Operator’s Guide Appendix I
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Appendix I (Quiet Zone Analysis)
Quiet Zone Analysis
The D4000 SP1 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, the message “Warning
QZ/SS” is displayed. This means a quiet zone is too narrow or the start (or stop) code may have extra
elements encoded.
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
Table I-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
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