Description
The Hioki IR5051 High Voltage Insulation Tester delivers precision and safety in testing insulation resistance for solar PV systems, transformers, and high-voltage equipment. Designed for demanding industrial environments, it enables accurate measurements even when solar systems are generating, reducing downtime and boosting field productivity.
High-performance insulation testing for PV systems
Engineered for modern solar installations, the IR5051 can safely measure insulation resistance in systems up to 2000 V DC. Its dedicated PV mode complies with IEC 62446-1 standards, ensuring accurate Category 1 and 2 testing. The device’s advanced insulation diagnostic features automatically calculate PI (Polarization Index), DAR (Dielectric Absorption Ratio), and DD (Dielectric Discharge), allowing professionals to identify faults quickly.
Precision and ease of use
The IR5051 features a flexible voltage range from 250 V to 5000 V, accommodating a wide variety of testing needs. Its intuitive rotary knob simplifies operation, while the large display ensures readings are easy to interpret even in challenging conditions. The tester’s innovative technology ensures stable readings up to 10 TΩ, minimizing environmental interference.
Smart connectivity and safety
With optional Bluetooth® wireless and USB connectivity, users can transfer real-time measurements directly to smartphones or PCs using GENNECT Cross software. This makes data management and report creation fast and efficient. Safety is also a priority — the IR5051 automatically discharges voltage after each test and flashes an indicator during high-voltage output, ensuring user protection.
Built for field reliability
Compact yet rugged, the tester comes with an IP65-rated carrying case, making it suitable for outdoor or dusty environments. Its long-lasting battery life and durable construction make it ideal for field engineers who demand accuracy, safety, and portability in one reliable tool.
Technical Specifications
| Parameter | Details |
| Test Voltage Range | 250 V to 5 kV DC |
| PV Test Voltage Range | 250 V to 2000 V DC |
| Insulation Resistance Range | Up to 10 TΩ |
| Safety Rating | CAT III 2000 V, CAT IV 1000 V |
| Diagnostic Functions | PI, DAR, DD, Ramp, Timer |
| Connectivity | Wireless (Z3210) / USB |
| Dust/Water Protection | IP65 with carrying case |
| Power Supply | 8 × AA batteries (alkaline or NiMH) |
| Weight | Approx. 1.7 kg |
| Dimensions | 195 × 254 × 89 mm |
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