RJS Inspector D4000 Auto Optic (FIRMWARE version A.06 and Later) - Manual (Page 52)

Appendix D Operator
’s Guide
RJS, Minneapolis, MN 002-5564
Appendix D (Quiet Zone Analysis)
Quiet Zone Analysis
The RJS Inspector D4000 trims data gathered during a
scan to approximately 10 times the X dimension on each
side of a bar code for all symbologies except UPC and
EAN. The areas are assumed to be quiet zones and are
included in the symbol analysis. If a low reflectance
object is detected in these areas, an Overall Symbol
Grade of F will result. The Defects calculation will be the
cause of the F grade and typically be a value greater
than 50%.
Symbols should be scanned in both directions since the
RJS Inspector D4000 is designed to be bi-directional.
Quiet Zone Analysis for UPC and EAN symbols are
described in the following tables. In cases where an
addendum is included in the bar code, an addendum gap
analysis is also performed.
Table D-1 (Acceptable Parameters for Symbols Without
Addendums)
Symbology Leading QZ Trailing QZ
UPC-A 9X Minimum 9X Minimum
UPC-E 9X Minimum 7X Minimum
EAN-13 11X Minimum 7X Minimum
EAN-8 7X Minimum 7X Minimum
Table D-2 (Acceptable Parameters for Symbols With
Addendums)
Symbology Leading QZ Trailing QZ GAP Size
UPC-A 9X Minimum 5X Minimum 9 - 12X
UPC-3 9X Minimum 5X Minimum 9 - 12X
EAN-13 11X Minimum 5X Minimum 7 - 10X
EAN-8 7X Minimum 5X Minimum 7 - 10X