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HIOKI HIGH VOLTAGE INSULATION TESTER IR5051
Measure Solar PV System Insulation Resistance Safely and Accurately While Generating.
Maximum 5kV Test Voltage - Up to 10 TΩ of Insulation Resistance Testing.

The IR5051 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. In addition, the IR5051 is capable of testing the insulation resistance of solar PV systems during power generation, and has a CAT III 2000 V safety rating to allow testing of 2000 V PV systems.

Dedicated Measurement Function

In addition to a normal insulation resistance measurement mode, the IR5051 also features a specialized mode for measuring PV insulation resistance.

Flexible Voltage Range

Effectively measures 1500 V solar PV systems and is prepared to accommodate systems up to 2000 V as technology advances.

Standards Compliance

Complies with IEC 62446-1 for Category 1 and Category 2 tests, ensuring robust safety and performance

Key Features

• Measure solar PV system insulation resistance safely and accurately while generating
• 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 • PV 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) IP65 (CARRYING CASE C0212)
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, Test pin set L9852 ×1, Carrying Case C0212 ×1, LR6 Alkaline battery ×8, Instruction manual ×1, Operating precautions ×1, Wireless adapter Z3210（IR5051-90 only）

• *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

Functions

Insulation diagnosis

PI, DAR, DD, SV, Ramp, Timer (*3)

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, negative voltage notification

• *3:Only for can be set in the PV insulation resistance function

PV insulation resistance

Test voltage range	DC 250 V to 2.00 kV
Test voltage presets	500 V, 1 kV, 1.5 kV
User-set test voltage	250 V to 1 kV: in 10 V increments; 1 kV to 2 kV: in 25 V increments
Test voltage preset	500 V	1000 V	1500 V
Guaranteed accuracy range (1)	0.00 MΩ to 5.00 GΩ ±5% rdg ±5 dgt	0.00 MΩ to 10.00 GΩ ±5% rdg ±5 dgt	0.00 MΩ to 20.0 GΩ ±5% rdg ±5 dgt
Guaranteed accuracy range (2)	5.01 GΩ to 100 GΩ ±20% rdg	10.1 GΩ to 100 GΩ ±20% rdg	20.1 GΩ to 100 GΩ ±20% rdg
Rated current	[Test voltage] / [20 MΩ]
Open-circuit voltage	From 0% to 10% of test voltage
Short-circuit current	2 mA or less
Possible number of measurements	1000 times or more on one set of fully-charged batteries

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 (*4) 0.90 mA to 3.00 mA (*5)
Resolution	0.01 nA	0.1 nA	1 nA	0.01 μA	0.1 μA	*4: 1 μA *5: 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 (*6) 10.0 μF to 25.0 μF (*7)
Resolution	0.1 nF	1 nF	*6: 0.01 μF *7: 0.1 μF