Beha 5592398 1535 insulation tester up to 2500 V content_copy

The Fluke 1535 is a portable insulation tester designed for service technicians, electricians, and companies maintaining electrical systems such as motors, transformers, enclosures, or solar installations. The device enables precise insulation testing with selectable test voltages ranging from 250 V to 2,500 V and measures insulation resistance up to 500 GΩ. It is designed for use in measurement category CAT IV 600 V, ensuring high safety when measuring on main distribution boards and other high-voltage installations. The integrated function for automatic calculation of the polarization index (PI) and dielectric absorption ratio (DAR) supports assessment of insulation quality over time and enables more in-depth diagnosis of insulation degradation. An integrated voltage alarm warns the user of dangerous voltages at the test point, enhancing workplace safety.

Applications
The Fluke 1535 is suitable for maintenance and testing of electrical systems in industry, energy supply, and building technology. Typical applications include testing motors, transformers, enclosures, cables, and solar installations. The selectable test voltages allow adaptation to different system voltages and insulation requirements. The measurement range up to 500 GΩ also covers high-quality insulation materials used in modern installations.

Features and Equipment in Detail
The device offers four fixed test voltages: 250 V, 500 V, 1,000 V, and 2,500 V, which can be selected according to application. Measurements are taken in the range of 200 kΩ to 500 GΩ, enabling high resolution and accuracy in assessing insulation resistance. The automatic calculation of PI and DAR helps track insulation condition over extended periods and detect wear or defects early. The integrated voltage alarm ensures the user is warned of unexpected voltages at the test point, increasing operational safety.

Technology Explained Simply
The test voltage is applied by the device via the test cable to the insulation under test, and the resulting current is measured. The insulation resistance is calculated from the ratio of voltage to current. The measurement category CAT IV 600 V means the device is suitable for measurements on main distribution boards and other high-voltage installations where high transient voltages may occur. The measurement range up to 500 GΩ allows assessment of even very high-quality insulation materials. The PI and DAR functions are based on the time-dependent development of insulation resistance during measurement and provide additional information on insulation quality.

Compatibility and Accessories
The Fluke 1535 is powered by 8 AA alkaline batteries (IEC LR6). No specific accessories are mentioned in the sources; however, typical accessories for such devices include test leads, insulation cables, and protective caps, which are necessary for safe and correct measurement execution. Using appropriate test leads is crucial to avoid measurement errors and ensure safety.

Mounting and Installation
The device is designed as a portable measuring instrument and requires no mounting. It is directly connected to the system under test, with test leads connected to the appropriate contacts. Operation is via a keypad and display with dimensions of 73.5 mm × 104 mm. The operating temperature range is from −10 °C to 50 °C, allowing use in various environments.

Operational Advantages
The Fluke 1535 combines multiple functions in a compact device, increasing productivity and reducing the number of required tools. The selectable test voltages and automatic PI and DAR calculations enable fast and comprehensive diagnostics. The high safety class CAT IV 600 V protects the user during measurements on high-voltage installations. The integrated voltage warning enhances operational safety. The device is easy to operate and provides clear display of measurement results.