Partial discharge test is the main test item for the insulation of power equipment, and parameters such as the amount of partial discharge are important indicators for evaluating the quality of power equipment. The NR6200 series partial discharge detector (referred to as the NR6200 system in the following description) developed by our company based on the latest international and domestic technological progress has the characteristics of the current era. It integrates computer (program-controlled amplification, filtering technology) control, data acquisition, display and printing technology in one. Display all kinds of partial discharge information with brand-new two-dimensional and three-dimensional graphics, and have printing and storage functions. The various laws of partial discharge information are fully revealed. The NR6200 system can be single-channel or dual-channel input signals. The dual-channel input mode makes it have the functions of balanced loop detection and pulse polarity discrimination detection, which lays a solid foundation for solving the most confusing interference problems in partial discharge detection.