Fluke 1555 10 kV Insulation Resistance Tester

The Fluke 1555 10 kV Insulation Resistance Tester is a high-voltage diagnostic instrument engineered to measure insulation integrity in switchgear, motors, generators, and cables. It delivers insulation resistance measurements up to 2 TΩ across selectable DC test voltages from 250 V to 10,000 V, supporting preventative and predictive maintenance workflows. The unit combines a large digital/analog LCD display with advanced analysis functions including automatic Dielectric Absorption Ratio (DAR) and Polarization Index (PI) calculations, guard system leakage current elimination, and optional ramp function capability for breakdown testing.

Technical Specifications

Insulation Resistance & Voltage

• Test voltages (DC): 250 V to 1000 V in 50 V steps; above 1000 V in 100 V steps


• Maximum resistance measurement: 2 TΩ


• Safety rating: CAT III 1000 V, CAT IV 600 V


• Line voltage warning: Displays up to 600 V AC or DC Measurement Capabilities


• Capacitance measurement supported


• Leakage current measurement supported


• Guard system for surface leakage current elimination


• Ramp function for breakdown testing


• Automatic DAR and PI calculation Accuracy


• Specified accuracy valid one year after calibration at 0 °C to 35 °C


• Temperature derating: ±0.25 % per °C (−20 °C to 0 °C and 35 °C to 50 °C); ±1 % per °C for 20% bands Power


• 12 V lead-acid rechargeable battery


• Battery life: Over 750 tests per charge


• Charger input: 85 V to 250 V AC, 50/60 Hz, 20 VA Memory & Data


• 99 memory locations with user-defined labeling


• Timed test timer: Up to 99 minutes


• PC interface supported; compatible with FlukeView Forms™ Basic (Windows XP, Vista, 7, 8)

Key Features

• Large digital/analog LCD display (75 mm × 105 mm)


• Operating temperature range: −20 °C to 50 °C


• Storage temperature range: −20 °C to 65 °C


• Relative humidity: 80% at 31 °C, decreasing linearly to 50% at 50 °C


• Maximum altitude: 2000 m


• Enclosure sealing: IP40


• Dimensions: 269 mm × 277 mm × 160 mm


• Weight: 3.7 kg


• Supplied with test cables and alligator clips

Typical Applications Switchgear insulation diagnostics, motor and generator condition assessment, power cable integrity verification, and scheduled maintenance programs requiring high-voltage insulation trending.