Some grid connected inverters have a LOT of noise around the zero crossings, so
much so that certain digital power meters won't function as they can't get
frequency lock. I've seen this on the large Parker units as well as the low bid
units out of China. So if you have solar or wind farm alternative energy
projects nearby you may indeed see excessive noise.
Excess noise and high order harmonics from such inverters has on occasion caused
capacitive line filters on nearby equipment to overheat and catch fire.
Peter
On 2/23/2013 7:53 AM, Didier Juges wrote:
"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 <[email protected]>
To: Discussion of precise time and frequency measurement <[email protected]>
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 <[email protected]> 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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