mean of waveform

[Philipp Kravanja]

Hi,

I am using LabVIEW 6.1 and I want to form the mean and standard deviation of a waveform i acquire using the acquire waveforms.vi  (settings: scan rate 10 and number of samples 10  ==> 1 sec for 1array consisting of 10  Datapoints).
I would like to acquire for 10 seconds or something like this and then form the mean and standard deviation of the 10*10 datapoints. I am get  using waveform component.vi, std deviation and variance.vi. To create an array of 100 points i used the insert into array.vi with shiftregisters. The very first time i run the vi it does what it should but after stopping the acquisition and starting it again the data old data is still in my array and i form the mean of 200 points and so on. How can i make  sure there is no old data in the array when i stop running the vi and start a new acquisition ?
Thanks for any help

Philipp

[devchander]

Probably you are not initializing the shift register with an empty array, at the beginning of the Loop

Wire an 'empty array' constant to the initialization point of shift register ( form outside the loop, at the beginning of the loop)

Regards,

Dev

[devchander]

look at attached pic

[Philipp Kravanja]

Thanks a lot. It works !