I made a VI to plot spectrum of the .tdms file of voltage data acquired through NI 9225. Data obtained from tdms read block got successfully shown in the waveform graph. But when i tried to take its FFT or any other spectrum, it is showing error code-20315 (The waveform dt parameter is <=0). I observed using probe wires that value of dt parameter in the data coming from tdms read block is 0. Please suggest me how can i rectify this error or increase the value of dt parameter. VI and .tdms data file are attached here.
Your problem could be in your recording. Do you have an example of how you are logging to the TDMS file and possibly an example TDMS file?
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As crossrulz suggested this could be an issue related to your recording. How did you log the data?
If what you want is to edit the waveform and set a different time interval (dt) you could use the Build Waveform VI. But you have to be aware that this will change the original waveform.
