Eigenschaften
Dimensions / weight	272 x 250 x 128 mm / 3,2 kg

The digital grounding and earth resistance meter CA 6470N from Chauvin Arnoux is a compact measuring instrument for comprehensive inspection of grounding systems. It combines four measuring functions in one device: earth resistance, coupling resistance, specific earth resistance, and continuity testing. The robust, shock-protected housing with integrated lid is designed for field use and provides protection against mechanical stress. The color-coded connection sockets and connection diagrams on the lid support error-free wiring and facilitate on-site operation.

Applications
This device is suitable for testing grounding systems in industry, energy supply, and construction. It enables measurement of earth resistances in the range of 0.001 Ω to 100 kΩ, with the measuring frequency adjustable between 41 Hz and 512 Hz automatically or manually. This flexibility is particularly advantageous for measurements in high-resistance soils, where manual frequency adjustment can improve accuracy. Measurements are performed using the 2P or 4P method, with the 4P method providing higher accuracy for low earth resistances.

Functions and Equipment in Detail
The CA 6470N allows measurement of specific earth resistance using the Wenner or Schlumberger method, with results automatically calculated and displayed in Ω-meters. Coupling resistance measurement is performed via three consecutive measurements, with the device automatically calculating the coupling coefficient. Continuity testing is used to check the electrical continuity of conductors and grounding leads. Measurement accuracy is ± 2 % of the value ± 1 pt, enabling reliable assessment of grounding systems.

Technology Explained Simply
Power supply is provided by a rechargeable NiMH battery, which can be charged via an external power supply unit (18 Vdc / 1.5 A) or a vehicle power supply (12 Vdc). The measuring frequency can be set between 41 and 513 Hz, with automatic selection optimizing measurements in different environments. The test voltage is selectable between 16 V and 32 V, and the test current reaches up to 250 mA. Measured values are stored in an internal memory with capacity for 512 test results. The USB interface with optical isolation enables secure data transfer to a PC.

Compatibility and Accessories
Data can be transferred via the USB interface using the Ground Tester Transfer software to a computer for reading and analysis. Suitable accessories include optical USB cables, accessory kits for grounding and earth resistance measurements with 2 or 4 electrodes (in various lengths from 50 m to 150 m), a probe for continuity testing, an adapter for charging the battery via a cigarette lighter, and the DataView software. These components support efficient field measurements.

Installation and Mounting
Installation is performed by connecting the electrodes to the color-coded sockets, with the connection diagrams on the lid supporting correct wiring. Measurements can be carried out directly on-site without requiring additional devices or tools. The device’s self-test before each measurement ensures that no interference or poor connections affect the results.

Operational Advantages
The CA 6470N offers high measurement accuracy and flexibility in selecting the measuring frequency, increasing the reliability of results. The integrated memory capacity and USB interface enable efficient documentation and analysis of measurement data. The robust construction and IP53 protection rating make the device suitable for outdoor use. Compliance with standards IEC 61557-1, -4, and -5, as well as installation category IEC 61010 CAT IV 50 V, ensures electrical safety during use.