Sqrt(adev_meas^2-adev_ref^2) should do it, but you are close to the floor so confidence bounds will have to be small for meaningfull values.
Cheers, Magnus Martyn Smith <[email protected]> skrev: Hello, I'm trying to measure the Allan Deviation of an amplifier and need help with the maths. My measurement process uses the SR620 in time interval mode and I make one measurement per second for about a day. I then use Ulrichs excellent plotter to calculate the Allan Deviation. The Allan Dev floor noise of the SR620 (without my amplifier) is as follows. 9.91E-13 (1 second) 1.59 E-13 (10 sec) 3.00 E-14 (100 sec) I then add my amplifier into the measurement process. I get the following Allan Dev results 1.09E-12 (1 sec) 2.48E-13 (10 sec) 4.32E-14 (100 sec). So the 1 sec Allan dev with my amp included, has gone up by 9.9E-14 for the 1 sec measurement. How to I calculate the actual Allan Dev of my amp for the 1 sec period? Best Regards Martyn _______________________________________________ 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.
