The use of pan-tilt enlarges the camera's field of vision. In the TV monitoring system, Yuntai is often used in halls, playgrounds, squares and other places that need patrol monitoring. Pan/tilt is generally divided into ordinary pan/tilt and spherical pan/tilt. Ordinary pan/tilt is a naked pan/tilt, so it is necessary to install a camera protective cover when installing the camera. Spherical tripod head is a built-in tripod head with a spherical or hemispherical protective cover outside, so spherical tripod head is more beautiful, hidden and easy to install than ordinary tripod head. 1. Pay attention to the following points when choosing a pan/tilt: (1) Distinguish between indoor and outdoor installation. Compared with indoor Yuntai, outdoor Yuntai has better waterproof, corrosion resistance, constant temperature and impact resistance to adapt to outdoor complex climate conditions, and its weight and bearing capacity are also greater than those of indoor Yuntai. (2) According to special environmental requirements. Such as hotels, residential areas, government agencies, office buildings and other places, generally have higher requirements on the concealment of products after installation, so spherical ptz is often used. It should be noted that, because the indoor dome platform needs to be embedded and installed, it cannot be installed if the top of the wall cannot be hollowed out. (3) If you add a infrared lamp to the camera, you must choose an ordinary pan/tilt. You can't hang infrared lamp on a spherical pan/tilt. (4) Because there is no mechanical wiper in the spherical pan/tilt, if the wiper function must be used, you can only choose the ordinary pan/tilt with wiper cover. Second, the failure of Yuntai A Yuntai is not easy to use or can't rotate at all soon after use, which is a common failure of Yuntai. Apart from the factors of product quality, this situation is generally caused by the following reasons: (1) Only the tripod head with camera is allowed to be hoisted when it is used. In this case, the hoisting mode will increase the operating load of the pan/tilt, so it will soon lead to the damage of the pan/tilt rotating mechanism and even burn out the motor. (2) The total weight of the camera and its protective cover exceeds the bearing capacity of the tripod head. Especially for outdoor use, the weight of the protective cover is often too large, which often leads to the problem that the platform cannot turn (especially in the vertical direction). (3) The outdoor Yuntai platform is out of order or even damaged due to the high or low ambient temperature and inadequate waterproof and antifreeze measures. 2. When the distance is too far, the operating keyboard can't remotely control the camera (including lens) and pan/tilt through the decoder. This is mainly because the control signal is too attenuated when the distance is too far, and the control signal received by the decoder is too weak. At this time, it is necessary to install a relay box at a certain distance to amplify the shaping control signal. 3. The image contrast of the monitor is too small and the image is very weak. This phenomenon is either the problem of the control host and the display itself, or the transmission distance is too long or the video transmission line is too attenuated. In this case, line amplification and compensation devices should be added. 4. The image definition is not high, and the details are lost. In severe cases, the color signal is lost or the color saturation is too small. This is because the high-frequency loss of image signals is too large, and the signals with frequencies above 3MHz are basically lost. In this case, the transmission distance is too long, and there is no amplification compensation device in the middle; Or the distributed capacitance of the video transmission cable is too large; Or the concentrated distribution of equivalent capacitance between the core wire and the shielding wire of the transmission line in the transmission link.