DSA Front Panel save output data

[Giustife76]

Hi all,

I'm using the 4464 PXI card to analyse some waveforms and I see that the output file in TDMS format contains only the waveform in time domain, while the FFT plot is not saved. How can I save also the FFT? I do not see at first glance any option to add this to the TDMS file. 

Thanks

Federico

[dsb@NI]

If you are running the executable, there is not a configuration option to include the spectra data.

If you are using the sample project that ships with the Sound and Vibration Toolkit, you can modify this VI:

Unbundle spectra and info and create inputs into:

Add spectra support in the "Save Data" case using this subVI:

The above would save the averaged spectra into the TDMS file.

Another option would be to post process a recorded waveform. With the SV API, that could look something like this:

This post processing could also be implemented with the frequency analysis VIs included with LabVIEW (Full), but you would have additional work to implement overlap processing or extended spectrum measurements such as power in band or peak search.

[dsb@NI]

"If you are running the executable, there is not a configuration option to include the spectra data in the TDMS file."

---

In my last post, I assumed you wanted the spectral data for additional processing. The FFT graph does support multiple options for export:

So, if you just want to view the spectrum in an image or work with it in Excel, you can do that through the Export options. If you also happen to use LabVIEW, you can Copy Data from the spectrum graph and paste it into the Sound and Vibration XControl (Spectrum with Cursors) where you can perform cursor-based measurements.