How can I determine how long it take the lab view circuit to execute once?

I'm working on a temperature control labview simulation that works with an external temperature device and I have my labview stimulation set up so that I can turn a external light on or off (which is in a chamber) and the temperature is measured inside that chamber and I displayed versus time in the labview x-y graph. I can internally turn the heat source (the light) on or off and see the waveform change. Now the information that is being displayed on the waveform is also being saved to a data file. And I noticed that as soon as I run the stimulation of the circuit on the first input into the labview while loop is from the data file. now the first execution of the simulation will start as soon as the data files sends an input into the while loop and the second execution of the labview loop will happen the next time the data file inputs something into the while loop of labview. Now, by using circuitry inside the while loop, how can I record the actual time of the initial input (into the while loop) along with the time of the second input into the loop so that I can determine how long it take for one execution in labview will take.

One thing to keep in mind about the Tick Count VI. It uses the ms clock from the CPU which rolls over back to zero after it reaches an upper limit. You might end up getting very large negative values if you subtract the current value from the last value.
Once every 39 (?) days that can happen but are you sure abou the large negative thing?
I seem to remember Rolf saying that the math takes care of itself. A quick experiment confirms that memory.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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