They are relevant when a high input impedance buffer is used making it easier to add series/shunt overload protection. Protecting against 400 volts and higher is feasible this way.
Adding overload protection to a 50 ohm input is an interesting challenge but it can be done. Precede the 50 ohm termination if used with a current driven diode bridge. The current then determines the maximum input voltage which can be passed to the 50 ohm termination and following circuits. Check out the design of the Tektronix 7A29 vertical amplifier and 485 oscilloscope for examples were this was done. <http://w140.com/tekwiki/images/2/20/7a29_input_amp_schem.png> On Tue, 11 Apr 2017 08:22:14 -0400, you wrote: >I have a really naive question: how can picoamp leakage parts be relevant in >low impedance input pulse conditioning to an interval counter? > >Tim N3QE _______________________________________________ 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.
