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User's Manual of OWON Colour Digital Storage Oscilloscope
Using FFT function
An FFT breaks down signals into component frequencies, which the oscilloscope uses
to display a graph of the frequency domain of a signal, as opposed to the oscilloscope's
standard time domain graph. You can match these frequencies with known system
frequencies, such as system clocks, oscillators, or power supplies.
FFT in this oscilloscope can transform 2048 points of the time-domain signal into its
frequency components and the final frequency contains 1024 points ranging from 0Hz to
Nyquist frequency .
The following table describes the FFT menu:
Function Menu
FFT
Source
Window
Format
Zoom
Taking the FFT operation for example, the operation steps are as follows:
1. Press the MATH MENU button and call out the WAVE MATH menu.
2. Press the F4 selection button to choose FFT.
3. Press F1 to turn on/off FFT after entering FFT menu, and please note that FFT is
prohibited in Window setting mode. The green waveform F is shown in the screen
after calculation.
Setting
Instruction
ON
Turn on FFT function
OFF
Turn off FFT function
CH1
Select CH1 as FFT source
CH2
Select CH2 as FFT source
Rectangle
Blackman
Select window for FFT.
Hanning
Hamming
dB
Select dB for Format
Vrms
Select Vrms for Format
*1
Set multiple *1
*2
Set multiple *2
*5
Set multiple *5
*10
Set multiple *10
31
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