How to quickly rectify excessive conducted/radiated emissions from a PAC (Power Actuator) smart controller?

For rapid rectification of excessive conducted or radiated noise in a PAC (Power Amplifier Control Unit), it is necessary to locate the noise source and path. Conducted noise (150kHz-30MHz) is usually caused by power supply noise; rectification methods include increasing the common-mode inductor (CMZ7060A-701T) and adjusting the filter capacitor.

Radiated noise (30MHz-1GHz) is usually caused by high-speed signals or gap leakage; rectification methods include adding shielding, improving cable shielding, and addressing gap overlaps. Use near-field probes to locate hotspots and implement targeted rectification; for example, add shielding to the clock chip and a ferrite core to the cable entry point. After rectification, retest until the noise level is below the limit by 6dB. Rapid rectification can be completed within 1-2 days, allowing the PAC to pass pre-testing.