[time-nuts] Ultra Stable Rb

[Mike Ingle]

respect.

On Wed, Apr 8, 2020 at 3:46 PM <martyn at ptsyst.com> wrote:

> Hi Guys,
>
> Just though you'd be interested in my prototype rubidium frequency standard
> I made in the 1990's.
>
> http://www.ptsyst.com/RFS10-FrequencyDrift.pdf
>
> I have measured its frequency at random intervals for the past 18 years.
>
> Its never been adjusted and is just free running.
>
> It was turned off in 2005 and sent to a customer in Japan for a few weeks,
> then returned and turned back on.
>
> For the past 18 years its stayed within plus/minus 3 x 10E-11.
>
> The overall linear drift is something like 1.85 x 10E-13 per month.
>
> This is not an advert.  There's no way any of our production units are as
> good as this one, well I assume so as I've never measured any for 18 years
> continuous!
>
> Its now over 25 years old, have hardly ever been turned off.  Any day I
> expect it to fail, but it keeps on running!!
>
> Regards
>
> Martyn
>
>
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