SDS5000X Series Digital Oscilloscope User Manual
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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 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
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 SDS5000X supports up to 2 M points (2097152, 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.
Summary of Contents for SDS2000X Plus
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