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

The Chauvin Arnoux CA 6545 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 resistance in electrical devices, motors, transformers, cables, and other installations. The device is designed for test voltages up to 5000 V and enables precise measurements in the range of 10 kΩ to 10 TΩ. The robust housing with IP53 protection class is suitable for use on construction sites and in demanding environments. Power supply is via a rechargeable NiMH battery, designed for an operating duration of approximately one month with regular use.

Insulation testing with programmable voltage
The CA 6545 offers a programmable test voltage from 40 V to 5100 V. In the range from 40 V to 1000 V, the setting is in steps of 10 V; from 1000 V onwards, in steps of 100 V. This allows flexible adaptation to different test objects and requirements. The measurement ranges vary depending on the test voltage: at 500 V, the range is from 10 kΩ to 2 TΩ; at 1000 V, from 100 kΩ to 4 TΩ; at 2500 V, from 100 kΩ to 10 TΩ; and at 5000 V, from 300 kΩ to 10 TΩ. Accuracy is ±5 % of the value ± 3 digits in the range from 1 kΩ to 400 GΩ, and ±15 % of the value ± 10 digits in the range from 400 GΩ to 10 TΩ.

Qualitative analysis with insulation parameters
The device not only performs quantitative measurements but also enables qualitative evaluation of insulation quality. This includes automatic calculation of parameters DAR (Dielectric Absorption Ratio, 1 min. / 30 sec.), PI (Polarization Index, 10 min. / 1 min.), and DD (Dielectric Discharge Index). These parameters help detect insulation aging and potential defects at an early stage. Test duration is programmable from 1 to 59 minutes, with adjustable PI times from 30 seconds to 59 minutes. The smoothing function (Smooth) with digital filtering ensures more stable measurement results.

Display and memory functions
Measurement values are displayed on a large, backlit LCD screen with a bar graph. This allows for quick visual evaluation of results. The device stores up to 20 measurement results in internal memory and provides a memory for R(t) curves with a capacity of 4 kilobytes. The display is optimized for direct field operation and shows numerical values as well as graphical representations.

Additional measurement functions and safety features
In addition to insulation resistance, the CA 6545 measures voltages up to 1000 Vac/dc, capacitances from 0.005 to 49.99 μF, and leakage currents from 0.001 nA to 3 mA. A voltage warning indicator activates at 25 V to warn the operator of hazardous voltages. Test inhibition enables safe operation, especially for inexperienced users, by limiting the test voltage. Electrical safety complies with standards IEC 61010-1 CAT III 1000 V and CAT IV 600 V, as well as IEC 61557.

Compatibility and accessories
Various accessories are available for use with the CA 6545, including HV test leads in different lengths (3 m, 8 m, 15 m, 35 cm) with crocodile clips or axial sockets, simplified HV-GUARD test leads, test probes with 4 mm sockets CAT III and CAT IV 1000 V, and a carrying case. These components support flexible application in different environments and enable safe and reliable measurements.

Operation and mounting
The device is designed for mobile use and is supplied with a foldable carrying handle, enabling space-saving storage. Power supply is via an integrated NiMH battery, which can be recharged using a power supply unit. Operation is via a graphical, backlit display with text, symbols, and bar graph. Measurement results can be transferred to a PC or printer via USB connection (on models CA 6547 and CA 6549). Dimensions are 270 x 250 x 180 mm, weight 4.3 kg.

Advantages in operation
The CA 6545 offers high measurement accuracy, comprehensive functionality, and robust construction, making it particularly suitable for use in industrial electrical engineering. The ability to calculate qualitative insulation parameters such as PI, DAR, and DD supports preventive maintenance and enables early detection of insulation defects. Programmable functions and safe operation via test inhibition increase efficiency and safety when testing electrical installations.