...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 <[email protected]> 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 -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
