Fast Fourier Transforms
3–28
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
Normal Waveform of an
Impulse Response
FFT Waveform of the
Magnitude Response
FFT Waveform of the
Phase Response
Figure 3–15: System Response to an Impulse
Operation
To obtain an FFT of your waveform:
1. Connect the waveform to the desired channel input and select that channel.
2. Adjust the vertical and horizontal scales and trigger the display (or press
AUTOSET).
The topic Offset, Position, and Scale, on page 3–34, provides information
about optimizing your setup for FFT displays.
3. Press MORE to access the menu for turning on math waveforms.
4. Select a math waveform. Your choices are Math1, Math2, and
Math3
(main).
5. If the selected math waveform is not FFT, press Change Math Definition
(side)
➞ FFT (main). See Figure 3–16.
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