Rjs Inspector D4000 SP (FIRMWARE version A.06 and Late Manuel d'utilisateur télécharger pdf (Page 44)

Appendix C Operator’s Guide

RJS, Minneapolis, MN 002-5572

Appendix C (ISO/ANSI Decodability)

ISO/ANSI Decodability Calculations

There is a specified method for calculating

Decodability for each symbol. But the method is

generally the same for all. Each element width in a bar

code symbol should be consistent across the symbol.

In the case of Code 39, two element widths are need-

ed to produce a symbol. For optimum scanning, each

narrow element, whether a bar or space, should have

the same width dimension. And each wide element

should have the same width dimension.

The Decodability grade indicates the amount of toler-

ance remaining in the width of the most deviant ele-

ment in the symbol (the more tolerance remaining, the

higher the grade). Grade “A” is the highest grade and

grade “F” is lowest. (Even grade “F” may be de-

codable)

The grade is displayed in both its calculated numeric

form and in its alphanumerical equivalent (the

ISO15416 and ANSI X3.182-1990).

Decodability Grade Conversions

≥ .62 = A

≥ .50 = B

≥ .37 = C

≥ .25 = D

< .25 = F

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 76 77

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Rjs Inspector D4000 SP (FIRMWARE version A.06 and Late Manuel d'utilisateur Page 44