New Equipment | Industrial Automation
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New Equipment | Industrial Automation
Sales Manager: Sandy Lin Email: unity@mvme.cn Skype: onlywnn_1 Mobile(Whatsapp): (+86)-18020776786 XIAMEN YUEHANG COMPUTER ENGINEERING CO.LTD. is a company that professionally engaged in large system DCS spare parts supply. We supply DCS, PLC, M
Electronics Forum | Thu May 06 13:06:36 EDT 2010 | dwonch
Unfortunately nothing ground breaking to report. The board shops analysis (SEM/EDS)showed high levels of carbon and oxygen, likely indicating an organic based contaminate. They are still stumped on where it is coming from. We recieved some boards y
Electronics Forum | Mon Nov 06 12:43:35 EST 2023 | milas
Hi We are mounting an microphone device (SMT package) onto a PCB which has an ENIG finish and, observed some contamination on the underside of the device, post reflow. The SEM analysis shows that the contamination has a high level of Carbon. Where c
Electronics Forum | Fri May 21 12:24:21 EDT 1999 | KA Stillings
I normally handle the soldering issues for this facility but a question was asked of me -- What the H@## is this stuff and what is causing it? Was wondering of I could get some input from any Guru on plating issues. Need info ASAP!!!!!!!!!!!!!!!!!!!
Electronics Forum | Mon Aug 22 23:22:29 EDT 2016 | twhoo
i also notice the carbon and oxygen is high on the defect? Why is that?
Electronics Forum | Sun Aug 23 07:03:09 EDT 2009 | ghepo
OK Eric, is difficult answer at distance without examine the PCB..., anyway in my opinion the problem is the PCB quality. There are two possibility : the crack is between solder and nickel or is between nickel and pad copper. In both situation the
Electronics Forum | Mon Feb 26 09:36:08 EST 2001 | blnorman
ASTM E 443 is a test for sulfur by Oxygen Flask Combustion. Other instruments will detect sulfur (I assume a SEM with EDS capability will pick up the sulfur). We had an addition cure silicone potting compound inhibition problem last year that was t
Electronics Forum | Fri May 21 15:20:26 EDT 1999 | JohnW
| I normally handle the soldering issues for this facility but a question was asked of me -- What the H@## is this stuff and what is causing it? Was wondering of I could get some input from any Guru on plating issues. Need info ASAP!!!!!!!!!!!!!!!!!
Electronics Forum | Sun Nov 21 21:40:13 EST 2004 | John
I'm experiencing an impedance breakdown on an 0805 ceramic cap. In the application, the cap is at a 16V bias at all times. The unit failed in an extremely high humidity condition. We are using a NC flux and have determined there was flux underneat
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