User's Manual

©2006 Nordic ID Oy
Nordic ID PL3000 user manual, v. 2.6, October 2006 90
Appendix B - Code reading distances and requirements
This appendix explains some basics of reading distances and the specifi cation for some of the supported
codes.
Glossary of terms:
Mil:
One thousand of an inch, ~0,0254mm
X dimension:
Also known as “code size” or “symbol density” of a bar code. In a bar code symbol, data is conveyed by the patterns
and relative widths of the bars and spaces. The x dimension describes the minimum element width in mils of the
narrowest element (bar or space) in the bar code.
For 2D matrix symbologies, X dimension refers to the nominal dimension of the smallest data cell.
The X dimension density of the barcode largely decides how many characters can be encoded in one inch.
The resolution of an imager is also measured by the x dimension density that the imager can recognize.
The decode zone:
The decode zone is a function of various symbol characteristics including density, print contrast, wide-to-narrow ratio
and edge acuity.
Depth of Field (DoF):
The Depth of Field is the area between the maximum and minimum readable length of a scan engine and a bar code.
Field of View (FoV):
The Field of View is the maximum readable size of an ID symbology at the given range