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*To*: tesla-at-pupman-dot-com*Subject*: Re: Capacitor Testing*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Sat, 18 May 2002 12:48:35 -0600*Resent-Date*: Sat, 18 May 2002 12:49:30 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <2_beYD.A.JDB.cIq58-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net> What you really want to do is measure the loss or dissipation of the capacitor at your frequency of interest. A function generator, good voltmeter and some resistors can do this quite nicely... The challenge is in measuring a fairly small "equivalent" resistance in the presence of the capacitive reactance, so you might up making measurements where you need better than 0.1% precision, which is tough... But, in general, the approach is to put cap and resistor in series, apply test signal, and measure voltages. Then, calculate away... ----- Original Message ----- From: "Tesla list" <tesla-at-pupman-dot-com> To: <tesla-at-pupman-dot-com> Sent: Wednesday, May 15, 2002 5:44 AM Subject: Capacitor Testing > Original poster: "Marry Krutsch by way of Terry Fritz <twftesla-at-qwest-dot-net>" <u236-at-earthlink-dot-net> > > Hi All. > > Are there any "easy" methods of testing unknown caps for TC > suitability? Something like a high power function generator that could > push a given amount of current through a capacitor. Maybe amplify the > output of a small generator with a couple of HV MOSFETs and an MOT or > two? Since crummy caps seem "attracted" to me, I'd like a way to test > them without smoking up the neighborhood :-0. > > Is this worth the time of day, or am I just an idiot? ;-) Comments > appreciated. > > Winston K. > > PS- Can I measure how much energy a cap dissipates using a "normal" > function generator, and an o' scope? > > >

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