Urgent help needed (fft with crio 9074 scan mode)

[shashank123]

Hi Alll I am trying to do a fft analysis of a signal acquired from analog input card ni 9205.I have the kit crio 9074 and i am using it in scan mode. The main problem is that when i connect the fft block with the waveform graph , the graph shows no lines though when i export the value in excel , it has some value, the back window and front window of my vi(running) is attached.Even the indicator shows the value of the signal but i am not able to see anytihng in the graphs. Please someone help urgently i need to get it done for my project work

[Dennis_Knutson]

Why would you expect to see a graph or determine a power spectrum from a single scalar value. You can simply change the point style of the graph to view but the data is still garbage for an FFT.

Your urgently need to get a better understanding of the requirements for an fft (i.e. multiple samples with dt information).