thanks for all of your comments on bare board testing i learned a lot and also see better the dark underbelly of this beast
Dennis Saputelli Jon Elson wrote: > > Dennis Saputelli wrote: > > > so how does a 'flying probe' test really work? > > i understand the general idea of a couple of probes walking around the > > comparing connectivity to a 'netlist' made from the gerbers > > > > but it seems to me and i think i read somewhere that this is better at > > finding opens than shorts > > It should ALWAYS find 100% of opens, as it should either test all > possible combinations of points on a net, or walk down the net, checking > from one end down to the farthest end. > > Checking all possible shorts, especially when opens may be present on the board, > is not possible, due to combinatorial explosion. So, they have to use some > sort of algorithm to figure out which nets are most likely to be shorted > to another. nets which pass close to other nets, or have pads adjacent to > another net, are the most likely. It is SUPPOSED to be correct practice > to run the board again after fixing opens, so that the short detection can > have a better chance of finding a short. > -- ___________________________________________________________________________ www.integratedcontrolsinc.com Integrated Controls, Inc. tel: 415-647-0480 2851 21st Street fax: 415-647-3003 San Francisco, CA 94110 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *