Motorola DS3478 - Manual (Page 42)

2 - 12 Symbol DS3478 Product Reference Guide
DS3478-HD/DPM Near Focus - 1D and PDF417
Figure 2-10 DS3478-HD/DPM Near Focus Decode Zone - 1D and PDF417
In.
cm
0
20 mil
Depth of Field
7.5
2 4 6 8
0 5.1 10.2 15.2 20.3
13 mil (100% UPC)
5.0
5 mil
2.7 5.6
1.64 4.5
15 mil PDF417
0
cm W
i
d
t
h
o
f
F
i
e
l
d
0
1.0 2.5
2.0 5.1
5.1
*
*
* Minimum distance determined by symbol length and scan angle.
1.0
2.0
2.5
in.
Note: Typical performance at 73°F (23°C)
on high quality symbols in normal room light.
Vcc = 3.3V
7.5 mil
2.1 4.8
6.67 mil PDF417
2.5 4.1
10 mil PDF417
* 4.5
Top of
scanner
4 mil PDF417
2.9 3.7
2.7
20 mil Dot Peen (DPM Version Only)
1.4