Display FFT of input signal which receive from VISA read ?

[ajapyy]

Hi.

I receive data from MCU whcih sampling frequency is constant and we assumed it is S. now I get data from MCU with using VISA read block. I can display data, perform some functios like filtering, multiply and save them in txt files. all thing is OK.

but when I want to see FFT of incomig data on chart , it doesn't work !! I use this VI for calculate and display FFT of input signal (from VISA read) and display it which in Y-Axis is magnitude and X-Axis is frequency. 

in your mind why this is not work and what I must done for show input signal FFT and frequency components ?

Thanks.

[HeroOfHyrule]

If I understood this correctly, you are getting the correct results when outputting to a text file but you are not able to see the results when trying to output to a chart?

This discussion may be of some help to you.