The DC resistance of a transformer is a mandatory test item in the manufacturing process for semi-finished and finished products, factory acceptance tests, installation, major repairs, after changing tap changers, handover tests, and preventive tests by power departments. It can check the welding quality of winding connections and whether there are inter-turn short circuits in the windings, detect whether the contacts at various positions of the voltage tap changer are in good condition and whether the actual position of the tap changer matches the indicated position, whether the lead wires are broken, and whether there are broken strands in multi-strand parallel windings. To meet the need for rapid measurement of transformer DC resistance, our company has developed the GDZRC-100A DC Resistance Tester. This instrument adopts brand-new power supply technology and features small size, light weight, high output current, good repeatability, strong anti-interference capability, and comprehensive protection functions. The entire unit is controlled by a high-speed microcontroller, with a high degree of automation, and has automatic discharge and discharge alarm functions. The instrument offers high testing accuracy and simple operation, enabling rapid measurement of transformer DC resistance. 10A DC Resistance Tester