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{7} lists the Data Safety Margin, which is the ratio of the unused error correc-
tion words to the recommended (!) number of such words. Data Safety Mar-
gin can exceed 100%, when the ECL is higher than the minimum
recommended, or be limited to 50% or lower, even with perfect printing,
when the ECL is below minimum. The grade is assigned as:
A
if Safety Margin >= 62%, else
B
if Safety Margin >= 50%, else
C
if Safety Margin >= 37%, else
D
if Safety Margin >= 25%, else
F
otherwise
In Screening modes, this parameter is reported as "Low Data Safety Margin
(44%)" when that is the case.
{8} lists the Edge Accuracy measured in the Start or Stop patterns. The grade
is assigned as:
A
if Edge Accuracy >= 62%, else
B
if Edge Accuracy >= 50%, else
C
if Edge Accuracy >= 37%, else
D
if Edge Accuracy >= 25%, else
F
otherwise
In Screening modes, this parameter is reported as "Poor Edge Accuracy (59%)"
when that is the case.
{9} lists the Print Growth measured in the Start or Stop patterns (the growth of
the dark modules or "bars"). The grade is assigned as:
A
if Print Growth is between +/- 20%, else
B
if Print Growth is between +/- 30%, else
C
if Print Growth is between +/- 40%, else
D
if Print Growth is between +/- 50%, else
F
otherwise
In Screening modes, this parameter is reported as "Excessive Print Growth
(33%)" or "Excessive Print Shrinkage (-43%)" when those are the cases.
In rare instances where neither a valid Start nor Stop pattern is measurable, yet
the symbol is somehow read, lines {8} and {9} are replaced by a message to that
effect. The message is either:
"[F] < Start/Stop Decode Fails" in a Full Report or
"Start/Stop Characters are Bad" in a Screening mode.
In Screening modes, it often occurs that none of the parameters are below the
Minimum Acceptable grade. In this case, the final PQA line becomes:
"All Measurements within range".
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