准确的弓曲和扭曲的测量方法请参考IPC-TM-650 的2.4.22c

具体的标准可以到IPC的网站上免费下载哦！

弓曲是 （弓曲高度/弓曲边的边长）×100%

扭曲是 （翘曲高度/2倍对角线长度）×100%

 

 
Brave Li

上海耀谷管理咨询有限公司
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Date: Fri, 26 Mar 2010 18:26:12 +0800
From: [log in to unmask]
Subject: Re: [TGAsia] 关于弓曲和扭曲
To: [log in to unmask]




Hello:
 
扭曲的计算方法为：（翘曲高度/板子对角线长度）X100%
弓曲的计算方法为：（弓曲高度/板子长边长度）X100%
扭曲和弓曲的高度可以在校正平台上使用塞规测量。
 
 
 
Best regards 
CS engineer Aiyana/QA Dept.
Suntak Multilayer PCB Co.,Ltd 
mobile phone:13724200756
Tel:+86-755 26068047ext.122
Fax:+86-755 26068048
e-mail:[log in to unmask]
Addr.:No.1040 Nanshan Rd.,Nanshan Dist.Shenzhen,Guangdong,PRC.

----- Original Message ----- 
From: Lucia (Yan) Jin 
To: [log in to unmask] 
Sent: Friday, March 26, 2010 2:50 PM
Subject: [TGAsia] 关于弓曲和扭曲


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 CONFIDENTIALITY
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