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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