Security Engineering eight basic common sense analysis

1. Ensure sufficient power supply for night vision cameras. The power calculation method is based on the number of infrared lights used. For example, the KL-5975 series uses 45 high-power infrared LEDs (8mm diameter, 16ML). Each group consumes approximately 90-100mA, and with 7 groups, the total is around 700mA. Adding the CCD board's consumption of about 110mA, the total is roughly 810mA. To be safe, multiply by 1.3, resulting in 1053mA or 1A. Insufficient power can severely affect the night vision performance. 2. Always choose power adapters from well-known manufacturers and preferably those with national 3C certification. Many low-quality products use refurbished components to cut costs, which may lead to early failures or voltage instability. These cheap power supplies often have minimal filtering and voltage regulation, making them unreliable when the mains voltage fluctuates. This can damage the camera and increase maintenance costs, affecting your company’s reputation. 3. In rural areas, it's recommended to use a switching power supply. Rural power grids often have low voltage, sometimes below 180V AC, which can cause the secondary output to be insufficient. If the DC output doesn’t reach 12V, the camera may freeze or fail due to unstable power. Long-term low voltage can even burn out the camera. 4. When using centralized power supply, ensure that the wire size is adequate to avoid voltage drop and current shortage. A 1-square millimeter copper wire can carry up to 3A. For night vision cameras with a range over 40 meters, the power consumption is typically around 1A. Using undersized wires can lead to poor operation and system failure. 5. Use standard video cables made with oxygen-free copper to reduce signal loss and improve image clarity. Non-standard cables may have poor shielding, leading to signal interference and potential faults. Also, use BNC connectors from reputable manufacturers, made of pure copper with gold plating, to ensure reliable connections and prevent issues like loose contacts. 6. With the onset of thunderstorm season in China, lightning protection must be considered during system design. Even if the customer does not request it, we should still check the grounding and polarity of the power supply before installation. Proper grounding is essential, even if the equipment has surge protection. Neglecting this can result in equipment damage and costly repairs. 7. It is recommended to use high-quality hard disk recorders and capture cards to ensure smooth video playback. Understanding customer needs is crucial to meet their expectations during project acceptance. Different video formats offer varying quality: CIF is suitable for small screens, HalfD1 offers better zoomed-in quality, non-real-time D1 provides clear images but lacks smooth motion, while D1 offers the best overall quality, known as the broadcast standard. Currently, D1 is the industry norm for security systems. 8. Comparison of common video compression formats: H.264 provides the best image quality at the same bitrate compared to MPEG4 and MJPEG. For instance, at 100kbps, H.264 is about 3dB (2x) better than MPEG4 and 10dB (10x) better than MJPEG. This means H.264 can store twice as much footage as MPEG4 and ten times more than MJPEG at the same quality. Therefore, H.264 is more efficient in terms of bandwidth usage and storage.

CS08A High Torque Precision Electric Screwdriver Set With Pen Clip

SUZHOU CREATION SPACE INTELLIGENT TECHNOLOGY CO.,LTD , https://www.mypkey.com