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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: Noisey Earthground???? posted by Jacques on August 29, 2005 at 04:26:27:
You wrote:"As for mains differential RF conducted perturbation, above 20MHz, most are
cut off by the common mode filter and the X capacitor which follows."I'm retired but fortunate to have a neighbor who works for Agilent. He helped me measure the self-resonant frequencies of some 0.01 microfarad capacitors with an HP 8753B Network Analyzer one weekend afternoon.
My primary interest was in the mystery capacitor used in the Walker High Definition Links, but one of the comparison samples was an X-rated ceramic capacitor taken out of an integrated IEC chassis plug and noise filter.
Even though it was physically the smallest of the samples, it had the lowest resonant frequency, around 15 MHz.
I have not made measurements on the coils used in these filters, but they also have self-resonant frequencies. The combination of these resonances will keep the filters from functioning for noise above some frequency. I'd expect this frequency to be in the neighborhood of 20 MHz.
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Follow Ups
- Self-resonance of X capacitor. - Al Sekela 11:56:19 08/29/05 (6)
- Re: Self-resonance of X capacitor. - Jacques 01:11:21 08/30/05 (5)
- Re: Self-resonance of X capacitor. - john curl 15:00:03 08/31/05 (3)
- Re: Self-resonance of X capacitor. - Jacques 07:29:01 09/01/05 (2)
- Re: Self-resonance of X capacitor. - john curl 07:55:28 09/01/05 (1)
- Re: Self-resonance of X capacitor. - Jacques 08:14:42 09/01/05 (0)
- Thanks for the comments. - Al Sekela 14:15:55 08/30/05 (0)
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