Operator’s Guide Appendix K
002-5564 RJS, Minneapolis, MN
The greatest reflectance value in a scan reflectance
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 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 modulation. This condition is affected by
aperture size.
Note: Since “ink spread” will reduce the width and intensity
of single module space within a symbol, this is one thing
to check in seeking to correct a low modulation grade
Module
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