I have tried to measure the power line frequency with spotty success. My best
results came from a period measurement, as many periods as the counter can
accumulate. Due to noise, one is never sure at quite what point the source is
measured. Perhaps a brick wall filter would clean it up for a more reliable
measurement.
Of course, at 60 Hz the period is 16-2/3 milliseconds. So the counter should
properly show a 1 followed by a row of 6s, with the last digit bouncing between
6 and 7 most of the time.
If there is a filter used, it will not only remove noise but also short term
variations. But generatlly speaking you don't want to measure those, unless
you are trying to evaluate a rotary generator.
Getting this reading can be a challenge.
On Tuesday, July 2, 2019, 10:01:03 PM PDT, jimlux <[email protected]>
wrote:
On 7/2/19 4:09 PM, Dana Whitlow wrote:
> I've always noted that casual attempts to pick up 60 Hz with small antennas
> etc see more harmonics and other trash than actual line frequency. But if
> you're in an office environment, why not plug something in? It's quite easy
> to build a simple passive diode clipper/filter that will plug into a wall
> outlet and
> which will provide a sort of soft (but clean) squarewave at a voltage level
> convenient for lab instruments and with good protection against big spikes
> and
> other trash riding on the line.
Safety approvals are one obstacle (of course one could use a AC wall wart).
Actually, it's because someone asked me about a science experiment where
you'd place them in a neighborhood outdoors.
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