Description

Megger DLRO200 Digital Low Resistance Ohmmeter

The Megger DLRO200 is a high-precision digital low resistance ohmmeter designed for accurate testing of electrical connections, busbars, bonds, and switchgear contacts. Built for field and workshop use, it delivers reliable low-resistance measurements from 1 µΩ to 200 Ω, making it ideal for critical applications in power generation, distribution, and industrial maintenance.

Equipped with a robust, handheld design and intuitive interface, the DLRO200 simplifies the process of identifying loose connections, corroded joints, or deteriorated contacts that can cause overheating or equipment failure. Its advanced features include multiple test modes, automatic current reversal to eliminate thermal EMF errors, and memory storage for later analysis.

With the Megger DLRO200, engineers and technicians can perform rapid, accurate, and repeatable measurements, ensuring compliance with international standards. Lightweight, portable, and durable, it is an essential tool for preventive maintenance, commissioning, and troubleshooting in electrical systems.

Specifications:

Measurement

• Resistance measurement range: 0.1 µΩ – 999.9 mΩ (depending on supply voltage & test leads)

• Best resolution: 0.1 µΩ

• 4-terminal technique to eliminate test lead resistance from measurements

Accuracy

• Voltage: ±0.5 % ±0.1 mV

• Current: ±0.5 % ±0.1 A

• Resistance:
  • Better than ±1 % from 300 µΩ – 100 mΩ
  • Better than ±2 % from 100 µΩ – 300 µΩ

Test Current

• DC test current: 10 A – 200 A (depending on load & supply voltage)

• Current accuracy: ±2 % ±2 A

Test Modes & Timing

• Test modes: Manual, Auto, Continuous

• Normal/Auto test duration: ~10 seconds

• Continuous mode: updates every ~2 seconds

Memory & Communication

• Internal memory: up to 300 test results + memo (160 characters)

• Communication port: RS232 for data download or real-time output

Display & Interface

• Display: High-resolution backlit LCD

• Indicators: LED for test current + on-screen messages

Other Features

• Supply voltage: 100 – 265 V AC, 50/60 Hz

• Voltmeter input impedance: >200 kΩ

• Hum rejection: 5 V rms (50/60 Hz)

• Operating environment: –10 °C to +50 °C

• Max humidity: 95 % RH non-condensing

• Max altitude: 2000 m

Physical

• Dimensions: ~410 × 250 × 270 mm

• Weight: ~14.5 kg (without test leads)

Standards & Safety

• Safety standards: IEC 61010‑1

• EMC compliance: IEC 61326‑1