[time-nuts] HP 5345A Noise Floor

[Giorgio Barinetti]

Hi Bob,



The current setup is:



Counter locked ( 10 mhz in ) to the Cesium.



Same 10 mhz signal from the Cesium feeds both the inputs and counter is running in “phase difference” so time A-B.



That means the resolution will be hiher, I guess, since the counter is counting the “difference” between the two

Signals, not the whole 10 mhz.



I’m a complete dumdum in maths but I’m sure that somebody here can explain in a simple way.





Regards,

Giorgio.









Hi



According to page 1-3 in https://bama.edebris.com/download/hp/5345a/5345a_6.pdf <https://bama.edebris.com/download/hp/5345a/5345a_6.pdf>



The 5345 is a 2 ns counter. Roughly speaking, that normally gets you around  2x10^-9

at 1 second.



That would suggest there is something a bit off in your setup.



Bob



> On Oct 29, 2020, at 9:26 AM, Giorgio Barinetti <giorgio at barinetti.it<http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com>> wrote:

>

> Hi All.

>

> While I’m waiting for a 5370B to come ( find it cheap and beautiful from France ) I’ve put my old 5345A on a trial, connecting both the

> Inputs to the 10 mhz out from an Oscilloquartz 3200 Cesium Oscillator.

>

> Those are the results. Please advise 😊

>

> Regards,

> Giorgio.

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