Electronics Forum | Thu May 26 16:41:00 EDT 2011 | scottp
Here's what I do: - Test Surface Insulation Resistance (we're in the high reliability market and use a test significantly harder than IPC's). I also test SIR in combination with other assembly materials like conformal coatings and wave solder flux
Electronics Forum | Fri Sep 25 17:01:41 EDT 1998 | Steve Gregory
O-H-H-H-H-H-H-H Lawdy, lawdy... My babuh done left me... my dawg pee'd on my leg... my cornflakes are all poopy... don't make me hafta beg... I got's dem backplane blues, o-h-h-h-h-h lawdy..." OH! Hi there! Scared me fer a second...heheh....caugh
Electronics Forum | Thu Jun 03 22:18:36 EDT 1999 | Dave F
| I'm encountering a new problem at my new company that I haven't encountered before in my past life - and that's Wave Soldering VIA holes. | | We've been getting a rash of defects that we call in this company, "insufficient solder in VIA hole." The
Electronics Forum | Wed Dec 05 17:30:02 EST 2001 | davef
How do you know that "approx 450�C" is "too high"? As a side, the temperature on the temperature sensor is: * Inaccurate. * Not the temperature at the solder. Listen, operators are smart people. They have figured-out that they can solder faster wi
Electronics Forum | Mon Jan 28 08:07:44 EST 2002 | JohnW
Sorry I keep forgetting you lot are backwards in the old metric system :0) anyhoo, yes IPC, the bastions of right well as long as your board is only 1.6mm thick (sorry 62mils)say that you need 75% min general and 50% on ground planes. I'd like to se
Electronics Forum | Mon Jul 19 21:33:26 EDT 2004 | davef
Are you talking about small 'volcanos' that burst through PTH solder connections? If so, you have moisture outgassing through the PTH barrels: * Plating on the hole of your bare board is too thin. It should be greater than 1 thou [25um]. * Your bak
Electronics Forum | Sun Nov 20 04:40:12 EST 2005 | KEN
I agree with Davef. If no evidence of gouging or pad damage exists thn I would suspect supplier issue. An easy test would be to load the hole with part and thermocouple and find out what your irons are capable of delivering. Unless you're solderin
Electronics Forum | Fri Jan 19 07:54:56 EST 2007 | realchunks
I believe you are describing a pin in paste process. Not sure where a stencil is involved. Depending on you machine/pump, you can do damage to it by running paste thru it. Paste is a metal and will wear out internal parts. Also, most pastes used
Electronics Forum | Thu Aug 14 21:58:43 EDT 2008 | proy
NO WAY I had seen this 10 years ago, and got into a 'p' match with the PCB fabricator. We had failures after wave solder, the thermal ezpansion caused cracks in the 'knee' where the skinny little trace go's over into the barrel. even if not failin
Electronics Forum | Mon Nov 24 07:36:15 EST 2008 | davef
No, but we find discussions about relative humidity fairly short sighted, because relative humidity is such an imperfect measure of the amount of moisure in the air. Dew point is much more appealing. R.H. = (amount of moisture)/(maximum amount that
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