When using the monitor to observe the image, why sometimes there are image distortions, distortions, inconsistent lines and fields, or even no input signal failures or phenomena?
1. The monitor's industry standard specifies that the input amplitude of the professional monitor is 1Vp-P±3dB (about 0.7Vp-P-1.4Vp-p), and the input impedance is 75 ohms. Therefore, if the input signal is not standardized due to cable attenuation, impedance mismatch, or the BNC head of the transmission cable, the input signal amplitude is much lower than 0.7 pp; either the camera output is not regulated or some irregularity is connected. When the input signal (such as distributor, amplifier, etc.) causes the input signal amplitude to be much larger than 1.4Vp-p, it may cause image distortion, line and field synchronization, etc.
2. Due to the wide video frequency range, video signals are more susceptible to interference during transmission (including 50Hz power interference, electromagnetic interference, etc.), thus affecting image quality. Severe disturbances may cause images to be distorted, deformed, raceways, and lines and fields to be out of sync. Therefore, during the installation of the monitoring system, the video line must be far away from sources of electromagnetic interference.
3. The potential difference between the front-end device, the control host device and the terminal device may also interfere with the video signal, resulting in distortion of the image signal or image appearance of a race track, if the whole system is powered on (ie, the front-end device, the master When the equipment and terminal equipment are connected to the BNC head to connect the front and rear equipment when they are powered on, it may be caused by the potential difference between the ground wire of the front and rear equipment (actually the shielding layer of the transmission cable). Fire, this severe flash fire will destroy the components at the input or the ground line in the PCB board casserole. Causes the input to open circuit and input no image fault. Therefore, the construction of monitoring system engineering should be designed and constructed in strict accordance with the specifications. The grounding bus should use copper conductors with sufficient cross-sectional area to ensure ground-to-ground resistance at the front and rear ends.
1. The monitor's industry standard specifies that the input amplitude of the professional monitor is 1Vp-P±3dB (about 0.7Vp-P-1.4Vp-p), and the input impedance is 75 ohms. Therefore, if the input signal is not standardized due to cable attenuation, impedance mismatch, or the BNC head of the transmission cable, the input signal amplitude is much lower than 0.7 pp; either the camera output is not regulated or some irregularity is connected. When the input signal (such as distributor, amplifier, etc.) causes the input signal amplitude to be much larger than 1.4Vp-p, it may cause image distortion, line and field synchronization, etc.
2. Due to the wide video frequency range, video signals are more susceptible to interference during transmission (including 50Hz power interference, electromagnetic interference, etc.), thus affecting image quality. Severe disturbances may cause images to be distorted, deformed, raceways, and lines and fields to be out of sync. Therefore, during the installation of the monitoring system, the video line must be far away from sources of electromagnetic interference.
3. The potential difference between the front-end device, the control host device and the terminal device may also interfere with the video signal, resulting in distortion of the image signal or image appearance of a race track, if the whole system is powered on (ie, the front-end device, the master When the equipment and terminal equipment are connected to the BNC head to connect the front and rear equipment when they are powered on, it may be caused by the potential difference between the ground wire of the front and rear equipment (actually the shielding layer of the transmission cable). Fire, this severe flash fire will destroy the components at the input or the ground line in the PCB board casserole. Causes the input to open circuit and input no image fault. Therefore, the construction of monitoring system engineering should be designed and constructed in strict accordance with the specifications. The grounding bus should use copper conductors with sufficient cross-sectional area to ensure ground-to-ground resistance at the front and rear ends.
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