Reflectance Fields (Grades A through F)
Contrast — a comparison of the darkest element and the lightest element of the bar code.
MOD — Modulation. A measure of the consistency of the overall bar code print clarity (all elements), specifically the occurrence of spots (in spaces) and voids (in bars).
DEF — Defect ratio. A measure of the consistency of the individual element print clarity, specifically the occurrence of spots (in spaces) and voids (in bars).
RMIN — Minimum reflectance. A measure of the lightest element of the bar code.
Table 1 illustrates how the dimensional field values are converted to a pass/fail status and the print clarity field values are converted to letter grades:
| Table 1 — Bar Code Grades |
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Field | A (Pass) | B | C | D |
W/N | 3:1 to 2:1* |
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| 3:1 to 2.2:1** |
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F (Fail)
2:1 to 1:1* 2.2:1 to1:1**
NEW
Contrast
MOD
DEF
RMIN
0.080 to 0.010
100 to 70
100 to 70
0 to 15
0 to 49
60 to 55
69 to 60
16 to 20
54 to 40
59 to 50
21 to 25
39 to 20
49 to 40
26 to 30
0.009 to 0.000
19 to 0
39 to 0
31 to 100
50 to 100
*Narrow Element Width greater than or equal to 0.020
**Narrow Element Width less than 0.020
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