Megger
DLRO600 Ducter Digital Low Resistance Ohmmeter - 600A

Megger DLRO600 Digital Microhmmeter

• High-current, low-resistance testing made simple

Accurate Testing from 0.1 µΩ to 1 Ω at up to 600 Amps

The Megger DLRO600 is a powerful and dependable digital microhmmeter for accurately measuring very low resistances. It provides test currents from 10 amps up to 600 amps DC, making it ideal for applications such as testing circuit breaker contacts, switchgear, busbar joints and welded connections.

All parameters and measurement results are displayed clearly on the large backlit LCD screen, so you can view setup and readings at a glance. Compact and portable at under 15 kg, the DLRO600 is suitable for use in the field, on the production floor or in a workshop environment.

Key Features

• Test current range from 10 A to 600 A DC
• Measures from 0.1 µΩ to 1 Ω with 0.1 µΩ resolution
• RS232 port to download stored results or for real time output to a printer
• Stores up to 300 test results and notes in on-board memory
• Displays all test parameters, results and settings on one clear screen
• Compact and rugged design for field or workshop use
• Four-terminal Kelvin connection eliminates lead resistance
• Supplied with 5 m current and potential leads, software and download cable

Easy to Use and Reliable

The Megger DLRO600 automatically compensates for load resistance and supply voltage variations, giving consistent and stable readings. Test modes are selected directly from the menu, and results can be stored automatically or downloaded later. Pass/fail limits can be set to help identify acceptable readings quickly.

Test Modes

• Normal mode: Performs one measurement with automatic current ramp-up and ramp-down.
• Auto mode: Designed for repetitive testing such as busbar joints; each time the potential leads touch the sample, a new test starts automatically.
• Continuous mode: Monitors resistance over time, taking readings every two seconds until stopped.

Technical Overview

Typical Applications

• Circuit breaker and isolator contact resistance testing
• Busbar and cable joint integrity checks
• Transformer winding and welded connection testing
• Switchgear and power distribution maintenance
• Electrical commissioning and quality control

The Ducter Heritage

For more than a century, Megger’s “Ducter” instruments have set the benchmark for low-resistance measurement. The Megger DLRO600 continues this tradition with modern design, digital control and data management features. Built for accuracy, safety and durability, it provides trusted performance for professionals across the electrical testing industry.

❓ Frequently Asked Questions (FAQ)

Q1: How is the DLRO600 different from smaller DLRO models?

A. The Megger DLRO600 delivers up to 600 amps of test current, allowing accurate measurement of large conductors, switchgear and busbars where smaller instruments cannot provide sufficient current.

Q2: Can the Megger DLRO600 be used in the field?

A. Yes. Despite its high power capability, the unit is compact, weighing under 15 kg, and designed for rugged site work as well as laboratory and production use.

Q3: How many test results can be stored?

A. The on-board memory can hold up to 300 test results and notes, which can later be viewed on the instrument or downloaded via the RS232 port.

Q4: What safety systems are built in?

A. The DLRO600 includes automatic ground detection, external voltage sensing, over-temperature protection and discharge monitoring for maximum operator safety.

Q5: Does the instrument adjust for load or lead resistance?

A. Yes. The four-terminal measurement method cancels lead resistance, and the instrument automatically adjusts for load resistance and supply voltage variations to maintain stable output current.