FFT - sum of amplitudes

[frohr]

Hi,
I have 30k samples and I make FFT.
Size of amplitudes in FFT is ok.
But I want make sum of all amplitudes and here I can see wrong number. For example here:

1 2 3 4 5 6 7 8 9 10 11 12

SAMPLES = 30000 T = 1 / 30000   x = np.linspace(0.0, SAMPLES*T, SAMPLES, endpoint=False) y = v_data  # v_data are from csv file, attached yf = fft(y) xf = fftfreq(SAMPLES, T)[:SAMPLES//2] self.canvas.axes.cla() self.canvas.axes.set_ylabel("Amplitude in g RMS") self.canvas.axes.set_xlabel("Frequency in Hz") self.canvas.axes.plot(xf, 2.0/SAMPLES * np.abs(yf[0:SAMPLES//2])) print(sum(2.0/SAMPLES * np.abs(yf[0:SAMPLES//2])))

FFT picture:
https://ibb.co/Z1tgjBs

FFT seems OK.
If I use

1	print(sum(2.0/SAMPLES * np.abs(yf[0:SAMPLES//2])))

I can see number 14.39 and it is nonsense. I need to see something about 1.
What I do wrong? How to correctly sum all amplitudes from FFT?


Data file excel:
https://file.io/YBMdA8plul3N

Any idea?
Thanks.