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Steps/methods
1. Status of the camera: Malfunction analysis of the transformer: unstable power supply noise Solution: Replace the transformer
2. Status of the camera: Malfunction of the line Cause: Too many connectors or poor line contact Solution: Replace the line
3. Status of the camera: Analysis of the causes of several vertical stripes with equal spacing: Since the characteristic impedance of the video transmission line is not 75Ω, it results in impedance mismatch. Or by the video cable's characteristic impedance and distribution parameters do not meet the requirements caused by the synthesis.
Solution: Generally rely on 'start resistance series' or 'terminal resistance resistors' to solve.
4. Camera status: Caused by the appearance of wood-grained interference: The quality of the video transmission line is not good, especially the poor shielding performance, and the line resistance is too large, which results in a large attenuation of the signal. Or because the power supply system is not 'clean'.
Solution: Change the video cable or increase the sleeve. The problem of power supply can basically be solved by using a clean power supply or an on-line UPS for the entire system.
5. Camera status: A black bar or white bar appears on the screen of the monitor. Cause Analysis: The most common fault phenomenon is 50-cycle power frequency interference. This phenomenon is mostly caused by the system generating a ground loop and introducing 50 weeks. The existence of the ground loop caused by the power frequency interference (AC interference) may be caused by the repeated grounding of the common end of the signal transmission line at both ends, or the short circuit between the common end of the signal line and the neutral of the 220V power supply. Or the common terminal of a device in the system has a short circuit with the 220V AC power supply; it may also be caused by a strong magnetic field generated by the AC power supply (such as the two parties are too close together).
Solution: The solution is to connect the transformer in the form of a longitudinal choke (also known as a neutralization transformer), or to use a 'longitudinal choke' on the transmission line to eliminate this type of interference.
6. Status of the camera: Analysis of long line causes: The line is too long or the signal attenuation solution: Due to the loss of the high-frequency end of the image signal is too large, resulting in the basic loss of signals above 3MHz frequency. This situation may be due to the fact that the transmission distance is too long, and there is no amplification compensation device in the middle; or the distribution capacitance of the video transmission cable is too large; or the equivalent capacitance is concentrated in the transmission link between the core wire and the shielded wire. As a result, signal amplifiers should be added.
Analysis: What to do if there is a black image in the surveillance camera image?
When the surveillance camera is installed and used, it often encounters some faults. There are no images, unclear images, focal lengths, etc. Some of these problems are caused by the camera itself, and some are caused by improper installation and use. This article focuses on the analysis of the surveillance camera. There are black map solutions for your reference.