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SDS2000X HD Series Digital Oscilloscope User Manual
1 9 2 i n t . s i g l e n t . c o m
rate in the time domain. Assuming the max points value 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 2 GSa/s and the number of
samples is 10 Mpts, the FFT first decimates the samples by 4, to 2.5 Mpts, and then takes
the first 2 Mpts to calculate the spectrum. In this example, FFT sample rate = 2GSa/s ÷ 4 =
500 MSa/s.
FFT points (Curr): The current FFT points, which is an integer power of 2. The SDS2000X HD
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.
Select Operation as FFT in the math dialog box and touch
Config to recall the configuration dialog box:
A. Set the maximum points (2
n
, n = 10 ~ 21)
B. Set the window type (Rectangle, Blackman, Hanning,
Hamming, and Flattop)
C. Automatically set the horizontal axis to fall span（0~f
s
/2）
D. Automatically set the center frequency to the maximum
frequency component in the previous frame
E. Select the display mode (Split, Full Screen, and
Exclusive)
F. Select the FFT mode (Normal, Average, and Max-Hold)
G. Set the average count in average mode
H. Reset average
I. Return to the previous menu
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