Results from 2007 Industry Defect Level and Test Effectiveness Studies

摘要

To select an optimal test strategy, good knowledge of defect levels and test effectiveness are two very important factors to include. In 1999 an industry defect level study was completed and was often referred to as the "One Billion Solder Joint Study". The content of this study was presented in several papers and articles. Other industry defect studies have also been done, A study was performed in 2007 with data from 14 different companies from Asia, Europe, and Americas and with data from around 3.7 Billion solder joints inspected. This paper will present result from this updated study.Test Effectiveness has also been presented in several papers. A test effectiveness study is a way to evaluate a test method's effectiveness to detect defects and is probably the most objective way to measure these very important characteristics. This paper contains updated data from this type of study. Effectiveness from ICT (In-circuit Test), AXI (Automatic X-ray Inspection) and combined results from AOI (Automatic Optical Inspection), FT (Functional Test) and MVI (Manual Visual Inspection) will be presented.