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SDS6000A Series Digital Oscilloscope User Manual
2 3 6 int.siglent.com
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. Assuming the
max points is set to 2 Mpts:
When the number of points in the 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 the 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 the time domain is 5 GSa/s
and the number of samples is 5 Mpts, the FFT first decimates the
samples by 2, to 2.5 Mpts, and then takes the first 2 Mpts to calculate
the spectrum. In this example, FFT sample rate = 5 GSa/s ÷ 2 = 2.5
GSa/s.
FFT points (Curr): The current FFT points, which is an integer power of 2.
The SDS6000A supports up to 8 M points (8388608, to be exact).
Frequency interval (△f): The frequency interval between two adjacent
points in the FFT sequence, which is proportional to the frequency
resolution.
Average count of FFT (Avg): Displayed only when the FFT mode is set to
"Average", indicating the completed average count.
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