Eigenschaften
Voltage warning indicator	Ja > 25 V
Dimensions / weight	270 x 250 x 180 mm / 4,3 kg

The Chauvin Arnoux insulation tester is a digital measuring instrument for quantitative and qualitative testing of insulation resistances in electrical installations and devices. The device features a robust, site-suitable housing and is designed for use under demanding conditions. It enables precise measurements in the range of 10 kΩ to 10 TΩ, depending on the selected test voltage, and offers comprehensive functionality for evaluating insulation quality.

Insulation measurement with programmable test voltage
The tester supports four predefined test voltages: 500 V, 1000 V, 2500 V, and 5000 V. Additionally, the test voltage can be individually programmed in the range of 40 V to 5100 V in steps of 10 V (up to 1000 V) or 100 V (from 1000 V onwards). This allows flexible adaptation to different application scenarios, such as testing motors, transformers, cables, or generators. Measurement accuracy is ±5 % of the value ± 3 digits in the range of 1 kΩ to 400 GΩ, and ±15 % of the value ± 10 digits in the range of 400 GΩ to 10 TΩ.

Qualitative analysis with insulation parameters
In addition to the pure insulation resistance, the device automatically calculates quality parameters DAR (Dielectric Absorption Ratio), PI (Polarization Index), and DD (Dielectric Discharge Index). These parameters enable a deeper evaluation of insulation quality, especially for heterogeneous or multi-layered insulation. The test duration can be programmed between 1 and 59 minutes, with adjustable times from 30 seconds to 59 minutes also available for PI. The measurement values are displayed on a large, backlit LCD screen with a bar graph, enabling quick visual assessment.

Safety functions and measurement aids
The device features a voltage warning indicator, activated from 25 V, and a test inhibition function that can be set according to the test voltage. A digital smoothing function stabilizes measurements and reduces interference. Capacitance measurements are performed in the range of 0.005 to 49.99 μF, and leakage current can be measured from 0.001 nA to 3 mA. Electrical safety complies with standards IEC 61010-1 CAT III 1000 V and CAT IV 600 V, as well as IEC 61557.

Storage and display
Measurement results can be stored in an internal memory with 4 kilobytes capacity for R(t) curves and up to 20 measurement results. Display is via a large, backlit LCD screen combining numerical values and a bar graph. Power supply is via rechargeable NiMH batteries, sufficient for operation over several weeks depending on usage frequency.

Accessories and compatibility
Various accessories are available for use with the device, including high-voltage cables with insulated crocodile clips in different lengths (3 m, 8 m, 15 m, 35 cm), test leads with 4 mm sockets, test probes, and a transport bag. The cables are rated for 5 kV and equipped with blue, insulated crocodile clips. Test leads can also be supplied with axial sockets or crocodile clips, depending on requirements.

Applications
The insulation tester is suitable for maintenance and inspection of electrical machines, motors, generators, transformers, and cables. It is used for both Go/No-Go testing and qualitative measurements as part of preventive maintenance. The direct display of voltages, frequencies, capacitances, and fault currents immediately after connection supports quick diagnosis.