On 12/04/2010 06:51 PM, [email protected] wrote:
Dear list members - being a proud owner of a LRPO-101 as well as a HP 105B and a TRACOR 527E Frequency Difference meter, I decided to compare these two oscillators with each other after some days of running them. The attached plot (if this won't work, you can find it here online: http://fafner.dyndns.org/~ulmann/30_nov_2010_tracor_small.jpg) shows the output of the TRACOR 527E (frequency difference, sensitivity set to 10**11 - this corresponds to a multiplication factor of 10**4 regarding the frequency difference) plotted with an old thermal plotter - this is just a qualitative plot but the amplitude difference between the minimum and maximum peaks corresponds to about +/- 1 parts in 10^-11. I would like to hear your opinion about this - does this look reasonable to you? The inputs to the TRACOR were the 10 MHz output of the LPRO and the 1 MHz output of the HP 105B - both oscillators were running for a little bit more than three days without interruption. All the best - Bernd. :-)
I notice that there is a repeated pattern (beyond the fact that the paper-trace has been scanned in overlapped fashion, which anyone viewing it should be aware of...) which I suspect is the due to the daily variations. Do notice how it has "quite" and "noisy" periods. In addition, there are similarities between these variations, possibly from the repeating pattern which the sun presents...
Time-marks in the data would help further analysis. So would the digital representation of values. It's booring cause I kind of like these old strips of papers, but it becomes a bit hard to use modern processing aids... which is possible since storage and processing power is now dirt cheap.
Cheers, Magnus _______________________________________________ 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.
