HIOKI HIGH VOLTAGE INSULATION TESTER IR5050: Maximum 5kV Test Voltage - Up to 10 TΩ of Insulation Resistance Testing.

Maximum 5kV Test Voltage - Up to 10 TΩ of Insulation Resistance Testing.

The IR5050 is a compact, lightweight, high-voltage insulation resistance tester capable of outputting up to 5 kV. Its unique measurement technology enables stable measurements of up to 10 TΩ.

Ideal for high-voltage insulation resistance testing
Best suited for high-voltage insulation resistance testing, the IR5050 is equipped with advanced measurement technology that guarantees stable readings across a range of applications, including high-voltage cables, transformers, and motors. It also features an intuitive rotary knob for straightforward operation, enhancing its versatility and user-friendliness for diverse industrial uses.
Advanced insulation diagnostic features
The IR5050 offers specialized insulation diagnostic functions such as step and ramp voltage testing. It automatically displays results in indices like PI (Polarization Index), DAR (Dielectric Absorption Ratio), and DD (Dielectric Discharge), streamlining the diagnostic process.
Streamlined data management and reporting
Enhancing efficiency, the IR5050 comes with data memory, and options for wireless and USB connectivity. It facilitates real-time graph trending on mobile devices and enables quick report generation, simplifying data handling and documentation.

Key Features

  • Measure insulation of high-voltage equipment (such as transformers, cables, and motors)
  • Wide testing voltage range, up to 5000 V from 250 V DC
  • Wide measurement insulation range, up to 10 TΩ
  • Automatically calculated and displayed insulation diagnostics (PI, DD, and DAR)
  • Data memory functions increase your work efficiency by eliminating human errors from manual reporting.
  • Selectable Interface Compatibility: Offers both wireless and USB connectivity options.
  • Compact and lightweight, equipped with an IP65-rated carrying case

Basic specifications

Accuracy guaranteed: 1 year
Measurement parameters • Insulation resistance
• Leakage current
• Voltage
• Capacitance (DD function)
Max. rated voltage to terminals 1000 V AC, 2000 V DC
Max. rated voltage to ground 1000 V (CAT IV), 600 V (CAT III)
Operating temperature and humidity range -20°C to 50 °C (*1) (no condensation)
Storage temperature and humidity range -25°C to 65°C (-13°F to 149°F), less than 80% RH (no condensation)
Dustproof/waterproof IP40 (with protector attached, excluding terminals)
Standards EN61010 (safety), EN61326 (EMC), IEC 61557-1, IEC 61557-2 (Insulation resistance tester)
Power supply • LR6 (AA) alkaline battery × 8
• HR6 (AA) nickel-metal hydride (NiMH) rechargeable battery × 8
Continuous operating time (*2) Approx. 5 hours without Z3210 installed; approx. 4 hours with Z3210 installed and using wireless communication
Dimensions and weight 195 mm (7.68 in.) W × 254 mm (10 in.) H × 89 mm (3.50 in.) D, 1.7 kg (59.97 oz.) (including batteries)
Included accessories Test lead L9850-01 ×1, Test lead L9850-02 ×1, Test lead L9850-03 ×1, Alligator clip L9851-01 ×1, Alligator clip L9851-02 ×1, Alligator clip L9851-03 ×1, Carrying Case C0212 ×1, LR6 Alkaline battery ×8, Instruction manual ×1, Operating precautions ×1
  • *1:-20°C to 40°C (-4°F to 104°F), less than 80% RH , 40°C to 45°C (104°F to 113°F), less than 60% RH , 45°C to 50°C (113°F to 122°F), less than 50% RH
  • *2:When using alkaline batteries, 5 kV generated, +/- terminals open, backlight off and comparator off


Insulation diagnosis PI, DAR, DD, SV, Ramp, Timer
Others Battery charge indicator, live circuit indicator, automatic power save, automatic discharge, backlight, buzzer, manual recording, logging recording, temperature and humidity input, elapsed time display, clock, filter, hardware filter, data-hold, system reset, USB communication (only when DT4900-01 is installed), wireless communication (only when Z3210 is installed), comparator, resistance gauge display, switching of insulation diagnosis function, breakdown cut-off.

Insulation resistance measurement

Test voltage range DC 250 V to 5.20 kV DC
User-set test voltage 250 V to 1 kV: in 10 V increments; 1 kV to 5 kV: in 25 V increments
Test voltage preset 250 V 500 V 1000 V 2500 V 5000 V
Guaranteed accuracy range (1) 0.00 MΩ〜2.50 GΩ ±5% rdg ±5 dgt 0.00 MΩ〜5.00 GΩ ±5% rdg ±5 dgt 0.00 MΩ〜10.0 GΩ ±5% rdg ±5 dgt 0.00 MΩ〜25.0 GΩ ±5% rdg ±5 dgt 0.00 MΩ〜50.0 GΩ ±5% rdg ±5 dgt
Guaranteed accuracy range (2) 2.51 GΩ〜500 GΩ ±20% rdg 5.01 GΩ〜1.00 TΩ ±20% rdg 10.1 GΩ〜2.00 TΩ ±20% rdg 25.1 GΩ〜5.00 TΩ ±20% rdg 50.1 GΩ〜10.00 TΩ ±20% rdg
Rated current 1 mA to 1.2 mA
Short-circuit current 2 mA or less
Possible number of measurements 200 times or more on one set of fully-charged batteries

Leakage current measurement

Measurement range (auto) 10 nA 100 nA 1000 nA 10 μA 100 μA 1 mA
Display range 0.00 nA to 9.99 nA 9.0 nA to 99.9 nA 90 nA to 999 nA 0.90 μA to 9.99 μA 9.0 μA to 99.9 μA 90 μA to 999 μA (*3)
0.90 mA to 3.00 mA (*4)
Resolution 0.01 nA 0.1 nA 1 nA 0.01 μA 0.1 μA *3: 1 μA
*4: 0.01 mA

Voltage measurement

Guaranteed accuracy range 30 V to 1,000 V AC (45 Hz to 65 Hz), ±10 V to ±2,000 V DC
Accuracy ±3% rdg. ±3 dgt.
Input resistance 500 kΩ or more (DC, 45 Hz to 65 Hz)
Overload protection 1100 V AC (1 min., between +/- terminals)
2200 V DC (1 min., between +/- terminals)

Capacitance measurement

Capacitance is automatically measured after insulation resistance measurement is over (not measured if output voltage is 250 V or less)
Accuracy ±10% rdg. ±5 nF (guaranteed accuracy range: 10.0 nF to 25.0 µF)
Measurement range 100 nF 1000 nF 10 μF
Display range 0.0 nF to 99.9 nF 100 nF to 999 nF 1.00 μF to 9.99 μF (*5)
10.0 μF to 25.0 μF
Resolution 0.1 nF 1 nF *5: 0.01 μF
*6: 0.1 μF