Rjs Inspector D4000 Auto Optic (FIRMWARE version A.06 Instrukcja Użytkownika Pobierz pdf (Strona 48)

Appendix C Operator’s Guide

RJS, Minneapolis, MN 002-5564

The parameter grade is determined by:

1. Calculating the edge contrast of every element

edge in a symbol

2. Finding the lowest value (minimum edge contrast)

3. Comparing it to a fixed threshold in the specifica-

tion (15%)

If the value is at least as great at the threshold, the

grade is “A,” otherwise the grade is “F.”

Symbol Contrast

This parameter can be graded “A,” “B,” “C,” “D,” or “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.

Modulation

This parameter can be graded “A,” “B,” “C,” “D,” or “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 Modula-

tion. The substrate material can also have a major affect

on Modulation.

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Rjs Inspector D4000 Auto Optic (FIRMWARE version A.06 Instrukcja Użytkownika Strona 48