Operator’s Guide Appendix C
002-5564 RJS, Minneapolis, MN
For optimum scanning, each narrow element (bar or
space) should be the same dimension, and each wide
element (bar or space) should be the same dimension.
Traditional Analysis Tolerance Graph
-100% Tol. +100%
------RRARR+++++
This graph is similar to the ISO/ANSI Decodability
parameter grade previously described except this
analysis is based on the average deviations of the bars
of each character in a symbol instead of the most
deviant element in the symbol.
The width of the graph represents the total deviation
from normal reflectance that bars in a symbol can have
and still be within dimensional specifications.
The graph provides information about bars being narrow
or wide, whereas ISO/ANSI Decodability does not.
In the graph, “A” indicates the average bar deviation of
all characters in the symbol. The “R’s” (if any) indicate
the range of average bar deviations.
The graph is normalized to plus or minus 100%
tolerance with no specific dimensions. Higher density
symbols such as 80% UPC may indicate larger ranges
of deviation than low density symbols such as case code
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