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

This accessory is a current clamp AC MN82, specifically developed for the grounding and earth resistance meters C.A 6471 and C.A 6472 by Chauvin Arnoux. It is used for performing selective grounding measurements with a single clamp and for spikeless grounding measurements, where two clamps are employed. The clamp enables the measurement of grounding resistances in complex installations where multiple grounding circuits are present in parallel, without the need to interrupt physical connections. The maximum current rating is 10 Aeff, and the maximum conductor diameter that can be measured is 20 mm. These specifications make the accessory suitable for various applications in grounding measurement, particularly in electrical and energy technology.

Applications
This accessory is primarily used in the field of electrical safety and testing of grounding systems. It enables precise measurement of grounding resistances in existing installations, especially in systems with parallel grounding circuits. The spikeless measurement using two clamps reduces the need to interrupt conductors, shortening measurement time and increasing safety. Selective measurement with a single clamp allows individual grounding circuits to be analyzed independently, which is advantageous for diagnosing faults or maintaining installations.

Functions and Equipment in Detail
The clamp is designed for use with the C.A 6471 and C.A 6472 devices and enables grounding measurements according to the 2P or 4P method, with the measurement type being selectable. The measurement is performed by using the clamp, which encloses the conductor under test, thereby capturing the current flow. The clamp is rated for currents up to 10 Aeff and can measure conductors with a diameter up to 20 mm. The measurement is carried out without physical connection to the grounding conductors, making the process faster and safer.

Technology Explained Simply
The clamp operates as a current transformer, inductively detecting the electrical current in a conductor. This measurement method allows current to be measured without direct contact, which is particularly advantageous in operating installations. The clamp is inserted into the C.A 6471 or C.A 6472 measuring device, enabling the device to process the measured values and calculate the grounding resistance. The measurement is performed in the frequency range of 41 Hz to 5078 Hz, with the frequency being selectable either automatically or manually. The test voltage is selectable and includes values of 10 V, 16 V, 32 V RMS, or 60 V. The measurement accuracy is ± 2 % of the value ± 1 pt, ensuring high precision in evaluating grounding quality.

Compatibility and Accessories
This accessory is compatible exclusively with the grounding and earth resistance meters C.A 6471 and C.A 6472 by Chauvin Arnoux. It is used in conjunction with these devices to extend measurement functions. Additional accessories that can be used with these devices include the grounding and earth resistance measurement kit with 4 electrodes (100 m or 150 m), the Li-Ion battery charger, the optical USB cable, and the DataView software. These components support measurement and data processing, but they are not part of this item.

Installation and Mounting
The clamp is directly inserted into the C.A 6471 or C.A 6472 measuring device. Installation requires no additional tools or connections. The clamp is placed around the conductor to be measured, ensuring the conductor diameter does not exceed 20 mm. The measurement is initiated via the device, with the clamp capturing the current flow and the device calculating the grounding resistance. Operation is performed using the controls of the measuring device, with the clamp functioning as an external measuring instrument.

Operational Advantages
The use of the clamp enables fast and safe measurement of grounding resistances, especially in complex installations with parallel grounding circuits. Spikeless measurement reduces the need to interrupt conductors, shortening working time and increasing safety. Selective measurement allows individual grounding circuits to be analyzed independently, which is beneficial for fault diagnosis or maintenance of installations. The high measurement accuracy and compatibility with the C.A 6471 and C.A 6472 devices ensure reliable results.

Scope of Delivery
The product includes the accessory clamp(s) for the C.A 6471 / C.A 6472 devices and the user manual.