专业音响 - c-mark 噪音与接地问题（Professional audio - c-mark noise and grounding problems）.docVIP

专业音响 - c-mark 噪音与接地问题（Professional audio - c-mark noise and grounding problems） Noise and grounding problems Land and electricity (signals), this is a pair of inseparable twins. Grounding is usually the connection of a conductor to the earth. The ground in electronic technology may not be related to the earth, but it is only a equipotential surface in the circuit. As in a radio or television set, it is only a potential point in the receiver line. Grounding, in power and electronic technology, is simple, complex, and essential. According to the role of grounding, can be divided into work grounding, protective grounding, over-voltage protection, grounding, anti-static grounding, shielding, grounding, signal and so on. In broadcast and television technology, several grounding types will be encountered. This paper expounds some problems of grounding technology in combination with practice. Protective earthing Protective earthing is a kind of protective device which is used to prevent the damage of the insulation and cause the equipment to be electrified and endanger personal safety. It has 02 ways of grounding and connecting. According to the power requirement, where the use of three-phase four wire power supply system with neutral grounding, so it should be zero, and the metal shell equipment to zero line through a conductor, and does not allow the direct grounding equipment shell. In the substation in the broadcasting system of the switchgear, particularly common central air conditioners, transmitter power switch equipment and large power equipment. In planning and design, the grounding bus shall be drawn out from the ground grid to all the equipment, and then the casing of the machine will be connected to the grounding bus by conductor. It is worth pointing out: the grounding wire should be connected to the grounding terminal of special equipment, the other end of the best use of welding. Sometimes, the outer shell of the equipment will be numb, which is caused by a