); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi fellow time-nuts!
I have been looking at the CNT-90 throughout the heatup of my BVA and one is on frequency and one on the Allan measure. I chose tau of 100 s for the measurements. The nice thing about the CNT-90 is that it has a plot of values which updates with each measurement so you can put it on long accumulations and walk by and have a look at the trend. Frequency wise, the BVA started 200 Hz high and then dived down and then overshot and slowly retarded back. This is still in progression, but the drift slowly becomes less as expected. As I adjusted it to 5 MHz after a short period of heatup, I am now up to 118 mHz up from that after almost 2 weeks. The interesting thing is that the Allan deviation has gone from 13,0 uHz to 11,9 uHz in that period. I seriously doubt that the noise processes shifted that much for the tau in question, but it shows how the CNT-90 Allan processing does not compensate for drift. It should be noted that there is still considerable drift, so the Allan deviation isn't meaningfull until the drift have decayed out. 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.
