This accessory from Chauvin Arnoux is specifically designed for the Micro-Ohmmeter C.A 6292 and is intended for the precise measurement of very low resistances. It consists of a set of two Kelvin clamps of the Hippo type, each with a current rating of 200 A, and available in red and black. The clamps enable a four-wire measurement, where the measurement current and the voltage input are separated to minimize the influence of contact resistances and lead resistances on the measurement result. This ensures high measurement accuracy for very small resistances, which is particularly required in the electrical industry or when testing conductive connections.

Applications
This accessory is designed for applications requiring reliable and accurate determination of resistances in the range from microohms to milliohms. Examples include testing screw connections, cable terminations, busbars, or other conductive connections in electrical installations. The 15 m length of the connecting cables allows flexible use even when the measurement point is distant from the measuring device, such as in large industrial plants or during machine maintenance.

Functions and Equipment in Detail
The two Kelvin clamps are designed as Hippo clamps, indicating a robust and ergonomic shape that ensures safe and comfortable handling, even with repeated use. The color coding (red/black) facilitates polarity assignment and reduces errors during connection preparation. The clamps are rated for a maximum current load of 200 A, making them suitable for measurements in installations with high current levels. The connecting cables are 15 m long to ensure sufficient reach during measurements.

Technology Explained Simply
The four-wire measurement performed with this accessory separates the current path from the voltage measurement path. The measurement current flows through two conductors (e.g., red and black) into the component being measured, while the voltage is measured at two separate points, as close as possible to the component. This excludes the resistance of the connecting leads and the contact resistances at the clamps from the measurement. This is particularly important for very small resistances, where even minor additional resistances could significantly distort the result. The Kelvin clamps are designed to keep contact resistance as low as possible and ensure a stable connection.

Compatibility and Accessories
This accessory is exclusively intended for the Micro-Ohmmeter C.A 6292. It is not suitable for other measuring instruments, as the connecting cables and clamps are specifically designed for the interfaces and measurement methods of this device. Use with other devices may lead to incorrect measurement results or damage.

Installation and Mounting
Installation is performed by directly connecting the Kelvin clamps to the connection being measured. The clamps are designed to create a secure and stable connection without requiring additional tools or aids. The 15 m cable length allows flexible placement of the measuring device without impairing the measurement point through cable extensions. The clamps are designed for use in industrial environments and can be operated under normal operating conditions.

Operational Advantages
Using this accessory enables precise and reproducible measurement of very low resistances. The separation of current and voltage measurement via the four-wire method reduces systematic errors. The robust construction of the Hippo clamps and the sufficient cable length of 15 m increase efficiency when performing measurements in larger installations. The color coding of the clamps supports correct assignment and reduces the likelihood of errors during measurement preparation.

Scope of Delivery
– 2 Kelvin clamps Hippo 200 A (red/black) with 15 m connecting cable