Symbol Technologies DS 3408 - Manual (Page 33)

Scanning 2-9
Decode Zones
Near Focus
Figure 2-7. DS 3408 Near Focus Decode Zone
In.
cm
0
20 mil
Depth of Field
9.5
2 4 6 8 10
0 5.1 10.2 15.2 20.3 25.4
13 mil (100% UPC)
6.0
5 mil
0.8 7.3
2.0 5.5
15 mil PDF417
0
cm
W
i
d
t
h
o
f
F
i
e
l
d
0
1.75 4.4
3.5 8.9
8.9
*
*
* Minimum distance determined by symbol length and scan angle.
1.75
3.5
4.4
in.
Note: Typical performance at 73˚F (23˚C)
on high quality symbols in normal room light.
Vcc = 3.3V
7.5 mil
1.3 6.3
6.67 mil PDF417
2.3 4.5
10 mil PDF417
1.8 5.8
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