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

The CA 6547 from Chauvin Arnoux is a digital insulation tester for use in industrial electrical engineering and for the maintenance of electrical installations. It is used for quantitative and qualitative testing of insulation resistances in machines, transformers, cables, and other electrical devices. The device features a measurement range from 10 kΩ to 10 TΩ and allows test voltages from 40 V to 5100 V, with voltage steps of 10 V up to 1000 V and 100 V from 1000 V onwards being programmable. Measurement is performed using a rechargeable NiMH battery, designed for an operating life of approximately one month with daily measurements. The robust housing with IP53 protection class is suitable for use on construction sites and in demanding environments.

Applications

The CA 6547 is used for testing insulation resistances in electrical machines, motors, generators, transformers, and cables. It is particularly suitable for preventive maintenance measures, where insulation quality is monitored over extended periods. Measurement is performed both quantitatively (resistance value) and qualitatively through the calculation of parameters such as the Polarization Index (PI), Dielectric Absorption Ratio (DAR), and Dielectric Discharge Index (DD). These parameters help assess the condition of insulation and detect deterioration at an early stage.

Functions and Equipment in Detail

The device features a large, backlit LCD display showing numerical values and a bar graph. The display enables quick visual evaluation of measurement results. The test voltage can be set in steps of 10 V up to 1000 V and 100 V from 1000 V onwards. The test duration is programmable from 1 to 59 minutes. Leakage current measurement is performed in the range of 0.001 nA to 3 mA, and capacitance measurement from 0.005 to 49.99 μF. Accuracy is ±5 % of the value ± 3 digits in the range from 30 kΩ to 40 GΩ, and ±15 % of the value ± 10 digits in the range from 40 GΩ to 10 TΩ.

Technology Explained Simply

Insulation resistance measurement is performed by applying a test voltage and measuring the resulting leakage current. The resistance is calculated from the ratio of voltage to current. The functions DAR, PI, and DD are used for qualitative evaluation of insulation. DAR (Dielectric Absorption Ratio) is calculated from the ratio of resistances measured after 1 minute and 30 seconds. PI (Polarization Index) is derived from the ratio of resistances measured after 10 minutes and 1 minute. DD (Dielectric Discharge Index) is used to detect defects in multi-layer insulation. The smoothing function (Smooth) reduces measurement noise through digital filtering.

Compatibility and Accessories

The device is equipped with a USB interface, enabling data transfer to a PC. The optional DataView® software supports evaluation and archiving of measurement results. Compatible accessories include various HV test leads with crocodile clips in different lengths (3 m, 8 m, 15 m) and colors (blue, red, black), including variants with Guard function. Additionally, test probes with 4 mm sockets, a carrying case, a power cable, and a C173 CV clamp for fault currents are available. The test leads are rated for a test voltage of 5 kV.

Mounting and Installation

The device is connected directly to the installation under test. The test leads connect the device to the test points. The display shows the measured values, with voltage warning indication activated from 25 V. Test inhibition allows limiting the test voltage to protect inexperienced operators. Power supply is via the built-in NiMH battery, which can be charged using the power cable. Dimensions are 270 x 250 x 180 mm, and weight is 4.3 kg.

Operational Advantages

The CA 6547 offers high measurement accuracy and a comprehensive range of functions for insulation testing. Storage of up to 1500 measurement results and USB connectivity enable efficient documentation and evaluation. Programmable test voltages and durations, along with the calculation of quality parameters, support precise assessment of insulation quality. The robust construction and IP53 protection class make the device suitable for use in harsh environments. The integrated smoothing function ensures stable measurement results, even under difficult conditions.

Electrical Safety

The device complies with standards IEC 61010-1 CAT III 1000 V and CAT IV 600 V, as well as IEC 61557. Safety features include voltage warning indication from 25 V and test inhibition, which can limit the test voltage. Measurement is performed in the range of 0 to 1000 Vac/dc. The display and functions are designed to ensure safe and reliable use even under difficult conditions.