Number of views：2020order Release Date：2020-11-26

1. The industry standard rule for LCD monitors is that the input signal fluctuation of professional monitors is 1Vp-P ± 3dB, and the input impedance is 75 ohms. Therefore, if the input signal has a voltage rise much lower than 0.7p-p due to cable attenuation, impedance mismatch, or non-standard manufacturing of the BNC head of the transmission cable, etc; Perhaps due to the non-standard output of the camera or the connection of some non-standard access devices, when the input signal voltage is much greater than 1.4Vp-p, it can cause image distortion, line field asynchrony and other phenomena.

2. Due to the wide frequency range of videos, video signals are more susceptible to interference during transmission, which can affect the quality of the images. Severe disturbance can cause distortion, deformation, rolling, and unsynchronized movement in the picture. Therefore, during the installation of the monitoring system, it is necessary to keep the video cable away from electromagnetic wave interference sources.

3. The potential difference between front-end devices, control host devices, and terminal devices can also interfere with video signals. Shenzhen LCD splicing wall manufacturers explain that distortion of picture signals or picture presentation raceways can cause ground to ground arcing due to the potential difference between the ground wires of front-end and back-end devices when the entire system is electrified. In severe cases, this arcing can damage input components or ground level wiring in PCB sand pots. The input terminal is open and there is no picture problem with the input. Therefore, the construction of monitoring system engineering should be strictly planned and constructed according to standards. The grounding busbar should be made of copper wires that meet the cross-sectional area requirements, ensuring that the ground to ground resistance at the front and rear ends is less than 1 Ω. The grounding wire should not form a closed circuit and should not be short circuited or mixed with the neutral wire of the high-voltage network.

Shenzhen Jintong Display Technology Co., Ltd

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