What are the domestic and international EMC (electromagnetic compatibility) standards for ultrasound diagnostic instruments?

Ultrasonic diagnostic equipment must comply with GB 9706.1 and YY 0505 (domestic) and IEC 60601-1-2 (international) EMC standards. Ultrasonic equipment contains a high-voltage pulse generator, a multi-channel low-noise receiver amplifier, and a high-speed digital processing unit, making it a potential source of interference and inherently sensitive. The probe's high-voltage pulse transmission circuit is a strong source of interference; therefore, a TVS diode (e.g., SMBJ series) should be used near the probe interface in its drive circuit to clamp the reflected voltage. The sensitive analog front-end power supply requires high-frequency noise isolation using a ferrite bead (e.g., PBZ1608A-102Z0T). The equipment's abundant external interfaces (e.g., USB, HDMI, RJ45) are EMC weak points; low-capacitance ESD protection devices (e.g., ESDULC5V0D9B) should be used to discharge static electricity while ensuring video signal integrity.