Rigol DS1000E Series User Manual page 41

1. Using the FFT
FFT (Fast Fourier Transform) transforms time domain signals to frequency domain
signals. The horizontal axis shows the frequency and the vertical axis shows the
amplitude dBVrms or Vrms. FFT function can not only to help you find crossfire
problem and analog waveform distortion caused by nonlinear amplifier, but also can
adjust the analog filter.
FFT waveforms are useful in the following applications:
Measuring harmonic content and distortion in systems

Characterizing noise in DC power supplies

Analyzing vibration

Press MATH→Operate→FFT, to display FFT menu.
Figure 2- 17
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Table 2- 6 The FFT menu
Menu
Settings
A+B
A-B
Operate
A x B
FFT
CH1
Source
CH2
Rectangle
Hanning
Window
Hamming
Blackman
Split
Display
Full screen
Vrms
Scale
dBVrms
User's Guide for DS1000E, DS1000D Series
Comments
Add source A to source B
Subtract source B from source A
Multiply source B by source A
Fast Fourier Transform
Define CH1 or CH2 as FFT source
Select window for FFT
Display FFT waveform on half screen
Display FFT waveform on full screen
Set "Vrms " as vertical unit
Set "dBVrms " as vertical unit
RIGOL
2-11