[time-nuts] Datum 4065A Cs Standard Info?

Magnus Danielson magnus at rubidium.dyndns.org
Sun May 11 17:30:16 EDT 2014


Ed,

On 05/11/2014 08:26 PM, Ed Palmer wrote:
> I realize that this question has been asked before, but it's worth
> asking again.  Has anyone come up with any technical info on any of the
> 4065A or any of the other 4065 Cesium standards or the 5045A Cs Module
> that it contains?  I have checked the archives and searched extensively
> through Google.  I have the operating manual for the 4065C, but it looks
> like it was OCR'd and not edited to correct typos so some of the info is
> garbled so a new copy would be welcome.
>
> The immediate reason I'm looking for more info is that I noticed that
> even when I replace the OCXO with a fixed 10 MHz, and the synthesizer
> with a fixed 12.631... MHz signal, the system reports wildly varying
> levels of beam current.  Nominal levels are 2500 +-500 ( I think -
> that's one of the garbled parts), but I see levels from < 50 up to
> 4000.  But I found the beam current monitor point and the level there is
> stable.  So does this indicate another circuit fault, or is it just
> because the system can't control the frequencies?

I suspect that the processor gets fooled by the situation, so the fact 
that you can't jump around cause all forms of levels that it compares 
with incorrect.

You want that DDS solution. This is a processor steered loop, and it 
does a hell of a lot more than the old analog loops did.

Read the patent, that should give you a hint of what it does.

Cheers,
Magnus



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