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RE: That's Exactly What I Did

We must be missing something here in the discussion. With your test setup you should see both attenuation at low frequency (from the finite inductacne) and at high frequency (from the shunt capacitance) The dip you are seeing above 20Khz is not the behavior of the SRF and at high frequencies you should be able to track down the point where the capacitance dominates. (typical -3dB point with a 6dB slope just like happens at LF.)

Now in between those two points you will see a peak in amplitude across the choke and that happens at the SRF point. If the peak is not showing up then it may be hidden in the "passband" of the lowpass and highpass filters at which point you need to increase the source impedance in order to "flush it out"

I just swept a choke with 100K and 500K source Z and the 100K SRF was harder to find and with the 500K the SRF peak was clearly there.

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  Michael Percy Audio  

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