User Manual

6 To Make Measurements RIGOL
DS4000 User’s Guide
6-5
FFT
FFT is used to quickly perform Fourier transform on specified signals and transform
time domain signals to frequency domain signals. FFT operation can facilitate the
following works:
 Measure harmonic components and distortion in the system
 Measure the characteristics of the noise in DC power
 Analyze vibration
Press MATH  Operate to select “FFT” and set the parameters of FFT operation.
1. Select Source
Press Source to select the desired channel. The channels available are CH1,
CH2, CH3 and CH4.
2. Select Window Function
Spectral leakage can be considerably decreased when a window function is used.
DS4000 provides four kinds of FFT window functions which have different
Vertical Amplitude Horizontal Scale FFT Sample Rate Center Frequency*
Frequency Domain Waveform Time Domain Waveform