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Math FFT
TDS1000/2000-Series Digital Oscilloscope User Manual
123
Nyquist frequency
(one-half sample rate)
Frequency
Amplitude
Aliased frequencies Actual frequencies
Eliminating Aliases
To eliminate aliases, try the following remedies:
H Turn the SEC/DIV knob to set t he sample rate t o a faster setting.
Since you increase the Nyquist frequency as you increase the
sample rate, the aliased frequency components should appear at
their proper frequency. If too many frequency components are
shown on the screen, you can use the FFT Zoom option to
magnify the FFT spectrum.