Electronics Forum | Thu Jul 06 16:13:28 EDT 2017 | barryg
Hello everyone, I was curious if anyone knows what criteria there is for layer to layer registration. I have looked at ipc-600 and 601 and have not found anything or am missing something. We had a small qty. of pcbs sent to a customer and some inner
Electronics Forum | Thu Jul 06 21:24:10 EDT 2017 | heros_electronics
Hi Jack, Haven't you done 100% E-test? there is a registration tolerance. CCD+/-2mil, Manual+/-4mils according to our manufacturing capacitites.
Electronics Forum | Fri Jul 07 09:39:19 EDT 2017 | barryg
Our PCB supplier was supposed to be doing 100% ET but a few of his PCBs were not, and were not marked as tested, so now we are supersensitive. We received some PCBs from a new supplier and one of our inspectors noticed some shift. I was looking for s
Electronics Forum | Thu Aug 31 09:12:54 EDT 2017 | hxamalia
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Electronics Forum | Mon May 26 03:27:00 EDT 2014 | julianf
Thanks for your reply Sarason. I'm aware now that my goals seem very ambitious and infeasible. Let me formulate my problem in an different way that might be more realistic. Is it possible to measure a DIFFERENCE in strain between top and middle la
Electronics Forum | Thu May 15 17:34:17 EDT 2014 | taiji
I always made tests with gauges on top or bottom surface of the PCB, before, during and after the process that we wanted to check. But I never tried to do it on internal layers of PCB. Don't know if that is possible. Regards
Electronics Forum | Thu May 15 09:55:16 EDT 2014 | julianf
Tmo, Thanks for your reply. It gives good advise about how to perform tests. The type of strain gauges that I want to design are inside the PCB at various layers and I want to read the data during the press step. Do you know if these prefabricated
Electronics Forum | Wed May 14 10:20:37 EDT 2014 | julianf
Hello all! For my mechanical engineering study I want to etch a strain gauge in the Wheatstone bridge configuration in a copper layer of an PCB. The goal is to measure the strain occurring in an PCB even during the press process! We can measure with
Electronics Forum | Wed May 14 13:31:22 EDT 2014 | taiji
You should look in to this document: IPC/JEDEC-9704A Printed Circuit Assembly Strain Gage Test Guideline Regards
Electronics Forum | Fri May 16 05:17:13 EDT 2014 | julianf
Interesting. How did you connect the gauges in the press? Our press only has connections for thermocouples. But in essence, it's only a wire and an electical output. If you placed these prefabricated gauges on top and on the bottom surface, weren't
