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Value per overload switch : In the table below the value of each switch is indicated in percentage of the
selected input sensitivity.
F.e. at a 1 mV/V input selection, switch 1 has the value of: 54.61% x 1 mV/V =
0.5461 mV/V. With a loadcell of 200 kg and 2 mV/V output signal, switch 1 has
a value van 54.61 kg.
Indication of overload : A weight value exceeding the selected overload value is shown on the internal
display with a “ ! ” in the 4
e
digit, immediately in front of gross weight reading,
and in the data string too, in the 4
e
digit.
Attention : The linearity compensation is calculated based upon the weight value between
the selected zero value and the selected overload value. Therefore it is
important to adjust an accurate overload value before
starting with the linearity
adjustment !
4.6 ADJUSTING : LINEARITY SWITCH 33 - 37
Parabolic principle : After adjusting the zero, span and overload, probably the weight reading,
at decreasing the weight value on the scale, will show a not linear curve.
By unloading the scale down to 50% of its weighing capacity, the deviation
may be read on the internal display.
From here it is possible to compensate for this deviation.
Not linear effects are most of the time caused low quality of loadcells or by
bending of the scale’s mechanical structure. They are of parabolic shape.
With the 348’s selectable contra parabola this deviation may be compensated
in 15 steps of 0.006% each. Maximum range is 0.09% in + of - .
Procedure : Same procedure as at the zero and span adjustment procedures
The value of the switches counts as binary values. Switch 34 has the highest
value (MSB)
System deviation : The not linearity of a 348 itself is < 0.0016% at FS = 2 mV/V input selection
Effect :
Before adjustment After adjustment
Manual 348-2 V 3.1 Page 16 01-06-2007
Overload range switches 38 up to 48
sw.nr.
% of input
sensitivity
sw.nr.
% of input
sensitivity
38
39
40
41
42
43
54.61
27.31
13.65
6.83
3.41
1.71
44
45
46
47
48
Total
0.85
0.43
0.21
0.11
0.05
109.17
Zero
Ma
x
adjustment 50%
Zero
Ma
x
16


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