
Service Operations and Testing
Service Operations
VT200/220 Technical Manual, Rev 1.00.01
71
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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
( ).
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
( ). 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).