[time-nuts] Mains frequency

[Chuck Harris]

Random noise always converts into time jitter.  It doesn't
matter how much you amplify the input signal, noise can push
the detected zero crossing wherever it wants to.

-Chuck Harris

Magnus Danielson wrote:
> On 11/16/2013 09:52 AM, Chris Albertson wrote:
>> Your method tosses out a lot of data.  You can't see transients.  Ideally
>> rather then record a 1 second average you'd record the time of EVERY zero
>> crossing.  It sounds like a lot of data but not really.   You only record
>> 32 bits 60 times each second.  That is 240 bytes per second.
> But you want it filtered to avoid the transients. Those are really not
> that interesting when you measure the grid.
>
> Also, if you use the event trigger method you probably want to use an
> amplifier to increase the slew-rate such that noise does not convert
> into time jitter.
>
> Cheers,
> Magnus
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