This user manual introduces the panel operation, technical specifications, installation, and communication interface reference of the IT8500 series DC programmable electronic load from Edex Electronics (Nanjing) Co., Ltd. The product features various operating modes such as constant current, constant resistance, constant voltage, and constant power. It supports dynamic testing operations in continuous mode, pulse mode, and trigger mode, as well as sequential operation and triggered operation. Furthermore, the product has protection functions for overvoltage, overcurrent, over power, and over temperature, as well as remote testing, access control, and battery discharge testing.