As to the frequency measurement based on 1 period timing; I think you'll find that what's actually measured is the period, whose reciprocal is displayed as frequency.
This means that the channel A trigger point set the start & the channel B trigger point set the stop of the period measurement. A very small mismatch of those 2 points will result in an apparently large error in the computed frequency. As was pointed out earlier, this technique also doubles the trigger uncertainty of the measurement vs. the more traditional single channel method. Pete Rawson _______________________________________________ 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.