Product Overview
The ZGY-20A DC Resistance Tester is a portable instrument used for measuring the DC resistance of equipment such as transformers, instrument transformers, motors, and switches. The instrument adopts high-frequency switching power supply technology and microprocessor control, featuring fast measurement speed, good stability, and simple operation. It is suitable for preventive testing and maintenance of power systems and industrial electrical equipment.
Technical Parameters
1. Output current: Multiple selectable ranges including 20A, 10A, 5A, 1A, 0.1A, etc., adapting to measurement needs of different resistance ranges.
2. Measurement range: 0～20kΩ (varies depending on current range).
3. Accuracy: 0.2%±2 digits (at rated current).
4. Resolution: 0.1μΩ.
5. Power supply: AC 220V±10%, 50Hz/60Hz.
6. Display: Large-screen LCD display, supporting data storage and query.
7. Working environment: Temperature -10℃～50℃, relative humidity ≤85%RH.
8. Dimensions and weight: Approximately 360mm×280mm×160mm, weight approximately 6kg (subject to actual product).
Functional Features
The instrument features automatic range switching, back electromotive force protection, and discharge indication. During measurement, it can display resistance value, current value, and test time in real time. It has a built-in rechargeable battery pack, supporting both AC and DC power supply, making it convenient for on-site use in locations without power supply. It is equipped with RS232 or USB interface, with optional data transmission software for exporting and analyzing measurement data.
Application Scenarios
Suitable for electrical equipment maintenance in power plants, substations, distribution rooms, and industrial enterprises. Typical applications include: DC resistance measurement of transformer windings, resistance testing of instrument transformer windings, resistance detection of motor stator/rotor windings, resistance measurement of circuit breaker conductive circuits, etc. The instrument helps detect defects such as inter-turn short circuits in windings, poor joint welding, and poor contact of contacts, providing reference basis for equipment condition assessment.
