I proposed the capacitance unit of dBF with tongue firmly planted in cheek. And yes, maybe 10 Log is more proper than 20 Log (hey, 44.5 dB error is as close as I get sometimes).
OTOH, the more I think about it, resistance, inductance and capacitance values in practical circuitry exist over such a wide numeric range that perhaps a logarithmic scale would be appropriate. 470 k Ohms, 0.47 M Ohms, 470,000 Ohms are all 113 db Ohm. Not to mention that the US national debt is currently only about 128 dB$ (yes, I did use 10 Log here, because everyone agrees that money is power) at: http://www.brillig.com/debt_clock/ Ed Ed Price [email protected] Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis >-----Original Message----- >From: Wan Juang Foo [mailto:[email protected]] >Sent: Wednesday, June 26, 2002 7:00 PM >To: [email protected] >Subject: RE: case of units > > > > >Dear all, > >I wonder if dBF is 20 log C or 10 log C ? > >My personal guess is that if VA= V² Z and Z=sC then I suppose >dBF should >carry a 10 log tag. Could Ed be 44.5 dB off the mark? >Just my 2 ¢ worth. (On an aside, I must say this hidden >character thingy >is rather fascinating , cents is [Num Lock] <Alt-0162>) >:-) >Tim Foo > > SNIP > >>-----Original Message----- >>From: Nick Rouse [mailto:[email protected]] >>Sent: Wednesday, June 26, 2002 1:14 PM >>To: emc >>Subject: Re:case of units ><snip> >>Millifarad sized capacitors are now common >>and I have seen one instance of one marked mF. >>With the new double layer supercaps multifarad >>rated capacitors are also available and >>someone is marketing a 28kF capacitor >>or if you prefer 0.028MF >> >>Nick Rouse >> > > >Wow, an 89 dBF capacitor! > >ED ><snip> > ------------------------------------------- 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: [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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
