Easy Pole Clamp-On Ground Resistance Tester with Super S

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The FT6380-50 measures grounding resistance simply by clamping to multiple-grounded ground wires. No auxiliary grounding rod is needed, and there is no need to disconnect the ground wire from the grounding rod. The compact, low-profile sensor can be used to clamp ground wires with ease, and also provide AC current measurement functionality and can measure currents ranging from leakage current on the order of several mA to load currents of up to 60 A. CAT IV 600 V Key Features • Compatible with Hioki common free App GENNECT Cross (Optional Wireless Adapter Z3210 is necessary) • Wirelessly transfer measurement data to Excel forms for input (Will be supported by the 2021 upgrade) • Earth resistance measurement for multi-grounded systems • Measure leak current with absolute certainty with highly sensitive 0.01 mA resolution (at 20.00 mA range) • Measure load current up to 60.0 A range • Clamp at the narrowest point

Model No. (Order Code)

FT6380-50 Wireless Adapter Z3210 not included
FT6380-90 Bundled with the Wireless Adapter Z3210

FT6380-90 is sold in Japan and Hioki Europe region.


When Z3210 is installed



Multiple grounding can be easily checked with the clamps.




Measure multi-grounded systems

Clamp on the earth cable. The instrument has two cores for voltage injection and current measurement. 1. The voltage transducer injects a defined voltage into the multi-grounded system. 2. From the defined voltage and measured current, the total circuit loop resistance is calculated in the following equation. Rx + 1/ [ (1/R1) + (1/R2) + (1/R3) + (1/R4) + ... ] = V/I In a typical multi-grounded system, the parallel resistance value is small enough to be ignored and the equation as referred on the left can be simulated as follows. Rx = V/I



Clamp at the narrowest point!

The dramatically slim 0.79 inch (20mm) jaws let you finish your job easily and efficiently.



Transfer data via Bluetooth® wireless communication

The new FT6380-50 is compatible with the Wireless Adapter Z3210 (optional). When the Z3210 is installed, Bluetooth® wireless communication is enabled. The measurement data can be transferred to the dedicated free application GENNECT Cross or your Excel® files and reports.


See details about Wireless Adapter Z3210

Transfer data to an Excel® file

Open an Excel® file and select a cell. The measured value being held on the instrument’s display will be transferred to the PC and entered into the selected cell. Optional Wireless Adapter Z3210 is necessary.



Instantly create reports by a free app (GENNECT Cross)

GENNECT Cross, a free app designed specifically for use with Hioki measuring instruments, lets you check and manage measurement results and create reports. The software provides a range of functionality that helps manage data in the field, including photographing measurement sites, placing measurement results on photographs, and saving hand written memos. In the previous model FT6381, only Android was supported in a separate app, but the new model supports GENNECT Cross, allowing users to create reports together with measurements from other instruments. Optional Wireless Adapter Z3210 is necessary.


Click here for details about GENNECT Cross

Alarm Function

Set the alarm to audibly and visually notify yourself that the resistance or current value exceeds the threshold.



High Accuracy and Repeatability

Well-designed magnetic shields eliminate the leakage flux between the two cores that often affect measurement accuracy.



LCD with beautiful back light

With the bright back light, you can easily read the measurement value even in dark locations.



Large storage capacity (up to 2,000 data)

You can store up to 2,000 measurement values in the field and recall them in your office later.


Measurement principle Instrument has two cores for voltage injection and current measurement. From the defined voltage and measured current, the total circuit loop resistance is calculated
Note: For multi grounded systems only. In a multi-grounded system, the larger the number of grounding poles, the more accurate the measured value.
Earthing resistance 0.20 Ω (0.01 Ω resolution) to 1600 Ω (20 Ω resolution), 10 ranges, Zero suppression: Less than 0.02 Ω, 
Accuracy: ±1.5 % rdg. ±0.02 Ω
AC Current measurement 20.00 mA (0.01 mA resolution) to 60.0 A (0.1 A resolution), 5 ranges, Zero suppression: Less than 0.05 mA, 
Accuracy: ±2.0 % rdg. ±0.05 mA (30 Hz to 400 Hz, True RMS), Crest factor 5.0 or less (for the 60 A range, 1.7 or less)
Max. allowable input 100 A AC continuous, AC 200 A for 2 minutes or shorter (at 50/60 Hz, requires derating at frequency)
Max. rated voltage to earth 600 V AC CAT IV
Memory function 2000 data
Alarm function For resistance measurement and current measurement, Beeps when measured value is less than or greater than threshold
Other functions Data hold, Backlight, Filter, Auto power save
Display Digital LCD, max. 2000 dgt., Display refresh rate: 500 ms (2 times/s)
Waterproof and dustproof IP40 (EN60529) with clamp sensor closed
Communication interface N/A
Power supply LR6 (AA) alkaline battery ×2, Max. rated power: 450 mVA, Continuous use : 35 hr (in-house testing conditions)
Core jaw dia. φ 32 mm (1.26 in)
Dimensions and mass 73 mm (2.87 in) W × 218 mm (8.58 in) H × 43 mm (1.69 in) D, 620 g (21.9 oz)
Accessories Carrying case ×1, Resistance check loop (1 Ω, 25 Ω) ×1, Strap ×1, LR06 (AA) alkaline battery ×2, Instruction manual ×1
SKU FT6380-50
Brand Hioki
Shipping Weight 0.6200kg

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