This circuit enables the Counter Module to be used as an accurate digital
timer. The circuit waveforms are shown in the green panels.
The time signal to be measured is applied
to the Start / Stop input. The AND gate combines this signal
with the clock signal from an oscillator circuit. The resulting
output is a burst of clock pulses with a duration equal to the
length of the time signal.
If the oscillator is running at 1KHz, the
counter display will show the length of the time pulse in milliseconds.