NDHL-100A+ Loop Resistance Tester

Product Introduction

This instrument features an ergonomically designed operation panel that aligns with user habits. It utilizes high-frequency switching power supply and digital circuit technology, making it suitable for measuring the loop resistance of switch control equipment. The test current follows the national standard recommendation of DC 100A. It directly measures loop resistance under DC 100A conditions, with test results displayed on a large LCD screen. It includes functions such as data storage, output printing, and time setting, with an additional 50A range available for user selection. Custom test time can be set up to 599S, far exceeding the standard requirement of 60S. It is domestically recognized as a highly stable contact resistance tester with a resolution of 0.01μΩ, outperforming imported high-current micro-ohmmeters. It meets the requirements for on-site high-voltage switch maintenance in power and utility sectors, as well as loop resistance testing in high-voltage switch manufacturing.

Product Features

☆ High Current: Utilizes new power supply technology to output high current continuously for extended periods, overcoming the limitations of pulsed power supplies. Effectively breaks through the oxide film on switch contacts for accurate test results.
☆ High Stability: Under severe interference conditions, the last digit of the LCD display remains stable within ±1 count, ensuring reliable and repeatable readings.
☆ High Accuracy: Employs dual-channel high-speed 16-bit Σ-Δ AD sampling and advanced digital signal processing technology, achieving a resolution of 0.01μΩ. It is currently the most stable domestic contact resistance tester with such resolution, outperforming imported high-current micro-ohmmeters.
☆ Intelligent: Features an imported high-performance CPU that automatically switches ranges based on signal size to ensure accuracy. Includes over-temperature protection that automatically stops current output when the instrument exceeds the set temperature, ensuring safe operation.
☆ High Quality: Key components are imported, with a cleverly designed temperature compensation circuit that effectively eliminates environmental temperature effects on measurements. The use of connectors enhances vibration resistance.
☆ Powerful Functionality: Allows free selection of 50A or 100A current, with test time adjustable from 5s to 599s. Overcomes the limitations of similar instruments that lack adjustable measurement time or have short continuous operation periods, far surpassing the performance of comparable devices.
☆ User-Friendly Interface: Features rotary mouse input for quick and convenient data entry. Allows users to set the instrument date and time, save measurement data in real time, and print results instantly.
☆ USB Data Transfer: Transfers measurement data to a USB drive via USB interface, enabling further analysis and processing with supporting software.
☆ Easy to Use: Compact size, lightweight, and portable design.

Technical Parameters

☆ Measurement Range: 0～2999.9μΩ

☆ Resolution: 0~99.99: 0.01μΩ; 100.0~2999.9: 0.1μΩ

☆ Test Current: DC 50A, 100A fixed output

☆ Measurement Accuracy: 0.5%±1d

☆ Display: Large-screen Chinese LCD display

☆ Storage Method: USB transfer

☆ Power Supply: AC220V±10%  50Hz

☆ Operating Environment: Temperature -10℃～40℃, Humidity ≤80%RH

☆ Dimensions: 360 mm x 330 mm x 250 mm

☆ Weight: 8Kg (excluding accessories)