Appendix M
Operator
’s Guide
RJS, Minneapolis, MN
003-4500
112
Element Reflectance Non-uniformity (ERN)
The reflectance difference between the highest peak
and lowest valley within each individual element and
quiet zone. When an element consists of a single
peak or valley, its element reflectance non-uniformity
is zero.
Element Width
The thickness or width of a bar or space as measured
from its leading edge to its trailing edge.
Encoded Area
The total linear dimensional space taken by all
characters of a code pattern including start/stop and
data.
First Read Rate
The percentage of successful
“reads” of a
bar code
symbol on the first attempt.
Fixed Beam Scanner
A bar code 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
Flexographic 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.