Decode Distances - Socket Secure Digital Scan Card Series 3 User Manual

Decode Distances

The following tables list 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.
SDSC 3E
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
01234567890
13 mil
UPCA; 2.5:1
80% MRD
20 mil 123
Code 39; 2.5:1 80% MRD
55 mil (4) CD
80% MRD
Code 39; 2.5:1
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.
44 | A D: D
PPENDIX ECODE
Typical
Working Ranges
Near
2.25 in
5.72 cm 11.43 cm
1.75 in
4.45 cm 15.88 cm
1.25 in
3.18 cm 19.05 cm
2.00 in
5
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
Z
ONE
Guaranteed
Working Ranges
Far Near
4.50 in 3.00 in 4.00 in
7.62 cm 10.16 cm
6.25 in 2.50 in 4.75 in
6.35 cm 12.07 cm
7.50 in 2.00 in 6.00 in
5.08 cm 15.24 cm
8.50 in 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
Far