6 Measurements and Math Functions
238 InfiniiVision Oscilloscopes User’s Guide
FFT Operation
1 Press the [Math] key, press the Function softkey and select f(t), press the Operator
softkey and select FFT.
• Source 1 — selects the source for the FFT. (See page 225 for information about
using g(t) as the source.)
• Preset — sets the frequency Span and Center to values that will cause the entire
available spectrum to be displayed. The maximum available frequency is half the
effective FFT sample rate, which is a function of the time per division setting. The
current FFT sample rate is displayed above the softkeys.
• More FFT — displays the More FFT Settings Menu.
2 Press the More FFT softkey to display additional FFT settings.
• Window — selects a window to apply to your FFT input signal:
• Hanning — window for making accurate frequency measurements or for
resolving two frequencies that are close together.
• Flat Top — window for making accurate amplitude measurements of frequency
peaks.
Source
select
Preset Span
and Center
frequencies
Vertical and
Window FFT
controls
Sample
rate
Displayed
function
selected
FFT Scale FFT Offset Return to
previous menu
Window
Center
frequency
Frequency
Span
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