[time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

Daniel Mendes dmendesf at gmail.com
Mon Mar 3 10:16:31 EST 2014

Uncorrelated noise improves resolution in certain systems, even 
mechanical ones... it´s called dither:



Em 03/03/2014 11:35, Poul-Henning Kamp escreveu:
> In message <107931.7dbf8887.4045ea69 at aol.com>, GandalfG8 at aol.com writes:
>> I realise the internal reference is already a 10811, but I thought there
>> was some concern that just the use of the external reference facility might
>> be in some way responsible, [...]
> No, I see no signs of that anywhere in my experiments.
> The issue is if the HP5370 internal signals are synchronized to the
> signals you're trying to measure, then you're in trouble.
> I saw the same kind of phenomena running the HP5370 on its internal
> OCXO and feeding the HP3336 ref-in from HP5370-ref-out.

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