How to rectify a power line carrier PLC conducted transmission failure?

To rectify conducted emissions failures in power line carrier PLCs, it's necessary to locate the noise source and strengthen filtering. Use a spectrum analyzer combined with a current probe to pinpoint the noise source at the excessive frequency, such as the switching power supply or clock circuit. For the excessive frequency, add a common-mode inductor CML4532A-510T or a ferrite core at the power input. Adjust the X capacitor value, for example, increasing it from 0.1μF to 0.47μF. Check the grounding system to ensure low impedance. After rectification, retest; conducted emissions should be at least 6dB below the limit. Common rectification measures also include adding shielding and optimizing PCB layout. Systematic rectification can ensure the product passes the conducted emissions test, avoiding time-consuming delays.