[time-nuts] Recommendations for Mains Power Monitor / Logger

Bob kb8tq kb8tq at n1k.org
Sun Mar 11 19:06:33 EDT 2018


Hi

If you pick the “right” STM board, it can handle processing up around 
a megasample. It’s internal ADC’s are more of an issue than the sample
rate. You can only do just so well on harmonics with a 12-ish bit ADC.
Even if you go crazy and get one with a display, they still are pretty cheap.

Bob

> On Mar 11, 2018, at 6:13 PM, Attila Kinali <attila at kinali.ch> wrote:
> 
> On Sun, 11 Mar 2018 14:41:23 -0500
> Dana Whitlow <k8yumdoober at gmail.com> wrote:
> 
>> I'll have to take a look around to see if there isn't something cheap that
>> can run
>> standalone so I don't have to tie up (or wear out) a whole PC for the
>> acquistion
>> process.
> 
> Blub... I should the whole mail....sorry about that.
> 
> How about this: get a uC board (e.g. STM32discovery), replace
> the crystal with a 10MHz input from your frequency reference.
> Use the on-chip 12bit (really just 6bit) ADC to sample the
> sine wave from your mains. Do phasor measurement in software.
> 
> Probably any sampling frequency between 200Hz and 1kHz should
> do the job, Which is slow enough so you can still handle the
> samples with the uC alone and don't need any fancy DSP.
> 
> 
> 			Attila Kinali
> 
> -- 
> <JaberWorky>	The bad part of Zurich is where the degenerates
>                throw DARK chocolate at you.
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