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precision_timing:multiple_time_interval_capture [2013/01/08 19:00] (current)
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 +====== Muyltiple Time Interval Capture ======
 +//To measure the stability of an oscillator, you normally run a Time Interval Counter between the Oscillator Under Test and a Reference Oscillator. What do you do when you do not have a Reference Oscillator that you know is better than the one you want to measure?//
 +//You use the "​three-corner-hat"​ method: you compare three oscillators 2 by 2 and you can then determine by computation which is the best one and evaluate the performance of the others compared to this one.//
 +//Here is a thread about what John Ackerman did to do that.//
 +If anybody'​s interested, I have a perl script (running under Linux, using the linux-gpib tools) that controls a 59307A and HP 5334A to do long-term logging of four PPS sources against each other.
 +It takes a 100 second average of each PPS source sequentially;​ I end up with six log files, each with a tau of 600 seconds: CS1-GPS, CS2-GPS, RB1-GPS, CS1-CS2, CS1-RB1, and CS2-RB1.
 +If anyone'​s interested, I'd be happy to make that program available, though it's not polished up for distribution.
 +The data files from this program are the basis for phase and adev plots at http://​www.febo.com/​plots/​ which are updated hourly. The software that generates those plots is called stable-stats and is available for download at http://​www.febo.com/​time-freq/​tools/​. (Unfortunately,​ at the moment the plots are out of date as we had a power failure last week and I don't have the clocks reset yet; that's a project for this weekend.)
precision_timing/multiple_time_interval_capture.txt ยท Last modified: 2013/01/08 19:00 (external edit)
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