IPC-2141 is on High Speed Design and Controlled Impedance. It is also currently under review. Any suggestions would be welcomed. Dave Hoover (co-chair IPC-2141) --- "Willis, Ken" <Ken.Willis@xxxxxxxxxxxxxxx> wrote: > > There is an IPC spec IPC-6012 that covers this. You > can > get it at: > > http://www.ipc.org/ > > Ken > > -----Original Message----- > From: mappiani@xxxxxxxxxxxx > [mailto:mappiani@xxxxxxxxxxxx] > Sent: Wednesday, June 27, 2001 11:03 AM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Controlled impedance test > requirement > > > > Can anyone point me to where I can get guidelines > (IPC ?)for specifying > controlled impedance testing for PCBs? My company > uses several different > bare board manufacturers and all of them have > different ideas about how > many cards , or panels, to test in order to satisfy > our controlled > impedance requirements. MY current documents only > state that we require > documentation that testing was done. Some vendors > place their own test > coupons on the panels and test each panel, some use > the test strips that I > put on the design. Recently, a vendor wanted to test > one or two cards, out > of 2500, and claim that his process is good enough > to guarantee that the > entire run complied to our requirement. Is this a > reasonable expectation? I > didn't think so and asked the vendor to do more > testing. I understand that > testing takes time and money, but I do expect to pay > a more for this > testing. > > I would like to add some statement or formula so > that all the vendors are > testing the same percentage of cards (whatever it > should be). > > Thanks , > > Mario R. Appiani > Senior Hardware Engineer > ATTO Technology, Inc. > 155 Crosspoint Parkway > Amherst, NY 14068 > Tel. 716.691.1999 Ext. 130 > Fax. 716.691.3724 > email: mappiani@xxxxxxxxxxxx > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in > the Subject field > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the > Subject field > > List archives are viewable at: > //www.freelists.org/archives/si-list > > Old list archives are viewable at: > http://www.qsl.net/wb6tpu > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in > the Subject field > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the > Subject field > > List archives are viewable at: > //www.freelists.org/archives/si-list > Old list archives are viewable at: > http://www.qsl.net/wb6tpu > > __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/ ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu