CCD is the abbreviation of Charged Coupled Device, which is a kind of semiconductor imaging device, which has the advantages of high sensitivity, strong glare resistance, small distortion, small size, long life and vibration resistance.
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Test CCD main test clarity and color reproduction, illumination, backlight compensation, followed by measuring its spherical distortion, power consumption, minimum operating voltage, the following first the resolution and color reproduction and illumination, backlight compensation measurement steps first introduce.
1, the measurement of clarity
When multiple CCDs are used for measurement, the same lens should be used (recommended to make fixed focus, two variable lenses), and the center circle of the test card appears on the left and right sides of the monitor screen, and the number of the given is clearly and accurately 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. During the test, you can focus on the distant object, or you can measure the focus. It is best to use both, you can see the difference in this CCD (convergence in the near and far).
2, 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, look at the sensitivity of the CCD, and put the color album in front of the CCD to see the clarity of the outline, too light or too thick, and respond again. Moving colored objects to record, see if there are color drag screens, delays, blurs, etc. The test conditions are as follows. The maximum illumination of the camera should be measured at 50+10V illumination at 50V, that is, the maximum illumination of each CCD is based on 10V, and the aperture should be kept in the closest state.
3, illumination
The CCD is placed in the dark room, and the active 220V incandescent lamp is used before and after the dark room. The voltage is adjusted by the voltage regulator to adjust the brightness of the dark room, and the voltage can be adjusted from 0V to 250V. Indoor lighting can also be adjusted from the darkest to the brightest. When testing, the CCD aperture is opened to the maximum to record the next minimum illumination value (the active lamp is dimmed to the inside of the darkroom). After hitting the minimum, the next minimum illuminance value is recorded, and the pressure can be adjusted separately before and after.
4, backlight compensation
There are two ways to test this parameter: one is to open the CCD on the front side of the CCD in the dark room, adjust it to the brightest, then place a picture or text below the wait, CCD welcomes the camera, sees the text And the image can be seen clearly, the picture is not glare, and adjust the AL, AX dial switch to see if there is any change, which effect is best. The other is to take the CCD out of the window in the case of sufficient sunlight, and see if the image and text can be seen clearly.
5, spherical distortion
When looking at the spherical distortion, put the test card on the front end of the CCD so that the whole sphere appears on the screen, see if there is an ellipse in the circle, move the CCD forward, see if the center of the circle is enlarged, and then test the edge, the corner, and the frame with or without the arc. Shape distortion and so on.
6, power consumption
The minimum operating voltage, use a multimeter to measure the current, use a small regulator to adjust the voltage.
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