Electronics Forum | Fri Mar 28 04:57:41 EST 2003 | emeto
more heat.But that's not correct!If convection there are air flaws and bare board has lower temperature than a board with high density.When you have elements on board you hava a vortex and the air flaw invreases the temperature.
Electronics Forum | Tue Nov 10 12:30:55 EST 2009 | thanh
hi all! i have a 5 zone BTU (V70) have it set up at 120, 150, 180, 190, 230 and 22 IPM. but i having 1 here 1 there 0402 tomstone, need advise how to set up the best profile to avoid tomstone. i'm using INDIUM 6.3 W.S lead paste. thank you.
Electronics Forum | Tue Nov 10 15:01:50 EST 2009 | rgduval
Check out this paper: http://www.xs4all.nl/~tersted/PDF_files/Plexus/tombstoning.pdf You can also search the SMTnet archives for more information. If you're tombstones are random as you describe, likely the problem is not with the profile; but som
Electronics Forum | Fri Dec 02 10:11:01 EST 2016 | tombstonesmt
We successfully accomplish this on almost every product we have using our BTU Ovens.
Electronics Forum | Thu Mar 31 08:50:18 EDT 2011 | rgduval
While you're waiting, consider giving your paste manufacturer a call. They should have a database of recommended, or starting point profiles based on what oven you have. cheers, ..rob
Electronics Forum | Wed Mar 30 17:32:55 EDT 2011 | gaz
Hi, We are using ws488 sn100c paste. Anyone have a profile for a 5 zone oven that has worked well for you?
Electronics Forum | Wed Apr 06 11:58:38 EDT 2011 | gaz
ok, thanks very much for your help.
Electronics Forum | Mon Jan 09 19:25:15 EST 2017 | fadzril
It shouldn't be any issue if you measure the top reflow settings using bottom profile board & the results are OK. To common the reflow profile, both bottom & top profile measurement are taken & analyzed. This, too, can be applied, even for differen
Electronics Forum | Mon Apr 04 12:39:00 EDT 2011 | gaz
This VIP70 has thermocouple inputs, so I'm hoping that's a good enough profiler. I tried a fairly different profile than you mentioned, so will test your settings today as well. If anyone has opinions, please jump in. Thanks!
Electronics Forum | Wed Jan 25 00:29:22 EST 2017 | cmarasigan
This is our practice already, common profile both sides and we perform it during NPI stage. As long as zone settings are the same and profile requirements are meet, we consider it as same profile and no need to re-profile from bottom side process to
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