Tim, A "quick and dirty", non-destructive way as sugested by my test engineer is to use a thin thermocouple (i.e. 2 x 0,2mm.) and esentially slide it under the BGA. This is not the most robust way because you will get some temperature error (i.e. you are not measuring the solder joints themselves, just the surrounding air under the chip.) If you can afford to scarp a sample of product I would suggest going with Jerry's approach which would be more robust for the accuracy of the measurement. Hope this has helped. Doug Bennett Sales Engineer Heraeus Amersil, Inc. Atlanta, Georgia USA 770-623-5630 ext 4225 [log in to unmask] At 04:56 PM 1/26/98 -0500, you wrote: >Where should I place my thermocouples to determine the best oven profile >for assemblies having BGAs since their leads aren't reachable, and how >should I attach them? > >Thanks > >Tim Stammely >Manufacturing Services & Integration (MSI) > >################################################################ >TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >################################################################ > > ################################################################ TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################