Eigenschaften
Range	-
Charger	-
Dimensions / weight	223 x 126 x 70 mm / 1 kg

The CA 6422 earth resistance tester from Chauvin Arnoux is a robust measuring instrument for 2-pole and 3-pole earth resistance measurements in the field. It is suitable for applications where high ground resistances must be measured, and offers a measurement range limit of up to 50 kΩ in 2-pole mode and up to 2 kΩ in 3-pole mode. The device is designed for intensive use under difficult environmental conditions and features a waterproof housing with protection class IP 65 according to IEC 60529, ensuring dust protection and protection against water jets from any direction. The mechanical shock resistance corresponds to IK 04 according to IEC 50102, and the device passes a drop test from a height of 1 metre according to IEC 61010-1, ensuring safe operation under harsh conditions.

Applications
The CA 6422 is used in electrical and installation trades to verify the effectiveness of earthing systems. It is suitable for testing protective and functional earthing in buildings, industrial plants, outdoor installations, and other electrical installations. Measurements are performed either in 2-pole mode for resistance measurements or in 3-pole mode for earth resistance measurements. The connections are colour-coded and labelled to prevent connection errors. Operation is via buttons on the front panel, which can also be operated with gloves.

Functions and Equipment in Detail
The device features a backlit LCD display with 206 segments, enabling clear and easy-to-read display of measurement values. The display stabilises automatically via an internal filter, ensuring the measurement result is continuously shown. If hazardous stray voltages are present, no measurement is performed, and a warning light blinks to inform the operator. A blinking NOISE symbol indicates the presence of interfering stray voltages that could affect measurement accuracy. In this case, the device automatically optimises measurement accuracy by switching the measurement frequency from 128 Hz to 256 Hz.

Technology Explained Simply
Measurement is performed by applying a test voltage with an open-circuit voltage of ±10 V peak. The measurement frequency can be selected between 128 Hz and 256 Hz to improve measurement accuracy in the presence of interfering voltages. Power supply is via 6 standard LR6 or AA batteries, making the device immediately ready for use. The autonomy exceeds 2000 earth measurements in 3-pole mode at a resistance of 100 Ω. The device is designed for use in environments from -10 °C to +50 °C, with storage up to -40 °C and +70 °C (without batteries). Electrical safety complies with the standard 600 V CAT IV, and the device meets EMC requirements according to IEC 61326-1 and IEC 61010-2-030.

Compatibility and Accessories
Various accessory components are available for use with the CA 6422, including a carrying strap, an accessory set for earth resistance measurement with two electrodes (15 m), an accessory set with two electrodes (50 m), and a transport bag. These components support practical handling and safe transport of the device in the field.

Installation and Mounting
Installation is performed by directly connecting the test leads to the colour-coded sockets of the device. The connections are clearly labelled (e.g. H, S, E, Ω, COM, V) to prevent incorrect connections. Measurement is started by pressing the TEST button, with the measurement type (2-pole or 3-pole) selected by the duration of the button press. The display shows the measurement result, with warning symbols blinking in case of interference.

Operational Advantages
The CA 6422 offers high operational safety through automatic detection of hazardous voltages and stabilisation of measurement values. The high autonomy and use of standard batteries ensure uncomplicated and immediate readiness for use. The robust construction and IP 65 protection class make the device suitable for outdoor and harsh environment use. Compliance with standards IEC 61557-1 and IEC 61557-5 ensures the reliability and accuracy of measurement results.

Note: Batteries are not included in the delivery scope.