Vishay VT 200, Technical Manual, Page: 38 / 84

Calibration
Calibration with Standard Weights (S-CAL)
VT200/220 Technical Manual, Rev 1.00.01
38
Doc # TM-VT200/220-EN
4 Calibration
Before you can calibrate the scale, you must ensure that jumper JP1 is not in the
sealed position (see section
4.4). There are two ways to calibrate the VT200/220:
Standard weights calibration, in which you record the center of zero, and then
place a known weight on the scale and enter its weight (see section
4.1).
Electronic calibration, in which you enter the mV value of the minimum and
maximum weight (see section
4.2).
Both of the above are performed using the
CAL
setup menu.
After calibrating the scale, you must store calibration data in persistent memory (see
section
4.3), and seal the calibration lock (see section 4.4).
If you have two scales connected to the indicator, each scale has its own
calibration parameters. All the parameters in the
CAL
menu relate to the
currently active scale. To calibrate scale 2, for instance, switch to scale 2 by
pressing
SCALE
( ), and then access the
CAL
menu and perform calibration.
4.1 Calibration with Standard Weights (S-CAL)
Calibration with standard weights is done in two stages:
Zero calibration, in which you take a weight measurement when there is nothing
on the scale (see section
4.1.1). This is also called dead-load adjustment.
Span calibration, in which you place a known weight on the scale, and manually
enter its correct weight (see section
4.1.2).
You must perform both of the above for the scale to be calibrated properly.
After calibrating the scale, you must save the values in permanent memories by
entering the setup menus and selecting the
STORE
option (see section 4.3). It
is also advised to lock calibration (see section 4.4).
4.1.1
Zero (Dead-Load) Calibration
To perform zero calibration:
1. Enter the setup menus and use
TOTAL
( ) to scroll to the
CAL
menu. Press
PRINT
( ) to enter the menu.
2. Press
PRINT
( ) to enter the
S-CAL
menu.
3. Press
PRINT
( ) to select the
ZEro
option (zero calibration).
4. The display shows
E Scl
. Clear the scale, and wait about 10 seconds.