Hi > On Dec 9, 2014, at 7:45 PM, Bob Stewart <b...@evoria.net> wrote: > > Thanks Bob, > > I got the Monitor software just now. The unit has 92,902 hours on it, which > is a bit over 10.6 years.
So as usual I owe PHK another beer. He guessed that one right. > I need to head out the door, but here are a few values from the screen. > I'll figure out how to get a status log out of it later. > > Clock Servo: > Ramsey Error 0 mv servo looks fine > Rabi Error -1 mv > OCXO CV 3151 mv OCXO tune at 3.1V which would be fine on a 5V tune part. > Deviation 194 > > Zeeman Servo: > Ramsey Error 0 mv > Rabi eError -28 mv > C Field CV -32 mv > > Cesium Oven 4.80 V > EM Voltage 8.00 V > Ion Pump 23 uA don’t know what this model normally reads. Others may have some input here. > C-Field 19.10 mA > Ionizer 0.87 V > Mass Spec 14.10 V > > The monitor checks every 10 seconds, so these are a bit dynamic. So, is this > in good health, or do I need to worry? The simple fact that it’s up and running in 16 minutes is a major “one up” compared to > 90% of the under $4K Cs’s on eBay. Best bet is you will get a few years out of it. One approach is to keep it turned off most of the time. Bob > > Bob > > From: Bob Camp <kb...@n1k.org> > To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency > measurement <time-nuts@febo.com> > Sent: Tuesday, December 9, 2014 6:11 PM > Subject: Re: [time-nuts] PRS-45A > > Hi > > Somewhere in / on the beast there should be a magnetic field adjustment. You > play with it (within reason) to get the thing “on frequency”. The real > question being: do you care that it’s 1x10^-13 off frequency? In most cases, > the answer is no and you move on. > > Yes, if you are going to do the adjustment thing, figure out a fixed location > before you go to all the trouble. Also let it sit for a bit to “settle in” to > the local mag field. I would not play with any adjustments for a week. > > Bob > > > > > On Dec 9, 2014, at 6:22 PM, Bob Stewart <b...@evoria.net> wrote: > > > > Subject changed, as I inadvertently stole Dan's thread. > > > > Hi Bob Camp, > > You wrote: "Looks perfectly normal to me. Your Cs is sensitive to magnetic > > field. Have you “zeroed” it out? No of course not, nobody does. (almost > > nobody …). " > > > > What does it mean to "zero out the magnetic field" for a Cs? Sounds like I > > need to align something to local magnetic north. What? I suspect that > > figuring out a way to mount it to the wall (no rack system here) is going > > to be my next priority. It can't safely live on my bench or the floor with > > all those perforations in the case covers. > > > > The people at Symmetricom indicated I should be able to download the > > monitor software, but the registration process seems to take some time. > > Hopefully that gets resolved soon. > > Having this thing hooked up just for this short time has pointed out some > > problems that I couldn't see without a reference that I trusted. > > > > Bob > > > > > > > > > _______________________________________________ > > 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.
