Electronics Forum | Tue Jun 26 21:41:10 EDT 2007 | davef
4.4 Determine the amount of flux on the board. 4.4.1 Get a piece of corrugated cardboard and a weighing scale accurate to 0.01 grams. NOTE: Use cardboard with alcohol fluxes to slow their evaporation and get good data. 4.4.2 Weigh the cardboard. 4.4
Electronics Forum | Fri Oct 11 05:49:16 EDT 2002 | jason
Hi, Recently I am given a task to perform a drop test on a cardboard tote box. Inside is 180 pcs of assembled PCBA with cardboard dividers. But it was unable to withstand the drop test and thus the some of the boards are damaged. Does anyone ha
Electronics Forum | Tue Jan 18 08:40:42 EST 2000 | Dave F
Hey John: Chrys wrote a good description on calculating flux density a while back. Here is our version of her procedure: 4.3 Determine the amount of flux on the board. 4.3.1 Get a piece of corrugated cardboard and a weighing scale accurate to 0.01
Electronics Forum | Tue Nov 29 17:18:26 EST 2022 | davef
Yes, electronics manufacturing is a volume producer of cardboard waste. If the components are ESD-critical, cardboard and most plastics are not ESD safe. Static charges can be generated on these materials during handling by the friction of dissimila
Electronics Forum | Fri Aug 22 09:07:22 EDT 2008 | blnorman
Sulfur is probably the culprit. Board supplier should be providing boards with anti-tarnish sheets between the individual boards. Also, cardboard is a major source of sulfur and so boards should not be shipped in cardboard.
Electronics Forum | Mon Aug 04 12:38:25 EDT 2008 | blnorman
Avoid cardboard boxes as well. They are sulfur bearers, and silver has an affinity to form silver sulfide.
Electronics Forum | Fri Jun 22 14:16:28 EDT 2007 | patrickbruneel
I agree with the down to earth, low tech but very effective peace of card board and is far better then trying to measure Mg/Inch sq with a volatile media. The only addition I would like to make to �Real Chunk�s� advice is: Dry spots on the cardboard
Electronics Forum | Tue Jun 02 12:57:15 EDT 2009 | operator
Hello, I have searched endlessly to get a good description of how these are manufactured and exactly how they are supposed to work. I have yet to find anything comprehensive. Our CEM ships our PCBs to us in plain cardboard boxes with Conductive Corr
Electronics Forum | Tue Oct 15 12:07:55 EDT 2002 | kenbliss
Hi Jason First, I would not use real parts to test. Second talk to your cardboard box supplier they should be able to advise you on this, they should have the test results from the box capacities they sell to start with. Are you using this tote bo
Electronics Forum | Wed Apr 28 13:33:48 EDT 2004 | Rob
Thanks to all. The way I've been doing it has been crude and very similar to your method. I make an imprint of the bottom side and cut out areas where components sit and this imprint transfers over to a cardboard. When it comes time to run the second
