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slow I mean that I am limited in my opinion by communication via scpi commands over USB. Because I output a signal of e.g. 1 kHz then wait 100 ms - that is the delay I have set, but it is probably not a problem (that is what I think now) because when I read with an oscilloscope the disturbing signal is still output and then the oscilloscope reading takes place and I calculate 20 log from the output signal amplitude to the input signal amplitude.

Unless I have something else wrong? In the pictures you can see the oscilloscope connected for the input signal and the second probe from the output signal

How to check it and where? The chip I have is TPS40210EVM

So how do I get rid of the noise? When I turn on the converter, I can see this kind of noise. I powered the converter with a 9V battery, and the output is 24V. And should the oscilloscope be set to the AC range for both channels? I measure the injected signal with one probe and the output signal with the other.

is it because of this noise and bad amplitude that they do not work properly?

And can it be calculated like this, that the value of the input amplitude to the output amplitude?