[time-nuts] precision timing pulse
paulswedb at gmail.com
Tue Nov 15 21:40:19 EST 2016
I'll add my 10 cents here. Because the accumulation time can be very long
555 class timers become a serious issue due to the large R&Cs involved.
I will guess some accuracy is desired.
As Chris says a start button to an arduino. The difference I might suggest
is a GPS 1sec PP into the arduino for counting. Then through a serial port
you could input what ever accumulation time you might like. Using a 64 bit
integer thats a lot of seconds that are quite accurately timed and
semi-traceable to real time for events.
Curious what you are counting?
On Tue, Nov 15, 2016 at 7:47 PM, Scott Stobbe <scott.j.stobbe at gmail.com>
> If you are trying to avoid writing code, the 74hc5555 might be worth taking
> a look at.
> On Tue, Nov 15, 2016 at 3:00 PM Chuck / Judy Burch <ciandjaburch at gmail.com
> > 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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