Insertion Loss
The insertion loss graph of an RFI filter shows the ability to attenuate RF noise across the 9kHz to 30MHz spectrum.
Two curves show the performance for both differential and common mode noise.
Differential mode (symmetrical) noise appears as an RF voltage between the phases. i.e. Noise enters a system along one phase line and returns along another. Symmetrical noise is independent of earth.
Common mode (asymmetrical) noise appears as an RF voltage between phases and earth. i.e. Noise enters a system along the phase line and returnsalong the earth path.
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