Maxim and LTC make DC accurate filters. Pretty noisy for use with ADCs by modern standards. [I designed some of the Maxim DC accurate parts and the ladder filters, but not those 5th order filters.]
You are trying to get a free lunch here. This parallel filter scheme isn't going to fly.
Perhaps the supply transformers are nearing overload?
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.
ion
ctor
to op...
if you can implement your filter in DSP, then use a FIR filter.
They are linear phase by definition.
Mark
Have something to add? Share your thoughts — no account required.
Ask the community — no account required