[time-nuts] Subject: Re: Oscilloquartz 3210 Cesium Standard

Azelio Boriani azelio.boriani at screen.it
Sat Aug 30 08:15:31 EDT 2014


...and don't forget that it may have a BVA OCXO: it is not clear from
the pictures but I suspect that it has got a BVA inside.

On Sat, Aug 30, 2014 at 2:11 PM, Magnus Danielson
<magnus at rubidium.dyndns.org> wrote:
> Hi Chris,
>
>> Hi Magnus,
>>
>> Thanks for that and also the notes about initial startup. I guess there
>> may have been other reasons, such as contractual requirements to buy
>> product built in the eu, say for military or the ESA.
>
>
> Sure. I have a bunch of OSA cesiums and did a trim-up of them all, so that's
> basically what I did.
>
>> With regard to startup, more or less followed your route. In pump / osc
>> mode until the meter indicated zero, then into open loop mode and
>> calibrate oscillator against the lab Z3816. Leave for a couple more
>> days, recheck oscillator and switch into closed loop mode. Yet another
>> couple of days and still no 2nd harmonic on the meter and no lock :-).
>> Meter indications are currently:
>>
>> 1-4  Psu voltages,      All ok
>> 5    Cs Oven         +4 divs of 10 = 8v
>> 6    Osc Ctrl            +5 divs of 10 = 10v
>> 7    Integrator         Initially +offscale, loop open, then falls back
>> to zero, loop closed
>> 8    Preamp            -6.5 divs of 10 = 0.325v
>> 9    2nd Harmonic       0, loop open or closed
>>
>> Modulation on, autolock on.
>
>
> The fact that your integrator reading goes down to 0 (mid-point) indicates
> that the first harmonic does get you into locked state.
> The second harmonic is just a quality measure and easy to detect lock on, so
> the lack of lock lamp correlates with lack of 2nd harmonic reading.
>
> Try adjusting your oscillator slighly out of tune and see if the
> integrator tracks it out, and then try adjusting it back to 0 again.
> If so, you do have a lock.
>
>> Put up some pics on Photobucket earlier today:
>>
>>
>> http://s775.photobucket.com/user/NikonFtn/library/?sort=6&page=1#/user/NikonFtn/library/?sort=6&page=1&_suid=140932843589702368659727058955
>
>
> Nice unit, got a bunch of nice stuff I don't have on mine.
>
>> So what am I missing ?. Did fill in the enquiry form at the
>> Oscilloquartz web site a few days ago, but no reply. Should I try again,
>> or are are there some special runes you need to recite before they will
>> talk to you ? :-). Would be quite happy to pay a reasonable fee for a
>> copy of the manual, paper or pdf...
>
>
> Them being swiss in the lovely town of Neuchatel, runes does not come into
> great use for them.
>
> I think that you're cesium core is about the same as mine, so the manual I
> have will suffice, but you should try to get one from them. Looking at the
> pictures, what you got is the same as mine, except that I don't have the
> time section. Wish I had.
>
> Exactly why I found that manual laying next to my bed I'm not quite sure...
>
> Cheers,
> Magnus
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.


More information about the time-nuts mailing list