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Decode Distances

The table below lists the typical and guaranteed scanning distances for

selected bar code sizes. The minimum element width (“X Dimension”,

“size” or "symbol density") is the width in mils of the narrowest element

(bar or space) in the symbol.

Typical Working

Ranges

Guaranteed

Working Ranges

Symbol

Density /Bar

Code Type

/W-N Ratio

Bar Code

Content

/Contrast

Near Far Near Far

6 mil

Code 39; 2.5:1

123

80% MRD

2.25 in

5.72 cm

4.50 in

11.43 cm

3.00 in

7.62 cm

4.00 in

10.16 cm

7.5 mil

Code 39; 2.5:1

ABCDEF

80% MRD

1.75 in

4.45 cm

6.25 in

15.88 cm

2.50 in

6.35 cm

4.75 in

12.07 cm

10 mil

Code 39; 2.5:1

FGH

80% MRD

1.25 in

3.18 cm

7.50 in

19.05 cm

2.00 in

5.08 cm

6.00 in

15.24 cm

13 mil

UPCA; 2.5:1

012345678905

80% MRD

2.00 in

5.08 cm

8.50 in

21.59 cm

2.50 in

6.36 cm

7.25 in

18.42 cm

20 mil

Code 39; 2.5:1

123

80% MRD

2.20 in

5.59 cm

12.00 in

30.48 cm

Note 2

10.75 in

27.31 cm

55 mil (4)

Code 39; 2.5:1

80% MRD

4.30 in

10.92 cm

24.00 in

60.96 cm

Note 2

16.00 in

40.64 cm

Notes:

1. Contrast measured as Mean Reflective Difference (MRD) at 670 nm.

2. Near ranges on lower densities depend on the width of the bar code and the

scan angle.

3. Working range specifications at ambient temperature (23 C).

4. Retro-reflective label media used for 55 mil bar code.

APPENDIX D: DECODE ZONE | 37

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Socket Mobile 3E Manuale Utente Pagina 37

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