How to control EMC consistency in mass production of electrical force measurement switches (PMS)?

During PMS mass production, slight differences in component batches and manufacturing processes can lead to inconsistencies in EMC performance between products. Controlling consistency requires management across design, materials, and production. In design, select EMC components with high tolerance and stable temperature characteristics, such as the CMZ series common-mode inductors and varistors, avoiding the use of components with performance margins. Establish a strict "Key Component List," clearly defining the model, brand, and allowable range of key parameters for EMC-related components (such as filter capacitors, ferrite beads, and TVS). In production, establish "EMC Key Process Control Points," such as the soldering direction of filter inductors, the installation pressure of the shielding layer, and the torque of grounding screws, and monitor and conduct spot checks on the production line. Perform EMC key tests (such as conducted emission scanning) on samples from each batch or periodically, and establish Statistical Process Control (SPC) charts. Furthermore, audit suppliers to ensure that the EMC parameters of the components they provide are consistent. Through end-to-end control, the EMC performance fluctuation of mass-produced PMS can be controlled within ±3dB, ensuring 100% product pass of factory EMC spot checks.