Hemisphere Camera Frequently Asked Questions

**Problem 1: Infrared Dome Camera Color Distortion or Color Cast** This issue may occur when the automatic white balance (AWB) is not properly set, or when there are significant changes in ambient lighting conditions. To resolve this, first check if the AWB switch is in the OFF position. If it is, consider manually adjusting the white balance or improving the lighting environment to ensure consistent illumination. **Question 2: Night Vision Infrared Hemisphere Camera Works Normally During the Day but Appears White at Night** This is typically caused by reflective surfaces in the environment or a confined space, which cause infrared light to reflect back into the camera. To fix this, identify and reduce reflective materials in the area. Additionally, verify that the infrared range of the camera matches the actual installation distance. Using a long-range infrared camera in a small space can result in over-saturation and a white image due to excessive infrared light. **Question 3: IR Dome Camera Series Shows Poor Illumination, White or Bright Iris Effect at Night** This problem is often due to improper assembly. If the photosensitive device (photoresistor) is positioned too far from the infrared dome during installation, the infrared lights may not activate fully, leading to poor night-time illumination. The white or bright iris effect usually occurs when infrared light is refracted through the dome cover into the lens. To prevent this, use a sponge ring to isolate the lens from the infrared light and ensure the dome is tightly secured during installation. **Question 4: Black Bars or Lines Appear on the Screen** This issue is commonly caused by high ripple in the power supply output. To resolve it, improve the filtering system and use a high-quality DC power supply to stabilize the voltage. **Problem 5: Poor Waterproofing and Heat Dissipation** After prolonged use, especially in northern regions, moisture or condensation may accumulate inside the camera. This is usually due to insufficient sealing of the housing and inadequate consideration of temperature differences. When the infrared lamp operates, it generates heat, and if the heat dissipation is poor, it can significantly shorten the camera's lifespan. A solution is to design the housing with multiple ventilation channels to improve heat dissipation. **Question 6: Insufficient Color Reproduction During the Day** You may notice a color cast in daytime images, which is often due to the camera’s filter. Most infrared dome cameras use a dual peak filter to allow some infrared light, which can interfere with color accuracy under natural light. For example, green plants may appear gray. Using an IRCUT dual filter, which includes an IR cut filter and full-spectrum glass, helps maintain accurate color during the day and improves infrared performance at night. **Question 7: Infrared Dome Camera Has No Image** First, check the polarity of the external power supply and ensure the output voltage meets the requirements (DC12V±10% or AC24V±5%). Then, verify that the video cable is securely connected. If using a manual iris lens, make sure the aperture is open. Adjust the LEVEL potentiometer to set the aperture correctly. **Question 8: Poor Image Quality of Infrared Dome Cameras** Check the following: a. Is the lens clean and free of fingerprints? b. Is the aperture properly adjusted? c. Is the video cable making good contact? d. Are the electronic shutter and white balance settings correct? e. Is the transmission distance too long? f. Is the power supply voltage stable? g. Are there any nearby sources of interference? h. If installed in an elevator, ensure it is insulated from electrical interference. i. Check if the CS interface is properly connected. **Problem 9: Image Distortion or Geometric Distortion** This could be due to issues with the IR dome camera itself, the monitor’s geometry correction circuit, the optical lens, or mismatched impedance between the video cable and the camera. When distortion occurs, check if the lens is functioning properly, ensure the monitor’s input impedance is set to 75Ω, and confirm that the video cable also has a 75Ω impedance.

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