Tom Van Baak pisze:
Hi Filip,
See attached. Let me know how your results differ from this.
It looks like 1.75 hours of frequency data of a 250 MHz DUT.
You first convert your raw frequency measurement data into
normalized frequency error data (i.e., subtract and divide by
f0 = ~250 009 770 Hz).
You can run the y- form (frequency) of an adev calculation
directly, or integrate the frequency error series into a time
error series and run the x- form (phase) of adev calculation.
I can explain more if you wish.
JohnM and UlrichB can double check this plot with their tools.
Thank you all for your charts. I forgot to substract and divide by
center frequency ;-)
That data represents a beat note between two optical frequencies: Nd:YAG
laser stabilized to hyperfine transitions of molecular iodine and
optical frequency comb that is phase locked to the SRS FS-725 rubidium
standard. And it seems that AVAR of this measurement is lower than
values for FS-725; AVAR for Nd:YAG laser can be found here:
http://www.innolight.de/pdf/laser_accessories.pdf .
Does anybody know what is the floor level of AVAR just by counting
frequency (for example using 53132 & Stable32 or SRS620)?
Filip.
_______________________________________________
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.
