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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