Electronics Forum | Sat Oct 19 11:48:39 EDT 2002 | davef
Good points, John. Continuing to track on the voiding issue, why remove voids anyhow? * Voids are primarily process indicators. There is experimental evidence that voids retard crack propagation locally around the void on at least on a temporary bas
Electronics Forum | Tue Jan 07 18:07:59 EST 2003 | davef
J-STD-001 prescribes acceptable temperature and humidity ranges for electronic assembly, but does not discuss required instrumentation, nor its accuracy nor coverage. We're unaware of another standard that requires such a thing. The standards of to
Electronics Forum | Tue Jun 29 14:42:55 EDT 2004 | davef
You're correct, for every dumpster full of paper written about solder, there's a sentance written about fluxes. There's dribs and drabs about fluxes in most of the soldering books [ie, Manko, Klein-Wassink, Judd, Strauss, etc] and most of that is ve
Electronics Forum | Thu Sep 02 11:31:19 EDT 2004 | kmorris
Hi: I am wondering what others are doing that use a Static Ionic contaminate test (e.g. Ionograph/Alphametals) in relation to time. Our Ionograph has the option of setting a test time, or setting it to auto-terminate when there is no change in resis
Electronics Forum | Sat Nov 06 06:22:53 EST 2004 | GS
Many Thanks Davef for your continuos great tech support. From my side, I am still fighting against BIC coming with sockets ( still tons of Br-). Even the supllier is surprised about this pbm. But as we know no Standards available to control bulk ion
Electronics Forum | Wed Jan 12 10:05:20 EST 2005 | Dreamsniper
we are using polyimide boards 6 inches x 7 inches, 2.5mm thick, 12 to 14 layers, for aerospace industries. I am using a long bake of 12 hours at 70'C prior to manufacturing or exposure to elevated reflow and wave soldering temperature. If schedule i
Electronics Forum | Fri Nov 11 08:30:12 EST 2005 | GS
HI all, which is the last "though" about the max Pb % allowed/acceptable into a Pb Free Alloy ? For istance inside : - HASL Process Solder Pot Alloy - Wave Solder Pot Alloy ( 400Kg mass average) - Static Wave Solder Pot Alloy - Etc IPC-J-
Electronics Forum | Mon Jan 15 21:54:19 EST 2007 | raychamp007
Dear Friend, Our SMT Production & component ware house RH currently control limit set to 40%RH - 60%RH, but not always achievable, the RH reading measurement are between 38%RH -65%RH. J-STD-001D recommend 30%RH - 70%RH. However it is only a recommen
Electronics Forum | Tue Jan 23 10:15:44 EST 2007 | slthomas
J-STD-001C just requires that the area not be so dirty as to contaminate your product, tools, workspace, etc. If you start counting particles, you're into cleanroom territory. Do a search on ISO 14644-1 for specifics. Actually Wikipedia does a ni
Electronics Forum | Mon Jan 29 14:01:41 EST 2007 | realchunks
Well, they're all "HE"'s, which may be part of the problem (good one Dave) The customer "thinks" there may be a problem but has no actual proof. The part in question is a lug terminal. It's 0.145" by 0.175" and 0.020" thick. They couldn't "see" a
