Problemes amb el soroll mesurador i terra
Terra i electricitat (senyal) són bessons inseparables. La presa de terra normalment es refereix a connectar a la terra amb un conductor. Però la terra en tecnologia electrònica pot tenir res a fer amb la terra. És només la primera equipotencial superfície en el circuit. Per exemple, la terra en ràdios i televisors és només un potencial punt de referència en el receptor circuit. La presa de terra és ambdues simples i complexes en potència i electrònica tecnologia, i és també essencial. D'acord al rol de terra, això es pot dividir en treballar posar-se, protegir posar-se a terra, sobretensió protecció posar-se a terra, antiestàtic posar-se a terra, blindatge posar-se, senyal posar-se a terra, etc. In ràdio i televisió tecnologia, el sobre posarà a aconseguirà trobaràs. Ara nosaltres elaborarem sobre alguns posats a terra qüestions tècniques basades en la situació real.
one. Protective grounding Protective grounding is a protective device set up to prevent insulation damage from causing live equipment to endanger personal life. It has two methods: grounding and zero connection. According to power regulations, for systems that use three-phase four-wire power supply, since the neutral line is grounded, the zero connection method should be used, and the metal shell of the equipment should be connected to the neutral line through a conductor, and the equipment shell is not allowed to be directly grounded. This is especially common in switching equipment in the power distribution room of the radio and television system, power switching equipment such as central air conditioners and transmitters, and large power-consuming equipment. When planning and designing, the grounding bus should be led from the ground grid to each device, and then the machine shell should be connected to the grounding bus with a conductor. It is worth pointing out that the grounding wire should be connected to the dedicated grounding terminal of the equipment, and the other end is preferably welded. Sometimes the equipment shell will feel numb. This is caused by AC leakage and the equipment shell is not connected to zero. Generally, the problem can be solved by unplugging the power plug, changing its position and then plugging it in again. In some frequently moved recording equipment, since the zero line is often ignored, some operators may touch both zero-connected and non-zero-connected equipment at the same time, and the above phenomenon may occur.
