Is there a similar 'bring it back to life' procedure for the 5061A?
On Thu, Aug 28, 2014 at 12:32 PM, Magnus Danielson < mag...@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 >> >> >> >> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> >>> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
