Transformer DC Resistance Tester

The DC resistance tester (micro-ohmmeter) is a high-precision replacement product for DC single and double-arm bridges. The DC resistance fast tester adopts switching power supply technology and displays measurement results via a dot-matrix LCD screen. It overcomes the drawback of other similar products where LED display values are difficult to read in sunlight, while also featuring an automatic arc suppression function.

DC resistance testing is an essential test item for transformers after handover, major overhauls, and tap changer adjustments. Typically, measuring the DC resistance of transformer windings and high-power inductive equipment using traditional methods (bridge method and voltage drop method) is a time-consuming and labor-intensive task. To address this situation, the DC resistance fast tester was developed to shorten measurement time and reduce the workload of test personnel. With a high-speed microcontroller as the core, built-in rechargeable battery and charging circuit, and utilizing high-speed A/D converter and programmable current source technology, it achieves excellent measurement results and highly automated measurement functions. It features high precision, wide measurement range, stable data, good repeatability, strong anti-interference capability, and comprehensive protection functions. It is compact, lightweight, and portable. It offers fast measurement, ease of use, high measurement accuracy, and rapid charging and discharging speeds. Self-check and automatic calibration functions reduce the difficulty of instrument use and maintenance, making it an ideal device for measuring the DC resistance of transformer windings and high-power inductive equipment.

The DC resistance tester is a new-generation instrument for testing transformer DC resistance. It can automatically select test currents based on different types of power transformers and display test results at high speed. The DC resistance tester also features functions such as storage, printing, and discharge indication. It comes with built-in non-volatile memory for long-term data storage. The use of an LCD screen provides a user-friendly interface, making it a common device in DC resistance testing work.

The DC resistance tester is a high-precision, wide-range resistance tester controlled by a high-performance microprocessor. It can test resistances from 1μΩ to 3MΩ, displaying up to 30,000 counts. With a test speed of 60 times per second, it can still ensure an accuracy of 0.05% even at 15 times per second, and reading fluctuations can be controlled within 3 digits. It comes standard with temperature compensation functionality for resistance testing. Three current modes meet various demanding resistance testing requirements. The transformer DC resistance tester is a new instrument designed for measuring the DC resistance of large-capacity transformers. It integrates a high-precision constant current source and testing components, with the testing process controlled by a microcomputer to automatically complete constant current judgment, data acquisition, data processing, resistance value display, and printing.

The DC resistance tester is a high-precision replacement product for DC single and double-arm bridges. The instrument adopts switching power supply technology, making its measurement speed over a hundred times faster than bridges. The display section uses a four-and-a-half-digit LCD to show measurement results and a three-and-a-half-digit LCD to display ambient temperature or test current values. It overcomes the drawback of other similar products where LED display values are difficult to read in sunlight, while also featuring an automatic arc suppression function. This instrument offers advantages such as fast measurement speed, high precision, intuitive display, strong anti-interference capability, compact size, low power consumption, stable and reliable test data, and immunity to human factors. The instrument is equipped with a built-in rechargeable battery pack (12V) and supports both AC and DC power, making it convenient for on-site and field testing.