PSC PowerScanTM RF - Manual (Page 14)

User’s Guide 11
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).
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
1 2 3 4 5
20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170
40 mil
7.5 mil
55 mil