RJS Inspector D4000 Laser (FIRMWARE version A.05 and Earlier) - Manual (Page 70)

Appendix K Operator ’ s Guide
RJS, Minneapolis, MN 002-5568 64
Fixed Beam Scanner
A barcode reading device wherein coded items pass across a stationary incandescent or
LED light source.
Flexo Film Master
A measurement standard symbol produced by printing the symbol on clear plastic film
using the Flexograph printing process.
Gloss
A phenomenon related to the specular reflection of incident light. The effect of gloss is
to reflect more of the incident light in a specular manner, and to scatter less. This effect
occurs at all angles of incidence and should not be confused with the grazing angle which
is specular reflection often referred to as sheen.
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 con-
trast (SC) by 2 and adding the minimum reflectance, Rmin.
GT = Rmin + (SC/2)
Guard Bar
The first and last bars of a barcode 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.