key. The instrument will now respond to the new security code.
In the event the security code is unknown, the security feature can be disabled to
permit a new code to be entered. Perform the following procedure to disable the
current unknown security code and enter a known code:
a Turn the instrument off and remove the line cord and all external inputs to
the 3458A.
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