You could build a simple one shot using something like a 555 timer IC Or take a input pin from your PiC and use the RTC to drive a routine which changes state of the pin for the duration of test
Content by Scott Typos by Siri > On Nov 15, 2016, at 1:57 PM, Chuck / Judy Burch <ciandjabu...@gmail.com> > wrote: > > > I'm building a laboratory scintillation counter that uses my HP 5335a counter > as a read-out. The FREQ mode gives only approximate results (maximum gate > time is about 5 seconds). The TOT mode counts pulses for an arbitrary time > that can be set using the "external arm input" on the rear panel. So I need > a timing pulse (of either polarity) of known and adjustable width (time). > One way to do this is with a PIC frequency divider taking the counter 10MHz > output down to 1 PPS following that with two or three ripple counters to get > a 1 - 5 - 10 - 50 ... sequence. That I understand. > > How do I get a pulse to start with a push button and then stop for example > 500 or 10,000 seconds later? > > > _______________________________________________ > 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.
