Automated Temperature Screening Kiosk

body temperature kiosk

The causes of interference are as follows:

1. The quality of video transmission line is not good, especially the shielding performance is poor.

2. There is a strong interference source near the system.

3. The fault caused by short circuit and open circuit between the core wire of video cable and shielding network.

4. Fault caused by mismatch of characteristic impedance of transmission line.

5. Space radiation interference introduced by transmission line.

6. Failure caused by the power supply of the power supply system.

The solution of signal interference caused by the above factors is simply analyzed

1. The quality problem of video transmission line. The line resistance of this kind of video line is too high, which leads to a large signal attenuation, which is also the cause of aggravating the fault. In addition, the characteristic impedance of this kind of video line is not 75 Ω and the parameters are beyond the specification.

2. The interference source near the system is too strong. It can strengthen the shielding of the camera and ground the video cable.

3. The core wire of video cable is short circuited and short circuited. When this kind of fault occurs, LCD splicing wall often does not cause problems in all the signals of the whole system, but only appears in the number of bad connections. It can be solved by carefully checking these joints one by one.

4. Fault caused by mismatch of characteristic impedance of transmission line. This phenomenon is caused by the fact that the characteristic impedance and distribution parameters of the video cable in the LCD wall system do not meet the requirements. This situation can be solved by the method of "connecting resistance in series at the beginning" or "connecting resistance in parallel at the terminal".

5. Space radiation interference introduced by transmission line. The solution to this situation is to understand the surrounding environment and try to avoid or keep away from the radiation source when the system is established. When the radiation source cannot be avoided, the front-end and central equipment shall be shielded, and the pipeline of transmission line shall be steel pipe and well grounded.

6. Power supply problem of power supply system. There are interference signals superimposed on the normal power supply. In this case, as long as the whole system of LCD splicing screen is provided with purified power supply or online UPS power supply, it can be basically solved.