Use STM8 high-speed single-chip microcomputer to do voltage sampling test, and drive LED light to display voltage, realize board integration, reduce the defect rate (because the current is constant, there is only voltage display function).
0-300V adaptive voltage, suitable for most series and parallel lamp bead test. During the test, the progressive start mode is adopted, the voltage is automatically adapted, and the current is gradually increased, so the lamp bead will never be burned, and the normal brightness can be achieved after three to five seconds. Even if the light bar and the lamp bead are reversed, the light bar and the lamp bead will not be burned.