Rigol MSO4000 User Manual page 133

6 To Make Measurements
Note: In FFT mode and when MATH is the active channel, you can also press
HORIZONTAL
4. Set the Vertical Scale
In the FFT measurement, the unit of the horizontal axis changes from time to
frequency. Use HORIZONTAL
to set the scale and position of the horizontal axis respectively.
The unit of the vertical axis can be dB or Vrms. dB and Vrms 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
the FFT frequency spectrum respectively.
5. Antialiasing
Press Anti-Aliasing to enable or disable the antialiasing function. When
enabled, horizontal scale, FTT sample rate and center frequency are doubled.
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
To reduce the random noise and aliasing frequency components of

repetitive or single pulse, set the
to "Average".
MSO4000D/S4000 User's Guide
SCALE to switch between "Split" and "Full Screen".
and use to set the vertical position and amplitude of
Coupling" to "AC".
SCALE and HORIZONTAL
"Acquisition
POSITION
Mode" of the oscilloscope
RIGOL
6-7