[time-nuts] 60 Hz frequency and phase measurement

[Tim Shoppa]

Jim, most of us are satisfied to use a 6.3VAC filament transformer to step down from 120VAC and isolate from the power line.

Tim N3QE

> On Jul 2, 2019, at 5:56 PM, jimlux <jimlux at earthlink.net> wrote:
> 
> There's some designs on the list (using a PICPET, for instance) to measure the local line frequency and phase..
> 
> but the schemes we've discussed require connecting to the power line in some way.
> 
> What about a non-contact sensing approach?  Something you could put in a box and it would pick up the electric or magnetic field as the input?
> 
> Just how strong is the field anyway?  I've always been trying to cancel or shield it or reduce it in some way, so I've never actually measured it in a calibrated way.  A 10cm antenna on a 1Meg scope probe looks like about 40 mV peak to peak (for the 60 Hz component) along with lots of other high frequency stuff (40 kHz and a few hundred kHz in my office) from switching power supplies.
> 
> I realize that in a office/industrial area you'll probably pick up all three phases in some way.
> 
> What about using a small loop? or a magnetoresistive sensor (like the compasses in phones)?
> 
> Has anyone tried any of these?
> 
> 
> 
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