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*To*: tesla@xxxxxxxxxx*Subject*: Re: ESL in MMC`s*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Sun, 13 Aug 2006 18:23:15 -0600*Delivered-to*: testla@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Old-return-path*: <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>*Resent-date*: Sun, 13 Aug 2006 18:24:17 -0600 (MDT)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <chydeUJDyvD.A.QwC.xK83EB@chip1>*Resent-sender*: tesla-request@xxxxxxxxxx

Original poster: acmq@xxxxxxxxxxxxxxxx > Original poster: Finn Hammer <f-h@xxxx> > > All, > > I am building a MMC for an OLTC. This MMC is > designed to last, so it is getting quite bulky. > > Any extra inductance outside of the primary coil > loop is basically unwanted, but in a High C, Low > L, Low V coil it can get *very* unwanted, because > of it`s influence on the resonant frequency of > the primary circuit. It is entering a LC circuit > where the inductance is only 350µF. > > I am therefore going to measure the Resonant > Frequency of this cap, and calculate the > Inductance according to 4*pi^2*F^2*L*C=1 > > I assume that the resonant frequency is due to > the known Capacitance and the sum of inductances. > These inductances being: Inductance internally in > the cap, and inductance of the leads from the signal generator. > > > What I am asking is this: > > How do I exclude the inductance of the leads from > the signal generator from the measurement? Connect the two leads of the signal generator to the capacitor (maybe using a series resistor) and connect the oscilloscope leads to the same points. Look for a notch, that depends only on the series inductance of the capacitor and wiring. With good capacitors in straight line, you shall obtain something around 1 uH per meter of length of the string. Antonio Carlos M. de Queiroz

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