HIOKI IR5051 High Voltage Insulation Tester

HIOKI IR5051 High Voltage Insulation Tester | 5kV Digital Megohmmeter for PV & Industrial Systems

Powerful 250V-5kV Insulation Resistance Testing with PV Function in Sri Lanka

The HIOKI IR5051 is a compact, high-voltage digital insulation tester delivering up to 5 kV test output and 10 TΩ measurement range for precise insulation resistance testing of transformers, cables, motors, and solar PV systems. Featuring dedicated PV insulation mode for live power generation testing up to 2000 V, automatic PI/DAR/DD diagnostics, and CAT III 2000 V / CAT IV 1000 V safety, it excels in demanding industrial and renewable energy applications across Sri Lanka. With wireless/USB data logging and IP65-rated carrying case, the IR5051 ensures reliable field performance and seamless compliance reporting for electrical professionals.

Engineered for safety during energized PV testing and high-voltage equipment diagnostics, the HIOKI IR5051 offers adjustable output from 250 V to 5000 V in fine increments, automatic AC/DC voltage detection up to 2000 V DC, and capacitance measurement for comprehensive insulation analysis. Its intuitive rotary knob, large backlit display with resistance gauge, and robust construction (drop-proof, lightweight at ~2.3 kg) make it ideal for solar farms, power plants, and heavy industry maintenance in Sri Lanka's challenging environments. Streamline preventive maintenance and IEC 62446-1 compliance with this advanced insulation resistance tester that combines precision, portability, and smart connectivity.

Key Features of the HIOKI IR5051 High Voltage Insulation Tester

Ultra-High 5 kV Test Voltage & 10 TΩ Range

Delivers selectable DC output from 250 V to 5000 V (10/25 V steps) with insulation resistance measurement up to 10 TΩ, perfect for high-voltage cables, transformers, and rotating machinery.

Dedicated PV Insulation Testing Mode

Specialized function measures PV system insulation up to 2000 V even during power generation, complying with IEC 62446-1 Category 1/2 tests for solar installations.

Automatic Insulation Diagnostics

Built-in calculation and display of PI (Polarization Index), DAR (Dielectric Absorption Ratio), DD (Dielectric Discharge), plus SV, Ramp, and Timer modes for comprehensive insulation health assessment.

Wireless & USB Data Connectivity

Supports data memory, manual/logging recording, and transfer via Wireless Adapter Z3210 or USB (with DT4900-01), eliminating manual errors and enabling efficient reporting to Excel or apps.

High-Voltage AC/DC Measurement

Measures up to 1000 V AC / 2000 V DC with auto AC/DC detection, plus leakage current and capacitance (10 nF to 25 µF) for complete circuit analysis before insulation testing.

Robust Field Construction

Compact design (195 x 254 x 89 mm) with IP65-rated carrying case, 1000+ measurements per battery charge, auto-discharge, live circuit indicator, and breakdown cut-off for maximum safety.

Precision Resistance Gauge Display

Features large backlit LCD with analog-style resistance gauge, filter functions, and comparator for instant PASS/FAIL judgment during high-voltage testing operations.

Advanced Safety Ratings

Rated CAT III 2000 V / CAT IV 1000 V to ground, with 1100 V AC / 2200 V DC overload protection, ensuring safe operation on live PV arrays and industrial high-voltage systems.

Extended Measurement Capabilities

Short-circuit current ≤2 mA, temperature/humidity input, elapsed time display, and negative voltage notification for professional-grade accuracy in diverse testing scenarios.

Common Applications for HIOKI IR5051 in Sri Lanka

This high voltage insulation resistance tester is purpose-built for:

Solar PV System Insulation Verification

Tests insulation resistance of energized PV strings, modules, and 1500-2000 V systems without shutdown, supporting Sri Lanka's growing solar power infrastructure and IEC compliance.

High-Voltage Industrial Equipment

Evaluates insulation in transformers, large motors, generators, switchgear, and long power cables in factories, power stations, and transmission networks to prevent failures.

Power Distribution & Cable Testing

Conducts preventive maintenance on medium/high-voltage cables, overhead lines, and substations with PI/DAR analysis for early degradation detection and reliability.

Compliance & Certification Testing

Provides documented proof for electrical installations, renewable energy projects, and industrial audits with data logging and diagnostic reporting features.

Technical Specifications of the HIOKI IR5051

Insulation Test Voltages

250 V to 5000 V DC (adjustable in 10 V / 25 V increments); PV mode: 250 V to 2000 V DC.

Insulation Resistance Ranges

Up to 10 TΩ (general mode); PV mode up to 100 GΩ; short-circuit current ≤2 mA; 1000+ measurements per charge.

Measurement Accuracy

±3% rdg. ±3 dgt. typical (primary ranges); guaranteed accuracy to 100 GΩ with ±20% rdg. in extended high-resistance areas.

Voltage Measurement

30 V to 1000 V AC (45-65 Hz), ±10 V to 2000 V DC; auto AC/DC detection; input resistance ≥500 kΩ.

Capacitance Measurement

10 nF to 25 µF (±10% rdg. ±5 nF) for DD function across 100 nF / 1 µF / 10 µF ranges.

Diagnostic Functions

PI, DAR, DD, SV, Ramp, Timer; comparator, filter, breakdown detection, auto power save.

Safety & Overload

CAT III 2000 V / CAT IV 1000 V; overload: 1100 V AC / 2200 V DC (1 min.).

Power Source

Rechargeable Li-ion battery; USB/wireless communication options.

What's in the Box?

1 x HIOKI IR5051 High Voltage Insulation Tester

1 x IP65-Rated Carrying Case

1 x High-Voltage Test Leads (e.g., L4204)

1 x Alligator Clips

1 x USB Cable

1 x AC Adapter / Charger

1 x Rechargeable Li-ion Battery

1 x Strap

1 x Instruction Manual

Downloads

📄 Download HIOKI IR5051 Data Sheet

📄 Download HIOKI IR5051 User Manual