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IPC-610D defines the degree of barrel fill in PTH (Planting through hole) into three levels, 25%, 50% and 75%. However, in PCBA stage, when using X-ray to inspect PTH, it is often the case that after wave soldering, there will be solder void. If the size of the solder void accounts the majority size of the PTH, three levels of the IPC-610D is often regarded as the standards for approximate calculation...
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