Modulation; Symbol Contrast - RJS Inspector 5000 Operator's Manual

Operator's Guide

Modulation

This parameter can be graded 4.0 to 0.0 (A to F)
Modulation grade is based on the relationship between
the minimum edge contrast and the symbol contrast.
Ideally, the edge contrast should be equal to symbol
contrast, but as an aperture size approaches an element
size the amplitude of the signal received will decrease
and the edge contrast will decrease.
The greater the difference between minimum edge
contrast and symbol contrast, the lower the grade.
Note:
Aperture size has the greatest affect on Modulation.
The substrate material can also have a major affect
on Modulation

Symbol Contrast

This parameter can be graded 4.0 to 0.0 (A to F)
Symbol contrast is the difference in reflectance values of
the "lightest" space (including the quiet zone) and the
"darkest" bar of the symbol (the greater the difference,
the higher the grade).
Note:
Bar code colors can have a large effect on this
parameter.
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Appendix A
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RJS, Minneapolis, MN