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Field
W/N
NEW
Contrast
MOD
DEF
RMIN
*
**
9-16
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:
A (Pass)
3:1 to 2:1*
3:1 to 2.2:1**
0.080 to 0.010
100 to 70
100 to 70
0 to 15
0 to 49
Narrow Element Width greater than or equal to 0.020
Narrow Element Width less than 0.020
Table 1 — Bar Code Grades
Grade
B
60 to 55
54 to 40
69 to 60
59 to 50
16 to 20
21 to 25
C
D
2:1 to 1:1*
2.2:1 to1:1**
0.009 to 0.000
39 to 20
19 to 0
49 to 40
39 to 0
26 to 30
31 to 100
50 to 100
A-61139 March 2000
F (Fail)
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