[time-nuts] precision timing pulse
Chuck / Judy Burch
ciandjaburch at gmail.com
Tue Nov 15 13:57:10 EST 2016
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?
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