Current project is an AC volt/amp/power/power factor meter using an
18F2620. It is a for-fun project.

I digitize one complete cycle of the 60 Hz voltage and current waveforms
using the ADC, saving 256 8-bit samples.=20
I compute RMS voltage and current, and power factor by calculating the
phase shift. Life is good.

But just for fun, I want to be able to calculate the power factor for
non-linear loads, such as a switching power supply.
>From what I have read, I need to determine the harmonic content of the
current waveform.=20

It seems to me that the easiest way to do that is to use a digital
filter to filter out everything above 60 hz.

I've played around with simple digital filters before, to filter noise
from a slowly varying DC signal, but that was sampling the signal over a
long period of time.

What I have is a single cycle of the waveform - 256 8-bit values
representing the waveform.

Can someone point me in the right direction for filtering a single
cycle?

--=20
Larry Bradley =20
Orleans (Ottawa) Canada=20

--=20
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