The IT-M3900D series is a single channel output programmable DC power supply with a compact design to save rack space. The wide range of output design can provide a wider range of voltage and current combinations within the specified power range. One unit can be used as multiple power supplies, providing more flexibility. The CC/CV priority allows users to switch the output mode according to the different needs of the DUT priority, matched with the high-precision and high-speed product characteristics, and a variety of standard communication interfaces, simplifies and speeds up the test development. Thus, meeting the users’ variety of testing applications, widely used in laboratories, production lines, and automatic test systems.