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12 PowerScan
®
RF Scanner
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 scan-
ning results. The following diagrams provide depth of field informa-
tion 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).
Figure 7. Depth of Field (SR)
NOTE
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.
Depth of Field
Paper Labels (SR decoded model, Code 39)
0
20 mil
15 mil
10 mil
5 mil
CENTIMETERS
FEET
FRONT OF SCANNER
10
12345
20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170
40 mil
7.5 mil
55 mil