Operator’s Guide Appendix C
002-5564 RJS, Minneapolis, MN
Defects
This parameter can be graded “A,” “B,” “C,” “D,” or “F.”
Defects are irregularities in bars, spaces and quiet
zones.
For example, a dark spot in a space could cause a low
enough reflectance to be mistaken for a bar, and the
extra bar would cause a decode error.
The defect grade is determined by a relationship
between the largest defect in the symbol and the symbol
contrast (the smaller the defect, the better the grade).
In general, a small aperture used to analyze very wide
elements will cause the largest defects.
The RJS Inspector D4000 incorporates a feature that
trims reflectance data gathered during a scan to
approximately 10 times the X dimension (5X after a
UPC/EAN addendum). These areas, on either side of
the bar-code, are assumed to be quiet zones and are
included in the analysis.
A graphic object or text in the quiet zone will produce
an “F” grade – This indicates a quiet zone that is too
narrow. We recommend that you scan in both directions
to make maximum use of this feature.
Reference Decode
This parameter can be graded “A” or “F.”
If the Reference Decode parameter is “F,” then the
overall symbol grade is also “F” (regardless of the grade
of any other parameter).
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