Operator
’s Guide
Appendix M
003-4500
RJS, Minneapolis, MN
119
Reflectance
A measure of the amount of light reflected from an
illuminated surface.
Reflectance Minimum
This parameter grade can be 4.0 /
“A” or
0.0 /
“F.”
The reflectance value of the
“lightest” space in a
symbol must be equal to or greater than twice
the reflectance value of the
“darkest” bar.
Refl(max) = or > Refl(min) x 2 if
“yes”
4.0 /
“A” else
0.0 /
“F”
Reflectance Calibration Standard
(See plaque) A standard or
“known” reflectance value,
usually printed on the back of a template or plaque. Bar
code readers are calibrated for reflectance using these
known values.
Required PCS
This is the minimum PCS percent required for the
symbol.
Resolution
The dimension of the smallest code element that can
be printed; the higher the resolution the clearer the
image.
Scanner
An electronic device that converts printed information
into electrical signals.
Scan Reflectance Profile
A record (usually graphically represented) of the
reflectance measured using the reference reflectivity
method as a function of distance across the entire bar
code symbol.