RJS Inspector D4000 - Appendix F: Magnifications; UPC;EAN Magnifications and Bar Width Deviations

Operator’s Guide Appendix F
002-5564 RJS, Minneapolis, MN
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Appendix F (Magnifications)
UPC/EAN Magnifications & Bar Width Deviations
UPC and EAN symbols have fixed lengths and formats;
therefore, the only way to change their sizes is to
magnify them. Specifications relative to bar/space
tolerances are published for 80% to 200%
magnifications.
While the RJS Inspector D4000 does not measure the
bars and spaces to derive a magnification, it does
determine the relative sizes of the elements and
therefore the bar width deviations.
When UPC and EAN symbols are analyzed, the
approximate symbol magnification must be known in
order to most accurately determine if the symbol is within
tolerance.
For example, if a range of 90 - 115% magnification is
selected and a 200% symbol is analyzed, there will be a
greater chance of a warning message for the symbol
(despite its being within specification) because of the
stricter tolerances of a smaller symbol.
Conversely, if a range of 151% - 200% magnification is
selected and a 100% symbol is analyzed, there will be a
greater chance of an acceptance message for the
symbol (despite its possibly not being within
specification) because of the larger tolerances of a larger
symbol.
Note
:
Magnification choices affect only the traditional bar width
deviation analysis.