MATRIX 120™ REFERENCE MANUAL
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6
6 READING FEATURES
6.1 FOV CALCULATION
Use the data in the following table to calculate the FOV for your application, referring to
Figure 56 and the formula below.
Model
d
0
Viewing Angle
Horizontal
Viewing Angle
Vertical
Viewing Angle
Diagonal
Min Reading Distance
mm
Matrix 120 210-xxx (WVGA)
8 mm
39°
26°
46°
25
Matrix 120 310-xxx (MP)
8 mm
41°
32°
49°
30
The viewing angle has a tolerance of
1° depending on the reading distance.
FOV
x
= 2 (d + d
0
) tan (
x
/2)
where:
FOV
x
= horizontal, vertical or diagonal FOV
x
= horizontal, vertical or diagonal viewing angles.
d
= reading distance (in mm) from window surface to code surface
d
0
= offset (in mm) from center of lens to external window surface
FOV
plane
d
0
d
Figure 56
– Reading Distance References
Example:
The FOV for a
Matrix 120 310-xxx
at a
reading distance of 100 mm
is:
FOV
H
= 2 [(100 mm + 8 mm) tan (41°/2)]
81 mm
FOV
V
= 2 [(100 mm + 8 mm) tan (32°/2)]
62 mm
Vertical FOV
