非常感谢大家的帮助！ -- Best Regards Lucia Jin 在 2010年3月30日 下午11:43，liyong <[log in to unmask]>写道： > 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 > > 上海浦东张江高科技园区蔡伦路333号浦东创新港 > > 总机:(021) 55287798 > > Http://www.yaogu.org <http://www.yaogu.org/> > > > ------------------------------ > 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] <[log in to unmask]> > Addr.:No.1040 Nanshan Rd.,Nanshan Dist.Shenzhen,Guangdong,PRC. > > ----- Original Message ----- > *From:* Lucia (Yan) Jin <[log in to unmask]> > *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 > This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. > ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity. > > > ______________________________________________________________________ > > This email has been scanned by the MessageLabs Email Security System. > > For more information please contact helpdesk at x2960 or [log in to unmask] > > ______________________________________________________________________ > > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > ------------------------------ > 使用Messenger保护盾2.0，支持多账号登录！ 现在就下载！ <http://www.windowslive.cn/safe/> > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity. ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________