Issue link: https://iconnect007.uberflip.com/i/1508761
OCTOBER 2023 I SMT007 MAGAZINE 49 dict the test coverage offered by the machine on the board. e same idea can be applied with other test strategies, such as X-ray, ICT, flying probe, etc. Depending on the machine to be used, the model needs to understand the capabilities, accessibility of the board, and the way some programming features will be used to, again, produce a report of comprehensive test coverage. All the planned or intended strategies need to be summed up together to look at overall cov- erage of the test and inspection process. ese simulation results then need to be analyzed for duplicate and missing coverage. Duplication of coverage between test steps can be optimized to remove redundancies that result in less test time and development expense. In some cases, the results may show that a particular strategy or test and inspection step is not needed at all. An understanding of the results will also show where the lack of coverage is; what compo- models which have been tuned and can contin- uously be tuned based on real test results. Sim- ulation models allow the user to determine the effectiveness of the test and inspection steps. Where are coverage duplications that are not needed? What components still have missing coverage or low coverage from the process that need supplementation or more creative solu- tions to achieve the desired test coverage? A good predictive model of a test strategy will allow a comprehensive report to be gen- erated about the coverage as it applies to the board being examined. e simulation model for each test strategy needs to know the strate- gy's capabilities. For example, if we're looking at AOI, what type of machine will be used—2D or 3D? Will it have good camera resolution, or laser capability for planarity and tombstoned components? With what effectiveness can sol- der joints be examined? e model can then be tuned to reflect the machine to be used and pre-