[time-nuts] FA2 counter

[Wes]

An impedance sweep of the input might give a clue about the LPF.  When I get 
mine I'll measure it.

On 9/27/2019 11:43 AM, Mark Sims wrote:
> A list member did some experimenting with the unit and came up with this very useful information:
>
> "press and hold RST button, then MODE toggles LPF (low pass filter), GATE toggles input
> impedance"
>
> I wonder what the LPF cutoff freq is?
>
> I am currently doing a noise floor test (connect ref out to input) on my FA2.   The initial (12 hour) results are REALLY good...  ADEVs at long (10000+) tau are in the high E-15 range.  I'll post results after I get 24 hours of data.
>
> That annoying freq offset of the FA1 is gone.   A 12 hour average of the FA2 freq readings is 10,000,000.000 001 Hz  (FA2 clocked by a 5071A).
>
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