[time-nuts] HP 5345A Noise Floor

[Bob kb8tq]

Hi

Ummm ….. errrrr …… not so much :)

The time base of the counter is only just so good. 

I would guess that there is a glitch somewhere in the data transfer / data file formatting. 

Bob

> On Oct 30, 2020, at 1:14 PM, Giorgio Barinetti <giorgio at barinetti.it> wrote:
> 
> 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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> 
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