Fluke FLUKE-1625-2 GEO Earth Ground Tester

Overview

The Fluke FLUKE-1625-2 GEO is an advanced earth ground resistance tester designed for demanding field applications where accuracy and efficiency are critical. This tester combines all four standard earth ground measurement methods with proprietary advanced features including Automatic Frequency Control (AFC) for interference suppression and R* impedance measurement for precise fault-to-ground assessment. The 1625-2 is ideal for electrical contractors, utility maintenance, and testing professionals who require sophisticated grounding system diagnostics.

Key Features

• 3- and 4-pole Fall-of-Potential testing — standard method using ground stakes
• Selective testing — measure individual ground rods using one clamp without system disconnection
• Stakeless testing — measure ground loop resistance using only two clamps for sites without soil access
• 4-pole soil resistivity testing for characterization
• Automatic Frequency Control (AFC) — identifies existing interference and selects optimal measurement frequency for accurate readings
• R* measurement — calculates earth ground impedance at 55 Hz to reflect actual fault-to-ground resistance conditions
• Adjustable limits for faster testing cycles
• IP56 rated for outdoor use in all weather
• USB data storage and transfer for documentation
• Battery level status indicator

Applications

• High-accuracy grounding system commissioning and acceptance testing
• Periodic compliance and safety verification on critical systems
• Troubleshooting ground faults in complex installations
• Soil resistivity assessment for design and site planning
• Utility and industrial facility grounding optimization
• Electrical safety testing in contaminated or difficult-access environments