斩波器，将光依次切换到参比光路和样品光路，四扇区设计可以提供样品测试和参比测试中分别测试暗电流，增加准确性。
Switches between sample and reference beam. Four-segment design provides individual blank readings for sample and reference, increasing measurement accuracy.
在不同的光伏电池运行点采用不同的跟踪方法，通过直接控制直流斩波器开关占空比以达到快速准确的功率跟踪效果。
Different tracking approaches are applied at different operating points and the duty cycle of DC chopper is directly controlled to achieve the optimum control results.
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