The Chauvin Arnoux C.A 6418 Earth Clamp is a professional clamp-on ground resistance tester designed for fast, safe, and reliable testing of earthing systems without the need to disconnect the earth conductor. Featuring a unique oblong jaw design, the C.A 6418 is ideal for measuring earth loop resistance and leakage current on earth cables, straps, bars, and rods, even in confined spaces.
Designed for electrical contractors, industrial maintenance engineers, and power distribution specialists, the C.A 6418 simultaneously displays earth resistance and leakage current, providing a complete assessment of grounding system performance. The high-visibility OLED display offers a 180° viewing angle for easy reading in all lighting conditions, while automatic jaw-gap calibration ensures accurate and repeatable measurements every time. Measurements can be stored internally with time and date stamps, making reporting and record keeping simple and efficient.
 
Key Features
Clamp-on earth resistance testing without disconnecting conductors
Simultaneous display of earth resistance and leakage current
Oblong jaw design for earth bars, straps, rods, and cables
OLED display with 180° visibility
Automatic jaw-gap calibration at start-up
Automatic Pre-HOLD function when clamp is opened
Configurable resistance and current alarms
Internal memory for up to 300 measurements with date/time stamping
Suitable for domestic, commercial, industrial, and utility applications
CAT IV 100 V / CAT III 150 V safety rating
 
Technical Specifications
Specification
Details
Earth Resistance Range
0.01 Ω to 1,200 Ω
Earth Resistance Accuracy
±1.5% + 0.01 Ω (best range)
Leakage Current Range
0.5 mA to 20 A AC
Leakage Current Accuracy
±2%
Resolution
1 mΩ to 50 Ω (resistance), 50 µA to 100 mA (current)
Maximum Conductor Diameter
32 mm
Bar Measurement Capacity
30 x 40 mm or 20 x 55 mm
Display
152-segment OLED, 48 x 39 mm active area
Memory
300 readings with date and time stamp
Power Supply
4 x AA (LR6) alkaline or NiMH batteries
Battery Life
Approx. 2,400 measurements (30-second tests)
Protection Rating
IP40
Safety Rating
CAT IV 100 V / CAT III 150 V
Dimensions
300 x 106 x 56 mm
Weight
Approx. 1.2 kg including batteries
Calibration
Automatic at start-up with recalibration capability
 
Applications
Electrical installation testing
Grounding and bonding verification
Industrial maintenance
Lightning protection systems
Telecommunications sites
Utility and power distribution networks
Renewable energy and solar installations
 
Supplied With
Chauvin Arnoux C.A 6418 Earth Clamp
Carrying case
Calibration loop
4 x AA batteries
Wrist strap
User documentation
Verification certificate