本系统是以单片机MSP430F149为核心电路设计的恒流方式的电子负载。电子负载包括控制器、显示电路、恒流电路和电压电流检测等电路，电路利用取样和采集电路获取流经电子负载的电流和电压值，送入单片机内部集成的A/D转换器，并经过运算处理控制D/A输出，控制恒流电路，从而使直流电子负载输出电流实现设定功能，通过显示模块显示电压和电流。

The system is based on MSP430F149 single chip computer as the core circuit design of constant current mode of electronic load. Electronic load includes a controller, a display circuit, a constant current circuit and the voltage and current detecting circuit. Circuit with sampling and acquisition circuit obtains through the electronic load current and voltage values, into the MCU internal integrated A/D converter, and after processing control D/A output, control constant current circuit, so that the DC electronic load output current setting function, produced by the display module for displaying the voltage and current.