In message <[email protected]>, dated Thu, 29 Oct 2009, Dave Wilson <[email protected]> writes:
> >I need to determine what power rating a resistor has to be to >adequately dissipate 0.5J (a 1.2/50us surge of 500V from a 500 ohm >source). Anyone have a conversion formula? It's not a matter of power rating. You need a resistor that will withstand the thermal shock of 1 A being applied over 1.2 μs, in addition to the 500 V applied. It also needs to have negligible inductance. There are companies that make resistors specially for this sort of application. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Help stamp out intolerance! - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
