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

[UdeChile]

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 ) and a picture of my labview code.  

Cheers and have a nice day!

[crossrulz]

You might have what we like to call a race condition.  The problem is that you have no clue when that first Tick Count is taken.  It could be from before any of the setup or right before your loop starts or anywhere in between.  Trust the hardware timing to give you what you need.

[UdeChile]

Thanks crossrulz, but how can i view my hardware frecuency? is a VI put in the block diagram or something? i use Instacal, and its supposed that labview reads instacal measures with Ulx library, that example (evidence1.png) was with a DEMO-BOARD configure in instacal (like a waveform generate but in Instacal not labview) ,i try with the device usb connect and its the same (analog input).

My device is USB-1208LS (MCC DAQ).

Thanks for all!