From: Paul
Date: Thu, 28 Dec 2000 14:44:16 +0000
Subject: Re: [TSSP] early idle testing
I wrote: > > If the drive is slightly above resonance, the top > > voltage > > lags the base drive voltage by a little more than 90 > > deg, > > > > Slightly below resonance, the top voltage lags the > > base > > by a little less than 90 deg. Boris wrote: > ---- > By resonance frequency you consider the exact > frequency where input impedance of the resonance > reaches its minimum? > ----- No. Minumum Zin is slightly below resonance. The resonance is where peak top volts occurs, which is where the phase crosses 90 deg. I thought a little more about your comment of a persistent phase other than 90 deg at resonance. You may well get that if you are driving through a primary winding rather than into the base. Cheers, -- Paul Nicholson, x6408, or 01706-815027, pager x6409 or 01399-759276 Siemens Metering Ltd., Manchester, UK. --
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.