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DPO6000, MPO6000 Series Digital Fluorescent Oscilloscope Product Manual V1.3
65
◆ Represents noise characteristics in DC power supply
◆ Analysis of vibration
Steps:
1. Press the Math button on the front panel to open the Math function menu. Turn the
multi-function knob V0 to select “FFT” for fast Fourier transform operation.
2. Press the [Data Source] soft key and turn the multi-function knob V0 to select a data
source. 4 analog channels can be used as data sources. The resulting math waveform
is displayed on the screen and labeled "M".
3. Operation waveform settings:
[Center]: Set the frequency of the frequency domain waveform corresponding to the
horizontal center of the screen.
[Span]: Set the horizontal scale of the FFT waveform.
[Reference level]: Set the reference level of the FFT waveform.
[Scale]: Set the unit volt value in the vertical direction.
[Vertical Unit]: Select the unit of the vertical axis. The units of the vertical axis can use
the logarithmic scale to display the vertical amplitude in dB or the linear scale to display
the vertical amplitude in Vrms.
[Window]: Select the appropriate window.
When window functions are used, spectral leakage can be greatly reduced. This series
of oscilloscopes provide FFT window functions with 6 different characteristics, which
are suitable for measuring different waveforms. Users can select window functions
based on different waveforms and their characteristics.
Window
Measurement
Characteristics
Rectangular
Transient or short pulse wave-
form
Dedicated window for discrete window
similar to the situation when no window
is multiplied
Hanning
Period waveform
Better frequency resolution
Poorer amplitude resolution
Hamming
Transient or short pulse wave-
form
A little bit better frequency resolution
than Hanning.
Blackman
Single frequency signal, search
for higher order harmonics
The best amplitude resolution;
the poorest frequency resolution
Bartlett
(Triangle)
Stronger narrow band signal
Better frequency resolution
Flattop
Period waveform
Better amplitude resolution
Poorer frequency resolution
[Show-Only]: Set whether to display only the FFT calculation result and not the data
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