Easy Pole Clamp-On Ground Resistance Tester with
Super Slim Jaw
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. : FT6380-50

Multiple grounding can be easily checked with the clamps.


Can 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 Z3210 wireless adapter (option).
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.

For more information on the Z3210, click here.

Transport to the Excel® file (It will be supported by the 2021 upgrade.)

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.

Transport to 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 GENNECT Cross special site.

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.

Basic specifications (Accuracy guarantee period: 1 year, Accuracy guarantee period after adjustment made by Hioki: 1 year)

Measurement principleInstrument 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 range\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 range20.00 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)
Maximum input current (Current measurement)100 A AC continuous, AC 200 A for 2 minutes or shorter (at 50 Hz/60 Hz, requires derating at frequency)
Maximum rated terminal-to-ground voltage600 VAC measurement category IV (anticipated transient overvoltage 8000 V)
Memory function2000 data
Alarm functionFor resistance measurement and current measurement, Beeps when measured value is less than or greater than threshold.
Other functionsData hold, Backlight, Filter, Auto power save, Wireless communication (without Z3210 installed))
DisplayLCD, Max. 2,000 count Display refresh rate: Approx. 2 times/sec.
Dust-proof and waterproofIP40 (EN60529) With Jaws Closed
Power supplyLR6 alkaline battery × 2
Continuous operating timeApprox. 40 hours (25 Ω measurement, backlight off, without Z3210 installed)
Approx. 35 hours (25 Ω measurement, backlight off, with Z3210 installed and using wireless communications)
Maximum measurable conductor diameterφ 32 mm (1.26 in)
Dimensions and mass73 mm (2.87 in) W × 218 mm (8.58 in) H × 43 mm (1.69 in) D, 620 g (21.9 oz)
AccessoriesCarrying case, Resistance check loop (1 Ω±2%, 25Ω±1%), Strap, LR6 alkaline battery × 2, Instruction manual
Catalog: CLAMP ON EARTH TESTER FT6380-50Download PDF  [2MB]English