Operating Basics
Using Mathematics
Function Spectrum (FFT)
The spectrum fu
nction shows the spectral content of the input 1, 2, 3, or 4
waveform(s) in the input trace color. It performs an FFT (Fast Fourier Transform)
to transform the amplitude waveform from the time domain into the frequency
domain.
To reduc e the effect of side-lobes (leakage) it is recommended to use Auto
windowing. This will automatically adapt the part of the waveform that is
analyzed to a complete number of cycles.
Selecting Hanning, Hamming, or no windowing results in a faster update, but
also in more leakage.
Check that the entire waveform amplitude remains on the screen.
To use the FFT function, do the following:
1. Press the Acquire button.
2. Select A
CQUIRE OPTIONS.
3. Select Mathematics from the Waveform options.
42 THS3000 Series Oscilloscopes User Manual
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