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V5.1‐March2010
USINGFFT(FASTFOURIERTRANSFORM)(MS420ONLY)
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). These frequencies can then be
matched with known system frequencies, such as system clocks, oscillators, or
power supplies.
The FFT in this oscilloscope can transform 2048 points of a time-domain signal into
its frequency components with the final frequency containing 1024 points ranging
from 0Hz to the 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 (details below)
Format
dB
Vrms
Set Vrms as the vertical scale unit of measure
Set dBVrms as the vertical scale unit of measure
