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Shenzhen Changhong Microelectronics Co.,Ltd

Surveillance Camera Basics Knowledge Part A

What are the classifications of Yuntai and their functions?


A: There are indoor and outdoor points. The main function of the indoor protective cover is dustproof. In addition to dustproof, the outdoor protective cover plays a major role in protecting the camera in harsh natural environments (such as rain, snow, low temperature, high temperature, etc.). ) work under. This not only requires a strict sealing structure, but also has a wiper, a sprinkler, etc., and has a function of heating and cooling. This determines that the price of the outdoor shield is much higher than the indoor shield. It should also be noted that when choosing a protective cover, the nominal size of the protective cover is the same as the nominal size of the camera. If it is difficult to be consistent, a large-size protective cover can be used with a small-sized camera; otherwise, it can't.


What is the bracket and classification of the camera?


A: The parts used to fix the camera are wall mounted, hoisted, etc. The choice of the bracket is relatively simple, as long as the load capacity is greater than the total weight of the equipment installed on it, otherwise the bracket deformation is likely to occur, and the pan/tilt rotates to cause jitter, which affects the quality of the monitored image.


What is a cloud mirror control decoder?


A: The decoder is a device that converts the control signal sent from the front end into a voltage signal to control the pan/tilt and the lens.


What is a coaxial cable?


A: The name of the coaxial cable (COARIALCABLE) is related to its structure. Coaxial cable is also one of the most common transmission media in surveillance. The pair of conductors used to transmit information is formed by a cylindrical outer conductor sleeve outside the inner conductor (a thin core), and the two conductors are separated from each other by an insulating material, and the outer conductor and The center of the center axis is on the same axis, so it is called a coaxial cable, and the impedance is 75 ohms. The reason why the coaxial cable is designed to prevent external electromagnetic waves from interfering with the transmission of abnormal signals.


What is the transmission distance of the coaxial cable?


Answer: According to the basic requirements of PAL-D video distortion in China, the measured value of transmission line without compensation transmission distance is: 75-7 coaxial cable is about 200-250m, 75-5 is about 100-150m.


What are the specifications for coaxial cables?


A: Domestic coaxial cable has SYV75-3, SYV75-5, SYV75-7, SYV75-9 and other specifications


What is twisted pair transmission?


A: Twisted Pair (TP: Twisted Pairwire) is the most commonly used transmission medium in integrated wiring engineering. The twisted pair consists of two copper wires with an insulating protective layer. Twisting two insulated copper wires together at a certain density reduces the degree of signal interference, and the electric wave radiated by each wire during transmission is cancelled by the electric wave emitted from the other wire. The twisted pair is generally formed by winding two 22- to 26-gauge insulated copper wires. Its characteristic impedance is about 100Ω, and the distributed capacitance is about 15pF/m. Unlike coaxial cable, the signal is transmitted in a balanced manner in the twisted pair. With twisted pair video transmission equipment and twisted pair, it can be guaranteed. High-quality video signals can be transmitted over a distance of 1.5Km.

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