Electronics Forum | Wed Jun 16 09:45:26 EDT 1999 | Graham Naisbitt
| Could anyone please give me any information or obtainable references concerning proper guidelines for the application of conformal coatings (double comp.type) using both methods of spraying and dipping. Information must also include best instrument
Electronics Forum | Thu Jun 17 08:13:12 EDT 1999 | Clifford Peaslee
Actually, contrary to what I said previously, it may be related to poor connections, which is related to your location. Somehow we would like to start monitoring how well users access the site, but that basically requires users to report stats to us.
Electronics Forum | Mon Jun 14 15:29:49 EDT 1999 | Sergio Luiz Vito
I am looking for more information about: 1) What kind of evaluation can I do to measure the resistance to fall off of a bottom side glueded SMT component?; 2) There is some influence of doble wave solder machine (temperature, flux, etc) in SMDs fal
Electronics Forum | Mon Jun 14 11:44:10 EDT 1999 | Vince Gedgaudas
Has anyone had issues where bottomside double reflowed smt has fallen off in the wave when using voc-free flux? I have verified the hotter profile was not the issue by using an alcohol based flux with no problems.This voc-free flux is also not causin
Electronics Forum | Wed Jun 16 14:14:07 EDT 1999 | Dave F
| Hello, | I am looking for the surface resistivity and volume resistivity of standard fr4 as a function of temperature and /or humidity . can any one help? | Frank: Sorry I'm so late getting back to you. 1 Use either ASTM D5109-94 or IPC-TM-6
Electronics Forum | Fri Jun 18 03:31:38 EDT 1999 | Frank
| | Hello, | | I am looking for the surface resistivity and volume resistivity of standard fr4 as a function of temperature and /or humidity . can any one help? | | | | Frank: Sorry I'm so late getting back to you. | | 1 Use either ASTM D5109-
Electronics Forum | Mon Jun 14 07:41:47 EDT 1999 | Vinesh gandhi
Dear All, We are having a big debate over what is the industry standard in DPPM on the wave sodlering process. is a DPPM of about 800 satisfactory. As per our big bosses it should not be more than 50 DPPM. Is the figure realistic. We are typicall
Electronics Forum | Mon Jun 14 07:23:42 EDT 1999 | Vinesh Gandhi
We are a medium sized PCB assy. house manufacturing about 2000 motherboards a day. There is a major problem we are facing at the wave soldering stage, i.e. warpage of the PCB. As soon as the PCB touches the wave it warps severely from the centre to
Electronics Forum | Sun Jun 13 18:16:10 EDT 1999 | jgodfrey
I am looking into Alpha's system, and would appreciate some feedback from anybody using it currently. I am concerned about about the life expectancy of the foils if they are clamped and unclamped every couple of days, and what happens if one of the a
Electronics Forum | Fri Jun 18 19:41:24 EDT 1999 | KEVIN SIMPSON
| How are you inspecting pcbs post-reflow, are you inspecting all or sampling. The type of assembly involved would be mainly chip components with a mix of actives and a few 25mil and under pitch. | If you sample what are your fault rates looking lik
