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8-16 A-61092 September 1999
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
Grade
Field A (Pass) B C D F (Fail)
W/N 3:1 to 2:1*
3:1 to 2.2:1**
2:1 to 1:1*
2.2:1 to1:1**
NEW 0.080 to 0.010 0.009 to 0.000
Contrast 100 to 70 60 to 55 54 to 40 39 to 20 19 to 0
MOD 100 to 70 69 to 60 59 to 50 49 to 40 39 to 0
DEF 0 to 15 16 to 20 21 to 25 26 to 30 31 to 100
RMIN 0 to 49 50 to 100
* Narrow Element Width greater than or equal to 0.020
** Narrow Element Width less than 0.020