Thanks to everybody who helped out with this one... it's all working great, as far as I can tell. The new release of PN.EXE with the integration features is here:
http://www.speakeasy.net/~jmiles1/ke5fx/gpib/setup.exe In addition to all the noise-measurement stuff it did before, it now measures jitter (both time and phase), carrier/noise ratio, and residual FM. I'm pretty confident that the math is right... this is the trace I mentioned comparing to the HP app note: http://www.speakeasy.net/~jmiles1/pn.gif (Compare with figure 4 in http://www.speakeasy.net/~jmiles1/ke5fx/gpib/an270-2.pdf) The RMS phase jitter that they report is only about 8% less than what I see on a 24-year-old example of the same analyzer... or less than 1 dB in carrier/noise terms. The difference in residual FM is a bit worse than that, because my trace gets a bit noisier toward the high end of the 500-1000 Hz integration interval, while theirs got quieter. Still, these measurements line up to a very-satisfying degree. -- john, KE5FX _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts