FLUKE 1537 Insulation Tester

Fluke 1537 Insulation Tester | Advanced 2500V Digital Megohmmeter for Industrial & Solar Testing

Professional Insulation Resistance Testing with PI/DAR Analysis in Sri Lanka

The Fluke 1537 is a rugged, high-performance digital insulation tester delivering precise insulation resistance measurement up to 2500V and 500 GΩ for demanding industrial, solar PV, and electrical maintenance applications in Sri Lanka. Featuring selectable test voltages from 250V to 2500V in 100V increments, automatic PI/DAR calculations, and high 5mA short-circuit current for stable readings, it's ideal for electricians, maintenance engineers, and solar technicians requiring reliable diagnostics and compliance verification. With CAT IV 600V safety rating, live voltage alarm, and over 1300 tests per charge, the Fluke 1537 ensures field-ready performance in harsh environments.

Engineered for comprehensive electrical testing, the Fluke 1537 combines insulation resistance testing with AC/DC voltage (up to 1000V) and low-resistance measurements, plus timed PI/DAR tests (1, 10, and 30 minutes) for complete insulation health assessment. Its large backlit LCD display, rugged IP40 housing with 1m drop protection, and intuitive one-button operation make it perfect for preventive maintenance on motors, cables, transformers, and PV systems across Sri Lanka's industrial and renewable energy sectors. Streamline troubleshooting and certification with this trusted Fluke insulation resistance tester built for professional reliability.

Key Features of the Fluke 1537 Insulation Tester

Wide 250V-2500V Test Voltage Range

Selectable test voltages in 100V increments: 250V, 500V, 1000V, 1500V, 2500V with insulation resistance measurement up to 500 GΩ for versatile cable, motor, and equipment testing.

High 5mA Short-Circuit Current

Powerful 5mA test current ensures fast, stable insulation measurements even on large capacitive loads like transformers and long cables, reducing test time significantly.

Automatic PI/DAR Calculations

Built-in Polarization Index (PI) and Dielectric Absorption Ratio (DAR) calculations with 1, 10, and 30-minute timed tests for comprehensive insulation degradation analysis.

Multi-Function Measurements

Includes AC/DC voltage measurement up to 1000V, low-resistance testing (0.01Ω to 1kΩ), and live circuit voltage detection for complete electrical system diagnostics.

Live Voltage Alarm & Auto-Discharge

Automatic voltage detection with audible/visual alarm prevents testing on live circuits; auto-discharge function safely removes residual charge after insulation tests.

High-Capacity Battery Performance

Rechargeable Li-ion battery delivers over 1300 insulation tests per charge, with low battery indicator and multiple power-saving modes for extended field use.

Rugged Field-Ready Design

IP40-rated housing with 1m drop protection, ergonomic rubber holster, and large backlit LCD display readable in all lighting conditions for demanding work sites.

Precision Comparator Function

Programmable PASS/FAIL thresholds with visual/audible indicators streamline go/no-go testing during acceptance, maintenance, and quality control inspections.

Enhanced CAT IV Safety

CAT IV 600V / CAT III 1000V safety rating with 2x safety shutter design protects operators during testing in industrial distribution systems and substations.

Common Applications for Fluke 1537 in Sri Lanka

This advanced insulation resistance tester is purpose-built for:

Industrial Motor & Generator Maintenance

Comprehensive insulation testing of AC/DC motors, generators, and rotating equipment using PI/DAR analysis to predict failures and schedule preventive maintenance.

Solar PV System Commissioning

Verifies insulation quality in PV strings, inverters, and DC cabling during installation and annual maintenance, ensuring compliance with IEC standards and safety requirements.

Power Cable & Transformer Testing

Tests medium-voltage cables, distribution transformers, and switchgear insulation integrity, identifying degradation before costly failures disrupt operations.

Electrical Installation Certification

Provides documented proof of insulation resistance for building handovers, factory acceptance tests, and regulatory compliance inspections across commercial facilities.

Technical Specifications of the Fluke 1537

Insulation Test Voltages

250V, 500V, 1000V, 1500V, 2500V DC (selectable in 100V steps); short-circuit current 5mA.

Insulation Resistance Ranges

Up to 500 GΩ (250V/500V); 200 GΩ (1000V); 100 GΩ (1500V); 50 GΩ (2500V) with 4-range detection.

Test Accuracy

±(1.5% rdg + 3 dgt) typical across primary ranges; high accuracy maintained across full measurement span.

Voltage Measurement

0-1000V AC/DC (±2% rdg + 3 dgt); auto-ranging with live circuit detection threshold at 30V.

Low Resistance Range

0.01Ω to 1999Ω with 1mA test current for continuity and bonding verification.

PI/DAR Timed Tests

1 min/10 min for DAR, 10 min for PI; automatic calculation and display of insulation quality ratios.

Display & Resolution

Backlit LCD with 0.01 MΩ resolution to 999.9 MΩ; analog bar graph for trending.

Safety & Durability

CAT IV 600V / CAT III 1000V; IP40 rating; 1m drop test; operating temp -20°C to 50°C.

Power Source

Rechargeable Li-ion battery; >1300 tests per charge; USB charging capability.

What's in the Box?

1 x Fluke 1537 Insulation Resistance Tester

1 x AC Charging Adapter

1 x Heavy-duty Test Leads with Alligator Clips

1 x Remote Test Probe

1 x Protective Rubber Holster

1 x Rechargeable Li-ion Battery (installed)

1 x USB Charging Cable

1 x User Manual & Quick Reference Guide

Downloads

📄 Download Fluke 1537 Data Sheet

📄 Download Fluke 1537 User Manual