Megger DLRO100HB Digital Low-Resistance Ohmmeter

Overview

The DLRO100 series of digital low resistance micro-ohmmeters are portable, lightweight instruments that deliver 100 A test current. With integrated rechargeable Li-ion batteries providing power for up to 200 manual or automatic tests per charge, these instruments enable high current low resistance testing in remote locations without access to mains power. Novel circuitry provides high noise immunity and stable readings, while rugged enclosures maintain IP54 ingress protection even during testing.

Operator safety is ensured through CAT IV 600 V rating per IEC 61010, and optional DualGround operation enhances safety in substations and similar environments. Wide measurement capability from 0.1 µΩ to 1.999 Ω, combined with smooth DC output and adjustable test parameters, makes these instruments suitable for diverse applications from cable testing to circuit breaker verification.

Key Features

• 100 A adjustable output (10–100 A)
• 0.1 µΩ to 1.999 Ω measurement range with 0.1 µΩ resolution
• Accuracy of ±0.05 µΩ (0.1–10 µΩ) or ±0.2% (10 µΩ–2 Ω)
• Integrated rechargeable Li-ion battery with 360 single tests or 30 minutes continuous operation at 100 A
• Battery and mains powered operation
• DualGround support for safe testing in substations
• CAT IV 600 V safety rating per IEC 61010
• IP67 rating (lid closed), IP54 rating (lid open during battery operation)
• Low ripple DC output
• USB download and internal memory for up to 999 time/date stamped readings
• Adjustable current ramp rates and test duration
• 4-terminal measurement capability
• Large, clear LCD display

Applications

• Checking resistance of busbar and cable joints
• Measuring wire and cable resistance
• Verifying lightning conductor bonding
• Testing switchgear and circuit breakers during manufacture and in the field
• Circuit breaker testing requiring smooth DC output

Included Accessories

• Line cord
• Quick start guide
• Certificate of test
• Calibration certificate
• Information CD