Hi James, Good to hear from you again. If you have a chance say hi to Greg Lewandowski for me. Test patterns. Question 1, which test patterns are you asking about, or is this a "all inclusive" test pattern. There are test patterns for microsectioning, soldermask adhesion, impedance, etc, etc. As far as I know, and have done this in cases, you can design the test patterns onto the artwork (database) yourself, or you can ask the fab house to fab your boards per a specification which defines what "test coupons" are required (and the spec defines what test criteria they must be fab'd to). If you are asking for the "test coupon" per IPC-D-275, that might be easier for the fab house to add with their CAM software, and it will probably coincide with how the actual board is produced (one per panel, two per panel, left side, right side, etc.) But, I have worked at a place where WE DID add the patterns to the artwork. Look at IPC-RB-276, it will give you a very good idea of what the board house should be building your boards to. It shows most of the coupons and defines many of the test the fab houses should follow. If you are asking for impedance "coupon" patterns, that might need to be specified by your group (the engineers know better what is allowable for impedance testing). The fab house will add impedance patterns, but the test might be too generic for your design. Good luck, if you need more help give me a call. See you at PCB West in March! Mitch Morey Sr PCB Designer ComStream Corp San Diego CA 92121 Email: [log in to unmask] Check out: www.comstream.com >>> James Patten <[log in to unmask]> 02/10/98 06:24am >>> Who should create test coupons? Per what? We supply 'one'-up design database to board supplier. Thanks. ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################