Symbol MiniScan MS1204FZY, Руководство по интеграции

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7 - 8 Symbol MiniScan MSXX04 Series Integration Guide
Symbol MS3204 Decode Zones
The decode zone is a function of various symbol characteristics including density, print contrast, wide to narrow
ratio and edge acuity. The figures shown are typical values.
Table 7-3 on page 7-9 and Table 7-4 on page 7-11 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 .
Omnidirectional Decode Distances
Figure 7-5
Symbol MS3204 Omnidirectional Decode Zone
Depth of Field
1.00
.25
In.
cm
0
20 mil
Depth of Field
12.5
2.5
5 7.5 10 12.5
0 12.7 25.4 38.1 50.8 63.5
80% UPC
12.5
6 mil
1.00 6.5
.25 3.25
100% UPC
0
cm
W
i
d
t
h
o
f
F
i
e
l
d
0
2.5 6.35
5 12.7
12.7
1.5
1.75
* Minimum distance determined by symbol length and scan angle.
2.5
5
6.35
in.
Note: Typical performance at 68˚F (20˚C)
on high quality symbols in normal room light.
Vcc = 5V