[time-nuts] HP5065A C-field current is temperature sensitive

[Bob Camp]

Hi

If you hook up a pps into your 5334 from the GPSDO as the “start” and a pulse 
from the Rb as the “stop” you will get about 2 ns resolution.

Tau zero is the sample time used. 3,600 sec sounds a lot like a sample per hour.
If you have a tag each hour your resolution is 2x10^-9 / 3600 = ~6 x10^-13.

======

Given what we now know about the sensitivity of the C field, things like humidity
may indeed be part of the long term drift ….

Bob

> On Sep 1, 2015, at 4:21 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> jra at febo.com said:
>> Attached is a frequency plot of my 5065A ...
> 
> The label at the top says "HP 5334A".
> 
> Your graph has a resolution of roughly 1E-12.  Maybe twice as good.  How do 
> you get that from a 5334?  I can only get 11 digits.  I'm guessing it's 
> tangled up with the "tau0 = 3600", but I don't know what that means.
> 
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
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