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- Press Export, and the save setting menu is displayed. You can export the
peak search results to the internal memory or the external USB storage
device in CSV format. For detailed saving operation, refer to descriptions in
"
Store and Load
".
• Press More > Window to select the desired window function.
Spectral leakage can be considerably decreased when a window function is used.
This series of oscilloscope provides 6 FFT window functions (as shown in
Table
9.1 Window Function
) which have different characteristics and are applicable to
measure different waveforms. You need to select the window function according
to the characteristics of the waveform to be measured.
Table 9.1 Window Function
Window
Function
Characteristics
Waveforms Applicable to the Window
Function
Rectangular
Best frequency
resolution
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
slow change of waveform spectrum.
Blackman-
Harris
Best amplitude
resolution
Poorest frequency
resolution
Single frequency signal, searching for higher
order harmonics
Hanning
Better frequency
resolution and poorer
amplitude resolution
compared with
Rectangular
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
Operations and Measurements
146
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