SIGLENT SDS1000CML+, User Manual, Page: 34 / 159

SIGLENT
24
SDS/SD User Manual
3. Press “Source” button to select “CH1” or “CH2” according to input signal
channel.
4. According to Nyquist law, turn the “S/div” knob to adjust the sampling rate
(This parameter is displayed behind the time base parameter) is at least
double than input signal frequency.
2. Displaying the FFT Spectrum
Press the MATH button to display the Math Menu. Use the options to select the
Source channel, Window algorithm, and FFT Zoom factor. You can display only
one FFT spectrum at a time. You can select “Full screen” or “Split” in “Display”
option to display FFT waveform on full screen or display channel waveform and its
FFT waveform on half screen at a time.
Picture2.6-10 FFT function
3. Select FFT window
Windows reduce spectral leakage in the FFT spectrum. The FFT assumes that
the YT waveform repeats forever. With an integral number of cycles, the YT
waveform starts and ends at the me amplitude and there are no discontinuities in
the signal shape A non-integral number of cycles in the YT waveform causes the
signal start and end points to be at different amplitudes. The transitions between
the start and end points cause discontinuities in the signal that introduce
high-frequency transients.
According to the tested options and source speciality, make sure the window
you need to use.