Dave, Thank you. As Steve pointed out, metal covers need more kV. I am using an equipment of max. 160 kV and until now I was very happy with it, inviting my friends to test BGA's with metal covers , their equipment being too weak. I don't know if we should be happy or not having this discussion, but I have a bad feeling. If there is something we don't know, research should be done. I was just thinking that those who use the "best" equipment, are also those who manufacture the assemblies which require the best quality. Gaby David Hillman wrote: > Hi Gaby! The Xray equipment vendors have told me that Xray tubes that are > less than 100kV have a very low probability of damaging components. Note > the "very low probability" statement - they have not seen any customer > issues with xray damage but they also can't totally rule out the > possibility of damage. We have been using xray equipment with a 52kV tube > and we have yet to have a xray damage issue. I imagine as industry use of > xray inspection of area array increases we will find out how "probable" > xray damage issue will be. And to add one more voice to the discussion - we > have found the using a medium cost xray system (e.g. $30K-$60K) is a > valuable asset in area array component solder process control. The use of > xray equipment doesn't answer every question but having the tool available > is important in several aspects. > > Dave Hillman > Rockwell Collins > [log in to unmask] > > Gabriela Bogdan <[log in to unmask]>@IPC.ORG> on 05/31/2000 11:31:58 > PM > > Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond > to Gabriela Bogdan <[log in to unmask]> > > Sent by: TechNet <[log in to unmask]> > > To: [log in to unmask] > cc: > > Subject: Re: [TN] To X-ray or Not to X-ray. > > Hey, Paul! > Now you got me scared. I hoped that Hals und Beinbruch was for good chance. > You write > about multiple passes, -in short, the process is time related. Do I have to > fear that > if the test takes a long time, I might damage good parts? > Thanks, > Gaby > > Paul Klasek wrote: > > > Take it from you Werner, glad you pull from golf to see us; > > > > 3D machine's orbiting view can see cracks from substrate, > > with the kind human or inhuman experience you and Jerry noted; > > with metal tops it could be still a hazy vision at the best ? > > The likelihood of high efficiency top sinks (metal) > > increasing popularity seems logical, to me (deluded or not), > > meaning to be very interesting for multilayered patients diagnosis? > > > > Did you come across damage factors on X pass repetitions ?, > > i know in med you can burn the bone with multipasses, > > (know cases with 4-6 pass wrist X burns); > > with the intensities required through the metal tops, > > if they are Xable, > > (wonder what's Altera's view on X,seen somebuddy here on Net,please,) > > would there be a possibility of internal damage of ever finer paths ? > > > > I realize this is commercially sensitive laundry, > > hints are good enough answers > > (even no comment, come to think of it) > > > > paul > > > > -----Original Message----- > > From: [log in to unmask] [mailto:[log in to unmask]] > > Sent: Thursday, 1 June 2000 10:17 > > To: [log in to unmask]; [log in to unmask] > > Subject: Re: [TN] To X-ray or Not to X-ray. > > > > Hi Paul, Steve & others, > > It all depends on your volume and the level of assurance you need/want. > > There > > is no question that for some people's operation spending that kind of > money > > is overkill, on the other hand there is no question that X-ray inspection > > with the proper recognition algorithm(s) and settings can improve the > > quality > > of the outgoing solder joints better than any other technique. > > Werner Engelmaier > > > > ############################################################## > TechNet Mail List 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://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## ############################################################## TechNet Mail List 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://www.ipc.org/html/forum.htm) for additional information. 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