医疗电子设备接地是否良好，对于设备使用能否正常至关重要。良好的接地既保证了设备免受内、外界干扰，又可防止设备因绝缘不良使外壳带电引起触电事故。设备一般采用金属外壳（网状或罩）。因金属外壳静电屏蔽作用，设备内部不受外电场影响，外壳如接地后，机壳表面电场消失? Whether or not the medical electronic equipment is well grounded is crucial to the normal use of the equipment. A good grounding not only ensures that the equipment is free from internal and external interference, but also prevents the device from being charged due to poor insulation. Equipment generally uses a metal shell (net or hood). Due to the electrostatic shielding effect of the metal enclosure, the inside of the device is not affected by the external electric field. After the enclosure is grounded, the electric field on the surface of the enclosure disappears.