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180
9.2 FFT Measurement
FFT is used to calculate the Fast Fourier Transform using the analog input channel. FFT record specifies the
digitization time of the source and converts it to the frequency domain. After selecting the FFT function, FFT
spectrum is plotted as amplitude in V-Hz or dB-Hz on the oscilloscope display screen. The reading of the horizontal
axis changes from time to frequency (Hz), while the unit of the vertical axis changes from volt to V or dB.
Figure 9-3 FFT Window
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