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2. Monitoring camera color reproducibility test <br> Test this parameter should be selected 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. Illumination <br> The surveillance camera is placed in the darkroom. The front and rear of the darkroom are active 220V self-igniting lamps. Voltage regulators are installed 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 <br> There are two ways to test this parameter: one is to open the camera front side voltage regulator in the dark room, adjust to the brightest, then place a picture or text below the lamp to monitor The camera welcomes the camera, can see if the image and text can be seen clearly, the picture is not glare, 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 <br> See surveillance camera distortion Put the test card on the front of the camera so that the whole sphere appears on the screen, see if the sphere has an ellipse, move the camera forward, see if the center of the circle is enlarged, and then test the edge at a distance. Whether the corners and frames have arc distortion or the like.
6. Surveillance camera power consumption <br> Minimum operating voltage, use a multimeter to measure current, use a small regulator to adjust the voltage to see the security system, the image is currently generated mainly from the CCD camera, CCD is the charge coupled device (chargecoupleddeice) It can convert light into electric charge and store and transfer electric charge, and can also take out the stored charge to change the voltage. Therefore, it is an ideal camera component. The CCD camera constructed by it has small volume, light weight and no magnetic field. It is widely used because of its influence, its characteristics of anti-seismic and impact.
What are the camera test steps and their methods?
[ Huaqiang Security Network News ] Today, Xiaobian takes everyone to understand the camera test steps and methods: 1. Measurement of sharpness <br> When testing multiple surveillance cameras, the same lens should be used (recommended for fixed focus, two variable lens), and the center circle of the test card appears on the left and right sides of the monitor screen, which is clear. Accurately count the given tick marks for 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).