DC resistance tester isan indispensable experimental item for transformers after handover, major repairs, and changes to tap changers. Under normal circumstances, using traditional methods (bridge method and voltage drop method) to measure the DC resistance of transformer windings and high-power inductive equipment is a time-consuming and labor-intensive task. It adopts brand-new power supply technology and has characteristics such as stable performance, fast measurement, compact size, convenient operation, high measurement accuracy, and good data repeatability. It is an ideal device for measuring the DC resistance of transformer windings and high-power inductive equipment.

　　It adopts the typical four-wire measurement method to improve the accuracy of measuring resistance (especially low resistance). The programmable constant current source, programmable preamplifier, and A/D converter constitute the main body of the measurement circuit. The central control unit applies a constant, high-precision current to the external load under test by controlling the constant current source, and then processes the obtained data (including test voltage, current test current, etc.) to obtain the actual resistance value.