HandHeld Entertainment Quick Check PC600 - Manual (Page 62)

readable symbol has been correctly composed and read. The symbol check
character does not form part of the data encoded in the symbol.
symbol contrast (SC): The reflectance difference between the points of highest
and lowest reflectance respectively in a scan reflectance profile.
symbol density; bar code density: The number of characters that can be
represented in a machine-readable symbol per unit of measure, usually
expressed as characters per inch (cpi) or per centimeter for bar codes and per
square inch (cpsi) or per square centimeter for two-dimensional symbols. The
width of the narrowest bar or space, the wide to narrow ratio, the number of bars
and spaces per character and the width of the intercharacter gap, if any, are the
controlling factors in determining symbol density.
symbol grade: The simple average of all the overall profile grades using the
standard weighting 3.5-4.0 = A, 2.5-3.49 = B, 1.5-2.49 = C, 0.5-1.49 = D, and
<0.5 = F. The symbol grade may be stated as a decimal or converted to a letter
grade. A symbol grade only has meaning when the measuring aperture and the
wavelength of the light source are also specified. The format for denoting the
symbol grade is: "Symbol Grade" followed by a slash ("/") followed by "Measuring
Aperture Number" followed by a slash ("/") followed by the wavelength(s) in
nanometers. For example: “C/06/670.”
symbol width: The total width of a machine-readable symbol including the quiet
zones. For a bar code symbology, this is also referred to as symbol length.
symbology: A standard means of representing data in printed or marked
machine-readable form. Each symbology specification sets out its particular
rules of composition or symbol architecture.
Symbology Identifier: A three-character code that may prefix transmitted data
from a bar code reader indicating the symbology read and any options enabled in
the reader or special features of a symbology encountered (such as, presence of
an FNC1 character in a Code 128 symbol or presence of escape sequences of
Macro PDF417). See appropriate ISO/IEC JTC 1/SC 31 reference, when
available.
thermal printing: A printing system where dots are selectively heated, cooled,
and dragged upon a heat sensitive substrate. The substrate turns dark in the
heated printing areas.
thermal transfer printing: A printing system like thermal except a heat
sensitive ribbon is used and common paper is used as a substrate. Eliminates
the problems of fading or changing color inherent in thermal.
tolerance: The largest permitted variation of a specified dimension or other
value from its nominal value.
toner: (1) A dispersion of highly concentrated pigment or dye used to
manufacture, strengthen, or modify the color of an ink.
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