RJS Inspector D4000 Auto Optic (FIRMWARE version A.06 and Later) User Manual
Page 76
Appendix K
Operator
’s Guide
RJS, Minneapolis, MN
002-5564
The greatest reflectance value in a scan reflectance
profile including quiet zone. (Note: eRmx is the
greatest reflectance value of an element, not includ-
ing quiet zone).
Minimum Edge Contrast (Ecmn)
The smallest edge contrast in a scan reflectance pro-
file.
Minimum Reflectance (Rmn)
The smallest reflectance value in a scan reflectance
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 symbol
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 intensity of
narrow elements to wide elements is called modula-
tion. This condition is affected by aperture size.
Note: Since
“ink spread” will reduce the width and intens
i-
ty of single module space within a symbol, this is one
thing to check in seeking to correct a low modulation
grade
Module