[time-nuts] Oscilloquartz 3210 Cesium Standard

Bob Bownes bownes at gmail.com
Thu Aug 28 12:35:53 EDT 2014


Is there a similar 'bring it back to life' procedure for the 5061A?


On Thu, Aug 28, 2014 at 12:32 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> Chris,
>
> Do you have a GPS clock?
>
> First turn the operational mode setting from off to second step (ocxo +
> ion pump) and let it stay there for a day or so.
>
> Then, as the oven have stabilized, switch it over to third step, the open
> loop mode, and tune the OCXO up against a GPS reference so that it is very
> near 5 MHz. You use the calibration whole on the front of the clock for
> that.
>
> Then, you turn the operation mode switch to the fourth and last step, the
> closed loop step, and see if it locks up. Let it just sit there and lock
> up, as it takes some time.
>
> It's quite common that OCXOs have drifted outside the capture range of the
> analogue loop, so loosing lock and not being able to attain it again is a
> typical response.
>
> Cheers,
> Magnus
>
>
> On 08/28/2014 04:33 PM, 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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