This accessory from Chauvin Arnoux is specifically designed for the Micro-Ohmmeters C.A 6250 and C.A 6255 and serves temperature compensation during resistance measurements. It enables the calculation of temperature-compensated resistance values, which is particularly important for materials with a high temperature coefficient, as their electrical resistance varies significantly with temperature. The function is essential to ensure accurate measurement results by eliminating the effects of temperature fluctuations on the measured resistance. The accessory is designed for professionals performing precise measurements in laboratories or industrial applications where temperature plays a critical role.

Applications
This accessory is used when the temperature of the measurement object affects measurement accuracy. This is particularly relevant for materials such as copper or aluminium, whose resistance increases with rising temperature. In industrial plants, during testing of connection points, or in quality control of electrical components, temperature compensation is necessary to achieve comparable and reproducible results. The application is used in environments requiring high measurement accuracy, for example in electrical engineering, mechanical engineering, or research.

Functions and Equipment in Detail
The accessory measures the temperature of the measurement object via an integrated temperature sensor PT100 and transmits this data to the Micro-Ohmmeter. The device then calculates the resistance value, converted to a reference temperature (typically 20 °C). This ensures that the measured values are independent of short-term temperature fluctuations. Integration is simple and requires no additional settings on the device. The function is directly integrated into the measurement routine, so the user does not need to perform any manual correction.

Technology Explained Simply
The temperature sensor PT100 is a platinum-based resistance thermometer with a nominal resistance of 100 Ohms at 0 °C. Its resistance changes linearly with temperature, enabling precise temperature measurements. The accessory uses this resistance value to determine the current temperature of the measurement object. The Micro-Ohmmeter uses this value to correct the measured resistance to a standard temperature. This is particularly important because many electrical materials have a high temperature coefficient, meaning their resistance varies significantly even with small temperature changes.

Compatibility and Accessories
The accessory is compatible exclusively with the Micro-Ohmmeters C.A 6250 and C.A 6255 from Chauvin Arnoux. It is not a universal accessory and cannot be used with other devices. Connection is made via the standardised interfaces of the Micro-Ohmmeters.

Mounting and Installation
Mounting is done by connecting the temperature sensor to the Micro-Ohmmeter. The exact connection method is described in the device’s user manual. The sensor is placed directly at the measurement point to capture the material’s temperature. Installation requires no special tools or additional components. The accessory can be used immediately after connection, without requiring calibration or adjustment.

Operational Advantages
Using this accessory leads to a significant improvement in measurement accuracy, especially in environments with variable temperatures. It enables the creation of comparable measurement results over extended periods or under different environmental conditions. The simplicity of integration and the automatic calculation process reduce the risk of errors caused by manual corrections. For users who value high precision, this accessory is an essential component for reliable resistance measurements.

Scope of Delivery
The product is delivered as a single accessory for temperature compensation for Micro-Ohmmeters. It includes 1x the accessory, consisting of the PT100 temperature sensor and the necessary connection components. The exact description of the scope of delivery is provided in the manufacturer’s product description. Batteries are not included in the scope of delivery.