Interpretation of monitoring equipment to buy small common sense

[ Huaqiang Security Network News ] 1. The camera part of the camera is usually installed on site. It includes camera, lens, protective cover, bracket and electric pan/tilt. Its role is to take pictures of the surveillance area and convert it into electrical signals.
The camera is divided into color and black and white. Generally, the black and white camera is more sensitive than color. It is suitable for use in places with insufficient light. If the purpose of the camera is to monitor the position and movement of the scene, black and white cameras can be used. The details of the camera, such as the color of the clothes and the scene, are better in color.
Camera
The specifications of the camera can be divided into 1/3〃, 1/2〃 and 2/3〃, etc. The installation method is fixed and there are two types of heads.
Second, the lens commonly used lens types include: manual / automatic aperture fixed focus lens and automatic aperture zoom lens.
Fixed-focus lenses are classified into standard lenses and wide-angle lenses. The scope of application of the fixed focus lens is as follows:
Manual iris lens: The ambient illumination that needs to be monitored does not change much, such as indoors.
Auto iris lens: The ambient illumination that needs to be monitored varies greatly, such as outdoors.
Wide-angle lens: The angle of observation is wider and the distance is closer.
Standard lens: The angle and distance of the surveillance are moderate.
The zoom lens is divided into 10x, 6x and 2x zoom lenses, and the other is divided into manual zoom and power zoom (electric aperture and auto iris).
The zoom lens can be divided into rules: 1/3 〃, 1/2 〃, and 1 〃.
The principle of selecting a zoom lens is that the lens size should not be smaller than the camera's specifications, which means that a 1/2 inch lens can be used with a 1/3 inch camera, but a 1/3 inch lens cannot be used in 1/1. 2 〃 used on the camera.
Third, the protective cover is an important component in the monitoring system. It is a protective device that makes the camera work normally in the presence of dust, rain, high and low temperatures. The protective cover is divided into indoor type and outdoor type.
One type is an indoor protective cover, which is simple in structure and inexpensive. Its main function is dustproof, preventing the camera from falling ash, and has certain security protection functions, such as anti-theft, anti-destruction, and some also have concealing effects, so that the monitoring occasions and objects are not easily detected and monitored.
The other type is an outdoor protective cover, which is generally an all-weather protective cover, that is, the camera installed in the protective cover can work normally regardless of wind, rain, snow, high temperature, low temperature and the like. Some outdoor protective cover glass can also be heated, and when the protective cover has frost, it can be heated and defrost. Therefore, the protective cover has the functions of cooling, warming, rainproof, snowproof and the like.
At the same time, in order to make the camera normally capture images in rainy and snowy weather, a controllable wiper is usually installed in front of the glass window of the all-weather protective cover. Currently, a better all-weather protective cover is a protective cover that uses a semiconductor device to warm and cool down. The shield is equipped with a semiconductor body that can be automatically heated or automatically cooled, and consumes less power.

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