Test surveillance cameras are mainly test clarity and color reproduction, illumination, backlight compensation, followed by measuring the camera distortion, power consumption, minimum operating voltage, let us understand the clarity and color reproduction and illumination The measurement step of backlight compensation. This article refers to the address: http:// 1. Measurement of sharpness When using multiple surveillance cameras for testing, the same lens should be used (recommended for fixed focus, two variable lenses), and the center circle of the test card appears on the left and right sides of the monitor screen, clearly and accurately counted out. The tick marks a total of 10 sets of vertical lines and 10 sets of horizontal lines. They represent vertical and horizontal resolution, respectively, and the corresponding set of lines has been given. If the vertical 350 line level is 800 lines, it is best to use a black and white monitor at this time. You can focus on the distant object during the test, or focus on the side. It is best to use both, and you can see the difference in this camera (convergence in the distance). 2. Surveillance camera color reduction test Test this parameter should choose a good color monitor. First, observe the characters and costumes from a distance, see if there is any color distortion, compare the objects with bright colors, watch the sensitivity of the surveillance camera, and put the color album in front of the surveillance camera to see the clarity of the picture, too light or too thick, again You should record the moving color objects to see if there are color tails, delays, blurs, etc. The test condition is such that the maximum illumination of the camera should be measured at 5010V illumination at 50V, that is, 10 volts is added to the maximum illumination of each surveillance camera, and the aperture should be kept in the closest state. 3. Illuminance The surveillance camera is placed in the darkroom, and the active 220V self-igniting lamp is placed in front of and behind the darkroom. A voltage regulator is arranged to adjust the voltage of the darkroom to adjust the voltage of the darkroom. The voltage can be adjusted from 0V to 250V. The indoor illumination can also be adjusted from the darkest to the brightest. When the camera aperture is turned to the maximum during the test, the next minimum illumination value is recorded. (The active lamp is dimmed to the inside of the darkroom.) After hitting the minimum, the next minimum illuminance value is recorded, and the front and rear lights can be separately pressed and extinguished. 4. Surveillance camera backlight compensation There are two ways to test this parameter: one is to open the front side of the camera in the dark room, adjust to the brightest, then place a picture or text below the light, the surveillance camera welcomes the camera, see the image Whether the text can be seen clearly, the picture is not glaring, and adjust the AL, AX pull switch to see if there is any change, which effect is best. The other is to take the camera out of the window in the sun, and see if the image and text can be seen clearly. 5. Surveillance camera distortion Look at the surveillance camera distortion. Place the test card on the front of the camera so that the whole sphere appears on the screen. Look at the spherical shape with or without an ellipse. Move the camera forward to see if there is any magnification in the center of the circle, and then test the edges, corners, and frames for arcs. Shape distortion and so on. 6. Monitor camera power consumption The lowest working voltage, using a multimeter to measure current, using a small regulator to adjust the voltage. In the security system, the image generation is mainly from the CCD camera. CCD is the abbreviation of charge coupled device (charge coupled deice), which can turn light into electric charge. The charge is stored and transferred, and the stored charge can be taken out to change the voltage. Therefore, it is an ideal camera component. The CCD camera constructed by the CCD camera has a small size, is light in weight, is not affected by a magnetic field, and is resistant to earthquakes and impacts. Features are widely used. LiFePO4 Lithium Wall Mounted Battery
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