Hi There, this is quite a good correlation I would say. I am surprised that they use an external temp sensor, not internal to the OCXO. 4.5us drift over 24 hours is pretty good though. bye, Said In a message dated 3/12/2009 12:07:43 Pacific Daylight Time, [email protected] writes:
Here is a clean plot of a Thunderbolt in holdover mode. The graph is 1 hour per major division. You can clearly see the dependence of the DAC voltage on temperature. You can also see that the unit holds the PPS signal within 150 nS for the first eight hours then it starts going wild. Not shown on the plot is that after 11 hours the PPS signal was off by 1 uS and at 24 hours it was off by 4.5 uS. The PPS error from 8 to 24 hours was a fairly straight line at 200-250 nS/hour _______________________________________________ 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.
