Megger
DLRO10 Low Resistance Ohmmeter with DH4-C

Megger DLRO10 DUCTER 10A Micro-Ohmmeter

Megger DLRO10 10 A Tester is small, lightweight and portable, designed for ground-bond testing, routine maintenance and corroboration of protection systems to prevent long-term damage to equipment. Megger DLRO10 provides accurate resistance readings in under 3 seconds using a proven four-terminal method that reveals the true resistance of the item under test (IUT) and avoids lead/contact error.

Each instrument automatically applies forward and reverse currents to the test sample, cancelling out standing voltages, and checks for undue noise during measurement. This improves confidence in every result and helps technicians measure resistance correctly first time. Compact enough to be worn around the neck in the field, Megger DLRO10 is equally at home in workshops and on production lines where fast, repeatable low-ohm testing is essential.

Megger DLRO10 is perfect for:

• Utilities (including wind turbines — see KC series test leads data sheet)
• Chemical plants
• Refineries
• Mines
• Railroads
• Telecommunication companies
• Automotive manufacturers
• Any site using UPS battery back-up systems

Across these sectors, Megger DLRO10 streamlines acceptance testing, periodic inspection and troubleshooting by delivering fast, dependable resistance readings on joints, bonds and contacts that dictate system safety and performance.

▶ See how this DLRO fits in to the Megger low-resistance lineup:

Watch how the Megger DLRO10 fits into the DLRO series, offering straightforward, portable, and accurate low-resistance testing for a variety of electrical and industrial applications.

Megger DLRO10 Key Features:

• NEW interchangeable test lead terminations for on-the-spot flexibility
• Auto current reversal cancels standing EMFs for correct averages
• Protected to 600 V for peace of mind on complex sites
• Auto-detects continuity in potential and current connections
• Multiple operating modes including fully automatic and continuous
• Usable in tight spaces; reduces need for extra-long leads and two-person operation
• Four-terminal method shows the true resistance of the item under test
• Bright, easy-to-read displays minimise human error
• Noise checks during measurement reduce the risk of incorrect results
• Auto detection in P and C circuits prevents erroneously high readings
• Battery module with state indicator to verify spares off-instrument

New Duplex-Connect test leads are now supplied as standard (see images or data sheet). With Megger DLRO10 and Duplex-Connect you can swap terminations quickly, lock caps for safety and add extensions to reach awkward points efficiently.

Megger DLRO10 Applications:

The need to measure resistance at very low values is both common and critical. From goods-receiving checks to ground bonding and weld quality, Megger DLRO10 helps spot small increases that precede major failures. Typical d.c. measurements include:

• Switch and contact breaker resistance
• Busbar and cable joints
• Aircraft frame bonds and static control circuits
• Integrity of welded joints
• Inter-cell connections on battery systems up to 600 V peak
• Quality control of resistive components
• Transformer and motor winding resistance
• Rail and pipe bonds
• Metal alloys, welds and fuse resistance
• Graphite electrodes and composite materials
• Wire and cable resistance
• Transmitter aerial and lightning-conductor bonding

In each case, Megger DLRO10 provides stable resistance readings you can trend over time to plan maintenance and avoid unplanned outages.

What comes with the Megger DLRO10?

• (1006-598) Megger DLRO10 10 A Low Resistance Ohmmeter
• (6121-492) 7 Ah NiMH Battery Module
• (1006-444) DH4 Duplex Handspikes (2×), one with indicator lights (1.2 m)
• (6280-333) Battery Charger (115/230 V 50/60 Hz supply)
• (6280-332) Cigar-lighter adapter for battery charging
• User guide
• Warranty book

This kit means your Megger DLRO10 is ready to go for first power-up and immediate commissioning tests.

Specifications & Performance at a Glance

Megger DLRO10 selects the optimum test current up to 10 A d.c. and measures from 0.1 μΩ to 2000 Ω across seven ranges, typically delivering an averaged result within 3 seconds with 0.2% basic accuracy. The four-wire technique, forward/reverse averaging and robust noise rejection are engineered for reliable results on every test sample. Details are taken from the official DLRO10/DLRO10X data sheet.

Designed for field work, the instrument is compact and can be worn around the neck to keep hands free for safe probing. Its duplex handspikes help you achieve firm Kelvin contact quickly, allowing you to measure resistance repeatedly with confidence in demanding environments.

Using Megger DLRO10 for Best Results

For fast, accurate measurements:

1. Prepare the surface and ensure clean contact points; poor contact raises uncertainty.
2. Use duplex handspikes or Kelvin clips appropriate to the geometry and current level.
3. Let Megger DLRO10 auto-select current or manually choose a current to suit the conductor size and heating risk.
4. Allow forward and reverse cycles to complete so standing voltages cancel and the mean value is displayed.
5. Record and trend values: a small drift in resistance readings often signals loosened joints or corrosion.

Thanks to its portability and protective design, Megger DLRO10 is ideal for switchgear checks, battery interlink verification and production QA where you must measure resistance accurately and repeatably.

What is Low Resistance?

It’s a measurement below 1.000 Ω. At this level it is vital to use equipment that minimises errors from test-lead and contact resistance between probe and material. Standing voltages across the item under test (for example, thermal EMFs at dissimilar-metal junctions) can also distort results.

To compensate, a four-terminal method is used with a reversible test current and a Kelvin-bridge style meter. Low-resistance ohmmeters like Megger DLRO10 are purpose-built for these applications, delivering confidence in every test sample even when access is tight.

Why Measure Low Resistance?

Technicians periodically test low resistance to prevent long-term damage and to reduce energy wasted as heat. These measurements reveal constraints in current flow that may curtail machine output or delay protective-device operation under fault. Unexpected changes in measured values - and the trending of this data - help forecast failures so you can act before a minor issue becomes a major outage. With Megger DLRO10 you get the repeatability required to set reliable thresholds and act decisively.

❓ Frequently Asked Questions (FAQ)

Q1: How does Megger DLRO10 cancel thermal EMFs?

A. Megger DLRO10 applies forward and reverse currents, then averages the two measurements. This cancels standing voltages across the test sample and yields a truer low-ohm value.

Q2: Can Megger DLRO10 be used on battery strings?

A. Yes. Megger DLRO10 supports inter-cell connection checks on systems up to 600 V peak when used with the correct leads and procedures, helping you measure resistance safely on live sites.

Q3: What operating modes are available?

A. Megger DLRO10 provides Manual, Auto, Continuous and Inductive modes to suit everything from rapid production checks to stabilised readings on coils and windings.

Q4: Is it comfortable for field work?

A. Absolutely. The instrument is compact, rugged and can be worn around the neck with a strap so both hands are free for probes, making repetitive resistance readings quicker and safer.

Why choose Megger DLRO10?

If you need a dependable low-ohm tester that you can take anywhere and trust with critical joints, Megger DLRO10 is the straightforward choice. It’s engineered to measure resistance fast, store and share results (when used with DLRO10X accessories), and keep teams productive across utilities, transport and manufacturing. Choose Megger DLRO10 to protect assets, verify work quality and keep your operation running at full capacity.