[time-nuts] Homebrew frequency counter, need help

[Bob Camp]

Hi
> On Dec 2, 2014, at 1:05 AM, LiAng <lllaaa at gmail.com> wrote:
> 
> 
> Bob Camp <kb8tq at ...> writes:
> 
>> 
>> Hi
>> 
>> Looks like something came loose when you swapped around the parts. That 
> or the regulator is very noisy. 
>> 
>> Bob
>> 
> 
> 
> I know why the stop1-start is not stable. There is a noise generator 
> enabled. If start & stop1 is OK, I can change configuration to get 45ps or 
> even 22ps resolution.
> 
> However, does the 45ps or 22ps resolution make any sense while there is 
> 60ps rms noise?

Yes, that’s exactly how you would design it. Resolution is cheap, low noise is expensive. You want noise to be the limit not resolution. 

Bob

> In the interpolation scenario, the time we measure changes. 
> It's not like the laser range measure case.
> 
> 
> 
> 
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