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SDS5000X Series Digital Oscilloscope User Manual
161 / 236 W W W. S I G L E N T. C O M
ï‚Ÿ FFT sample rate (Sa): FFT operation results present the first Nyquist zone
(DC ~ Sa/2) of the frequency spectrum. Be aware that the FFT sample rate
may be inconsistent with the sample rate in the time domain.
 When the number of points in time domain, N, is less than 2 Mpts, the
FFT takes the number which is an integer power of 2 closest to N. In
this case, FFT sample rate = sample rate in time domain.
 When N is greater than 2 Mpts, FFT first decimates N by D, and then
takes the first 2 Mpts for the calculation. In this case, FFT sample rate
= sample rate in time domain/D.
For example, in the case of sample rate in time domain is 5 GSa/s and
number of samples is 5 Mpts, FFT first decimates the samples by 2, to
2.5 Mpts, and then take the first 2 Mpts to calculate the spectrum. In
this example, FFT sample rate = 5 GSa/s ÷ 2 = 2.5 GSa/s.
ï‚Ÿ FFT points (Curr): The current FFT points, which is an integer power of 2.
The SDS5000X supports up to 2M (2097152) points.
ï‚Ÿ Frequency interval (â–³f): The frequency interval between two adjacent
points in the FFT sequence, which is proportional to the frequency
resolution.
ï‚Ÿ Average count of FFT (Avg): Displayed only when the FFT mode is set to
"Average", indicating the completed average count.
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