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

The Chauvin Arnoux CA 6471 is a digital earth and earth resistance tester, developed for comprehensive assessment of earthing systems. The device combines five measurement functions in one: earth resistance, coupling resistance, specific earth resistance, continuity testing, and selective earth measurement. It is designed for on-site use, featuring a robust, shock-protected housing and a compact design that enables mobile operation in the field. Operation is performed via an integrated rotary switch, allowing intuitive and quick selection of measurement functions.

Applications

The CA 6471 is suitable for all types of earth measurements in electrical engineering, particularly for testing protective and functional earthing in buildings, industrial plants, power supply networks, and for the maintenance of electrical installations. The selective earth measurement function enables measurement of individual earth electrodes within an earthing system, with the use of a clamp current transformer allowing measurement without earth spikes. Measurement of earth loop impedance is also possible when two clamp current transformers are used.

Functions and Equipment in Detail

The device offers a measurement range of 0.001 Ω to 100 kΩ for earth resistances, with measurement accuracy of ± 2 % of the value ± 1 pt. The measurement frequency can be set automatically or manually between 41 Hz and 512 Hz, enabling adaptation to different environmental conditions and interference sources. The test voltage is selectable between 16 V and 32 V, and the test current can reach up to 250 mA. The measurement method includes the 2P or 4P method, with the 4P method being suitable for higher accuracy at low resistances. Calculation of specific soil resistance is performed using the Wenner or Schlumberger method with automatic calculation and display in Ω-meters. The coupling coefficient is also automatically calculated from three measurements.

Technology Explained Simply

Measurement is performed using classical methods with earth spikes, with automatic self-diagnosis before each measurement detecting and indicating possible errors such as poor connections or interference signals. The USB interface with optical isolation enables secure data transfer to a PC, with the software Ground Tester Transfer used for evaluation and documentation of results. Measurement values can be saved automatically or manually, with storage capacity for up to 512 test results. The power supply is provided by a rechargeable NiMH battery, which can be charged via an external charger with 18 Vdc / 1.5 A or via a vehicle power supply with 12 Vdc.

Compatibility and Accessories

Various accessories are available to extend functionality, including an accessory set for earth measurement with two earth electrodes (50 m or 100 m), a clamp current transformer C182, an adapter for battery charging via cigarette lighter, an optical USB cable, and the DataView software. These components enable flexible adaptation of the device to different measurement tasks and environments.

Mounting and Installation

Installation is performed via color-coded connection sockets, which facilitate correct connection of measurement leads. Integrated connection diagrams on the lid support correct wiring and minimize error sources. The device is designed for outdoor use, with a protection rating of IP53, protecting it against dust and splashing water. Electrical safety complies with the standard IEC 61557 -1, -4, -5 and installation category IEC 61010 CAT IV 50 V.

Operational Advantages

The CA 6471 offers high measurement accuracy, flexible adaptation to various measurement conditions, and easy operation. The combination of multiple measurement functions in a single device reduces equipment requirements and accelerates testing processes. Storage and evaluation of measurement data via USB and software enable structured documentation and analysis of results. The robust construction and mobile power supply make the device a reliable tool for electrical professionals in the field.