Electronics Forum | Thu Feb 26 15:49:48 EST 2009 | GSx
Hi I am looking for informations/specs about graphite/carbon deposited on PWB as a "spring contcat" or land (? not sure how to say in English). - Are there any Standards (IPC?)who define correct thickness of graphite ? - Are there any Test Method
Electronics Forum | Thu Mar 05 22:13:16 EST 2009 | davef
There is no IPC specification on carbon ink. Consider talking to your ink supplier to develop the proper quality definition that you require. Most suppliers have a good understanding of their product performance, for instance: http://www.coates.com/
Electronics Forum | Mon Mar 02 11:13:59 EST 2009 | jorge_quijano
Hi to everyone, I'm new with the Solder Paste Inspection machines, and I'm doing my first measures and I noticed that I'm getting a solder paste heigth of 7 & 8 mils using a 5.0 mils stencil, with metal squeegees and 0.0 Snap off. are this results no
Electronics Forum | Thu Mar 05 09:54:59 EST 2009 | davef
When you measure "solder paste heigth of 7 & 8 mils using a 5.0 mils stencil," are you measuring the top of a flat brick? Sometimes if you snap-off the stencil too fast, the paste touching the stencil walls form peaks along the edge of the brick that
Electronics Forum | Fri Mar 06 12:38:34 EST 2009 | mgershenson
Is this a manual measurement machine? As already stated, knowing the height of the pad underneath the paste brick is critical to knowing the true height an/or volume of paste. Any decent automated inspection system will have a way to factor out the p
Electronics Forum | Mon Mar 02 15:07:28 EST 2009 | snsmt
Hello All, One of our operators recently placed a PCB inside our reflow and when the PCB came out, the board was dark green! My question is, what would determine if this board is acceptable or not? I tried searching it, but couldn't find a re
Electronics Forum | Mon Mar 02 15:38:08 EST 2009 | kpm135
I would take the board in question and run it through again with your profiler to verify that no one has messed with your oven recipe, or your oven isn't malfunctioning. Also, a before and after pic attached to the post would probably be helpful to a
Electronics Forum | Wed Mar 04 10:36:10 EST 2009 | milroy
Hi If you mean your PCB stayed in the Reflow oven more than the reflow time required for the solder paste specs then I suggest to throw away the board because it would lead over heated solder joints all over the board. Think what could happen to an
Electronics Forum | Thu Mar 05 09:46:12 EST 2009 | davef
Solder mask requirements: * IPC-6012 and IPC-SM-840 contain detailed specifications and information regarding solder mask requirements. * IPC-A-600 defines acceptability of printed boards [analog of A-610 for board assemblies]. Why can't you use A-6
Electronics Forum | Wed Mar 04 11:47:42 EST 2009 | patrickbruneel
I have to correct something from my previous post (before someone else corrects me). You can grow dendrites from any conductive surface (Cu, Ni etc.) but the final stage would be lower SIR. In my experience other metals except for tin do not lead to
