RJS Inspector D4000 - Decodability and Tolerance Graph

Operator’s Guide Appendix C
002-5564 RJS, Minneapolis, MN
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If the Reference Decode parameter is “A,” then the
overall symbol grade is determined by the lowest of the
other parameter grades.
The RJS Inspector D4000 also decodes each symbology
with a more aggressive algorithm. This enables many
symbols to be scanned and decoded even though the
reference decode grade is an “F.”
The overall symbol grade is averaged for the Reference
Decode parameter:
For example: if 2 scans are averaged and one
passes reference decode and the other fails
reference decode, (assuming all other parameters
scan “A” or “B”), the average would be a “C” (the
average of “A” and “F”)
The average grade for the reference decode parameter
would be “F” however as a warning that at least one
scan failed this parameter.
Decodability
This parameter can be graded “A,” “B,” “C,” “D,” or “F.”
The Decodability grade indicates the amount of error in
the width of the most deviant element in the symbol (the
lower the deviation, the higher the grade).
Each symbology type has a specified method for
calculating Decodability but the basic idea is the same
for all.
Each element size in a bar code symbol should be
consistent across the symbol. In the case of Code 39
there are 2 element widths needed to produce a symbol.