User`s guide

6 To Make Measurements RIGOL
DS2000 User’s Guide
6-7
4. Set the Vertical Scale
In FFT measurement, the unit of the horizontal axis changes from time to
frequency. Use HORIZONTAL
SCALE and HORIZONTAL POSITION
to set the scale and position of the horizontal axis respectively.
The unit of the vertical axis can be dB or Vrms which use logarithmic mode and
linear mode to display vertical amplitude respectively. If you need to display the
FFT frequency spectrum in a relatively larger dynamic range, dB is
recommended. Press Scale to select the desired unit and the default is Vrms.
Press
and and use to set the vertical position and amplitude of
the FFT frequency spectrum respectively.
Tips
Signals with DC components or deviation would cause error or deviation of the
FFT waveform components. To reduce the DC components, set the “Channel
Coupling” to “AC”.
To reduce the random noise and aliasing frequency components of repetitive or
single pulse, set the “Acquisition Mode” of the oscilloscope to “Average”.