Printronix SL5000r User Manual page 9

Printronix Online Data Validator (ODV) Compliance Statement
The Printronix Online Data Validator gathers data per the ISO/ANSI method of
verification to perform practically all the industry standard bar code quality
parameter calculations. These include all ISO/ANSI method parameters, PCS,
ratio, X dimension calculation, modulo check digit calculations, average bar
deviation, etc., along with decoding the symbol.
Reflectance Compliance – 660 nm Wavelength (Red) Light
The reflectance values embedded in the calibration symbol supplied with each
ODV are traceable to Applied Image Primary Verification Calibrated Standard
per ANSI X3.182 Step Reflectance Chart (see note 2.) Applied Image certified
Calibration Standards are manufactured to Applied Image, Inc. and Uniform
Code Council, Inc. specifications, using ANSI X3.182-1990 methodology, and
are calibrated using standards traceable to the National Institute of Standards
and Technology (N.I.S.T.)
ISO/ANSI Method Compliance
The Printronix ODV gathers data and performs all ISO/ANSI method parameter
calculations per the ISO/IEC 15416 and ANSI X3.182-1990 methodologies with
a few special considerations and exceptions. The ODV also conforms to
ISO/IEC 15426 per the requirements specified in Section 2. The exceptions and
considerations are related to the instrument's design and mission. The design
incorporates a proprietary analog laser scanner that can be assembled with
various focus lengths to produce different beam spot sizes. The mission is to
not only analyze bar code quality, but also to detect any printer failures, process
failures or media problems. For maximum performance and to conform to
quality specifications, a fixed mounting distance and angle are required. A
beam spot size able to detect errors of the particular print method is highly
recommended. This beam spot size used may or may not correspond to the
recommendations in various specifications that it be related to the X dimension
of a particular symbol, but instead correspond to the printer's resolution or
some other parameter(s) critical in the application. A major philosophy of an
on-line verification system is; if the printer and/or process is operating correctly
and the media has proper reflectance properties, the best print quality for that
particular print method and material is achieved by definition.
Special Considerations
1. Final system tests are performed at the proper focus distance and at an
angle of 22 degrees. Units with common focus distances are checked to yield
analysis results within +/- 4 % of all target values except +/- 3% for the Rmin
calculation.
2. The standard ODV has an 8 inch focus distance creating a spot size that
gathers light equivalent to a 6 mil round aperture. For these models, final test
includes analyzing UPC symbols on the Calibrated Conformance Standard
Test Card for EAN/UPC Symbol Verifiers. Results are checked to be within +/-
4% (+/- 3% for Rmin) of the marked values on the test card.
3. All ODV's use the same laser diode with a wavelength of 660 +/- 10 nm.
Therefore, any ISO/ANSI overall symbol grade calculated by an ODV includes
660 as the wavelength portion of the grade.