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Basic Operation
DS O5000 Series Digital Storage Oscilloscope User Manual
21
Control the oscilloscope to magnify or attenuate the source signal of the channel waveform. The
vertical size of the display on the screen will change (increase or decrease) to the ground level.
Also you may use this knob to switch between coarse and fine.
4. MATH
MATH
MATH
MATH MENU
MENU
MENU
MENU :
:
:
: Display the waveform math operations. See the table below for details.
T he MATH menu contains source options for all math operations.
Operations
Operations
Operations
Operations Source
Source
Source
Source Options
Options
Options
Options Comments
Comments
Comments
Comments
＋ CH1+CH2 Add Cha nnel 1 to Channel 2 .
－
CH1-CH2
Subtract t he C hannel 2 waveform from the
C hannel 1 waveform .
CH2-CH1
S ubtract t he C hannel 1 waveform from the
C hannel 2 waveform .
FFT CH1 or CH2
Three types of window available for selection:
Hanning , Flattop , Rectangular .
Zoom: Use the FFT Zoom button to adjust the
window size.
Scale: x1 , x2 , x5 , x10.
Note:
Note:
Note:
Note: All
All
All
All selected
selected
selected
selected menus
menus
menus
menus are
are
are
are highlighted
highlighted
highlighted
highlighted in
in
in
in orange.
orange.
orange.
orange.
5.3.1
5.3.1
5.3.1
5.3.1 Math
Math
Math
Math FFT
FFT
FFT
FFT
This chapter elaborates how to use the Math FFT (Fast Fourier Transform).
You
can use the Math
FFT mode to convert a time-domain (YT) signal into its frequency components (spectrum) , and to
observe the following types of signals:
Analyze harmonics in power cord s ;
Measure harmonic content and distortion in systems ;
Characterize noise in DC power supplies ;
Test
impulse response of filters and systems ;
Analyze vibration .
To
use the Math FFT mode, perform the following tasks:
Set the source (time-domain) waveform;
Display the FFT spectrum;
Choose a type of FFT window;
Adjust the sample rate to display the fundamental frequency and harmonics without aliasing;
Use zoom controls to magnify the spectrum;
Use cursors to measure the spectrum.
5.3.1.1
5.3.1.1
5.3.1.1
5.3.1.1 Setting
Setting
Setting
Setting Time-domain
Time-domain
Time-domain
Time-domain Waveform
Waveform
Waveform
Waveform
It is necessary to set the time-domain (YT) waveform before using the FFT mode. Follow the steps
below.
1. Push the AUTOSET button to display a YT waveform.
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