Decode Distances - Socket 3E User Manual

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.
Symbol
Bar Code
Density /Bar
Content
Code Type
/Contrast
/W-N Ratio
6 mil 123
Code 39; 2.5:1 80% MRD
7.5 mil ABCDEF
Code 39; 2.5:1 80% MRD
10 mil FGH
Code 39; 2.5:1 80% MRD
13 mil 012345678905
UPCA; 2.5:1 80% MRD
20 mil 123
Code 39; 2.5:1 80% MRD
55 mil (4) CD
Code 39; 2.5:1 80% MRD
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.
Typical Working
Ranges
Near Far
2.25 in 4.50 in
5.72 cm 11.43 cm
1.75 in 6.25 in
4.45 cm 15.88 cm
1.25 in 7.50 in
3.18 cm 19.05 cm
2.00 in 8.50 in
5.08 cm 21.59 cm
2.20 in 12.00 in
5.59 cm 30.48 cm
4.30 in 24.00 in
10.92 cm 60.96 cm
APPENDIX D: DECODE ZONE | 37
Guaranteed
Working Ranges
Near Far
3.00 in 4.00 in
7.62 cm 10.16 cm
2.50 in 4.75 in
6.35 cm 12.07 cm
2.00 in 6.00 in
5.08 cm 15.24 cm
2.50 in 7.25 in
6.36 cm 18.42 cm
10.75 in
Note 2
27.31 cm
16.00 in
Note 2
40.64 cm