Reference
5. Select a signal
source. You can do an FFT on any channel or any stored
reference waveform.
6. Select the a pp
ropriate vertical scale and FFT window.
7. Use zoom controls and the cursors to magnify and measure the FFT waveform.
FFT Windows. Applying a window function to the source waveform record
changes the waveform so that the start and stop values are close to each other,
reducing FFT waveform discontinuities. This results in an FFT waveform that
more accurately represents the source signal frequency components.
The shape of the FFT window determines how well the window resolves
frequency or magnitude information.
TDS3000C Series Oscilloscope User Manual 75
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