Optical And electron microscopy had been employed to study the soldered system, exactly where cracks had been discovered at the edges of the SMD transformer. Cross-sectional Investigation also exhibited empty Areas around the cracks, i.e., they may perhaps are already at the middle of structural weak point. 设计的规范度、细致度，直接决定产品的稳定性、寿命、量产良率�?掌握从原理图到 A3:... https://www.jiadi-newmaterials.com/news/pcb-potting-compound-selection-guide.html