Hi The fact that the plots are still going down (as 1/tau) past the 1.0x10^-13 point at 1,000 seconds is also a pretty good indication that it's not really ADEV of an OCXO.
The 100 ps rated single shot accuracy of the counter would give you 1.0 x10^-10 at 1 second and a 1/tau slope. Bob > On Nov 2, 2014, at 3:56 PM, Angus <not.ag...@btinternet.com> wrote: > > On Sun, 2 Nov 2014 12:13:34 +0300, you wrote: > > >> Mode has been switch from Frequency to TI - result is much better now. It >> was the main improvement in my measurement. Thanks a lot! >> Picture of ADEV OCXO result - >> https://dl.dropboxusercontent.com/u/21338179/hamradio/OCXO_Adev/OCXO%20ADEV%20TI%20mode%2020141102.jpg > > > Hi Karen, > > You appear just to be measuring the ADEV of your counter in single > shot TI mode here, not the oscillators - how exactly do you have the > counter and oscillators connected up? > > If I was doing it I'd probably try start by setting the counter to > measure freq in Smart Freq mode, and set it to ext ref, with one > morion feeding the external reference and another on the input. If the > morions are ok you should get towards 1E-11 at 1 sec (if I'm reading > the specs correctly) If not, try other oscillators and see if anything > changes. > > As John said, TI is more complex to do anyway, and with quartz that > has not had days or even weeks to settle it's a total pain. > > Angus > > > _______________________________________________ > 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.