Megger DLRO100 digital low-resistance ohmmeter

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The Megger DLRO100 digital low-resistance ohmmeter is a readily portable lightweight instrument that can deliver a test current of 100 A. It has internal rechargeable Li-ion batteries that provide power for up to 200 tests on a single charge. This allows users to perform high-current low-resistance testing in almost any location, even if there is no access to a mains supply.

The instrument uses novel circuitry that gives high noise immunity and provides stable readings. For physical protection it features enclosures with an IP54 ingress protection rating, even when the lid is open and testing is in progress.

Operator safety is protected by a CAT IV 600 V safety rating in line with IEC61010. With an optional DC clamp, dual-ground operation is also supported. This provides safety when working in substations and similar environments by allowing tests to be carried out with both sides of the equipment under test grounded.

The product has capacity to check the resistance of busbar and cable joints, measure wire and cable resistance, and verify lightning conductor bonding. It is also suitable for testing switchgear and circuit breakers during manufacture and in the field. Additionally, it offers a smooth DC output for circuit breaker tests.

The product has a measuring range of 0.1 µΩ to 1.999 Ω with a resolution of 0.1 µΩ. Results are shown on a large LCD display panel and can also be stored in a large-capacity internal memory for later access via the display or USB download. Versions are available with support for remote operation, Bluetooth connectivity and asset/result tagging.

Manual mode allows the user to initiate the test once the probes are in contact with the object. In auto mode, as soon as the potential leads are connected, the test starts automatically.

In continuous mode, the instrument will continue to test, updating the display after each new test cycle, until the test button is pressed again.

Both standard and Kelvin lead sets are available. They are 5, 10 or 15 m in length. All have a CAT IV 600 V rating.