Does the BMS control board exhibit sampling data deviation during the 50Hz, 100A/m magnetic field immunity test?

The 50Hz/100A/m power frequency magnetic field test primarily assesses the BMS's immunity to strong magnetic fields. Deviations in sampling data are typically caused by magnetic field induction affecting the Hall sensor, sampling resistor network, or ADC reference ground. Countermeasures include selecting sensors that are insensitive to magnetic fields or are shielded, and keeping them away from magnetic field sources. Differential sampling should be employed, and the sampling loop area should be minimized as much as possible, for example, by using twisted-pair cables or tight wiring. High-permeability materials such as permalloy should be used for local magnetic shielding of the sampling circuit. A low-pass filter should be added at the ADC input to suppress power frequency induced noise. By reducing the loop area and implementing physical shielding, power frequency magnetic field interference can be effectively addressed, ensuring sampling accuracy.