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[Help] Difference between Channel Length (.tdms save data) and samples calculated

Hi guys, im  in trouble with my VI DAQ, i have a huge difference between Length data (.tdms files) and my samples calculated in the same loop, i dont know if im doing something wrong in my code or if is it normal when u save data with DAQ, i appreciate any help or guide , I attached evidence (frecuency: 1000 Hz, total time: 7,366 s, but with f= 100 Hz for example is the same issue ) and a picture of my labview code.  

 

Cheers !

 

pd: i used to Instacal and the library Ulx for labview, and my DAQ is USB-1208LS (MCC), and i dont know how to use hardware timing.

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