[time-nuts] three cornered comparison tools

Magnus Danielson magnus at rubidium.dyndns.org
Wed May 1 18:10:49 EDT 2013

On 05/01/2013 10:09 PM, Ed Palmer wrote:
> I recently made some measurements between 3 oscillators. It wasn't a
> true 'Three-Cornered Hat' measurement because the measurements were made
> sequentially. When I do the three-cornered hat calculation for the
> hopefully 'better' oscillator, I end up trying to take the square root
> of a negative number. Is that a red flag that the data is invalid? If I
> ignore the minus sign, the results seem reasonable and I can
> successfully calculate from the result for each oscillator back to the
> measured results.

Doing sequential measurements could give you that result. sqrt(abs()) 
isn't the ideal, but understandable.

I've asked our favourite tool maker to include three-cornered hat, but 
he has not done it so far. Look forward to take it on a test-spin.


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