Electronics Forum: physics (Page 2 of 40)

Piece parts reel counting

Electronics Forum | Thu Dec 10 11:07:48 EST 2009 | Lorena Flores

Hello! I think the point here to have a reliable counting system. No matter if it is given 5000 out of 5000 or 6000 out of 5000. What Jesus means is that there is a problem because the qty that the label says after the reel is counted doesn't match

Ready, Shoot, Aim!!!!

Electronics Forum | Fri Mar 16 07:46:56 EST 2001 | C. Robert Nelms

David Thanks for telling me about this web-site! Great site! I very much appreciated this message. To be honest, after reading some of the other messages here on this forum, I almost decided that this site was not for me. Seems like most / all o

Best/Common Practice in Blank PCB QC

Electronics Forum | Fri Feb 28 12:02:15 EST 2003 | MA/NY DDave

Hi You are right. I guess some of us missed this point in the way this on line dialog works. I like to put the specification that the PCB supplier must adhere to, on the Physical Print. The Physical print is often used by outgoing and incoming insp

System is too slow, Will memory/speed increase do job?

Electronics Forum | Sun Jun 26 21:52:15 EDT 2005 | thaqalain

After inserting 128 MB,168 Pin,PC100-222-620 (AZEN RAM)(taken out from another computer) alongside present Kingston KVR133x64C3/128,this data is copied from Systeminfo.txt file and for your kind review/suggestions. Total Physical Memory: 126 MB

Re: Moisture ingression on components

Electronics Forum | Fri Apr 14 09:14:29 EDT 2000 | Rich Ziebell

C.Long, Have you thought of using a barcode reader system? Though costly, such a sytem would minimize the room for error and neglect by your operators. Yes, physical tickets would still need to be applied (barcodes labels) but there would be less ef

Smartmedia connector in reflow soldering

Electronics Forum | Sat Nov 23 10:19:39 EST 2002 | davef

This sounds alot like the warping that we all see periodically in BGA. CTE of material is temperature dependent and not temperature changing rate dependent, so you are pretty much hosed by the physics. Regardless, I do like trying like crazy to g

Leaching

Electronics Forum | Sat Apr 26 01:27:33 EDT 2003 | Iman

no S**t, I was going into SMTnet to post a question, on : 1) what is the actual "physics" behind "Leaching" defect? what is the accurate desciption to define this defect? how to eliminate the general causes to this defect? If encounter, what work pr

IPC

Electronics Forum | Thu Nov 10 21:15:39 EST 2005 | davef

Years ago, there was discussion of making a "IPC-A-640" to define requirements for assemblies comprised of more than a circuit board assembly. We don't know what happened after that. As an alternative consider: Telcordia GR-78 - Generic Requiremen

Could use some help

Electronics Forum | Mon May 21 09:06:33 EDT 2007 | davef

Pat: Very descriptive SUBJECT choice. Surface tension: * Soldering and Surface Tension; Champion, JA; Physics Education, V 16, No 2, 1981, pp 98-100(3) Institute of Physics [We have not looked at this, so we cannot comment, but it seems like an appr

PCB moisture content

Electronics Forum | Mon Jul 16 12:03:42 EDT 2007 | davef

We're aware of no industy acceptance standard for max moisture content of a board. For more on moisture levels, get a copy of: "Removing Moisture from Electronic Components and Assemblies", CS Leech, Jr, Circuits Assembly, May 1994. The article disc


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