[time-nuts] Allan variance Vs Plain Old Accuracy
SAIDJACK at aol.com
SAIDJACK at aol.com
Thu Feb 14 15:23:10 EST 2008
Hello Martyn,
>Rubidium's oscillators usually stay within 1E-10 accuracy, about five times
>better than any OXCO unit I've measured.
yes, your data shows this. This is actually also reflected in your ADEV
measurements, your data shows that at 100s and 500s the Rb has about 10x better
ADEV performance than the OCXO, and looking at your 3600s plot the OCXO
wanders around in about that time frame, so there is some correlation here.
So the ADEV numbers are not all that unrelated to frequency accuracy :)
Please see Toms' ADEV measurements for four GPSDO's that he posted a couple
of days ago, the ADEV numbers for those units are a bit, to significantly
better than your ADEV measurement numbers, I think the reason is that the units
he tested very likely all had DOCXO's.
More information about the time-nuts
mailing list