Version 2.1
en MBI 46.31 operating instruction.docx
Issue date: 01/2022
Page 33 of 42
5.5.1 Optimization with the smallest possible error in the zero point
If the measuring task mainly requires a minimum error at the zero point of the
displacement sensor, then the maximum deviation needs to be reduced in the
measuring range.
•
To do so, re
duce the gain in small steps. This causes a “rotation” of the
linearity curve around the zero point. The zero-error setting at the end of the
measuring range is given up.
Figure 22
Ideal zero point, max. linearity error reduced to 0.32 %
5.5.2 Minimal error over the entire measuring range
Some measuring tasks do not require a certain measuring point to show a
higher accuracy than others. In these cases, you can reduce the maximum
linearity error in the entire measuring range further by giving up the zero-error
setting in the zero point.
•
Offset the linearity curve by slightly adjusting the zero-point potentiometer,
until the maximum positive and negative deviation are of equal in magnitude.
-0,4
-0,3
-0,2
-0,1
0
0,1
0,2
0,3
0,4
0,5
0,6
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
Displacement in %
L
in
e
a
ri
ty
e
rr
o
r
in
%
F
S
O
Graph 1
Graph 2
