John wrote:
It seems to me that it's just a case of expecting too much from a counter.
Possibly, but a well-tuned 5370B can get to the low e-12's at 1-10 seconds. It has better one-shot resolution than the Pendulum, but not by a factor of 10. So, I'd have thought the Pendulum would at least get to the mid e-11's if the time base was up to it.
To get the best performance from a counter, you need to set up the trigger thresholds well away from ground as Charles says. Also consider taking TI readings rather than frequency readings. Frequency readings are OK for initial setup and basic ADEV comparisons but they won't generally yield the best ADEV fidelity or the lowest possible measurement floor.
Yes, using TI mode is essential for getting down to the counter's limits. Was Karen using frequency mode? I wasn't paying attention to that end of things.
Best regards, Charles _______________________________________________ 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.
