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To use the Math FFT mode, you need to perform the following steps:
1. Set up the source (time-domain) waveform.
2. Press the AUTO button to display an YT waveform.
3. Turn the vertical “POSITION” knob to move the YT waveform to
the center vertically (zero divisions).
4. Turn the horizontal “POSITION” knob to position the part of the
YT waveform that you want to analyze in the center eight
divisions of the screen. The oscilloscope calculates the FFT
spectrum using the center 1024 points of the time-domain
waveform.
5. Turn the “Volts/div” knob to ensure that the entire waveform
remains on the screen.
6. Turn the “S/div” knob to provide the resolution you want in the
FFT spectrum.
7. If possible, set the oscilloscope to display many signal cycles.
To display FFT correctly, follow these steps:
1. Push the “MATH” button.
2. Set the “Operation” option to FFT.
3. Press the “Source” button to select “CH1” or “CH2” according to
input signal channel.
4. Turn the “Time/div” knob to adjust the sampling rate (this
parameter is displayed behind the time base parameter), making
sure it is at least double the input signal frequency. (to avoid
aliasing according to Nyquist’s theorem)
Displaying the FFT Spectrum
Press the MATH button to display the Math Menu. Use the options to
select the Source channel, Window algorithm, and FFT Zoom factor. You
can display only one FFT spectrum at a time. You can select “Full screen”
or “Split” in “Display” option to display FFT waveform on full screen or
display channel waveform and its FFT waveform on half screen at a time.
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