Explosion-proof monitor failure causes and maintenance methods

A black or white bar appears on the screen of the explosion-proof electrical monitor and scrolls up or down, which is the so-called 50 Hz power frequency interference. This type of interference is caused by the potential difference loop between the front end and the control center, which causes potential difference loops to enter the system. It is also possible that the power supply performance of the device itself is reduced.

The image has snowflake noise. This kind of interference is mainly caused by the attenuation of the signal on the transmission line and the coupling of high-frequency interference.

The video image has ghosting, or the image is whitish, the character is jittery, or a number of equally spaced vertical bars interfere on the screen of an explosion-proof electrical monitor. This is because the characteristic impedance between the video transmission line or the device is not 75Ω, resulting in impedance mismatch.

Twill interference, jitter, power interference. When this interference is slight, it does not overwhelm the normal image, but when it is severe, the image is distorted and cannot be viewed. The reason for this is more and more complicated. For example, the quality of the video transmission line is not good, especially the shielding performance is poor, or the power supply of the power supply system has clutter, and there may be a strong interference source near the system.

Large area moire interference, also known as single-frequency interference. This phenomenon is mainly caused by the short circuit caused by the short circuit of the core wire of the explosion-proof electrical appliance video cable and the screen, the failure caused by the open circuit, or due to the bad contact of the BNC connector.

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