RJS Inspector D4000 Auto Optic (FIRMWARE version A.05 and Earlier) - Manual (Page 72)

Operator
’
s Guide Appendix K
002-5564 RJS, Minneapolis, MN 65
Global Threshold (GT)
The global threshold is drawn through the middle of a profile, to distinguish spaces above
the line and bars below. The reflectance value is determined by dividing the symbol
contrast (SC) by 2 and adding the minimum reflectance, Rmin.
GT = Rmin + (SC/2)
Guard Bar
The first and last bars of a bar-code symbol usually having the pattern 101. A guard bar
generally follows the leading quiet zone and precedes the trailing quiet zone. This term is
used mostly for UPC/EAN symbologies.
Infinite Pad Method
The method for measuring reflectance in which the sample substrate being measured is
backed with enough thickness of the same type of substrate so that doubling the number
of sheets does not change the measured value of reflectance.
Inspection Band
An area of the bar-code symbol where measurements shall be taken spanning from 10%
to 90% of the average bar height.
Inter-character Gap
In discrete barcodes, the space that separates two adjacent characters. When present,
inter-character gaps are considered spaces (elements) for purposes of edge determination
and reflectance parameter grades.
Interleaved
A bar-code in which characters are paired together using bars to represent the first
character and spaces to represent the second.