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RIGOL Chapter 6 MATH and Measurement
6-8 DS1000Z User 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. Select FFT Mode
Press Mode to set the data source of the FFT operation to "Trace" or
"Memory*".
Trace
― The data source of the FFT operation is the data of the waveform
displayed on the screen; the length is up to 1200 points.
― The FFT sample rate is the screen sample rate (namely 100/horizontal
time base).
Memory*
― The data source of the FFT operation is the data of the waveform in the
memory; the length is up to 16384 points. When the memory depth
doesn’t exceed 16384 points, all of the data is used for FFT operation.
Otherwise, the instrument will read data of 16384 points according to
the trigger position; the read rule is as follows:
If the trigger position is before the start point of the memory, the
instrument will read the data of 16384 points from the start point
of the memory.
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