Eigenschaften
Range	4 kΩ / 40 kΩ - 400 kΩ
Test voltage	50 /100 / 250 / 500 / 1000 V DC
Dimensions / weight	280 x 190 x 128 mm / 2,2 kg

This accessory from Chauvin Arnoux is specifically designed for the Micro-Ohmmeters C.A 6250 and C.A 6255 and is used for calculating the temperature-compensated resistance. It enables the adjustment of measured resistance values to a defined reference temperature, which is particularly necessary for materials with a high temperature coefficient, to make measurements under different environmental conditions comparable and reliable. Temperature compensation reduces the influence of temperature fluctuations on measurement results, thereby increasing the accuracy and consistency of measurements in industrial and technical applications.

Temperature compensation is the central feature of this accessory. It is used to convert the measured resistance value to a standard value at a specific temperature (e.g. 20 °C). This is particularly important for measurements on copper conductors or other metallic materials, whose resistance varies with temperature. The function thus supports compliance with standards and norms that require precise resistance values, regardless of the current ambient temperature.

Micro-Ohmmeters are specialized measuring instruments for determining very low resistances, typically in the range of milliohms to ohms. The devices C.A 6250 and C.A 6255 are designed for such measurements and offer high resolution and accuracy. The accessory described here extends their functionality by integrating temperature compensation, which is important for precise resistance measurements in electrical installation technology, when testing connection points, switches or conductors.

Application area includes particularly industrial and technical measurement tasks, where resistance measurements are carried out under variable environmental conditions. For example, when testing electrical installations in production halls, during machine maintenance or during the installation of power supply systems. Temperature compensation ensures that measured values are not distorted by short-term temperature changes, which increases the reliability of the inspection.

Use in electrical installation technology often requires measuring resistances in conductors, connections or earthing systems. During these measurements, the temperature of the material can vary significantly, which would lead to measurement errors if not compensated. The accessory enables the measured values to be referenced to a uniform temperature basis, which is particularly important for repeat inspections or for documenting the condition of systems.

Compatibility is limited to the models C.A 6250 and C.A 6255. The devices must have the appropriate interface and software function to use temperature compensation. The accessory is not a standalone measuring instrument, but complements the functions of the specified Micro-Ohmmeters. The exact method of integration (e.g. via an interface or software update) is described in the operating instructions, which are included in the delivery.

Delivery contents include the accessory for temperature compensation and the operating instructions. The exact technical details of the accessory are described in the document, but not specified in the text. The instructions contain the necessary information for installing and using the accessory with the compatible devices.

Operational advantages lie in increased measurement accuracy and comparability of measurement results across different times and environments. This is crucial for quality assurance in electrical installation and for compliance with standards such as IEC 61557, which prescribe precise measurement methods. Temperature compensation reduces sources of error and ensures a reliable assessment of the electrical condition of installations and components.