PT113
Instruction Manual
23
Figure 4.3 - vCal Calibration
After selecting vCal calibration, enter the following values as described below;
Note: Scale build values should be entered before starting calibration.
•
Total Load cell Capacity:
Enter total load cell capacity in kg as in the example below.
Example: If the weighing system has 4 pcs. 1000 kg load cell, enter 4*1000 = 4000 kg.
•
Average Load cell Output:
Enter the load cell output sensitivity in mV/V. If the weighing
system has more than one load cell, calculate the average value of the combined load cell
mV/V outputs indicated on the certificates of the load cells.
Example: If load cell outputs are LC1: 2.0010, LC2: 1.9998, LC3:1.9986 and LC4:2.0002, the
average value will be
LC output = ( 2.0010 + 1.9998 + 1.9986 + 2.0002 ) ÷ 4 = 1.9999 mV/V.
The vCal Wizard 6.3.3.4.1 can calculate this average for you.
•
Estimated Dead Load:
Enter the estimated dead load value of the weighing system in kg. You
may perform zero adjustment at a later at a convenient time for exact dead load compensation.
You will receive an error about build if you do not enter a value here.
Warning:
vCal Estimated Dead Load must be an integer (whole number) in kg. Using a number
with decimal point will result in an incorrect calibration.
Press Write
vCal Data to Device
, to transfer the vCal data to the instrument and vCal is finished.
If the scale is empty and you want to perform an automatic zero adjustment for better accuracy instead
of entering an estimated dead load, enter 0 for the estimated dead load and press the v
Cal with Zero
Adjustment
button to start zero calibration. The display will show the [WAIT] message during zero
calibration for approximately 5 seconds. During zero calibration the scale must be unloaded and stable.
vCal calibration coefficients are saved automatically and vCal is finished.
6.3.3.4.1 vCal Wizard
The vCal Wizard helps the user by calculating Total Load Cell capacity and Average Load cell Output
for vCal. Enter the number of load cells, the units the load cell measures in (lb, kg, t, kN, etc.) and the
load cell capacity then each load cell mV/V value. Press calculate and the values will be entered into
the vCal data fields.
6.3.3.4.2 Improving accuracy with vCal
vCal uses the load cell sensitivity (mV/V) from the data sheets, it does not take into account local
