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4.Advanced User Guidebook
84
The FFT menu:
Function Menu
Setting
Description
Source
CH1
CH2
Select the FFT source.
Window
Hamming
Rectangle
Blackman
Hanning
Kaiser
Bartlett
Select window for FFT.
Format
V RMS
Decibels
Radian
Degrees
V RMS and Decibels are amplitude
units; Radian, Degrees are phase units.
Display
Hori (Hz)
Position value
Time base
value/
Switch to select the horizontal position
or time base of the FFT waveform, click
or to adjust it.
Vertical
Position value
Division value/
Switch to select the vertical position or
voltage division of the FFT waveform,
click or to adjust it.
FFT Peak
ON
OFF
Enable or disable FFT peak search.
Dynamic marker ▽ marks the FFT
peak.
The FFT (fast Fourier transform) math function mathematically converts a
time-domain waveform into its frequency components. It is very useful for
analyzing the input signal on Oscilloscope. You can match these frequencies
with known system frequencies, such as system clocks, oscillators, or power
supplies.
FFT function in this oscilloscope transforms 8192 data points of the
time-domain signal into its frequency components mathematically (the record
length should be 10K or above). The final frequency contains 4096 points
ranging from 0Hz to Nyquist frequency.
Taking the FFT operation for example, the operation steps are as follows:
1. Click to call up the menu panel. Click the FFT softkey on panel to
switch to the ON state and display the FFT menu on the bottom. The pink
M waveform appears on the screen.
2. In the bottom menu, select Source. In the right menu, select CH1.
3. In the bottom menu, select Window. In the right menu, select the proper
window type.
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