Scott asks .. >> So I give up - just what exactly is a dry joint?
Dry joint: Electrical context: - A solder joint in which the electrical connection between two conductors has been poorly formed by the solder material; a consequence of incomplete formation or surfaces not properly wetted by the soldering material. Testing for these - as this group has shown - can be quite difficult. For more information on this type of dry joint, visit http://www.circuitsassembly.com Glastonbury Context: - Crushed weed or herbs of various descriptions usually rolled up in light paper ( tabloid newspapers make excellent wrappers) and used exactly like cigarettes. Testing for a dry joint should be done in secrecy as there are legal connotations associated with their use. In the interest of keeping this forum blameless, the quest for more information on this type of joint will be left to the reader. Rastafarian context: - Sensemelia dat bringz I an' I guud vibes man! Jah be prezd! Tess-teeng nat necessary. U av' some', u gretful, U pass it round, U a good frend, but wen U pass it around, keep it an de left 'and side. Night club context: - A night club that has run out of liquor. Testing for these is visual. They will usually have no revelers. Butcher's context: - Leg of lamb of the Halal variety, dried or well done . Testing for these is essential as 'succulent' might be the preferred end result of the culinary process. Surgeon's context: - Quality and effectiveness of lubrication following hip replacement. Testing inevitable. Homeless context: - Welcome refuge on rainy nights. Best regards - Chris -----Original Message----- From: Scott Douglas [SMTP:dougl...@naradnetworks.com] Sent: Friday, October 11, 2002 8:34 PM To: Chris Chileshe; emc-p...@majordomo.ieee.org Subject: Re: Testing for dry joints Chris, So I give up - just what exactly is a dry joint? Scott At 09:55 AM 10/9/2002 +0100, Chris Chileshe wrote: >Hi Group, > >Probably not the appropriate forum but here goes anyway. > >A colleague is finding numerous problems with subtle dry >joints (partial) between connectors and PCBs and is wondering >if there is a way - short of new procedures in process control - that >dry joints can be tested for? > >The specific problem is that the joints appear to be electrically >sound to start with, meaning the units are getting through function >test, but once exposed to endurance (lengthy) tests or worse >still, actual practical use, the gremlins begin to show. The fault >analysis almost invariably leads to a connector dry joint. > >The connectors are rated for 6A DC continuous. > >Any ideas how these can be picked up early or what measures you >have in production to eradicate these problems? > >Regards > >- Chris Chileshe >- Ultronics Ltd > > > >________________________________________________________________________ >This e-mail has been scanned for all viruses by Star Internet. The >service is powered by MessageLabs. For more information on a proactive >anti-virus service working around the clock, around the globe, visit: >http://www.star.net.uk >________________________________________________________________________ > >------------------------------------------- >This message is from the IEEE EMC Society Product Safety >Technical Committee emc-pstc discussion list. > >Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > >To cancel your subscription, send mail to: > majord...@ieee.org >with the single line: > unsubscribe emc-pstc > >For help, send mail to the list administrators: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > >For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > >All emc-pstc postings are archived and searchable on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________ ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________ ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
