Hi, since I'm using the MV89A timebase of my counter for all measurements, this should provide a possibility to also evaluate the stability of that timebase, shouldn't it?
When I measure a GPSDO, while it is locked the long term stability will be as good as the GPS clock. Therefore, all drift I'm seeing in the measurements will be from the counter timebase. Now, TimeLab tells me the drift is around 3E-5 Hz per hour. Pulling up the well-known datasheet for the MV89A, depending on the OCXO class the aging is between +/- 3e-8 and +/- 5e-9 per year. Since no unit is given on the data sheet I'm assuming it is relative accuracy, right? The datasheet doesn't give daily aging figures but states that the typical correspondence between yearly and daily is a factor of 1e-2. Therefore, is the following calculation correct: 5e-9 / year => 5e-11 / day => around 2e-12 / hour, relative accuracy 2e-12 / hour * 10 MHz = 2e-5 Hz / hour If that's correct, my timebase would be still in spec, not best in class but quite OK, at least as far as aging is concerned. BR, Matthias _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
