RJS Inspector D4000 Auto Optic (FIRMWARE version A.05 and Earlier) - Manual (Page 59)

Appendix I Operator
’
s Guide
002-5564 RJS, Minneapolis, MN 52
Appendix I (Quiet Zone Analysis)
Quiet Zone Analysis
The Inspector 4000 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 Inspector 4000 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 I-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