Eigenschaften
Range	4000 µΩ, 40 mΩ, 400 mΩ, 4000 mΩ, 40 Ω, 400 Ω
Dimensions / weight	270 x 250 x 180 mm / 5 kg
Test probe diameter	2 mm
Weight	2 x 420 g
Probe tip length	10 mm

This accessory from Chauvin Arnoux consists of a set of two Kelvin test probes, specifically designed for precise measurement of small resistances with the Micro-Ohmmeters of models CA 6240, CA 6250 and CA 6255. The test probes enable the application of the 4-wire method, which is required for high measurement accuracy at low resistances, as it excludes the influence of lead resistances. Measurement is performed with a test current of 1 A, suitable for reliable detection of resistances in the range of 4000 µΩ to 400 Ω. The precision is 0.25 % ±2 pts across all measurement ranges, while the resolution varies per range between 1 µΩ and 100 mΩ. The test probes feature a test probe diameter of 2 mm and a test probe spacing of 3.5 mm, ensuring precise contact at narrow or small measurement points. The test probe length is 10 mm, and the maximum resistance of each test probe is 50 mΩ, further supporting measurement accuracy.

Applications include particularly electrical testing in industry, in operational buildings or in laboratories, where high accuracy is required for determining contact resistances, screw connections or circuit traces. The cable length is 3.15 m, sufficient to separate the measurement point from the device and enable safe operation. The test probes are equipped with a safety plug with Ø 4 mm, which can be connected directly to the measuring device. Alternatively, the included fork cable lugs (Ø 4–6 mm) can be used to attach the test probes to cables or conductors. The electrical safety complies with IEC 61010, Category CAT III up to 50 V, enabling use in industrial environments with corresponding safety requirements.

Functions and equipment in detail include the retractable and rotatable construction of the test probes, allowing flexible handling and secure positioning at different measurement points. The weight per test probe is 420 g, ensuring convenient handling. The dimensions of the test probes are 154 mm in length and 30 mm in width, with a depth of 28 mm, while the handle is 108 mm long and 40 mm wide. Communication with the device is via an optical / USB connection, used for data transfer and storage of up to 100 measurements.

Compatibility and accessories are limited to the Micro-Ohmmeters CA 6240, CA 6250 and CA 6255. These components can be used additionally to enhance the functionality and mobility when using the test probe set.

Mounting and installation are performed by direct connection to the measuring device via the 4 mm plug or via the fork cable lugs to the conductors to be tested. The test probes are designed for easy handling, with the retractable construction enabling secure storage and transportability. The application requires no additional tools or special mounting procedures.

Operational advantages lie in high measurement accuracy, flexibility in connection type and robust construction suitable for industrial environments. The 4-wire method ensures reproducible results, and the integrated memory function enables documentation of measurement values. The test probes are designed for long service life and support maintenance and testing of electrical installations with high reliability.

Technology explained simply: The 4-wire method separates current supply from voltage measurement, so that the resistance of the leads does not affect the measurement. This is particularly important for very small resistances, where even minor lead resistances could significantly distort measurement results. The test probes are dimensioned to ensure stable contact without damaging the connection being tested. The use of NiMH batteries in the device enables mobile operation, while the accessory itself does not contain any batteries.