Hello aac.
Just built my baxandall circuit and wanted to test the frequency reaponse with the fancy oscilloscope that they got in the workshop, but have absolutely no idea how to work this thing.
So far I selected "fft" and chose a range of 20khz. But I can't find any way to sweep through the frequencies with its internal generator.
I also tried hooking up a function generator, using its sweep function and connecting the trigger output to the osci, but nothing seems to work.

Any idea? Maybe there is a way to do this without these fancy instruments?

 

Yes, there is a way to do this without fancy equipment.

Manually sweep the frequency from 20Hz to 20kHz, with a sine wave function generator. Examine the ratio of the signal amplitudes (output/input) on an oscilloscope. You may have to do this over several range settings.

If the input voltage stays the same over the entire range, you can simple gauge the output amplitude to give you an idea of the frequency response. You don't need accurate numerical ratios (or dB attenuation).