Service Operations and Testing
Service Operations
VT400 Technical Manual, Rev. A5 56 Doc # UM-VT400-EN
8 Service Operations and Testing
8.1 Service Operations
The operations described below are performed by accessing the function menu. For
more detailed information on using the function menu, see section 3.3.1.
8.1.1 Setting and Changing Calibration Password (Function 40)
The Personal Identification Number (PIN) restricts access to the calibration procedure.
By default, the PIN is inactive and set to 000000. You can use the procedure below to
set a secret PIN, which will prevent users and unauthorized personnel from changing
calibration parameters.
To change the PIN:
1. Access the function menu and select function 40.
2. The display shows Pin 0 briefly, and then 000000. Enter the old PIN and press
PRINT(
).
If the PIN you entered is correct, the display shows PIN 1.
If you entered a wrong PIN, the unit resets. Turn it on and go back to step 1.
3. Enter the new PIN number and press PRINT(
). The display shows PIN 2.
4. Re-enter the new PIN number and press ENTER.
The new PIN is stored and the display shows PASS briefly. If the two entries are not
the same, FAIL is displayed briefly and the new PIN you entered is discarded.
IMPORTANT: Make sure you do not forget the PIN entered. If the PIN is
lost, the unit must be returned to the factory to initialize the PIN and a
fee will be charged.
8.1.2 Checking Calibration Seal (Function 48)
In order to check that calibration has not been tampered with. This can be verified by
means of the audit trail counter, which increments each time calibration parameters
are changed, and by means of a jumper (for more information, see section 4.4). Use
the procedure below to see the current value of the counter and the current position
of the jumper.
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