Hi, For the Y-axis, it depends of the input data binaries. I mean,
if these come from a voltage signal or a collection of data or a sound
signal, etc. It's necessary to know the factor conversion the voltage
values, for example...
And for the X-axis, that represents the axis of frequencies, and its
posible to reconstruct until the nyquist order of the harmonic
frequency (FS/2).Also it's important, the lenght of the input
data, it's a power of 2, since algorithm FFT gives a fast and optimal
result.
Then connect the output to a "Waveform Graph" Display, on the front
panel.
I hope this help.
Bye..