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Figure 2-14 The FFT menu
The FFT menu table
Menu
Setting
Description
Enable
ON
OFF
Turn on FFT
Turn off FFT
Operate
FFT
Fast Fourier Transform
Source
CH1
CH2
Define CH1 or CH2 as FFT source
Window
Rectangle
Hanning
Hamming
Blackman
Select window for FFT
1/2
Go to the next menu page
2/2
Back to the previous menu page
Scale
Vrms
dBVrms
Set “Vrms” as vertical unit
Set “dBVrms” as vertical unit
Display
Full
Split
Display waveform in full screen
Display waveform in split screen
2/2
Back to the previous menu page
Note:
1. Signals that have a DC component or offset can cause incorrect FFT waveform
component magnitude values. To minimize the DC component, choose AC Coupling
on the source signal.
2. To reduce random noise and aliases components in repetitive or single-shot events,
set the oscilloscope acquisition mode to average.
3. To display FFT waveforms with a large dynamic range, use the “dBVrms” scale. The
“dBVrms” scale displays component magnitudes using a log scale.
FFT Window
The scope meter provides four FFT windows. Each window is a trade-off between
frequency resolution and amplitude accuracy. It depends on the desired
