Reading Features; Fov Calculation - Datalogic Matrix 120 Reference Manual

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
Matrix 120 210-xxx (WVGA)
Matrix 120 310-xxx (MP)
The viewing angle has a tolerance of  1° depending on the reading distance.
where:
FOV = horizontal, vertical or diagonal FOV
x

= horizontal, vertical or diagonal viewing angles.
x
d = reading distance (in mm) from window surface to code surface
d = offset (in mm) from center of lens to external window surface
0
Example:
The FOV for a Matrix 120 310-xxx at a reading distance of 100 mm is:
66
Viewing Angle
d
0
Horizontal
8 mm 39°
8 mm 41°
FOV = 2 (d + d
x
d
0
Figure 56 – Reading Distance References
= 2 [(100 mm + 8 mm) tan (41°/2)]  81 mm
FOV
H
= 2 [(100 mm + 8 mm) tan (32°/2)]  62 mm
FOV
V
MATRIX 120™ REFERENCE MANUAL
Viewing Angle
Vertical
26°
32°
) tan ( /2)
0 x
d

Viewing Angle Min Reading Distance
Diagonal mm
46° 25
49° 30
Vertical FOV
FOV
plane