On 3/1/2015 3:10 PM, Ben Hall asked:
Using a zero-crossing detector with the picPET and logging the timing of
each zero-crossing, how do you toss out the other 59 samples each second?
I think I figured out a very obvious way.
~60 Hz AC -- zero crossing detector -- divide by 64 ripple counter
-nuts [mailto:time-nuts-boun...@febo.com] On Behalf
Of Philip Gladstone
Sent: Friday, February 27, 2015 07:47
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Recording mains frequency/phase
[WAS: No GPSsatellites]
On 2/26/15 20:39, Charles Steinmetz wrote:
ben
On 2/27/2015 1:27 PM, Tom Van Baak wrote:
There are many wonderful web sites that deal with power line
frequency; some with live plots. Just google for words like: mains
frequency detect accuracy stability measurement
Been doing just that - fascinating! I'm getting closer to doing some
Mendes dmend...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Saturday, February 28, 2015 10:34 AM
Subject: Re: [time-nuts] Recording mains frequency/phase [WAS: No GPSsatellites]
I´m planning an experiment like that... I designed a board with an OCXO
Subject: Re: [time-nuts] Recording mains frequency/phase [WAS: No GPSsatellites]
I´m planning an experiment like that... I designed a board with an OCXO,
pic microcontroller, power supply, mains interface with optocoupler, and
SD card for data collection.. I plan to sincronize a counter running
of precise time and frequency measurement
Subject: Re: [time-nuts] Recording mains frequency/phase
[WAS: No GPSsatellites]
On 2/26/15 20:39, Charles Steinmetz wrote:
ben wrote:
I'm going to have to build one of these. Assume you have
some sort of
circuit that converts low-voltage AC from
If we all did this, then I realize that we could identify the different
power grids. However, I wonder if there is any interesting variation
*within* a grid. As the electricity flows vary throughout the day, it
seems possible that the phase difference between two people on the same
grid
