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SECTION 3
SE 1223 Very High Density (VHD)
Scanner Decode Zone
The SE 1223 VHD scanner decodes the symbols as de-
scribed in Table 3-6. The numbers shown are typical values
as well as guaranteed values. The minimum element width
(or symbol density) is the width in mils of the narrowest
element (bar or space) in the symbol.
SE 1223 VHD Scanner Decode Distances
Symbol Density
In.
mm
0.002
0.051
0.0025
0.063
0.003
0.076
0.004
0.127
0.005
0.127
0.0075
0.191
100% UPC
* Minimum distance determined by symbol length and scan
angle.
The decode zone is a function of various symbol characteris-
tics including density, print contrast, wide-to-narrow ratio,
and edge acuity. Width of decode zone at any given distance
must be considered when designing a system.
Usable scan length is calculated as follows:
Table 3-6
Typical
Minimum
Maximum
In.
cm
In.
1.9
4.82
2.5
1.7
4.32
3.3
1.7
4.32
4.5
1.7
4.32
6.5
1.7
4.32
7
1.5
3.81
7.5
2.5
6.35
8.5
L = 1.8 x (D + d) x Tan (A/2)
Scanner Specifications
Guaranteed
Minimum
cm
In.
cm
6.35
N/A
8.38
2.25
5.71
11.43
2.25
5.71
16.51
2
5.08
17.78
2
5.08
19.05
2
5.08
21.59
2.75
6.98
SE 1223 Scanner User's Guide
Maximum
In.
cm
N/A
2.75
6.98
3.6
9.14
5
12.7
5
12.7
5.6
14.22
6.9
17.53
3-9
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