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Keysight InfiniiVision 1200 X-Series and EDUX1052A/G Oscilloscopes
User's Guide
5 FFT Spectral Analysis
FFT is used to compute the fast Fourier transform of analog input signals. FFT
takes the digitized time record of the specified source and transforms it to the
frequency domain. When the FFT function is selected, the FFT spectrum is plotted
on the oscilloscope display as magnitude in dBV versus frequency. The readout for
the horizontal axis changes from time to frequency (Hertz) and the vertical readout
changes from volts to dB.
Use the FFT function to find crosstalk problems, to find distortion problems in
analog waveforms caused by amplifier non-linearity, or for adjusting analog filters.
To display a FFT waveform:
1
Press the
[FFT]
key.
•
Source 1
— selects the source for the FFT.
•
Settings
— displays the FFT Settings menu.
•
Span
— specifies the frequency range represented by the
width of the display. Divide span by 10 to calculate the
frequency scale per division.
•
Center
— specifies the frequency at the center vertical grid
line of the display.
