Hal, Now that you're mastered sampling every cycle, it's a good time to check how much of the noise or instability you see is due to the h/w and s/w you're using vs. how much is due to the power line itself.
Do you have a hp 3325 or similar synthesizer handy? Instead of using 60 Hz from the power line, feed in a known stable or accurate 60 Hz pulse source into the DCD pin and then see how your plots look in comparison. It's an easy experiment to do. The results will tell you how good/bad your PC-based time interval counter really is. Note it doesn't have to be 60 Hz; anything between say 10 and 100 Hz should work fine. By using a known stable and artificial input signal all glitches and instability you see in the plots are due to the sum total of h/w and s/w you're using. In effect the PC is measuring its own noise without knowing it. /tvb _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
