User’s Manual of
OWON
Colour Digital Storage Oscilloscope
31
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
Setting
Instruction
FFT
ON
OFF
Turn on FFT function
Turn off FFT function
Source
CH1
CH2
Select CH1 as FFT source
Select CH2 as FFT source
Window
Rectangle
Blackman
Hanning
Hamming
Select window for FFT.
Format
dB
Vrms
Select dB for Format
Select Vrms for Format
Zoom
*1
*2
*5
*10
Set multiple *1
Set multiple *2
Set multiple *5
Set multiple *10
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.
