Appendix H
Operator
’s Guide
RJS, Minneapolis, MN
003-4500
92
Appendix H (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 Inspector 5000 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