大家好,
有谁知道IPC-A-610D中关于使用表面安装的印制板,弓曲和扭曲应小于等于0.75%,其他类型板,弓曲和扭曲应小于等于1.5%。这里的0.75%和1.5%是怎么计算出来的?
 
 
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Best Regards

Lucia Jin
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