When multiple surveillance cameras are tested, the same lens should be used (fixed focus and two variable lenses are recommended). The center circle of the test card appears on the left and right sides of the monitor screen. The given scale lines are clearly and accurately counted, including 10 groups of vertical lines and 10 groups of horizontal lines. They represent the vertical definition and the horizontal definition respectively, and the corresponding group has given the number of lines. If vertical 350 lines and horizontal 800 lines, it is better to use black and white monitors. When testing, it can focus on the far scene, or focus while testing. It's better to use both of them. You can see the difference of this camera (for far and near convergence).
2/F, Building H, Zhiyihan Industrial Park, Yuanling Village, Shiyan Town, Baoan District, Shenzhen 518108