Symbol LS 1220, Product Reference Manual

Page: 50 / 136

5-5
LS 1220VHD-I300A Very High Density
LS 1220VHD Decode Zone (V
cc
= 5V)
The LS 1220VHD decodes the symbols as shown in Figure 5-2. The figures shown are
typical values. Table 5-2 on page 5-6 lists the typical and guaranteed distances for selected
bar code densities. The minimum element width (or “symbol density”) is the width in mils of
the narrowest element (bar or space) in the symbol. The maximum usable length of a
symbol at any given range is shown below. To calculate this distance, see Calculating The
Usable Scan Length Method on page 2-5.
Figure 5-2. LS 1220VHD-I300A Decode Zone (Typical)
In.
cm
0
0 1
2.54
3
7.6
2
5.08
4
10.16
LS 1220VHD
1.7
100% UPC
3 mil
5 mil
7.5
8.5
7.5 mil
Depth of Field
0 0
1 2.54
In. cm
W
i
d
t
h
o
f
F
i
e
l
d
5
12.7
6
15.24
8.5
21.59
3 7.6
1 2.54
2 5.08
2 5.08
4 mil
6.5
3.3
2.5 mil
Note: Typical performance at 73.4˚F (23˚C)
on high quality symbols.
3 7.6
7
17.78
2.5
1.5
7.0
4.5
2 mil
1.9
2.5