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Measure Every Peak Value Sine Wave

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Hi 

 

I have a sine wave that has an average peak to peak value of 1.2V. The sine wave has a dc offset of around 2.5V. Each cycle in the sine wave varies in width. 

 

I can feed the signal into the express vi to tell me the maximum Positive pulse peak value and minimum negative peak value. 

 

Unfortunatly i would like to measure the Maximum and Minimum Positive Pulse Peak value and Maximum and Minimum negative peak values. 

Im a little bit lost on how to do this. 

 

the frequency of the signal is around 10-20 hz. 

 

If i could get the Postivie peak value for every cycle and negative peak value of every cycles stored in two seperate 1d Array i could then search the 1d array for maximum and minimum. Problem is i am unsure how to find each indiviaul peak value. 

 

i have attached my code. I am using at 9229 to monitor the signal. I am sampling at 10000 samples per second and recording about 2 seconds of data.

 

Thanks 


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