Le 27 sept. 2013 à 21:16, Tom Van Baak a écrit : > Hi Mike, > > Cs tubes with "S" are standard-performance; tubes with "H" are > high-performance. You can get that from the tube label, or from the front > panel S/N. Don't trust the black dot on the rear of the instrument: frames > change, tubes change, Sharpies add dots, acetone removes them. > > It depends on what you want the 5071A for. National labs keeping timescales > prefer the H tubes since they are several times more stable than the S tubes. > Casual labs prefer the S tube since they last much longer than H tubes. You > have a standard tube.
I thought so, but the figures looked ok so I went for it anyway. > The good news is that it appears to work. Surplus, working, 5071A are not > common. > > Your frame and tube S/N are quite low, meaning old. But I don't know of a way > to tell if the instrument has been used a little or a lot during the last 20 > years. There's no "running hour" meter in the tube itself, the hardware, or > the software so AFAIK there's no way to tell how used it is. Shame, especially considering that it must have cost around 50k new. > But do read: > www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA484993 > www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA508048 > 5071A_FAQs_Symm_Web.pdf > www.ke5fx.com/cs_life.pdf Thanks for these links. > > Your syst:print? output looks ok to me. It would be interesting if you > compared your 5071A 1PPS against a GPS timing receiver for a week or month. > Then I could tell you better how well your 5071A is working. That looks like a good plan. I was going to just discipline the PPS against a timing receiver right off , but it would be interesting to see what its free running perf is like before I tweak that knob. > > /tvb > > _______________________________________________ > 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.
