I read in !emc-pstc that Ralph McDiarmid <[email protected]> wrote (in <67C475A5ECE7D4118AEC0002B325CAB60581A5EF@BCMAIL1>) about 'CISPR 25 Conducted Emissions (Current Method)' on Fri, 19 Dec 2003:
>In terms of power change in the system as a fuction of resistance (or scalor >of impedance), then I expect it should be 10logR "dB(Ohms)" > >Why not use dB(ohms) if dB(V) is considered a valid unit? I tried to explain that. In many places in the standards, 50 ohms is described as '34 dB(ohm)', which is the '20log' value. The same applies to 377 ohms = 51 dB(ohm). For me, it doesn't matter so much that '20log' is inconsistent with the definition of the (deci)bel, but that there is no certainty whether a given 'dB(ohm)' value is a 20 log value or a 10log value. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
