RJS Inspector D4000 Auto Optic (FIRMWARE version A.06 and Later) - Manual (Page 61)

Operator
’s Guide
Appendix F
002-5564 RJS, Minneapolis, MN 53
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 magni-
fy 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 there-
fore the bar width deviations.
When UPC and EAN symbols are analyzed, the approx-
imate symbol magnification must be known in order to
most accurately determine if the symbol is within toler-
ance.
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.