This blog outlines variations in 2D symbols and tracks symbol readability for three parameters of quality standards. The purpose of Data Matrix symbol veriﬁcation is to ensure reliability and consistency of symbols based on the strict criteria outlined in quality standards such as: – ISO/IEC 15415 -AS9132
ISO/IEC 15415 Evaluation Parameters
The ISO/IEC 15415 standard specifies the methodologies for measuring, evaluating, and grading 2D symbol characteristics in order to indicate the quality of the mark. In addition, the standard identifies possible causes for symbol degradation. Users with less than optimal symbols due to problems with marking methods or substrate incon- sistencies can use this information to correct and improve their marks and achieve better symbol quality.
AS9132 Evaluation Parameters
The AS9132 standard specifies uniform quality and technical requirements for Data Matrix direct part mark (DPM) symbols on metal substrates such as metal, PCB, or plastic. Direct part marking methods ad- dressed in the AS9132 standard include: dot peen, laser etch, and electrochemical etch. Manufacturers of aerospace compo- nents are directly affected by the AS9132 standard. The standard mandates that gen- erally the maker of the part determines the location of the symbol. To determine ideal symbol location, manufacturers should posi- tion the symbol so that it can be illuminated evenly from all angles.
AIM DPM Quality Guideline
The AIM DPM Quality Guideline was developed to assess the symbol quality of direct part marks. It defines modifications to the measurement and grading of certain symbol quality parameters.