The electrical integrity of a grounding system refers to the electrical connectivity between various electrical equipment that should be grounded within the grounding system, as well as among different parts of the grounding system and each piece of equipment. This is also known as electrical continuity, measured by the DC resistance value. Reliable and effective connection between the grounding lead-down wire of power equipment and the grounding grid is the fundamental guarantee for the safe operation of the equipment. The grounding lead-down wire serves as the connecting part between power equipment and the grounding grid. During long-term operation of power equipment, factors such as moisture can affect the connection points, leading to corrosion or even breakage. This increases the resistance at the connection point between the grounding lead-down wire and the main grounding grid, failing to meet the requirements of power regulations, posing potential safety hazards during operation, and in severe cases, causing the equipment to lose its grounding. Underground grounding electrodes and their connecting parts in the grounding system may also suffer from corrosion or breakage. Therefore, it is necessary to regularly perform electrical integrity tests on grounding systems.

According to the electric power industry standard DL/T475-2006 "Guidelines for Measurement of Characteristic Parameters of Grounding Systems", electrical continuity should be measured using specialized instruments with a resolution of 1mΩ and an accuracy no less than 1.0 grade. Our company has developed this instrument based on this standard, which is a highly automated portable tester specifically designed for testing the electrical integrity of grounding systems. All technical indicators of this instrument meet or exceed the relevant standard requirements. The instrument is simple and convenient to operate, features high precision, fast testing speed, good repeatability, and intuitive readings. It is an ideal dedicated instrument that meets regulatory requirements, greatly facilitating the conduct of test projects and improving work efficiency.

(1) Power Supply Technology: Utilizes the latest power supply technology, capable of outputting a 10A current and supporting long-term continuous operation. It overcomes the drawbacks of instantaneous current in pulse power supplies, effectively breaking through the oxide film on contacts to achieve excellent test results.

(2) Strong Anti-interference Capability: Under severe interference conditions, the last digit on the LCD screen can remain stable within ±1 digit range, ensuring stable readings and good repeatability.

(3) Long Service Life: Employs high-precision resistors throughout, effectively eliminating the impact of environmental temperature on measurement results. Additionally, the use of military-grade connectors enhances vibration resistance.

(4) Simple Operation: Simply press the measurement button to obtain the measurement result. The results are displayed using LED, providing intuitive readings with good repeatability.

(5) Portable Design: Features a portable design with compact size and light weight. The panel and chassis are integrated into a single structure, offering excellent shock resistance.

1. Measurement Range: 1～1999mΩ
2. Resolution: 1mΩ
3. Test Current: DC 1A, 2A, 5A, 10A (four fixed current levels)
4. Measurement Accuracy: ±(0.5%+2 digits)
5. Measurement Radius: 50 meters
6. Display Method: LED display
7. Operating Mode: Continuous
8. Power Supply: AC220V±10%, 50Hz
9. Operating Environment: Temperature -10℃～40℃, Humidity ≤80% RH
10. Dimensions: 300×270×200 mm³
11. Weight: 5kg (excluding accessories)