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storing waveform samples

Hello fellow engineers,
I have an interesting programming problem and I would be delighted if all of you could help me.  I have a CRio controller that returns signal waveforms of various paramters. I have to

1. collect W samples of each waveform.
2. I have to collect these W samples once every Y minutes. (assume sampling rate of 1000 samples /second)
3. Calculate the average of the W samples for each waveform.
4. Store the calculated averages as a tdms file.
I have been able to collect W samples for each waveform, find the averange and store it. But, I am not able to find a way of doing this once every Y minutes. When I use a timed loop or any structure for that matter, the extraction of the waveforms over W samples doesn't seem to work.
I await useful insights and valuable suggestions,

Thanking you all,

Aparna.
Student,
Germany.
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Hello, I have attached a very simple example for measuring time in LV. Maybe this can give you an idea. Regards Ruediger
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