Chapter 6 Operations and Measurements RIGOL
MSO4000/DS4000 User’s Guide 6-7
Table 6-1 Window Functions
Window Characteristics
Waveforms Suitable for
Measurement
Rectangle
The best frequency
resolution.
The poorest amplitude
resolution.
Similar to the situation
when no window is
applied.
Transient or short pulse, the signal
levels before and after the
multiplication are basically the same.
Sine waveforms with the same
amplitudes and rather similar
frequencies.
Wide band random noise with relatively
slowly changing waveform spectrum.
Hanning
Better frequency
resolution.
Poor amplitude
resolution.
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.
Blackman
The best amplitude
resolution.
The poorest frequency
resolution.
Single frequency signal, search for
higher order harmonics.
6. Specify the display mode
Press Display to select “Split” (default) or “Full Screen” display mode.
Split: the source channel waveform and the FFT operation waveform are
displayed separately. The time domain and frequency domain signals are
displayed clearly.
Full Screen: the source channel waveform and the FFT operation results are
displayed in the same window (full screen) to view the frequency spectrum
more clearly and to perform more precise measurement.
Note: In FFT mode and when MATH is the active channel, you can also press
HORIZONTAL
SCALE to quickly switch between “Split” and “Full Screen”.
7. Specify the vertical scale unit
Press Scale to select “dB” (default) or “Vrms”.
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