Vishay VT 200 - Service Operations and Testing; Service Operations

Service Operations and Testing
Service Operations
VT200/220 Technical Manual, Rev 1.00.01 71 Doc # TM-VT200/220-EN
8 Service Operations and Testing
8.1 Service Operations
The operations described below are performed by accessing the function menu
(pressing the TARE (
) button for three seconds). 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) is a password that 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 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 Setting Date, Time and Serial Number (Function 05)
In order to set the time, the battery backed RAM and real time clock option must be
installed.
This function depends on two parameters accessed through SETUP > SETUP1:
 Parameter 1.6 – enables and disables battery-backed RAM.
 Parameter 1.4 – specifies the date format (DDMMYY or MMDDYY).