On 5/11/07, Jinx <joecolquitt@clear.net.nz> wrote:
>
>
> > That hardly reduces the noise.
>
> It helps to cover the bases though
>
> > The only guaranteed way to get rid of it is to average 8-16 samples
>
> http://www.piclist.com/techref/microchip/a2d.htm

Averaging is not reducing the noise. Average is just the equivalent of
an analogic integrator. And no, the analogic integrator is not
"reducing" the noise. It just integrating it in the result (with other
words is fooling you that there isn't there anymore based on the
theoretical ideea that noise averaging is always zero - which is not
entirely true, sampling time being essential for many types of noise).
The PIC AD can be used for 10 bit with the non liniarities and other
ADC errors specified in the datasheet. 8 bit means you have the last 2
bits always fickering. That shows a hardware problem not an ADC
problem.

Vasile
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