The Megger DLRO10HD suits rail bonding crews, wind turbine and aircraft lightning-protection checks, busbar and cable joint inspections, and repetitive production-line testing. What sets it apart is the choice of output power. The low-power ranges (below 0.25 W) show contamination and corrosion that a high current would push through and hide. The high-power ranges (2.5 W at 1 A and 25 W at 10 A) heat weak points such as rough contact surfaces or frayed strands, so the reading changes and shows the problem. Each test can run for up to 60 seconds, and Megger says the 25 W output can be held for at least 60 seconds.

Test current accuracy ±10%
Voltmeter input impedance >200 kΩ
Maximum lead resistance at 10 A <100 mΩ 100 µA:0–2.5 kΩ / 0.1 Ω / ±0.2% ±200 mΩ / 25 mV / 25 µW 100 µA:0–250 Ω / 0.01 Ω / ±0.2% ±20 mΩ / 25 mV / 2.5 µW 1 mA: 0–25 Ω / 1 mΩ / ±0.2% ±2 mΩ / 25 mV / 25 µW 10 mA: 0–2.5 Ω / 0.1 mΩ / ±0.2% ±200 µΩ / 25 mV / 250 µW 100 mA: 0–250 mΩ / 0.01 mΩ / ±0.2% ±20 µΩ / 25 mV / 2.5 mW