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Hioki is a leading manufacturer of electrical measuring instruments and test equipment, providing precision solutions for power analysis, battery testing and industrial maintenance. Its portfolio includes digital multimeters, clamp meters, power analysers, battery testers, data loggers and insulation testers. Trusted by engineers, electricians and researchers worldwide, Hioki products support applications in energy, automotive, electronics manufacturing and electrical maintenance.
Digital Insulation Tester with Bar Graph and Bluetooth, 50 V to 1000 V
Digital insulation tester with bar graph display and integrated Bluetooth, 5 test voltages from 50 V to 1000 V, insulation resistance up to 4000 MΩ, PASS/FAIL comparator, 200 mA protective conductor test, operating temperature from -25 °C to 65 °C.
• 5 test voltages from 50 V to 1000 V
• Insulation resistance up to 4000 MΩ
• Safety category CAT III 600 V
• Digital bar graph display
• Integrated Bluetooth communication
• Inspection and maintenance of low-voltage electrical installations
• Troubleshooting insulation faults in wiring, motors, and equipment
• Field testing of machinery, control panels, and distribution boards
• Periodic inspection of plant and equipment
In installation and maintenance work, insulation resistance measurements are routinely carried out when checking wiring, distribution boards, motors, and electrical equipment after repairs or during periodic inspections. For these tasks, a dedicated insulation tester is often the appropriate choice instead of a multifunction installation tester or combined test instrument.
The IR4057-90 consists of the IR4057-50 Insulation Tester and the Z3210 Bluetooth Adapter. The included tester is a digital, battery-powered insulation tester that provides five selectable test voltages from 50 V to 1000 V and measures insulation resistance up to 4000 MΩ. It complies with EN 61557 requirements for insulation resistance and protective conductor continuity testing in low-voltage installations.
Alongside the numeric measurement display, the IR4057-90 includes a digital bar graph for continuous visual indication of insulation resistance during testing. Resistance changes can be observed directly on the scale.
The comparator function evaluates insulation measurements within approximately 0.3 seconds and indicates PASS or FAIL acoustically and visually. In the event of a FAIL result, the display backlight turns red.
PASS/FAIL thresholds can be defined individually for each test voltage. Settings remain stored even after switching the instrument off or selecting another range.
With the comparator function switched off, the instrument instead displays the insulation resistance value after 60 seconds during an ongoing measurement. This supports time-based evaluation when longer test durations are required.
Protective conductor testing is performed with a 200 mA test current in accordance with EN 61557-4. The defined test current applies sufficient load to the protective conductor connection to identify increased contact resistance, loose terminals, and oxidized connections. This provides a more reliable assessment than a low-current continuity check performed with a standard digital multimeter.
The instrument also includes AC and DC voltage measurement up to 600 V, allowing verification that the test object is not live before insulation testing.
For added safety, the 500 V and 1000 V test voltages must be manually unlocked before the first measurement. This prevents accidental activation of higher test voltage levels.
The IR4057-90 complies with CAT III 600 V and has been tested for a 1 m drop onto concrete. It is specified for operation in ambient temperatures from -25 °C to 65 °C.
The instrument is integrated into a protective hard case that forms a single unit and provides storage space for test leads and accessories. Test leads remain connected during transport.
The high-contrast display with backlight supports work in distribution boards and poorly lit technical rooms. An optional L9788-10 Test Lead with integrated LED illumination and measurement trigger allows measurements to be started directly from the probe.
With the included Z3210 Bluetooth Adapter, measurement data can be transferred directly to the free GENNECT Cross app on iOS or Android devices. Results can be stored wirelessly and exported as structured reports, reducing manual documentation effort during installation and maintenance.
Like all HIOKI insulation testers, the IR4057-90 is designed and manufactured in Japan at HIOKI’s own production facilities in Nagano Prefecture.
• IR4057-50 Digital Insulation Tester
• Z3210 Bluetooth Adapter
• L9787 Test Lead Set
• Neck Strap
• Instruction Manual
• 4 × LR6 (AA) Alkaline Batteries
• L9788-10 Remote Switch Test Lead
• L9788-92 Insulated Extension Pin
• IR4059 Digital Insulation Tester
• IR4057-50 Digital Insulation Tester
• IR4056 Digital Insulation Tester
• IR4053 Digital Insulation Tester
• IR5051-90 High Voltage Insulation Tester
• IR5051 High Voltage Insulation Tester
• IR5050 High Voltage Insulation Tester
• 3490 Analog Insulation Tester
• 9804-02 Magnetic Adapter
• L9787-91 Insulated Extension Pin
