How to suppress interference from long cables in an electrical force measurement switch (PMS)?

Long cables (typically >10m) connecting a PMS to a remote sensor or actuator act like antennas, easily receiving and radiating electromagnetic interference. Suppression measures must address both the transmitting and receiving ends. First, select cables with good shielding performance, such as double-shielded cables; the inner shield is for signal return, and the outer shield is grounded to shield against external interference. Second, install effective filtering and protection circuits at the PMS port, such as common-mode inductors CML3225A-510T and TVS diodes. For analog signals, use 4-20mA current loop transmission, which has far superior anti-interference capabilities compared to voltage signals. For digital signals, use differential transmission (such as RS485) and ensure impedance matching. When laying cables, keep them away from high-voltage cables (parallel spacing >30cm) or run them through metal conduits. In particularly harsh environments, consider using signal isolators or fiber optic converters to completely eliminate conducted interference. Additionally, ferrite cores can be added at intervals (e.g., every 5 meters) along the cable to increase high-frequency loss. Through comprehensive suppression, long-cable transmission systems can operate stably in industrial environments, with bit error rates or errors controlled within acceptable ranges.