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2-18
Key points
The FFT resolution is the quotient of the sampling rate and the number of FFT points.
With a fixed number of FFT points, the lower the sampling rate the better the
resolution.
The Nyquist frequency is the highest frequency that any real-time digitizing
oscilloscope can acquire without aliasing. This frequency is half that of the sample
rate, provided it is within the analog bandwidth of the oscilloscope. Frequencies
above the Nyquist frequency will be under sampled, which causes aliasing.
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