The Megger DLRO-10X Digital Microhmmeter is a four-terminal instrument designed for precise low-resistance measurement across industrial and laboratory environments. It delivers accurate results in under three seconds using single-cycle reversing DC ratiometric measurement with lead resistance cancellation. The instrument supports multiple measurement modes—manual, auto, continuous, inductive, unidirectional, and normal—enabling adaptation to diverse test requirements. Auto mode automatically selects test current up to 10 A DC and displays the average of forward and reverse measurements; manual mode permits user-defined current selection via menu interface.
Technical Specifications
Measurement Range & Accuracy
• Resistance range: 0.1 µΩ to 2000 Ω across seven ranges
• Basic accuracy: ±0.2%
• Test current accuracy: ±10%
• Test current stability: <10 ppm/s
• Maximum output current: 10 A DC
• Power limit: 250 mW (optional override available)
• Hum rejection: <1% ±20 digits additional error with 100 mV peak 50/60 Hz on potential leads
Measurement Modes
• Auto mode with forward/reverse averaging
• Manual current selection
• Continuous measurement mode
• Inductive charging mode
• Unidirectional mode for faster single-direction measurement
• Normal mode for standard test initiation
Data & Interface
• On-board storage: 700 test results
• Memo field: Up to 200 characters per test via alphanumeric keypad
• RS232 interface for real-time or stored data download
• Large backlit LCD display
Safety & Protection
• Fuse protection rated to 600 V
• External voltage protection: Up to 600 V DC between any terminal pair for 10 seconds
• High voltage warning indicator
• Current flow warning indicator
– Key Features
• Four-terminal measurement eliminates lead resistance error
• Flexible current control: automatic optimization or manual selection
• Results in under three seconds
• Portable design: 2.6 kg, 220 × 100 × 237 mm dimensions
• Substantial data logging capacity with field annotation capability
• Built-in safeguards against external voltage transients
– Typical Applications
Contact resistance measurement, transformer winding assessment, busbar integrity testing, bond/weld verification, and routine electrical maintenance across field and benchtop installations.
– Compatibility & Integration
RS232 connectivity enables direct data transfer to host systems during measurement or post-test download from internal memory.
