254764-001 Rev B 61
ANSI PARAMETER GRADE THRESHOLDS
ANSI parameter fail thresholds are set in the SV 2 Series by commands requiring numeric settings that
correlate to the parameter calculations. Below are descriptions of how the numeric calculations are divided
into letter grades per the ANSI Bar Code Quality Specification
R
min
A < .5 x R
max
F > .5 x R
max
Symbol Contrast
A > 70%
B > 55%
C > 40%
D > 20%
F < 20%
Minimum. Edge Contrast
A > 15%
F < 15%
Modulation
A > .70
B > .60
C > .50
D > .40
F < .40
Decodability
A > .62
B > .50
C > .37
D > .25
F < .25
Defects
A < .15
B < .20
C < .25
D < .30
F > .30
Conversion of letter scan grade to numeric grade
A=4, B=3, C=2, D=1, F=0
Conversion of numeric symbol grade to letter symbol grade (used in averaging)
3.5 < A < 4.0
2.5 < B < 3.5
1.5 < C < 2.5
0.5 < D < 1.5
F < 0.5
Reference Decode
A = ANSI method algorithm decoded the symbol
F = ANSI method algorithm could not decode the symbol
