I'm surprised you care about partial breaks. The reason they are hard = to detect is because their effect is minimal. I'm not sure a TDR would = catch most of them. Even X-ray or visual inspection would probably be = prone to missing them. On the other hand, if you wait for a more substantial failure (an open), = they are much easier to test for and detect (by orders of magnitude, I = would think). Once a simple (and quick) continuity test identifies the = open, TDR can be used to isolate the exact location of the open. You = might then be able to locate partial breaks (of adjacent traces, for = instance) in that vicinity. Am I missing something? Jeff Loyer -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Jackson, T L Sent: Tuesday, October 21, 2003 11:18 AM To: SI-List Cc: Johnstone, Ben Subject: [SI-LIST] Rigid-Flex Testing Does anyone have a good method for detecting partial breaks in a trace = in the flex portion of a rigid-flex PCB? TJ Thomas L. Jackson, P.E. Senior Staff System Engineer Department L1-50, Remote Sensing System Engineering Lockheed Martin Space Systems Company Building 149 1111 Lockheed Martin Way Sunnyvale, CA 94089 Telephone: (408) 742-2013 Facsimile: (408) 742-7701 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages=20 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list 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