How should the input and output filters of an electrical force measurement switch (PMS) be coordinated?

As a system, the filtering design of a PMS's input (power/signal input) and output (power/signal output) ports needs to be coordinated to avoid performance degradation caused by filtering dead zones or impedance mismatch. The coordination principle is: input filtering focuses on protecting against interference from the external power grid and environment, while output filtering prevents internal noise from being radiated or conducted outwards through the output cables. At the power port, input filtering uses a large-value common-mode inductor CMZ1211-501T (500μH) in conjunction with a Y capacitor, primarily suppressing common-mode conduction in the 150kHz-30MHz range; output filtering (e.g., for powering a load) can use a smaller-value CMZ2012A-900T (90μH) or PBZ ferrite beads, focusing on suppressing high-frequency noise. For communication ports (e.g., RS485), the input (receiver) needs to be equipped with an ESD protection device ESDSM712 and a common-mode inductor CML3225A-510T; the output (transmitter) should also have the same configuration to ensure bidirectional protection. In terms of layout, the input and output filtering circuits should be located close to their respective connectors, isolated by shielded compartments or ground planes. Through collaborative design, the PMS system can perform stably in the full range of immunity tests in the IEC 61000-4 series, while its own emissions meet the EN 55032 standard.