RJS Inspector D4000 SP (FIRMWARE version A.06 and Later) - Manual (Page 69)

Operator
’s Guide
Appendix K
002-5572 RJS, Minneapolis, MN 61
The greatest reflectance value in a scan reflec-
tance profile including quiet zone. (Note: eRmx is
the greatest reflectance value of an element, not
including quiet zone).
Minimum Edge Contrast (Ecmn)
The smallest edge contrast in a scan reflectance
profile.
Minimum Reflectance (Rmn)
The smallest reflectance value in a scan reflec-
tance profile.
Misread
A condition that occurs when the data output of a
reader does not agree with the encoded data.
Modulation (MOD)
This parameter grade can be
“A,” “B,” “C,” “D” or
“F.”
The modulation grade is based on the relationship
between minimum edge contrast (Ecmin) and sym-
bol contrast (SC).
MOD = ECmin/SC
The greater the difference between minimum edge
contrast and symbol contrast, the lower the grade.
Scanners and verifiers perceive the narrower bars
and spaces to have less intensity than wider bars
and spaces; the comparison of this diminished in-
tensity of narrow elements to wide elements is
called modulation. This condition is affected by
aperture size.
Note: Since
“ink spread” will reduce the width and inte
n-
sity of single module space within a symbol, this is one
thing to check in seeking to correct a low modulation
grade