Hi You can be quite sure it's no worse than 2x10^-12. It is pretty common to scale by square root of two based on a "they could be equal" assumption.
Bob On Jul 14, 2011, at 8:32 PM, Mark Spencer <mspencer12...@yahoo.ca> wrote: > > > I'm curious in knowing if there are any rules of thumb as to how much better > a > reference oscillator needs to be than the device under test when measuring > ADEV > ? > > To provide a bit of context to my question I'm using a HP 5370B to repeatedly > measure the time interval between the 10 Mhz signals from a FTS 1050 and > rubidium oscillator. > > > Having compared the FTS 1050 to another OCXO in the past I'm confident that > it > is meeting or exceeding it's spec of an ADEV of 1X10-12 or better at tau's of > say 100 thru 1000 seconds. I'm also confident that at tau's of 100 seconds > or > more the noise introduced by the 5370B is less than 1x10-12. > > The underlying question that I have is how much confidence could I put in > measurements that show the rubidium of having an ADEV of say less than > 2.0X10-12 > at a tau of 100 sec ? > > > This is just for a hobby (: and I'm not looking for any degree of certainty > but > I'm curious in understanding how accurate the measurements might be and if > changes in the measurements might not be caused by changes in the device > under > test. > > Thanks in advance for any replies. > > Regards > Mark Spencer > > > _______________________________________________ > 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.