Lightweight Ground Resistance Tester with Bluetooth® Data Transfer
The FT6381 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.

Model No. (Order Code)

FT6380Built in Bluetooth(R) wireless technology

Note: The application supports Android™ OS 2.1 or later,
but proper operation is not guaranteed on all Android™
handsets. Please download and install the “FT6381 Communication
Software” from the Google Play™ store in order to use the wireless
connection function with an Android™ phone.
*For the latest information about countries and regions where wireless
operation is currently supported, please visit the Hioki website.
*Bluetooth® is a trademark of Bluetooth SIG, Inc. and licensed for use
by Hioki E.E. Corporation.


Key Features

• 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
• Data transfer to Android™ phones using Bluetooth® wireless technology (FT6381)
• Real time data transfer, automatic report generation on Android™ phone (FT6381)

Product Video

Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 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 range0.20 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)
Max. allowable input100 A AC continuous, AC 200 A for 2 minutes or shorter (at 50/60 Hz, requires derating at frequency)
Max. rated voltage to earth600 V AC CAT IV
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
DisplayDigital LCD, max. 2000 dgt., Display refresh rate: 500 ms (2 times/s)
Waterproof and dustproofIP40 (EN60529) with clamp sensor closed
Communication interfaceModel FT6381 only: Bluetooth® v2.1+EDR, Compatibility for Smartphone / Tablet, Displays measured values on the screen of an Android™ handset via Bluetooth®, Applicable OS: Android™ 2.1 or later
Power supplyLR6 (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 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 ×1, Resistance check loop (1 Ω, 25 Ω) ×1, Strap ×1, LR06 (AA) alkaline battery ×2, Instruction manual ×1

Countries and regions where wireless operation is currently supported (FT6381)

Wireless certificationJapan, United States, Canada, Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, United Kingdom, Thailand, Singapore, Taiwan, Korea, Indonesia, New Zealand, Chile, Serbia, Mexico, and Panama
Exempt from the wireless regulationsViet Nam, Hong Kong, Macao, India, Russian Federation, Colombia, Pakistan, and Georgia


Catalog: CLAMP ON EARTH TESTER FT6380, FT6381Download PDF  [2MB]English

For more information, click here