RIGOL MSO/DS1000Z Series - Manual (Page 122)

RIGOL Chapter 6 MATH and Measurement
6-8 MSO1000Z/DS1000Z User’s Guide
Table 6-1 Window Function
Window Characteristics
Waveforms Suitable for
Measurement
Rectangle The best frequency
resolution;
the poorest amplitude
resolution;
similar to the situation
when no window is
multiplied.
Transient or short pulse, the signal levels
before and after the multiplication are
basically the same;
Sine waveforms with the same amplitude
and rather similar frequencies;
Wide band random noise with waveform
spectrum changing relatively slower.
Blackman The best amplitude
resolution;
the poorest frequency
resolution
Single frequency signal, search for
higher order harmonics.
Hanning Better frequency
resolution and poorer
amplitude resolution
compared to
Rectangle window.
Sine, periodic and narrow band random
noise.
Hamming A little bit better
frequency resolution
than Hanning
Transient or short pulse, the signal levels
before and after the multiplication are
rather different.
Flattop Accurate
measurement of
signal.
Signal without accurate reference and
require to accurately measurement.
Triangle Better frequency
resolution.
Narrow band signal with stronger
interference noise.
8. Set the Display Mode
Press View to select "Half" (default) or "Full" display mode.
 Half: the source channel and the FFT operation results are displayed
separately. The time domain and frequency domain signals are displayed
clearly.
 Full: the source channel and the FFT operation results are displayed in the
same window to view the frequency spectrum more clearly and to perform
more precise measurement.
9. Set the Vertical Unit
The vertical unit can be selected as dB/dBm or Vrms. Press Unit to select the
desired unit and the default is dB/dBm. dB/dBm 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/dBm is
recommended.
10. Press Scale Reset to adjust the vertical scale of the operation results to the