RJS Inspector D4000 Auto Optic (FIRMWARE version A.06 and Later) - Manual (Page 50)

Appendix C Operator
’s Guide
RJS, Minneapolis, MN 002-5564
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 pass-
es reference decode and the other fails reference
decode, (assuming all other parameters scan
“A” or
“B”), the ave
rage would be a
“C” (the averag
e 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 calcu-
lating 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.
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.