Rjs Inspector D4000 Auto Optic (FIRMWARE version A.05 Bedienungsanleitung PDF herunterladen (Seite 63)

Operator’s Guide Appendix J

002-5564 RJS, Minneapolis, MN

(Bar-code colors can have a large effect on this parameter.)

Refl (Min)/Refl (Max)

This parameter grade can be “A” of “F.”

The reflectance value of the “lightest” space must be at least twice as great as the reflectance

value of the “darkest” bar, otherwise, the grade will be “F.”

Edge Contrast (Min)

This parameter grade can be “A” of “F.”

Edge contrast is the difference of the reflectance values of the dark and light components of

an edge.

Each element of a bar-code has two edges which go from dark to light. Therefore, each edge

has a dark and light reflectance value component.

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 specification (15%)

If the value is at least as great at the threshold, the grade is “A,” otherwise the grade is “F.”

Modulation

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

Modulation grade is based on the relationship between the minimum edge contrast and the

symbol contrast.

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Rjs Inspector D4000 Auto Optic (FIRMWARE version A.05 Bedienungsanleitung Seite 63