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fft [2015/03/19 14:18] schultz |
fft [2015/03/19 14:34] (current) schultz |
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| - Notice how the spike at f=10 kHz gets more narrow as the time/division increases. | - Notice how the spike at f=10 kHz gets more narrow as the time/division increases. | ||
| - In summary, it takes a lot of periods of a signal to produce a good frequency domain representation. Therefore, the signal needs to be zoomed out to get a good frequency domain signal. | - In summary, it takes a lot of periods of a signal to produce a good frequency domain representation. Therefore, the signal needs to be zoomed out to get a good frequency domain signal. | ||
| - | - You can adjust the amplitude and position of the purple signal (this is the FFT signal) by using the knobs in the gray math box. The red box in the following picture shows how you change the amplitude of the FFT signal {{ :scope3.jpg?100 |}} and the following picture shows how to shift the signal up and down {{ :scope4.jpg?100 |}}. You can push the shifting button to put the FFT signal in the middle of the screen. | + | - You can adjust the amplitude and position of the purple signal (this is the FFT signal) by using the knobs in the gray math box. The red box in the following picture shows how you change the amplitude of the FFT signal {{ :scope3.jpg?100 |}} and the following picture shows how to shift the signal up and down. {{ :scope4.jpg?100 |}} You can push the shifting button to put the FFT signal in the middle of the screen. |
fft.1426796334.txt.gz ยท Last modified: 2015/03/19 14:18 by schultz
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