Low resistance testing

Ensure Electrical Integrity with Precision Micro-Ohmmeters and Continuity Testers

Low resistance testing is essential in substations to ensure the safety and reliability of critical connections. By measuring resistance in conductors, joints, and grounding points, engineers can detect faults before they cause overheating, energy loss, or equipment failure. Megger offers a range of rugged, high-precision instruments—including the DLRO10, DLRO10X, MOM3, and DLRO2X—designed for fast, accurate testing in demanding environments. Paired with CertSuite software, these tools streamline data management and reporting, supporting effective maintenance, compliance, and asset performance.

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Unmatched Accuracy and Reliability in Harsh Environments

Megger low resistance testers are engineered to deliver precise, repeatable results even in the electrically noisy and rugged conditions of substations. With advanced features like current reversal to eliminate thermal EMF errors, dual-channel temperature compensation, and high test currents up to 220 A, engineers can trust the results every time—no matter the complexity of the site

Tailored for Field Use with Intuitive Design

Designed with the working engineer in mind, Megger’s testers are lightweight, portable, and easy to operate. From the handheld MOM3 for fast, high-current testing to the DLRO10X with onboard data logging, these instruments combine speed and simplicity with professional-grade performance, making them ideal for both commissioning and routine maintenance tasks

Integrated Data Management with CertSuite Software

Megger’s testing ecosystem extends beyond the hardware. With CertSuite Asset software, engineers can seamlessly capture, organize, and report test data in real time—ensuring compliance with industry standards and improving the efficiency of asset management workflows across large substations or entire networks

Comprehensive Product Range to Suit Every Application

Whether you're conducting quick spot checks in the field or performing detailed diagnostics as part of a large-scale maintenance program, Megger offers a low resistance tester to match your needs. From compact handheld models for fast circuit breaker testing to advanced digital instruments with data logging and automation features, the range covers every scenario a substation engineer might encounter—making Megger a one-stop solution for continuity and micro-ohm testing.

Frequently asked questions

What is low resistance testing and why is it important in substations?

Low resistance testing (also known as continuity testing) measures the integrity of electrical connections, helping to identify issues like corrosion, loose joints, or contact degradation. It’s crucial in substations where high-current pathways must remain efficient and safe to prevent energy loss, overheating, or equipment failure.

What are the key differences between the DLRO10, DLRO2X, and MOM3 models?

Your choice depends on the type of equipment you're testing and the level of mobility or features you need. Each model serves a specific purpose:

DLRO10/DLRO10X: These micro-ohmmeters are ideal for accurate, low-resistance measurements with test currents up to 10 A. The DLRO10X includes onboard data storage and downloading for asset tracking and documentation.
DLRO2X: A compact, field-ready instrument offering dual temperature inputs, barcode scanning, and an intuitive interface—perfect for routine testing with traceability and consistency.
MOM3: Built for high-current applications (up to 220 A), the MOM3 is optimized for quick, reliable testing of circuit breaker contacts and busbar joints in the field.
DLRO100 Series: Designed for demanding applications, the DLRO100 series offers 100 A test currents in a portable, battery-powered unit. It features a CAT IV 600 V safety rating, ensuring safe operation even in challenging environments. This series is ideal for testing large or high-resistance components where higher test currents are necessary.

Are Megger’s low resistance testers suitable for field conditions in substations?

Definitely. These instruments are built to withstand the harsh environments common in substations, with rugged enclosures, long battery life, and features like current reversal to cancel thermal EMFs. They're reliable even in high-interference conditions.

Can I store and manage test results for compliance and reporting?

Yes. The DLRO10X and DLRO2X include onboard memory for test data. When paired with CertSuite Asset software, you can seamlessly organize, store, and report results from the field—helping with regulatory compliance, asset lifecycle tracking, and predictive maintenance programs.