What are the domestic and international EMC (electromagnetic compatibility) standards for electromyography (EMG) machines?

Electromyography (EMG) machines detect muscle electrical signals, and their EMC standards comply with GB 9706.1, YY 0505 (domestic), and IEC 60601-1-2 (international). Due to the unique frequency and amplitude range of EMG signals and the need for electrical stimulation, standards focus on limits for conducted and radiated emissions, as well as immunity to external radio frequency interference. The stimulator output circuit generates high-voltage pulses, which are strong sources of interference and require proper shielding and filtering. The input circuits of needle electrodes and surface electrodes must be protected against electrostatic discharge and suppress environmental noise. In the design, a high-voltage TVS (e.g., SMDJ series) can be used for voltage clamping at the stimulation output, and a low-noise, high-input-impedance amplifier with a protection network should be used at the signal input stage.