Hi Which *still* carefully avoids the issue of how .....
Bob On Feb 27, 2010, at 8:52 PM, Bruce Griffiths wrote: > Oops! a small correction (2nd paragraph): > > 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 5370B 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). > > Thus using the PPS output (~270 ohm is series with a 5V 74AC04 output) from a > Synergy evaluation board that uses an M12M or M12+ GPS timing receiver to > drive the inputs (with a 0-750mV signal) of a 5370A or 5370B is well within > the recommended input signal range for high performance. > This avoids having to adding an external 5V 50 ohm driver that some would use. > > Bruce > > Bob Camp wrote: >> Hi >> >> So exactly how did you know that I bought a (cheap) 5370B a few hours ago on >> the e-place and was just about to ask about how best to use it. >> >> Hmmmm....... >> >> Bob >> >> >> On Feb 27, 2010, at 7:01 PM, Bruce Griffiths 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 >>> >>> <5370ATriggering.png><5370BTriggering.png>_______________________________________________ >>> 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. >>> >> >> _______________________________________________ >> 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. >> >> > > > > _______________________________________________ > 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. > _______________________________________________ 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.
