There are very fast pulsers, some in NIM, that use a charged coax line and Hg relay to calibrate Pulse Height analyzers. The line length sets the pulse length; the charging voltage, the pulse height.
-John ================ > Years ago I had a cousin who ran a civilian calibration lab. For > calibrating > scopes, etc, for rise time he used a mercury wetted relay which he claimed > had nearly instant rise time and no bounce. Seems that he used a resistive > divider and the mercury relay shunted a portion of the divider. With very > small inductances and capacitance to slow things down it would seem to be > very fast. > > Al, k9si, retired > > > >> The target is 4ns, while ideas seemed to be clear at some point, now I'm >> having doubts if better to use a MOSFET or a bipolar transistor >> as the switch element. Experiments with MOSFETs presented me some >> difficulties charging the gate capacitance having some trouble to >> achieve something in the 4ns region. Well 4ns seems hard whatever device >> anyway. >> >> I would be happy to receive some comments/ideas that may pop out of your >> heads. >> Thanks. >> > > _______________________________________________ > 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.
