Today I have been trying to drive a 5370B directly from a TADD-2, with little luck (other HP freq counters seem to work OK). I was about to ask about it on this list, but noticed this thread.
I guess this could explain why I am getting erroneous, random readings? Dave On Sat, Feb 27, 2010 at 4:01 PM, Bruce Griffiths <bruce.griffi...@xtra.co.nz > wrote: > The attached excerpts from the 5370A and 5370B manuals indicate that for > best performance, that the common practice of driving the 5370A/B 1x inputs > directly from a 5V CMOS logic signal is a bad idea. > > For the 5370A attenuating the 5V CMOS signal to a 1V swing with the > threshold set to 0.5V is close to optimum. > An input signal with limits of 0V and +1.4V with a trigger threshold of > 0.7V is the maximum usable (for high performance). > An input signal with limits of 0V and +0.3V with a trigger threshold of > 0.15V is the minimum usable (for high performance). > > For the 5370A attenuating the 5V CMOS signal to a 2V swing with the > threshold set to 1V is close to optimum. > An input signal with limits of 0V and +3.5V with a trigger threshold of > 0.7V is the maximum usable (for high performance). > An input signal with limits of 0V and +0.3V with a trigger threshold of > 0.15V is the minimum usable (for high performance). > > Bruce > > > _______________________________________________ > 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. > _______________________________________________ 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.