Programmable DC electronic load, using high-performance chips, high-speed, high-precision design, providing 1mV, 1mA resolution, superior performance, programmable DC electronic load can be widely used in chargers, switching power supplies, linear power supplies, various batteries, etc. Industry production line testing, scientific research institutions and other experimental research and development fields. Provide CC, CV, CR, CP and several basic measurement modes of CC+CV, CR+CV; Provide professional battery test and LED test; Dynamic test mode, which can test the dynamic output performance of power supply; Scan test mode, which can test the power output continuity within a certain range; List mode, which can simulate a variety of load status changes; Short circuit test, used to simulate load short circuit; Remote measurement mode, improve measurement accuracy at high current; DC electronic load supports external trigger input; DC electronic load built-in buzzer alarm; The DC electronic load has the function of data storage after power failure; The DC electronic load can be operated remotely through the RS-232 interface and the USB Device interface; Multiple security protection: The DC electronic load has overvoltage, overcurrent and overpower protection functions, and can flexibly set overvoltage and overcurrent parameters to achieve effective protection of the load; The DC electronic load has a secondary over-temperature protection function to realize double over-temperature protection of software and hardware; The DC electronic load has an intelligent fan speed control function, which effectively reduces the fan noise during operation; The DC electronic load has the output polarity reverse protection;