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

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)

Depth of Field

Paper Labels (SR decoded model, Code 39)

SCANNER

5 mil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7.5 mil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FRONT

 

10 mil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15 mil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20 mil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40 mil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

55 mil

 

 

 

 

 

 

 

 

 

 

 

1

 

 

2

 

 

3

 

 

4

 

 

 

5

 

 

 

 

 

 

 

 

 

 

FEET

 

 

 

 

 

 

 

 

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

 

 

 

 

 

 

 

 

CENTIMETERS

 

 

 

 

 

 

 

User’s Guide

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Image 14
PSC PowerScanTM RF manual Depth of Field, Definition of a mil, Specifications are subject to change without notice