Question

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this is a practical question where you are given a black box and you connect it on a breadboard to a power supply,oscilloscope and signal generator. I got stuck on how to take the measurements as im not sure what exact measurements to take to determine the bode amplitude plot.

thanks

do you know how to get the bode plot of a black box circuit. And what measurements to take using an oscilloscope and signal generator to get values for the dB and frequency scale

Answer 1

Hello,
          Please find the answer attached as under. Please give a thumbs up rating if you find the answer useful! Have a rocking day ahead!

Getting a bode plot of a black box is essentially doing system identification of the box. You need to first connect the input of the black box to a function generator, with a sine-sweep mode. With the sine sweep mode, you can select a range of frequencies to be input to the system. The output is connected to a digital oscilloscope. For each frequency input, note down the gain of the system (Vout/Vin). Then, convert this to a log scale (Take 20*log of the gain). After you have done this for all the frequencies so selected, plot these values versus the frequencies to get the Bode plot!

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