I am looking for source of few EM noise I am measuring. Following FFT graphs are average of 20 scans using 1048576 points.
There is some noise at 50Hz, which is from power grid in EU (220v, 50Hz) and it got much better when I purchased better power cord, so the FFT graph is now much clearer with overall lower noise floor. This is LineIn of a PC soundcard
Interesting is noise at 80Hz and 240-250Hz. I really dont know about any device working on so low frequencies. Any idea?
There is some noise at 50Hz, which is from power grid in EU (220v, 50Hz) and it got much better when I purchased better power cord, so the FFT graph is now much clearer with overall lower noise floor. This is LineIn of a PC soundcard
Interesting is noise at 80Hz and 240-250Hz. I really dont know about any device working on so low frequencies. Any idea?