What are the domestic and international EMC (electromagnetic compatibility) standards for electrocardiographs?

Since electrocardiographs (ECG) are directly connected to the human body, their EMC safety is of paramount importance. Domestic standards include GB 9706.1 and YY 0505, while international standards include IEC 60601-1-2, with particular attention paid to immunity to radio frequency (RF) fields (e.g., mobile phones). The ECG front-end amplifier circuit is extremely sensitive to microvolt-level ECG signals and is susceptible to common-mode interference. Standard tests include power frequency magnetic field immunity and electrostatic discharge (ESD). To meet requirements, a high-frequency filter circuit should be designed at the lead input, using dedicated ESD/EMI integrated protection devices (e.g., ESDSVLC05-4) to provide ESD protection while filtering out RF noise. The device's switching power supply section must use SMBJ series TVS diodes to suppress transients and ferrite beads to isolate digital noise from entering the analog circuitry.