Low Resistance Ohmmeters

Low resistance ohmmeters are precision instruments designed to measure extremely small resistances in the micro-ohm range. Also called micro-ohmmeters or ductor testers, these devices are essential for verifying the integrity of high-current electrical connections. By applying a known test current and measuring the voltage drop, low resistance ohmmeters detect weaknesses that could compromise safety or efficiency.

Why Test for Low Resistance?

In high-current systems, even a minor increase in resistance can lead to excessive heating, energy losses, or failure. Low resistance testing identifies poor contacts, loose joints, or deteriorating connections before they cause costly downtime or equipment damage. It is a critical part of preventive maintenance in utilities, industry, and transport.

Applications

• Utilities: Switchgear, transformers, and substation maintenance.
• Industrial facilities: Busbars, generators, motors, and heavy equipment testing.
• Rail and transport: High-current circuits in rolling stock and infrastructure.
• Contractors: Commissioning new installations and verifying safety compliance.

Types of Low Resistance Ohmmeters

• 10A portable units: Compact testers for everyday field use, ideal for contractors and technicians.
• High current testers (200A+): Advanced instruments for heavy-duty testing in utilities and industry.

Popular Brands & Alternatives

Many professionals are familiar with the Megger DLRO range of ductor testers. However, AEMC low resistance ohmmeters such as the 6240, 6255, and high-current 6292 provide reliable, rugged alternatives with proven accuracy and excellent support in Australia.

Explore the full Micro-Ohmmeters category to compare 10A models with High Current Micro-Ohmmeters designed for critical infrastructure applications.