[time-nuts] FE-5440A cesium clock help

[paul swed]

Emmanouil
It sounds like you are very lucky to have obtained a working CS reference.
I speculate it may be set for a different time scale. There is usually a
setting that can be adjusted. Check the manual. That may be the harder item
to find. Good luck.
The other thing I have run into at least on HP 5061a is that the c-field
was set for a different tube and that forced a offset that was large.
Though I have to say .003 hz seems really large to me.
Regards
Paul
WB8TSL

On Thu, Oct 31, 2019 at 8:02 AM EMMANOUIL MANTZARAS <sv1bke at usa.net> wrote:

> Hallo group
> I recently acquired an FE-54440A cesium beam clock. I do not know nothing
> about his history. Seems to be connected to the mains by the previous
> owner (a
> surplus broker).
> The meter readings seems correct. Supply voltages are ok, Vac-Ion current
> reading is about 0 (strange because that i believe that the unit was in
> storage for a long time).
> After about 20 minutes the cs and osc ovens stabilized. With loop open the
> beam current peaks at the correct oscillator frequency. The unit turns in
> "operate" condition when the loop is closed. The second harmonic level is
> ok
> with little fluctuation. With unit in "operate" condition and after 12
> hours
> of warming, there is a constant frequency difference of about 0.003 hz
> from my
> two  Z3801 gpsdos. Any idea about this condition? Any help is appreciated.
>
> Regards
>
> Emmanouil Mantzaras
> sv1bke
>
>
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