Micro-Ohmmeters

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Micro-ohmmeters and milliohmmeters for accurate measurement of very low electrical resistance, ideal for quality control, maintenance and industrial applications.

Precision instruments for measuring very low resistance

Milliohmmeters and micro-ohmmeters are electrical instruments designed to measure extremely low resistance values, from milliohms down to micro-ohms. These measurements are essential in high-current systems.

Low-resistance measurement for demanding applications

Also known as low-resistance meters, these instruments allow accurate evaluation of electrical connections in industrial, energy and laboratory environments.

Why measuring very low resistance is critical

Increased resistance in electrical joints can cause voltage drops, energy losses and overheating. Early detection improves system safety and reliability.

Four-wire Kelvin measurement method

The Kelvin method eliminates lead resistance and ensures accurate and repeatable measurements of very low resistance values.

Operating principle

Based on Ohm’s Law, the instrument applies a known test current and measures the resulting voltage drop to calculate true resistance.

Quality control and manufacturing applications

Used to verify bolted, crimped and welded connections during manufacturing and assembly processes.

Testing switches and power equipment

Contact resistance measurement helps identify wear, oxidation and mechanical defects in switches and circuit breakers.

Measurement of busbars and power links

Micro-ohmmeters are used to test busbars and high-current connections, preventing hot spots and power losses.

Testing motors and transformers

Low-resistance measurement allows comparison of windings and detection of internal faults or imbalances.

Earthing and continuity verification

These instruments are essential for checking electrical continuity in earthing systems and metallic structures.

Preventive maintenance

Gradual increases in resistance indicate deteriorating connections, allowing corrective action before failures occur.

Applications in energy and infrastructure

Widely used in power plants, substations and transport infrastructure to verify critical high-current connections.

Reliable measurements for critical systems

Milliohmmeters and micro-ohmmeters improve safety, efficiency and long-term reliability of electrical installations.

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