Hello,

    I'm making an RMS voltage measurement with the PIC at one of my
circuits.

    Now, how can I get a precise result if I don't know the frequency and
format of the waveform going to the PIC A/D?

    I mean, if the wave is very clean, like a pure sinusoidal, I could try
to sample it between two zero-crossings and I will have a very precise
value. But what about if it does have some loud harmonics? For example, if
it's a sine with 100Hz plus a sine with 187Hz, both mixed and with the same
intensity, the zero-crossings will be all over the place so I can't sample
between two zero-crossing because the values will be meaningless.

    Any ideas?

    Thanks,

    Brusque

-----------------------------------
Edson Brusque
Research and Development
C.I.Tronics Lighting Designers Ltda
(47) 323-2138  /  (47) 9993-6453
Blumenau  -  SC  -  Brazil
www.citronics.com.br
-----------------------------------

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