Dennis Just small follow up
Flying probe test Test voltage 250 V Leak threshold 59 MOHS Continuity test 200 MA Resistance threshold 10 OHMS Jig Test Test voltage 40 V Test current 100 MA Low threshold 5 OHM High threshold 250 * 10 KOHM Best Regards John A. Ross RSD Communications Ltd 8 BorrowMeadow Road, Springkerse Industrial Estate Stirling, Scotland FK7 7UW Tel (Office) +44 [0]1786 450572 Ext 225 Tel ( Lab ) +44 [0]1786 450572 Ext 248 Fax +44 [0]1786 474653 GSM +44 [0]7831 373727 Email [EMAIL PROTECTED] WWW http://www.rsd.tv ========================================== ----- Original Message ----- From: "Dennis Saputelli" <[EMAIL PROTECTED]> To: "Protel EDA Forum" <[EMAIL PROTECTED]> Sent: Thursday, September 26, 2002 12:58 AM Subject: Re: [PEDA] OT - bd testing > 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 > > whereas the good old bed of nails would (or could?) find both > > anybody know the down and dirty secrets of all this? > > Dennis Saputelli > > > Dennis Saputelli wrote: > > > > it has happened to me twice > > 2 different shops > > they charged for test setup, testing, but there were short all over some > > of them and they were only double sided > > > > Dennis Saputelli > > > > Jon Elson wrote: > > > > > > Bagotronix Tech Support wrote: > > > > > > > With a board that complex, your board vendor had better actually be doing > > > > electrical test, instead of just charging for it and not doing it... > > > > > > What? This is endemic in the industry? I've had to can several vendors > > > for pulling this stunt. But, when they get caught by me, with my (in > > > comparison) quite modest boards, there's no doubt what is going on, because > > > the boards come back with 50% failure rate. IE. 50% of the boards have at > > > least > > > one internal short or open. I usually get the test report from Advanced > > > Circuits, > > > so I know what their yield is on multilayer boards. And, it is somewhere > > > between > > > 50 and 75% on most runs. The 2-sided usually come back at 90% or better > > > passing. > > > > > > So, it is real hard for me to believe that many fabricators pull these > > > stunts of > > > pretending to do electrical test as a routine matter. I think they'd get > > > caught > > > WAY too often. > > > > > > Jon > > > > -- > ___________________________________________________________________________ > 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 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
