depth of field:
The range of distances over which a scanner can reliably read a
symbol of given characteristics. Equal to the range of the scanner minus its
optical throw.
discrete bar code symbol:
A symbology in which the spaces between symbol
characters (intercharacter gaps) do not contain information as each character
begins and ends with a bar. Compare to “continuous code.”
EAN:
Abbreviation for EAN International. Also used to refer to the bar code
symbology used for marking of consumer products in accordance with this body's
specifications.
EAN/UPC:
A fixed-length, numeric 13-digit bar code symbol consisting of 30
dark elements and 29 intervening light elements. Each character is represented
by 2 bars and 2 spaces over 7 modules. A bar may be comprised of 1, 2, 3, or 4
modules. Each EAN/UPC symbol consists of a leading quiet zone, a start
pattern, seven left-hand data characters, a center bar pattern, 5 right-hand data
characters, a Modulo 10 check character, a stop pattern, and a trailing quiet
zone. U.P.C. is often considered a 12-digit code. The 13th digit of EAN/UPC
symbol is a derived character in the left most position. In the case of UPC this
derived left-most character is a 0.
See appropriate ISO/IEC JTC 1/SC 31
reference, when available.
edge contrast (EC):
The difference between bar reflectance (Rb) and space
reflectance (Rs) of two adjacent elements.
effective aperture:
The apparent field of view of a scanner or similar device
determined by the smaller of the spot size and the physical aperture of the
scanner for reception of reflected light.
element:
A single bar or space in bar code or multi-row symbologies or a single
cell in matrix symbologies.
element edge:
The location where the scan reflectance profile intersects the
midpoint between the space reflectance (Rs) and bar reflectance (Rb) of
adjoining elements. Visual measuring techniques will generally locate the
element edge closer to the center of the bar.
element reflectance non-uniformity (ERN):
The reflectance difference
between the highest peak and the lowest valley in a profile of an individual
element or quiet zone.
element width:
The thickness of an element measured from the leading edge of
an element to the trailing edge of the same element. See "X dimension.”
extended ASCII:
An extended code set encoded in 8 bits giving values from 0
to 255 in accordance with ISO standard 8859.
eye-readable character:
See “human-readable character.”
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Summary of Contents for Quick Check PC600
Page 1: ...Quick Check PC600 Bar Code Verifier User s Guide ...
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