Fluke 1535 Insulation Tester, 250 V Min, 2500 V Max, 500 GΩ CAT IV

This insulation tester is a battery-powered handheld instrument designed to measure insulation resistance in industrial and solar environments, delivering selectable test voltages between 250 V and 2500 V and resistance readings up to 500 GΩ. It features an LCD for clear readouts and is rated for use in CAT IV 600 V environments, making it suitable for frontline troubleshooting on factory floors and field installations. The unit operates across a wide ambient range and includes automatic calculations to assess insulation condition.

• Adjustable test voltages from 250 V to 2500 V for varied systems
• Measures insulation resistance up to 500 GΩ for high-resistance detection
• Short-circuit current up to 5 mA for faster, stable readings
• Battery operation on AA alkaline cells for remote use
• Automatic PI and DAR calculations to compensate for environmental effects

• Suitable for commissioning of solar arrays requiring high-voltage testing
• Ideal for periodic maintenance of industrial high-voltage equipment
• Used for insulation assessment on motors and cable systems
• Can be used for troubleshooting electrical installations on site

It runs from eight AA alkaline cells and the lightweight design facilitates handheld field use.

The voltage can be selected across a wide range from 250 V to 2500 V to match test requirements.

Measurement and safety conform to IEC 61557 and IEC 61010 standards with Pollution Degree 2 and CAT IV 600 V overvoltage categorisation.

It computes Polarisation Index and Dielectric Absorption Ratio to present conditioned insulation indicators.

The Advanced configuration provides AC/DC voltage and resistance measurement capability and dielectric discharge rate calculation.