The current "A" and "B", or "A/B" coupons test the largest component hole and its associated pad size that will fit on the coupon and the smallest via hole with its associated pad size. The "A/B-R" adds the tightest hole/pad relationship on the board, which is not always caught in the other coupons. It also has registration holes/pads that can be electrically tested as well as microsectioned. At one time it also had traces from which one could possibly determine etch-loss. I'm not sure if the final version had them though. Chris, are you out there? Tom Louis Hart <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 07/30/2010 05:10 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Louis Hart <[log in to unmask]> To [log in to unmask] cc Subject [TN] A/B-R coupons TechNetters, does anyone have a description of the A/B-R coupons that has been under discussion by IPC? I would like to have an understanding of how it works and what it accomplishes. Thanks for any information. Louis Hart Compunetics Monroeville, PA USA [log in to unmask]<mailto:[log in to unmask]> 412-858-1272 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------