23
When in the ANSI Grading mode, every tenth measurement of a given symbol
(or every eightieth measurement if also in Extended Accuracy mode) will
cause the results message for the last scan to be replaced with:
[**g/aa/lll**] x.x
reflecting the ANSI Symbol Grade (average of the ten Scan Grades per ANSI
procedures). In this display, “g” is the ANSI Grade (A,B,C,D or F), “aa” is the
verifier’s aperture size, “lll” is the verifier’s spectral response and “x.x” is the
numerical value the ANSI letter grade was derived from.
Test Result Details
Dimensional Parameters
After a successful scan is made, detailed results in the Dimensional Parameters
area are accessed by first pressing the Select [0] Button once. This will produce
the display:
[Dim’l Data>] P (or F)
Either the “P” or “F” will be shown to indicate if the symbol under test passed or
failed the Dimensional Parameters. Pressing the Scroll [<>] Button will move you
into the Dimensional Parameters details. The order the displays are shown
changes dependent upon whether the QC200 is set for “Traditional” or “ ANSI”
testing criteria (though in each case all the same displays are shown). For this
document, the order used with “Traditional” test criteria is illustrated, with the first
display showing:
[AvgBar x.xxX] P (or F)
AvgBar is the average bar print error. It is the value or amount of average bar
growth or shrinkage in the measured symbol relative to its X dimension. This
value is compared against Traditional print tolerance criteria with the “P” of “F”
showing compliance or non-compliance. Pressing the Scroll [<>] Button again
changes the display to:
[W/N Ratio x.xx] P (or F)
W/N Ratio is the wide-to-narrow ratio and is measured for those symbologies
where it is meaningful, namely Code 39, Interleaved 2/5 and USS-Codabar;
otherwise, it is not displayed. This value is compared against either generic limit
(1.8 to 3.2) or a target fixed value (e.g., 2.5 + 0.2) to determine if it passes or
fails. An out-of-range W/N ratio is considered a dimensional error under BOTH
Traditional and Graded testing criteria.
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