Electronics Forum | Wed Apr 19 10:48:36 EDT 2017 | robl
Thanks for the suggestion Rob, this might work > for us in some cases. In most cases though, I'll > need multiple coupons per PCB purchase (a coupon > per coating "setup"). > > Currently talking to > some PCB suppliers to see if anyone can of
Electronics Forum | Mon Jul 13 11:21:52 EDT 2020 | dontfeedphils
1) Viscosity measurement of the coating prior to spray, spraying and charting metal coupons for sprayed and cured thickness of the coating at various points of the conformal coat run 2) Yes, manual inspection 3) No, it wasn't able to inspect with t
Electronics Forum | Mon Nov 05 20:34:03 EST 2001 | davef
What�s the problem? There area many heat related failure mechanisms in bare boards. You can damage boards with heat several ways. A couple favorites [Don�t try this at home. Perform on a closed track by professional solders only.] are: * Put a
Electronics Forum | Sat Feb 14 19:35:51 EST 1998 | C. Lao
Mr Lao We have some specialist knowledge on this subject and offer both equipment and services for these tests. My first recommendation is that take coupons manufactured by your PC Fabricator and then samples at each manufacturing stage: Bare coupon
Electronics Forum | Thu Jul 27 14:24:10 EDT 2000 | Alan Aben
We are currently working with a ceramic substate boards that come as a eight up panel with a coupon around the edge. I am looking for tooling that can be used to seperate the finished boards out of the panel
Electronics Forum | Mon Jul 23 12:26:10 EDT 2007 | jdumont
We run a small piece of FR4 with a "thickness test" pattern before production and measure it after with a digital micrometer. Then we save the coupon with the W/O # written on it.
Electronics Forum | Tue Jul 24 13:41:41 EDT 2007 | jdumont
We just measure the coupon before and after. We are always btw .002" - .003" acrylic. No auditor will say a word if you are doing this much control. Unless its NASA I suppose..... we've never had a problem with any of the avionics guys doing this tho
Electronics Forum | Tue Apr 18 14:43:04 EDT 2017 | dontfeedphils
By the time they've reached me/conformal coat they're depaneled (assuming they were panelized at all). Also looked at the tape dot method, but that's a no go as well due to coverage needs.
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Electronics Forum | Thu Sep 23 15:49:45 EDT 2021 | stephendo
See if there are any board shops near you. One might provide scraps in exchange for name dropping.
