Rjs Inspector D4000 Auto Optic (FIRMWARE version A.06 Instrukcja Użytkownika Pobierz pdf (Strona 72)

Appendix K Operator’s Guide

RJS, Minneapolis, MN 002-5564

Edge Contrast (EC) See Edge Contrast(min)

The difference between the space reflectance (Rs)

and adjoining bar reflectance (Rb).

EC = Rs - Rb

Edge Contrast (min)

This parameter grade can be “A” or “F.” Edge con-

trast is the Reflectance difference between adjoining

bars and spaces. The minimum edge contrast is the

smallest value of EC = R space – R bar found in the

scan.

The grade is determined by calculating the edge con-

trast of every element in a symbol and then compar-

ing the lowest value to a fixed threshold in the speci-

fication (15%).

If the value is equal to or greater than the threshold,

the grade is “A.” If the value is less than the thresh-

old, the grade is “F.”

Element

A generic term used to refer to either a bar or space

in a bar code symbol.

Element Edge

The location where the scan reflectance profile inter-

sects the midpoint between the space reflectance (R

space) and bar reflectance (R bar) of adjoining ele-

ments. Visual measuring techniques will generally

locate the element edge closer to the center of the

bar.

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Rjs Inspector D4000 Auto Optic (FIRMWARE version A.06 Instrukcja Użytkownika Strona 72