Megger DLRO100HB 100 A Digital Low Resistance Ohmmeter with SCHUKO Plug (1004-954)

Measuring very low resistances with high accuracy is a challenge for standard multimeters, especially in demanding field conditions. The Megger DLRO100HB solves this by delivering a robust, portable solution for precise low-resistance measurements up to 100 A, ensuring reliable results for critical electrical connections.

Who is it for

This instrument is built for electrical engineers, maintenance technicians, and power utility professionals who need to verify the integrity of circuit breakers, busbars, transformers, and other high-current joints. Its rugged design and battery operation make it ideal for both workshop and field use.

Main features

• High test current of 100 A DC for accurate low-resistance measurements
• Wide measurement range from 0.1 µΩ to 2000 mΩ with 0.1 µΩ resolution
• Basic accuracy of ±0.2% of reading ±0.2 µΩ
• Four-terminal Kelvin measurement principle eliminates lead resistance errors
• Multiple test modes: continuous, auto, manual, inductive, unidirectional, and bidirectional
• High-brightness LCD display for clear readings in any lighting
• Powered by rechargeable Li-ion battery or mains supply (100-264 V AC)
• Battery life up to 1000 tests at 10 A or 200 tests at 100 A
• Internal storage for up to 2000 test results with USB connectivity for data transfer and remote control
• Advanced noise rejection for stable measurements in electrically noisy environments

Specifications

• Maximum test current: 100 A DC
• Resistance range: 0.1 µΩ to 2000 mΩ (2 Ω)
• Resolution: 0.1 µΩ
• Accuracy: ±0.2% of reading ±0.2 µΩ
• Measurement principle: Four-terminal (Kelvin)
• Display: High-brightness LCD
• Power source: Rechargeable Li-ion battery or 100-264 V AC mains
• Battery life: Up to 1000 tests at 10 A, 200 tests at 100 A
• Safety rating: CAT IV 600 V (to earth), CAT III 300 V (phase to phase)
• Data storage: Up to 2000 test results
• Connectivity: USB
• IP rating: IP54 (case closed), IP53 (case open)
• Operating temperature: -20°C to +50°C
• Maximum output power: 1000 W
• Test duration: Up to 60 seconds at 100 A

Tips

For best accuracy, ensure the test leads are properly connected and the contact surfaces are clean. Use the bidirectional test mode to automatically average out thermal EMF effects. When measuring inductive loads, allow sufficient settling time before taking a reading.