SIGLENT SDS1000D Manual de usuario descargar pdf (Pagina 40)

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

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

Set dBVrms to

be the vertical

Scale unit

Time

base

Sampling

rate

FFT

window

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SIGLENT SDS1000D Manual de usuario Pagina 40