User Guide

RIGOL
DS6000 User’s Guide
6-6
2. Select Window Function
Spectrum leakage can be considerably decreased when a window function is
used. DS6000 provides four kinds of FFT window functions with different
characteristics and are applicable to measure different waveforms. You need to
select the window function according to different waveforms and characteristics.
Press Window to select the desired window function and the default is
“Rectangle”.
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
relatively slowly changing waveform
spectrum.
Hanning
Better frequency
resolution
poorer 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.
3. Set the Display Mode
Press Display to select “Split” (default) or “Full Screen” display mode.
Split: the source channel and the FFT operation results are displayed separately.
The time domain and frequency domain signals are straightforward.