How does the abscissa change from time domain to frequence domain when running a FFT?

I'm working on a program about broadband ultrasonic attenuation(BUA) and met a problem with X-scale of the waveform after FFT. I used 'FFT Spectrum (Mag-Phase)' vi, but the order of magnitude of X-scale seems not resonable compared with reference. I decided to use 'Real FFT' vi instead and calculate X-scale by myself, but don't know how to change the X-scale form time domain to frequence domian while FFT. Thanks!

The VI 'FFT Spectrum (Mag-Phase).vi' will do the conversion for you correctly (following the formula given by Oleg), but only if you are providing the correct information about your sample rate, through the dt value (dt = 1 / Fsampling). If you only input your data array to the VI, it will "assume" you are sampling at 1 Hz, that is dt = 1.0 and your df will not be what you expect. So make sure you are using a Waveform Data Type, not a simple array. Use the Build Waveform primitive (located in your Waveform palette) to build a waveform with the correct dt value.

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How does the abscissa change from time domain to frequence domain when running a FFT?

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