Hioki 3490 Analog MΩ HiTester

The 3490 Analog MΩ HiTester is designed for hands-on insulation testing in electrical maintenance, inspections, and troubleshooting. It provides three DC output voltages (250 V, 500 V, and 1000 V) allowing it to cover a wide span of insulation resistance measurements. On the lower voltage settings (250 V / 500 V), it can measure up to about 100 MΩ; at 1000 V it extends up to several thousand MΩ.

Beyond insulation resistance, the instrument includes a continuity (low-resistance) test mode, applying a current (typically 200 mA) to verify conductor connectivity or grounding paths. The analog scale is backlit by a white LED to ensure readability even in dim environments. A live-circuit indicator alerts the user if the circuit under test is still energized (above a threshold).

The unit is ruggedly built to survive field use — drop resistant (1 m onto concrete) and capable of withstanding typical site conditions. The rotary function switch includes off-positions between voltage settings to reduce the chance of accidental voltage application. Battery status and live circuit indicators help prevent unexpected interruptions or safety hazards.

Altogether, the 3490 is a straightforward, reliable analog insulation tester suited for many electrical inspection tasks where digital readouts are not required but robustness and clarity are valued.

Features

• Three Test Voltages — 250 V, 500 V, and 1000 V DC selectable to match insulation test requirements.
• High Insulation Resistance Range — Up to ~100 MΩ on lower voltages, and up to ~4000 MΩ on the 1000 V setting.
• Continuity Test Mode — Low-resistance test ranges (3 Ω and 30 Ω) using ~200 mA current for checking connections and ground paths.
• Illuminated Analog Scale — White LED lighting behind the scale ensures readability in low-light field conditions.
• Live-Circuit Detection — Red LED indicator lights if voltage remains present between test terminals, warning operator.
• Robust Construction — Drop-proof from 1 m onto concrete, designed for industrial site use.
• Safety-Oriented Switch Design — The rotary function switch includes “OFF” gaps between voltage ranges to avoid mis-selection.
• Battery Status Monitoring — LED indication of battery level to warn before power fails mid-measurement.
• Auto Discharge Protection — Automatically discharges the device under test after measurement to avoid lingering high voltage.
• AC Voltage Measurement — Capability to measure up to 600 V AC (50/60 Hz) as part of its multi-function utility.

Includes

• Test lead L9787 ×1
• Instruction manual ×1
• Shoulder strap ×1
• LR6 (AA) alkaline batteries ×4