RJS Inspector D4000 SP (FIRMWARE version A.06 and Later) - Manual (Page 56)

Appendix G Operator
’s Guide
RJS, Minneapolis, MN 002-5572
Appendix G (Magnifications)
UPC/EAN Magnifications & Bar Width Deviations
UPC and EAN symbols have fixed lengths and for-
mats; therefore, the only way to change their sizes is to
magnify them. Specifications relative to bar/space
tolerances are published for 80% to 200% magnifica-
tions.
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 specifica-
tion) because of the larger tolerances of a larger
symbol.
Note:
Magnification choices affect only the traditional bar
width deviation analysis.