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4 - 2 Quick Check® 600/800 Series User’s Guide
ISO/IEC Symbol Grade
The ISO/IEC Symbol Grade is the average of the scan grades resulting from
scans you take from different paths across the symbol. The ISO/IEC Symbol
Grade is also referred to as the overall or final symbol grade. You can obtain a
symbol grade only if the passing option test criteria is set to an ISO/IEC grade
(not to traditional).
You use the #Scans/Symbol setting to specify the number of individual scan
grades that you want the verifier to use to calculate the symbol grade. The
available settings are 1 through 10, 12, 15, 20, 30, 50, 100 and Var. The default
setting for #Scans/Symbol is 10.
The ISO/IEC standard requires you obtain ten scans of each symbol. For
example, you might sample the symbol at ten different places in the symbol —
four in the upper portion, two in the middle and four in the lower portion. Multiple
scans of the same symbol across different scan paths take advantage of the
vertical redundancy of bar codes and give you a more accurate value of the
symbol’s overall print quality. The flow chart shown on page 4-3 explains how
the ISO/IEC Symbol grade is determined.