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Basic Operation
1
Fundamental frequency component
Frequency component
4
3
2
5
1. Frequency at the center graticule line
2. Vertical scale in dB per division (0dB=1V
)
RMS
3. Horizontal scale in frequency per division
4. Sample rate in number of samples per second
5. FFT window type
5.3.1.3
Selecting FFT Window
Using windows can eliminate the spectral leakage in the FFT spectrum. The FFT algorithm
assumes that the YT waveform repeats all the time. When the number of cycles is integral (1, 2,
3 ...), the YT waveform starts and ends at the same amplitude and there are no discontinuities in
the signal shape.
If the number of cycles is nonintegral, the YT waveform starts and ends at different amplitudes and
transitions between the start and end points will cause discontinuities in the signal that introduces
high-frequency transients.
DSO1000E Series HandHeld Oscilloscope User Manual
22
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