Vetek Weighing AB
www.vetek.com
JWL Service Manual
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PAGE
8
1. Is the voltage 5V at both E+ and E- terminals? Check whether the CPU supply is normal.
b. Check the signal input
1. Check if the outputs from S+ and S- terminals to G change in accordance with the weight on
the pan.
c. Check the digital signals
(1) Check if there is oscillation in Y1’s output pin.
(2) Check if there is oscillation in Y2’s output pin.
2 – 5 Performance Inspection
a. Repetitiveness
Put the weight of two thirds of the load on the pan for five times , the indication difference
between different times should be less than or equal to one division value.
b. Unbalanced loading error
Put the weight of one third of the load on the pan (as shown in the figure). Check if the figure is
precise. The indication difference between the four corners should be less than or equal to one
division value.
a
b
c
d
e
c. Linearity
Load conditions
Permissible error
Idle ~ one third of the load
0 e
One third of the load ~ two thirds of the load
1 e
Two thirds of the load ~ full load
2 e
