User Guide

RIGOL Chapter 6 MATH and Measurement
6-6 MSO1000Z/DS1000Z User’s Guide
waveform corresponding to the horizontal center of the screen.
4. Horizontal Scale
Press Hz/Div and use to adjust the horizontal scale of the frequency
domain waveform.
5. Vertical Position
Press Offset and use to adjust the vertical position of the operation results.
6. Vertical Scale
Press Scale and use to adjust the vertical scale of the operation results.
7. Select Window Function
Spectral leakage can be considerably decreased when a window function is used.
MSO1000Z/DS1000Z provides six kinds of FFT window functions which have
different characteristics and are applicable to measure different waveforms. You
need to select the window function according to the waveform to be measured
and its 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
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
Signal without accurate reference and