That estimate is probably about right. It hasn't been quite that expensive for me but then I have a couple of Omegas; gave my Rolex to my nephew years ago. For your money, they remove the movement (or the calibre...or the ébauche et assortiments...depending on how horologically snooty you care to be.

Recall, that the estimated frequency is f = eventcount / time and that an average over 100k samples will mainly average to higher resolution mainly in the time numbers and to a smaller amount in the event-count number. Voltage-biases is due to difference in the trigger voltage of the start and stop comparators on the input.

This U.S. beam has been used to make a similar measurement, but the GPS timing equipment that was used (Truetime XL-AK, Model 600-101-015) resulted in an estimated uncertainty of about 70 ns in the neutrino time-of-flight, too large to test the recently reported effect. I am one of a group of physicists working with the neutrino beam in the U.S.

Bringing out the C field in my estimation does not effect long or short term. External magnetic field I think is a joke. An other option is a loop that generates a tuning word for the DDS but that means your steps are 7 E-13. Bert Kehren In a message dated 1/12/2012 10:34:10 A.M.

A lower limit to the phase noise floor of an opamp can be estimated from its output noise and the output signal level. Half of the output noise power contributes to PM, the other half to AM. At low offsets modulation of internal capacitances by power supply noise and opamp noise modulates the phase shift produced by the opamp.

When received, I opened the package and found that the entire container apparently had received what was estimated to be a 15 or 20 foot drop onto concrete (probably off of a conveyor belt on to the floor) driving the front panel knobs of the unit entirely through the inside aluminum, the plywood and the exterior aluminum of the shipping container.

If the CPU clock is unstable and wanders around with time, temperature, power and fan activity it then becomes necessary - as the timing 1PPS PLLs built into many modern kernels do - to try to measure its frequency error and drift and estimate the error phase between it and true time.

I didnt grasp the "real numbers", so I tried estimating the local drift, i.e. the drift value every 2k samples.

The time interval is an estimation. Someday I will use a microphone connected to a storage oscilloscope to figure out what the difference is. Regards. Max. K 4 O DS.

Well, RMS calculation can be a poor or good estimator for 1 sigma deviation depending on the noise and systematics. If the dominant noise is white and systematics is low, it will be relatively good. We tend to use Allan deviation in replace of standard deviation for frequency stability when we have non-white noise. > 2.