tds2012_oscilloscope_guide.doc
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You can choose an FFT window to eliminate discontinuities that will disrupt your output. As
shown in Table 3, there are three window choices.
Table 3
FFT window options
Problems occur when the oscilloscope acquires a time-domain waveform containing frequency
components that are greater than the Nyquist frequency. The frequency components that are
above the Nyquist frequency are undersampled, appearing as lower frequency components that
“fold back” around the Nyquist frequency. These incorrect components are called aliases. An
example of aliasing is shown below:
Dr. Montoya
Rev. 3/16/09
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