Perhaps the supply transformers are nearing overload?
Linear phase 50Hz notch filter
Dec 13, 2009
24 Replies
Brown
=20
component.
It is driven by two things, simple rectifiers and third harmonic = reduction=20 as a result of delta windings in three phase transformers.
It should mostly go away in "say" ten years as many things get power = factor=20 and harmonic corrected.
own
t.
nor
I think I read the cheap Chinese offline switchers are half wave rectified. If that is the case, I can see harmonic distortion on the AC as a way of life.
Brown
Kit
ent.
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to op...
if you can implement your filter in DSP, then use a FIR filter.
They are linear phase by definition.
Mark
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