RIGOL DS1000D User Manual
Page 41
RIGOL
© 2008 RIGOL Technologies, Inc.
User’s Guide for DS1000E, DS1000D Series
2-11
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 Table 2- 6 The FFT menu
Menu
Settings
Comments
Operate
A+B
A-B
A x B
FFT
Add source A to source B
Subtract source B from source A
Multiply source B by source A
Fast Fourier Transform
Source
CH1
CH2
Define CH1 or CH2 as FFT source
Window
Rectangle
Hanning
Hamming
Blackman
Select window for FFT
Display
Split
Full screen
Display FFT waveform on half screen
Display FFT waveform on full screen
Scale
Vrms
dBVrms
Set “Vrms ” as vertical unit
Set “dBVrms ” as vertical unit