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 the sample rate to a faster setting.
Since you increase the Nyquist freque ncy as you increase the
sample rate, t he aliased frequency components should appear at
their proper frequency. If too m any frequency components are
shown on the screen, you can use the FFT Zoom option to
magnify the FFT spectrum.
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