Hioki FT6041 4-Pole Earth Tester

Hioki FT6041 Earth Tester

The FT6041 is Hioki's flagship earth tester for professional earthing system installation and maintenance. Designed for field use in all weather conditions, it is IP67 rated — fully dust tight and waterproof to 1 metre — and survives being dropped from 1 metre onto concrete. The 6-second measurement time and non-tangling cord reel system dramatically reduce the time required to complete multi-point earth resistance surveys.

Key Features

• 4-pole, 3-pole and 2-pole earth resistance measurement
• Soil resistivity measurement (Wenner 4-pole method)
• Low-resistance measurement (4-terminal and 2-terminal)
• Ground potential measurement (0 to 30V RMS)
• MEC (Measuring Earth with a Clamp) function — measure ground resistance without disconnecting electrodes
• 2-clamp method for grounded systems without driving stakes
• Note: MEC and 2-clamp measurement require the optional FT9847 signal induction clamp and CT9848 clamp-on sensor, not included with this base unit — see the FT6041-91 for the complete set with clamps included
• 6-second measurement time — fastest in its class
• 100 kΩ allowable auxiliary resistance — single stake insertion
• IP67 dust and waterproof, 1m drop proof
• -25°C to 65°C operating temperature range
• Bluetooth wireless via Z3210 for data management
• CAT IV 100V / CAT III 150V / CAT II 300V

Applications

Earthing system installation and verification, lightning protection earth testing, substation earth grid testing, telecom tower earthing, solar PV plant earthing verification and any application requiring reliable earth resistance measurement in the field. The 2-clamp method allows testing of each electrode in a multiple earthing system without disconnecting them (requires the optional FT9847/CT9848 clamps).

Why Earth Testing Matters

Indian electrical regulations (IS 3043) require earth electrode resistance to be below specified values depending on the application. Regular earth resistance testing is mandatory for lightning protection systems, substation earths and industrial plant safety earths. An earth resistance that has drifted high due to soil drying, corrosion or poor installation is a serious safety risk.