Stop time measurement

[KowdTek]

Hello, I have a vi that measures speed in rpm. How can I add stop time measurement in it.

I want it to start counting when the speed is below to a desired rpm and stop at zero.

Thanks in advance!!!

[Brian_R]

I would just use the Tick Count (ms).vi.  Call tick count when you want to begin counting and call tick count once again when you want to stop counting.  Subtract the first value from the second value to find the elapsed time in milliseconds.  Then convert to whatever units you want.