OUTLINE FOR PRODUCT REFERANCE MANUAL
Z-3070 CCD BARCODE SCANNER
a certain frequency determined by the semiconductor’s
particular chemical composition.
MIL
1 mil = 1 thousandth of an inch.
Parameter
A variable that can have different values assigned to it.
Percent Decode The average probability that a single scan of a barcode
would result in successful decode. In a well-designed
barcode scanning system, that probability should
approach near 100%.
Print Contrast
Signal ( PCS )
Measurement of the contrast (brightness difference)
between the bars and spaces of a symbol. A minimum
PCS value is needed for a barcode symbol to be
scannable. PCS=(RL-RD)/RL, where RL is the
reflectance factor of the background and RD the
reflectance factor of the dark bars.
Programming
Mode
The state in which a scanner is configured for
parameter values.
Quiet
Zone
A clear space, containing no dark marks, which
precedes the start character of barcode symbol and
follows the stop character.
Reflectance
Amount of light returned from an illuminated surface.
Scan Area
Area intended to contain a symbol.
Scanner
An electronic device used to scan barcode symbols
and produce a digitized pattern that corresponds to the
bars and spaces of the symbol. Its three main
components are:
1. Light source (laser or photoelectric cell) -
illuminates a barcode.
2. Photodetector – registers the difference in
reflected light (more light reflected from space).
3. Signal conditioning circuit – transforms optical
detector output into a digitized bar pattern.
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