Digital oscilloscopes in combination with near-field probe sets are powerful instruments for debugging during design. They allow designers to quickly locate and analyze EMI problems early on. High dynamic range and a high input sensitivity of 1 mV/div ensure that even weak emissions can be analyzed. The R&S®RTO fast Fourier transformation (FFT) implementation provides a fast update rate and the FFT frame overlay processing and persistence display provides insights into the structure of unwanted emissions.