FFT
FFT converts a time-domain (YT) signal into its frequency components
(spectrum). The oscilloscope can optionally display the source waveform at the
same time as the FFT waveform. Use FFT for the following types of analysis:
Analyze harmonics in power lines
Measure harmonic content and distortion in systems
Characterize noise in DC power supplies
Test impul
se response of filters and systems
Analyze vibration
To use FFT, you need to perform the following tasks:
Set up the source (time-domain) waveform
Display the FFT spectrum
Select a type of FFT window
Adjust
the sample rate to display the fundamental frequency a nd harmonics
without aliasing
Use cu
rsors to measure the spectrum
SettingUptheTime-DomainWaveform
Befo
re you use FFT, you need to set up the time-domain (YT) waveform. To do
so, follow these steps:
1. Pus
h Autoset to display a YT waveform.
2. Turn the Vertical Position knob to move the YT waveform to the center
ve
rtically (zero divisions).
This ensures that the FFT will show a true DC value.
3. 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 2048 points of
the time-domain waveform.
TBS1000B and TBS1000B-EDU Series Oscilloscopes User Manual 51
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