Lucia 
 
You can refer to IPC-600G, then go to IPC-TM 650 2.4.22.
 
If more question, tell me freely. 
 
Jason L 
 


>>> "Lucia (Yan) Jin" <[log in to unmask]> 3/26/2010 2:50 pm
>>>
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？
-- 
Best Regards

Lucia Jin 
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