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Depth of Field
There are currently four different range models for the scanner.
Depending upon the model type of your scanner, you'll need to hold
the unit at a given distance from the bar code to achieve optimum
scanning results. The following diagrams provide depth of field
information for each of the models when scanning grade A, Code 39
bar codes: Standard Range (SR), High Density (HD), Long Range
(LR) and Extra Long Range (XLR).
Definition of a "mil"
A "mil" is equal to 0.001 inches. In the context of the illustrations in
this section, a mil represents the minimum bar code element width.
Thus a 5 mil bar code would have a minimum element width of 5
mils (or 0.005 inches).
NOTE
Depth of Field
Paper Labels (SR decoded model, Code 39)
5 mil
7.5 mil
10 mil
0
10
20
User's Guide
Measurements are based on SR models set with the
standard 28° scan width (as opposed to the Half
Angle setting of 14°). Reference the Programming
Manual for more information about the Half Angle
feature.
Specifications are subject to change without notice.
Figure 7. Depth of Field (SR)
15 mil
20 mil
40 mil
1
2
30
40
50
60
70
55 mil
3
4
FEET
80
90
100
110
120
CENTIMETERS
5
130
140
150
160
170
11
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