[time-nuts] Mains frequency

[Magnus Danielson]

On 11/16/2013 03:13 PM, Chuck Harris wrote:
> 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.
You are missing that you can alter how much trigger jitter you get.

Cheers,
Magnus

>
> -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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