User Manual of PDS Series Oscilloscope
27
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
F1
once to turn on FFT, Press again to turn it off. Be aware that only to use FFT
when Horizontal Menu is set for main Timebase Not on Window setting mode. Again,
the green waveform is displayed as a result of FFT.
2.
Press
F2
to switch the FFT between CH1 and CH2.
3.
Press
F3
to choose WINDOW for FFT, there are four options here, including
Rectangle
、
Hamming
、
Hanning and Blackman. We will give details of these options
later.
4.
Press
F4
to switch between dB and Vrms.
