Cell phone jammer can cleanse the examination room

Keywords: electromagnetic interference; control cable; shield; ground with the power system expansion, voltage level of increase, the increase of capacity of the units, computers and microprocessors and other microelectronic devices have been widely used in power plant monitoring and control of production.     cell phone jammer    can work stably and reliably.And electronic equipment is increasingly widening the frequency bands, power gradually increased, the sensitivity increased, the cable network to contact a variety of devices has become increasingly complex. Moreover, the working environment and microelectronic monitoring device object itself is a strong alternating electromagnetic field, is a big source of interference. In this electromagnetic environment, the electronic device is bound to be electrostatic induction, electromagnetic coupling, ground potential rise, self-generated interference control circuit voltage of electromagnetic interference, which can cause electromagnetic interference with electronic devices ranging from reliability to reduce, re- then cause the device not functioning properly.     cell phone jammer    can cleanse the examination room. Zhangze plants 3, 4, 5 units have the opportunity to use the unit overhaul of its thermal control system for a DCS transformation, the use of integrated technology EIC electrical controls, instrumentation, control and computer control functions done by the DCS uniform. After a DCS transformation, the unit can safe and stable operation, to a large extent depends on the stability of the DCS system. DCS control system for high-level interference, ensure that the equipment in a complex electromagnetic environment, reliable operation, as the current power plant DCS control system electromagnetic compatibility is an important research topic.    cell phone jammer    can strengthen the discipline in the examination room. In the DCS control system, the cable is the main source of interference, it is an interference with the main generator is the main receiver. Cable as a generator, it is the electromagnetic noise radiated to space; as the absorber, can sensitively to receive interference from nearby sources of electromagnetic noise emitted. Currently, the plant control system, using shielded cable as an important measure to suppress EMI, has been widely used, but not enough to rely on the cable shield is more important is to choose the right, a good grounding. Not on the cable shield to the ground, it should be a few ground is the beginning of the cable termination, the cable terminal or ground, or both ends of the earth.  china cell phone jammer can ensure the fair and impartial competitive environment. In this paper, grounding the cable shield to make a study, for reference 1 EMI and cable port electromagnetic interference (EMI) interference into conduction and radiation interference of two categories. Conductive interference is through the power lines, ground lines and signal transmission line interference; radiation interference is spread through space interference. No matter what kind of transmission by electromagnetic interference through the port into the device. Ports mentioned here, refers to the device-specific interface with the external environment interface. Device port can be divided into shell port and cable port, the port is the device's physical shell boundary, the electromagnetic field radiated by the boundary or transmission come: cable wire connected to the device port is the port, the port can be divided into the power port cable, the signal port and function ports.This kind of   cell phone jammer is the most convenient for use.  3 cable shield points if only from the shielding effect of the shield rather than as a signal return circuit, the transmission of analog signals are not, the best shield is grounded at both ends, so that is played on the electrostatic coupling of inhibition ( electrostatic shielding), but also played for the inhibition of electromagnetic induction (electromagnetic shielding). For the electrostatic shield, the use of two grounded.