Operator
’s Guide
Appendix M
003-4500
RJS, Minneapolis, MN
113
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)
GS-1
GS1 designs and implements global standards and
solutions to improve the efficiency and visibility of
supply and demand chains globally.
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.