The frequency accuracy is measured based on the EFC variation. I have recently received my TBolts, not yet fired up, actually preparing the power supply. Where is the DAC? I can't find... the LT1014 is not a DAC, the SO8 2105 is not an LT2105 nor an LTC2105. The DAC is 20bit as I can read in the manual and for a 10-volt range (-5..+5) the resolution is 9.54uV. I think I have to take great care in the power supply...
On Tue, Nov 22, 2011 at 11:00 PM, WarrenS <[email protected]>wrote: > To TBolt nuts > > A Tbolt that has been modified to use an external 10 MHz osc is all that > is needed to be able to measure freq and aging of an Rb osc to better than > 1e-14 using a week long test run. > Attached is a plot showing a recent 13 day long LPRO Rb test I did. > This modified LPRO showed an unbelievable average ageing rate of only > 2e-15/day over the first 12 days. > Of course anytime you get much below 1e-13 for a non Cs osc, it has some > luck evolved. > But still interesting that using ONLY a Tbolt and LadyHeather one is able > to measure freq that accurately. > (Can do even better using Dual Tbolts. Used to cancel the shorter term GPS > phase noise) > > ws > > OT > I know this is pretty boring stuff compared to all the neutrino speed and > Lightsquared OT subjects, > but I'll include it anyway because this is after all a Time and Freq > forum, or at least it use to be, and a few have asked me how to use a TBolt > to test their Rb. > > > _______________________________________________ > 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. > _______________________________________________ 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.
