NDDT-5A Grounding Down Conductor Continuity Tester

Product Introduction

       The electrical integrity of a grounding device refers to the electrical connectivity between various electrical equipment that should be grounded within the grounding device, as well as between different parts of the grounding device and the equipment, specifically the DC resistance value, also known as electrical conductivity. The reliable and effective connection between the ground down conductor of electrical equipment and the ground grid is fundamental to ensuring the safe operation of the equipment. The ground down conductor is the part that connects the electrical equipment to the ground grid. During long-term operation, the connection point may be affected by factors such as moisture, leading to corrosion or even breakage, resulting in increased resistance at the connection point between the ground down conductor and the main ground grid. This may fail to meet the requirements of electrical regulations, posing safety risks during operation, and in severe cases, causing the equipment to operate without proper grounding. The underground grounding electrodes and their connections of the grounding device may also suffer from corrosion or breakage. Therefore, it is necessary to conduct regular electrical integrity tests on grounding devices.

       The power industry standard DL/T475-2006 "Guidelines for Measuring Characteristic Parameters of Grounding Devices" stipulates that electrical conductivity should be measured using specialized instruments with a resolution of 1mΩ and an accuracy of no less than 1.0 grade. Developed in accordance with this standard, our company's instrument is a highly automated portable tester specifically designed for electrical integrity testing of grounding devices. Its technical indicators meet or exceed the requirements of relevant standards. The instrument is easy to operate, highly accurate, fast in testing, reproducible, and provides intuitive readings, making it an ideal specialized instrument that complies with regulatory requirements. It greatly facilitates the implementation of test projects and improves work efficiency.

Product Features

☆、Power technology: Utilizes advanced power technology to output a 10A current, enabling long-term continuous operation. It overcomes the drawbacks of pulsed power supplies with instantaneous currents, effectively breaking through the oxide film on contacts to achieve accurate test results.

☆、Strong anti-interference capability: Under severe interference conditions, the last digit of the LCD display remains stable within ±1 digit, ensuring stable and reproducible readings.

☆、Long service life: Uses high-precision resistors throughout, effectively eliminating the impact of environmental temperature on measurement results. The use of connectors enhances vibration resistance.

☆、Simple operation: Simply press the measurement button to obtain results. Measurements are displayed via LED, providing intuitive and reproducible readings.

☆、Portable design: Compact and lightweight with an integrated panel and chassis structure, offering excellent shock resistance.

Technical Parameters

☆、Measurement range: 1～1999mΩ
☆、Resolution: 1mΩ
☆、Test current: DC 1A, 2A, 5A (three fixed current ranges)
☆、Measurement accuracy: ±(0.5% + 2d)
☆、Measurement radius: 50 meters
☆、Display method: 3½ LED display
☆、Operation mode: Continuous
☆、Power supply: AC220V±10% 50Hz
☆、Operating environment: Temperature -10℃～40℃, Humidity: ≤80% RH
☆、Dimensions: 300×270×200 mm³
☆、Weight: 5kg (excluding accessories)