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46 | APPENDIX D: DECODE ZONE
SDSC 3P
Typical Working
Ranges
Guaranteed
Working Ranges
Symbol
Density/ Bar
Code Type/ W-
N Ratio
Bar Code
Content/
Contrast
Note 1
Near Far Near Far
4.0 mil
Code 39; 2.5:1
ABCDEFGH
80% MRD
1.00 in
2.50 cm
5.50 in
13.97 cm
2.20 in
5.59 cm
3.20 in
8.13 cm
5.0 mil
Code 39; 2.5:1
ABCDEFGH
80% MRD
1.25 in
3.18 cm
8.00 in
20.32 cm
2.20 in
5.59 cm
5.50 in
13.97 cm
7.5 mil
Code 39; 2.5:1
ABCDEF
80% MRD
1.50 in
3.81 cm
13.00 in
33.02 cm
2.00 in
5.08 cm
9.50 in
24.13 cm
10 mil
Code 39; 2.5:1
ABCDE
90% MRD
1.50 in
3.81 cm
18.00 in
45.72 cm
1.75 in
4.45 cm
14.00 in
35.56 cm
13 mil
100% UPC
12345678905
90% MRD
1.50 in
3.81 cm
24.00 in
60.96 cm
1.75 in
4.45 cm
18.00 in
45.72 cm
15 mil
Code 39; 2.5:1
ABCD
80% MRD
1.50 in
3.81 cm
28.00 in
71.12 cm
1.75 in
4.45 cm
21.00 in
53.34 cm
20 mil
Code 39; 2.2:1
123
80% MRD
1.75 in
4.45 cm
33.00 in
83.82 cm
X
27.00 in
68.58 cm
40 mil
Code 39; 2.2:1
AB
80% MRD
X
36.00 in
91.44 cm
X
28.00 in
71.12cm
55 mil
Code 39; 2.2:1
CD
80% MRD
X
45.00 in
114.30 cm
X
34.00 in
86.36 cm
Notes:
1. CONTRAST measured as Mean Reflective Difference (MRD) at 650 nm.
2. Near ranges on lower densities (not specified) are largely dependent upon
the width of the bar code and the scan angle.
3. Working range specifications at ambient temperature (23°C), Photographic
quality symbols. pitch=10°, roll=0°, skew=0°, ambient light < 150 ft-candles.
4. X - Dependent on width of bar code.
5. Distances measured from front edge of chassis.