Switchable multi-channel wide-range DC resistance test circuit and method

The invention relates to a switchable multi-channel wide-range direct-current resistance test circuit and method. The switchable multi-channel wide-range direct-current resistance test circuit comprises an MCU micro-control unit, an energy battery system module, a man-machine interaction module, a high-precision signal acquisition module, a high-precision program-controlled constant-current source module, a clock module, a data storage module and an access switching control module. The device has the functions of variable range, multi-channel automatic switching of test loops, automatic checking and accounting of measurement data, data storage and export and the like, and can avoid repeated manual plugging and unplugging of test wires, data recording and data accounting; the measurement channel automatic switching loop realizes the switching of the measurement channel through a relay, and avoids manual operation; a Kelvin four-wire method measurement loop is used for realizing high-precision measurement of th