I'm a bit of an RF noob -- I hope this is the right place to ask such a basic RF question.
I'd like to be able to characterize a low-pass filter (specifically, for suppressing EMI). I'd like to DIY a simple automated circuit to do this, rather than buy a piece of test equipment.
What are the typical approaches here?
The first thing which comes to mind is something which can generate a sine wave of a given frequency, run that through the filter, then have a peak detector on the other end and measure the amplitude. Do this for as many frequencies as you'd like (using an Arduino to drive it and collect the data), then plot the data as a "sweep" response.
Are there other approaches? I guess you could also try to throw wide-band white noise at the filter, and then use a spectrum analyzer to measure the output. But I haven't invested in a spectrum analyzer yet.
My goal here is to be able to perform very basic, low precision measurements of various filters. E.g. comparing RC filters, LC filters, ferrite beads, etc.
I'm guessing the approach will also be determined by how high of a frequency I want to sweep to. I'm not really sure what my requirements are there.
If you know of any good resources for a beginner, please feel free to post them!