Dave: appreciate your comments ,it can help many members understand it clearly . we'd better define the term of"Critical contact area " in some IPC standards . thanks sunny At 2010-11-10 06:22:15，"David Bergman" <[log in to unmask]> wrote: From: David Bergman Sent: Tuesday, November 09, 2010 4:21 PM To: [log in to unmask]; '孙该贤' Cc: John Perry Subject: RE: [TGAsia] Critical contact area和 pristine area的定义是否是一样的? Hi Sunny, The intent of Critical Contact area and Pristine area is the same; that is an area for connection that is free of defects. For an edge card contact critical contact area and pristine area mean the same; but pristine area is used for features other than edge card contacts. IPC standards 600/6012 use pristine area for other features such as SMT and BGA lands. I hope this helps. Best regards, Dave David W. Bergman 大山人 Vice President, International Relations IPC - Association Connecting Electronics Industries 3000 Lakeside Drive Suite 309S Bannockburn, IL 60015-1249 USA +1 847-597-2840 tel +1 847-615-5640 fax +1 847-867-1388 mobile [log in to unmask] Skype: davidbergmanipc www.ipc.org From: TGAsia [mailto:[log in to unmask]]On Behalf Of??? Sent: Tuesday, November 09, 2010 12:13 AM To: Listserv TGAsia Subject: [TGAsia] Critical contact area和 pristine area的定义是否是一样的? All: 请教大家一个问题: Critical contact area 和 pristine area的定义是否是一样的?在IPC标准当中能够找到pristine area的定义但是没有发现Critical contact area的定义,两个英文的术语的定义是一样的还是有差异的?因为在IPC的很多标准当中两个术语经常交替出现很令人费解!请大家赐教! Sunny ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 [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] ______________________________________________________________________