[time-nuts] Oscilloquartz 3210 Cesium Standard
Javier Herrero
jherrero at hvsistemas.es
Thu Aug 28 19:53:32 UTC 2014
Hello,
Then it is a quite different beast to the EUDICS 3120, that they also
call OSA-3120... I note now that yours is a 3210, not 3120 :)
Regards,
Javier
P.S. no, there is no known cure to the time nuts things interest. It
becomes chronic, and only gets worse ;)
On 28/08/2014 16:33, Chris wrote:
> On 08/28/14 05:03, Javier Herrero wrote:
>> Hello,
>>
>> Here is the manual I've. I have also some other documentations, and some
>> Oscilloquartz software for the OSA-5585, but I don't know if they are
>> very useful.
>>
>> Regards,
>>
>> Javier
>>
>
> Hi Javier,
>
> Thanks for that and for the other replies. The 3210 looks like quite
> an early design, with no sign of microprocessors at all. There's a 8
> slot card cage with a load of discrete analog circuitry, 741 op amps
> etc and a couple of boards full of 14 / 16 pin ssi cmos / ttl devices,
> which I guess would be the synthesiser logic and perhaps a state
> machine style startup sequencer. Apart from that, the rest is power
> supply related and what looks like an alarm board with optoisolator
> discete outputs to a 25 way D connector. The step recovery diode (?)
> multiplier into the microwave cavity is a really neat gold plated
> assembly with what looks like a 50r termination (setup tap for
> spectrum analyser ?) and an adjustment trimmer, but am not touching
> that or the many trimpots on the boards or any adjustments until I
> have more info. The tube is from FTS, part number / model 7101.
>
> It seems strange that the 2nd harmonic, meter #9, is zero, since even
> with a tube approaching eol, one would expect at least some
> indication, which is why I think there may be an electronic fault.
> Perhaps the hv power supply module feeding the electron multiplier.
> Will try to measure that, but the area around the tube is really
> heavily rivetted and screwed down in all directions. Looks like a lot
> of the left hand side of the case will need to be disassembled just to
> get at the tube connections. It also had the battery backup option,
> with 4 sets of 3 x cyclon type cells, but with a date code of 1984,
> are seriously dead and have been removed.
>
> This time nuts things seems to be a growing interest and wonder if
> there is a cure ? :-). Recently bought a 1970's era Tracor 304D
> rubidium standard. Again, no lock, but a very well engineered and
> screwed together piece of kit and should be fixable. Collection now
> includes the Z3816, from Ebay US around 7 years ago, a Z3815 currently
> being repackaged, an HP103 with open circuit oven heater elements and
> the 3210...
>
> Regards,
>
> Chris
>
>
>
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