The test camera is primarily used to evaluate sharpness, color reproduction, illumination, and backlight compensation. In addition, it measures ball distortion, power consumption, and the minimum operating voltage. Below are the detailed steps for testing sharpness, color reproduction, illumination, and backlight compensation.
1. **Sharpness Measurement**
When testing multiple cameras, it's important to use the same lens—ideally a fixed-focus lens or two variable lenses. The center circle of the test chart should appear on both the left and right edges of the monitor screen. The chart features 10 vertical and 10 horizontal lines, representing vertical and horizontal resolution respectively. For example, if the vertical resolution is 350 lines and the horizontal is 800 lines, a black and white monitor is recommended. During testing, focus on distant objects as well as close-up details. Using both methods helps identify how well the camera handles focus convergence at different distances.
2. **Color Reproduction Test**
This test requires a color monitor. Start by observing characters and costumes from a distance to check for color distortion. Compare vividly colored objects to assess the camera’s sensitivity. Use a color picture book in front of the camera and check for clarity, over-saturation, or under-exposure. Also, observe motion to detect issues like color smearing, lag, or blur. The test should be conducted at maximum illuminance (50V), with an additional 10V applied (total 60V). The aperture should remain fully open during this process.
3. **Illumination Test**
Place the camera in a darkroom with a 220V incandescent lamp positioned before and after the room. A voltage regulator is used to adjust the brightness of the lamp, allowing control from 0V to 250V. This enables the adjustment of indoor lighting from completely dark to very bright. When the camera’s aperture is fully open, record the minimum illuminance value by dimming the light until the image becomes invisible. Then, note the next measurable illuminance level.
4. **Backlight Compensation Test**
There are two methods for this test. One involves placing the camera in a darkroom, turning on the front lamp to its brightest, and positioning a picture or text under the light. Check if the image is visible without being overly bright, and adjust the AL/AX switch to see which setting provides the best result. The second method is to take the camera near a window during daylight and check if the image remains clear and not washed out.
5. **Ball Distortion Test**
Position the test card in front of the camera so that the entire sphere appears on the screen. Observe whether the sphere appears elliptical or distorted. Move the camera closer to check if the center of the circle is magnified. Then, examine the edges, corners, and frame at a distance to ensure there is no arc distortion or warping.
6. **Power Consumption and Minimum Operating Voltage**
Use a multimeter to measure current draw. Adjust the voltage using a small regulator to determine the minimum operating voltage at which the camera can still function properly. This helps identify the lowest power threshold for reliable operation.
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