Rigol 2000 Series User Manual page 149

Chapter 6 MATH and Measurements
Note: In FFT mode and when MATH is the active channel, you can also press
HORIZONTAL
4. Set Horizontal Position and Horizontal Scale
The horizontal axis of the FFT operation results represents frequency and its unit
is Hz. Use HORIZONTAL
set the horizontal position and horizontal scale of the FFT frequency domain
waveform respectively.
Note:
Setting the horizontal position can changing the center frequency of the
FFT operation results indirectly.
5. Set the Vertical Unit
Press Scale to set the vertical unit to dB or Vrms and the default is dB. 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.
6. Set Vertical Position and Vertical Scale
Press and
the FFT frequency domain waveform respectively.
7. Anti-Aliasing
Press Scale to enable or disable the anti-aliasing function.
8. Label
Press Label to define a label for the operation results. For the details, please
refer to "MATH Label".
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".
MSO2000A/DS2000A User Guide
SCALE to switch between "Split" and "Full Screen".
POSITION and HORIZONTAL
and use to set the vertical offset and vertical scale of
RIGOL
SCALE to
6-7