[time-nuts] Logging the grid frequency....

[Didier Juges]

"I am curious how this compares with the zero crossing method."
I suppose it should work much better because this method will not be so sensitive to noise around the zero crossings. It will use the entire waveform.

Didier



Sent from my Droid Razr 4G LTE wireless tracker.



-----Original Message-----
From: Gabs Ricalde <gsricalde at gmail.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Fri, 22 Feb 2013 9:01 PM
Subject: Re: [time-nuts] Logging the grid frequency....

Hello,

I also don't have a Picotest or similar equipment but I've done similar
things by using the line input of a soundcard. Multiply the recorded
signal with a 60 Hz quadrature oscillator, apply a low pass filter then
do some analysis on the resulting phasor. The stability of the sound
card oscillator should be enough for this purpose.

You can measure the frequency difference w.r.t. the 60 Hz oscillator by
taking the slope of the phasor angle (be careful with phase wraparounds)
and you can do this as often as you like. I'm curious how this compares
with the zero crossing method.

On Fri, Feb 22, 2013 at 8:46 PM, Daniel Mendes <dmendesf at gmail.com> wrote:
>
> Hi, I have a Picotest U6200A. I´m trying to log the grid frequency (60Hz) to
> generate data for my work. I need to get data from every cycle. I setup
> their program (it always starts in chinese... very funny) but seems that it
> can only log every 100ms. Questions:
>
> 1) Is that a limitation of the equipment or the software?
>
> 2) Using direct comands, can I get data faster?
>
> Thanks for any help...
>
> Daniel
>
>
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