Symbol MiniScan MS1204FZY, Руководство по интеграции

Страница: 78 / 260

6 - 8 Symbol MiniScan MSXX04 Series Integration Guide
Symbol MS2204VHD Decode Zones
The decode zone is a function of various symbol characteristics including density, print contrast, wide to narrow
ratio and edge acurity. Typical values are shown.
Table 6-3 on page 6-9 and Table 6-4 on page 6-11 list 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 Methodon page
2-8 .
Symbol MS2204VHD 1D Decode Zone
Figure 6-5
Symbol MS2204VHD 1D Slab/Raster Decode Distances
In.
cm
0
7.5 mil
55 mil
15.0
Depth of Field
5.25
Note: Typical performance at 68˚F (20˚C)
on high quality symbols in normal room light.
Vcc = 5V
2.5
5 7.5 10 12.5
0 12.7 25.4 38.1 50.8 63.5
5 mil
4.75
4 mil
4.1
2.0 3.4
15
76.2
6 mil
0
In. cm
W
i
d
t
h
o
f
F
i
e
l
d
0
2.5
5
7.5
2.5
5
7.5
5.1
10.1
15.2
5.1
10.1
15.2
10 25.4
10 25.4
1.75
1.5
*
* Minimum distance determined by symbol length and scan angle.
MS 2204VHD