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Hioki is a leading manufacturer of electrical measuring instruments and test equipment, providing precision solutions for power analysis, battery testing and industrial maintenance. Its portfolio includes digital multimeters, clamp meters, power analysers, battery testers, data loggers and insulation testers. Trusted by engineers, electricians and researchers worldwide, Hioki products support applications in energy, automotive, electronics manufacturing and electrical maintenance.
Earth Tester for 2-Pole and 3-Pole Measurement
Earth tester for 2-pole and 3-pole earth resistance measurement, automatic interference voltage and auxiliary earth resistance check, IP67 dustproof and waterproof protection, optional Bluetooth communication.
• 2-pole and 3-pole earth resistance measurement
• Automatic interference voltage and auxiliary earth resistance check
• IP67 dustproof and waterproof
• Optional Bluetooth communication
• Grounding system inspection in electrical installations
• Verification of existing earth electrodes during maintenance and periodic testing
• On-site earth resistance testing in outdoor environments
The HIOKI FT6031-50 is an earth tester for electrical professionals working in service, maintenance, and inspection. It supports 3-pole measurement for precise earth resistance testing as well as a simplified 2-pole method using an existing reference earth when a full setup with auxiliary earth spikes is not possible. Optional Bluetooth communication can be added.
The 3-pole method is used to check the earth resistance of an existing earth electrode in buildings and electrical installations. For this measurement, the earth electrode under test is disconnected from the installation and measured together with two auxiliary earth spikes. The required test leads and auxiliary earth spikes are included with the FT6031-50 and are dimensioned for the typical setup with 10 m and 20 m lead lengths.
Measurement is performed at 128 Hz ±2 Hz, with an output voltage of 30 V rms or less and a measurement current of 25 mA rms or less. A measurement typically takes up to 6 s, including the automatic check of interference voltage and auxiliary earth resistance.
The 2-pole method provides a simplified earth resistance measurement when a full 3-pole setup with two auxiliary earth spikes is not possible or practical. In this case, an existing low-resistance earth is used as a reference, typically the neutral side of a grounded power supply. The measured value therefore includes not only the resistance of the earth electrode under test, but the sum of the test earth and the reference earth.
The measurement current is limited to 4 mA rms or less, so under suitable installation conditions a residual current device will typically not trip. The 2-pole method is therefore intended for simplified checks rather than the most precise measurement of a single earth electrode.
The FT6031-50 supports earth resistance measurement with automatic pre-checks, lead compensation, and threshold evaluation. Before the actual measurement starts, the instrument automatically checks interference voltage, meaning any voltage already present on the earth electrode, as well as the resistance of the auxiliary earth spikes.
The zero-adjustment function compensates for the influence of test lead resistance. The comparator function allows direct PASS/FAIL evaluation against a preset threshold. A continuous measurement mode is also available so that changes in the reading can be observed directly while positioning or repositioning the auxiliary earth spikes.
Optional longer test leads such as the L9843-51 and L9843-52 are available for setups with greater distances. On concrete or other hard surfaces where auxiliary earth spikes cannot be inserted directly, 9050 Earth Nets or L9846 Earth Nets Modules can be used. The earth nets modules can be clicked onto the supplied L9842-11 and L9842-22 lead reels, as well as the separately available L9845-31, L9845-33, and L9845-52 lead reels, forming a single unit with them.
Optional Bluetooth communication can be added to the FT6031-50 with the Z3210 Bluetooth Adapter. Measured values can then be transferred wirelessly to Windows, iOS, or Android devices. For smartphones and tablets, the free GENNECT Cross app is available for displaying, storing, and documenting readings.
Alternatively, the Z3210 can operate in HID mode, where measured values are sent to the active application as keyboard input. This allows direct data entry into Excel, text applications, or custom software applications.
Like all HIOKI earth testers, the FT6031-50 was developed in Japan and is manufactured at HIOKI’s own production facilities in Japan.
• FT6031-50 Earth Tester
• L9840 Auxiliary Earth Spikes
• L9841 Test Lead, black, 4 m
• L9842-11 Test Lead Reel, yellow, 10 m
• L9842-22 Test Lead Reel, red, 20 m
• C0106 Carrying Case
• Instrument Protector
• 4 × LR6 AA Alkaline Batteries
• Instruction Manual
• Operating Precautions
• Z3210 Bluetooth Adapter
• FT6031-90 Earth Tester
• FT6041 Earth Resistance Meter
• FT6041-91 Earth Resistance Meter
• FT6380-50 Earth Ground Clamp
• FT6380-90 Earth Ground Clamp
• L9787 Test Lead Set
• L9843-51 Test Lead, yellow, 50 m
• L9843-52 Test Lead, red, 50 m
• L9844 Test Lead Set
• L9845-31 Test Lead Cable Reel, yellow, 25 m
• L9845-33 Test Lead Cable Reel, blue, 25 m
• L9845-52 Test Lead Cable Reel, red, 50 m
• L9846 Earth Nets Module
• 9050 Earth Nets
