Insulation resistance tester HZ3051

for electrical installationsfor electrical equipmentdiagnostic

Overview
The Insulation Resistance Tester is used in electrical engineering to assess the insulation quality of equipment for preventive maintenance, commissioning and field diagnostics. Designed for portable field use, it supports adjustable test voltages, multiple test modes and data recording to help locate insulation weaknesses and reduce downtime.

Main device control and operation
The instrument is controlled by a single-chip microcomputer and includes automatic discharge functions. It delivers precise measurements with simple operation and is optimized for fast transformer and equipment testing in field environments.

Key features

• 5-inch industrial color LCD, resolution 800×480.
• Six fixed test voltages: 100 V, 250 V, 500 V, 1000 V, 2500 V, 5000 V; custom mode 50 V–5000 V adjustable in 10 V steps (long press switches to 50 V step for faster adjustment).
• Adjustable short-circuit output current 1–6 mA (1 mA steps); max 6 mA.
• Maximum continuous output power 27 W.
• Independent discharge circuit for fast and safe discharge after testing.
• Breakdown protection and continuous arcing mode to locate weak insulation points.
• Supported tests: Insulation Resistance (IR), Dielectric Absorption Ratio (DAR), Polarization Index (PI), Step Voltage (SV); DAR calculation modes: R60s/R30s and R60s/R15s.
• Built-in AC/DC voltmeter with automatic DC/AC detection and AC frequency measurement.
• Hardware and configurable software filters for improved interference immunity.
• Individual test-time storage per mode and configurable auto-shutdown on idle or low battery.
• Standard large-capacity 16.8 V 3200 mAh lithium battery with built-in fast charger; replaceable battery box and charging/battery status indication on panel and LCD.

Packing list (included items)

• Main tester: 1 pc
• Test leads: 1 set (red high-voltage lead, blue shielded protection lead, black high-voltage lead)
• Three-core power cord: 2 pcs
• User manual: 2 pcs
• Warranty card: 1 pc
• Test report: 1 pc

Technical specifications

• Insulation resistance measurement ranges and example resolutions at 5 kV: 0–9.99 kΩ (0.01 kΩ); 10.0–99.9 kΩ (0.1 kΩ); 100–999 kΩ (1 kΩ); 1.00–9.99 MΩ (10 kΩ); 10.0–99.9 MΩ (100 kΩ); 100–999 MΩ (1 MΩ); 1.00–9.99 GΩ (10 MΩ); 10.0–99.9 GΩ (100 MΩ); 100–999 GΩ (1 GΩ); 1.00–2.00 TΩ (10 GΩ).
• Full-scale resistance examples per test voltage: 100 V → 40 GΩ; 250 V → 100 GΩ; 500 V → 200 GΩ; 1000 V → 400 GΩ; 2500 V → 1.00 TΩ; 5000 V → 2.00 TΩ.
• Test time: adjustable 1–60 minutes, 30 s step.
• Fixed test voltages: 100 V, 250 V, 500 V, 1000 V, 2500 V, 5000 V; self-defined: 50 V–5000 V, min step 10 V (long press switches to 50 V step).
• Voltage output accuracy: 0% ~ +10%; short-circuit current accuracy ±5%.
• Voltmeter range AC/DC 10 V–660 V, accuracy ±(2%+3); AC frequency 25–85 Hz, resolution 0.1 Hz, accuracy ±0.2 Hz.
• Capacitance measurement 10 nF–25 µF (test voltage ≥100 V), accuracy ±10% ±5 nF; discharge rate at 5 kV → 50 V: ≤0.47 s/µF.
• Power supply AC 85–264 Vrms, 50/60 Hz, 25 VA; built-in battery 16.8 V 3200 mAh; charger 16.8 V 1.5 A; example battery runtime 5 kV @100 MΩ ≈ 6 h.
• Dimensions 320 × 270 × 150 mm; weight ≈ 2.9 kg; operating temperature -10 °C to 50 °C; relative humidity ≤90% (no condensation).