Hand Held Products Quick Check 200 Series User Manual page 30

Another press of the Scroll [<>] Button will display (ONLY IF applicable errors
have been found) certain Global Threshold, Reference Decode or Reference
Algorithm failure messages such as:
[GloThrsFAILS] F or [RefDcod FAIL] F or [RefAlgoFAILS] F
Global Threshold ANSI's Symbol Grading methodology requires foremost that
a global reflectance threshold set simply at the halfway point between R(min) and
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R(max) should "find" every bar and space in the symbol. The Quick Check 200
Series uses the ANSI prescribed methodology for precise edge location and
indicates when the global threshold requirement has not been met. "Reference
Decode or Algorithm" ANSI's Graded symbol testing criteria requires that a
given scan be decodable using certain "reference" algorithms, else the scan fails.
Similarly, certain application specifications call for specific formats, checks or
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characters that must be in the symbol. The Quick Check 200 Series employs
advanced decoding schemes to test the necessary reference decoding and
algorithms. If any errors are encountered, a failure is indicated appropriately.
If errors were not found in these areas, the next display would read:
[D Margin xx%] Grade or [Decod'ty xx%]Grade
Decodability/Decodability "Margin" Decodability is a Graded measure of how
close a given scan comes to a reference decode failure due to variations in bar
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and space widths. The Quick Check 200's "Avg DMargin" is the character-
averaged value of Decodability. Decodability is what percentage of the
symbology's safe decoding margin is left for the scanner after printing errors.
Lower margin values and corresponding lower grades indicate an increased
susceptibility to decoding failure due to scanning errors such as, for example,
acceleration or bar or space size deviation. Decodability "Margin" is stated as "D
Margin" in the QC200's LCD Dimensional Details display and ANSI decodability
is listed as "Decod'ty".
If the Scroll [<>] Button is again pressed, various other Dimensional Parameter
errors might be displayed next. Examples of these follow:
[BAD QuietZon] F -- Indicates insufficient Quiet Zone width
[WIDE IC Gap] F -- Indicates the InterCharacter Gap is too wide
[BAD StrtStop] F -- Indicates either the Start or Stop Characters are bad
[BAD GuardPat] F – Indicates that the Guard Bar Pattern in a UPC/EAN/JAN
symbol is bad
[BAD Separatr] F – Indicates a bad Separator Pattern
Pressing the Scroll [<>] Button again produces the display:
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