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DPM Verification |
 Verification
of the DataMatrix code is becoming more and more important in the
supply chain of Direct Part Mark applications. Particularly at the
point of marking, it is prudent to not only ensure that the code can
be read, but also that the code has been marked within a specified
Quality control.
Various Industry-specific regulations exist as well as general International
Standards for both the Data Matrix code and the methods of the Direct
Part Marking.
It is important to note that certain verification standards that exist
today for printed, high-contrast 2D marks are frequently not useful
in the verification of DPM 2D marks. Today, verifiers will provide
results based on the quality assessment metrics defined in the following
three standards and specifications:
- The SAE AS9132 standard defines metrics for
dot peen, laser, and electrochemical etch marking methods for metallic
parts. In the case of dot peen, the standard calls for measurements
of dot size, dot position, and dot ovality to indicate whether a
mark is acceptable or unacceptable. AS9132 provides guidelines for
first article inspection performed by an inspector with magnification
aids, and subsequent process monitoring as defined by a quality
assurance plan. AS9132 measurements can alternatively be performed
using electro-optical devices.
- ISO 16022 “International Symbology Specification
– Data Matrix” – This is the international symbology
specification for Data Matrix. Reference verification criteria are
provided for measuring symbol contrast, print growth, axial non-uniformity,
and unused error correction. Marks are graded using an A-F scale
where A is excellent and F is fail.
- ISO 15415 “Bar code print test specification”
– This specification provides print quality test specification
for 2D symbols, including Data Matrix. ISO 15415 encompasses a subset
of the metrics defined by the ISO 16022 such as symbol contrast,
unused error correction and axial non-uniformity, with the addition
of metrics for modulation, grid non-uniformity, and fixed
pattern damage.
The Cognex Insight 5110 fixed position reader supports ISO mark quality
metrics for 1D and 2D code verification. The Verification
suite includes the full ISO16022, ISO15415, ISO15416, AS 9132 (Dot
Peen), AS9132 (Laser Etch) as well as Cognex Supplemental
Metrics to allow for Process Control monitoring, and Contract Compliance
for the Automotive, Aerospace, Defense, Pharmaceutical and Healthcare
industries. |
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© Copyright 2006 Acrovision Ltd |
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