3-Range, 250 to 1000V Analog Insulation Tester with Continuity Check

Hioki insulation testers or megohmmeters feature all-in-one designs including built-in rugged cases and test lead storage compartments. The 3490 is a 3-range, 250/500/1000V analog insulation resistance meter with efficient functions and features to help shorten work time associated with field insulation testing. CAT III 600 V Key Features • 3-range testing voltage of 250/500 V (insulation resistance testing up to 100 MΩ), and 1000 V (insulation testing up to 4000 MΩ) • Continuity check at 3 Ω range via 200 mA testing • Bright LED luminous scale • Check for live circuits and battery status

Model No. (Order Code)

3490 Bundled with standard Test Lead L9787


3-range 250V・500V/1000MΩ 1000V/2000MΩ, easy-to-read scale for insulation resistance values

Robust, damage-resistant design

These instruments feature a robust design that can withstand being dropped onto concrete from a height of 1 m. Difficult to damage, this insulation tester is ideal for use in the field.

White LED lighting that’s easy to read in dim locations in the field

The scale is lit by a white LED, ensuring that insulation resistance values are easy to read, even when using the instrument in a dim location.

Continuous monitoring of battery life

You can keep track of remaining battery life since it’s shown on the LED, eliminating the need to worry about sudden loss of battery power in the field.

Measurement switch designed for outstanding ease of use

The instrument’s measurement switch can be operated with just the thumb. Press for a single measurement or lift up for continuous measurement of insulation resistance.

Remote control to start and stop insulation resistance measurement from the leads

By using switch-equipped measurement leads, you can start and stop insulation resistance measurement remotely. There’s also a handy light for improved convenience when working in dim locations.

Function rotary switch designed for maximum safety

This insulation tester has voltages grouped by application with an “OFF” position between them to help keep users from inadvertently applying the wrong voltage.

Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year)

Rated output voltage250 V DC500 V DC1000 V DC
Effective maximum indicated value100 MΩ100 MΩ4000 MΩ
Accuracy 1st effective measuring range±2 % of scale length
0.05 to 50 MΩ
±2 % of scale length
0.05 to 50 MΩ
±2 % of scale length
2 to 1000 MΩ
Lower limit resistance0.25 MΩ0.5 MΩ1 MΩ
(Measurement resistance value to maintain testing voltage)
Overload protection660 V AC (10 sec.)
Low resistance range3 Ω (at 200 mA testing current), ±0.09 Ω accuracy,
30 Ω (at 20 mA testing current), ±0.9 Ω accuracy,
Open-circuit voltage: 4.1 to 6.9 V
AC voltage range0 to 600 V (50/60 Hz), ±5 % of maximum scale value accuracy,
100 kΩ or more input resistance
Other functionsBright LED luminous scale, Drop proof (on concrete, 1 m/1 time), Battery check, Live circuit check, Auto discharge
Power supplyLR6 (AA) alkaline batteries ×4, Continuous use: 20 hours (at 500 V range, no load)
Dimensions and mass159 mm (6.26 in)W × 177 mm (6.97 in)H × 53 mm (2.09 in)D, 610 g (21.5 oz), (including battery, excluding test lead)
AccessoriesTest lead L9787 ×1, Instruction manual ×1, Shoulder strap ×1, LR6 (AA) alkaline batteries ×4

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Seminar Videos On Demand

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Seminar Schedule

Registration Open

BIXPO 2019 - Gwangju, Korea

Nov 6, 2019 - Nov 8, 2019

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ENTECH 2019 - Busan, Korea

Sep 18, 2019 - Sep 20, 2019

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FISUEL GAM 2019 - Beirut, Lebanon

Apr 29, 2019 - May 2, 2019

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Global Electric Power Tech 2019 - Seoul, Korea

May 29, 2019 - May 31, 2019


Catalog: ANALOG MΩ HiTESTER SERIES IR4016, IR4017, IR4018, 3490 Download PDF  [1MB] English
Catalog: ANALOG MΩ HiTESTER 3490 Download PDF  [1MB] English

User Guides

Insulation Tester series selection guide Download PDF  [290KB] English


If you can not download, log into your myHioki account to access more technical documents and information where available.

Instruction Manual English
Instruction Manual French

Outline Drawings

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Technical Notes

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Declaration of Conformity


Drivers, Firmware

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L9787 options

Exclusively for the L9787 *The L9787 is bundled


Bundled with alligator clip, 1.2 m (3.94 ft) length


For checking breaker terminal, Detachable for tip of the L9787, 48 mm (1.89 in) length, φ 2.6 mm (0.10 in)

L9788 options

Exclusively for the L9788-10/ L9788-11


Lighting LED lamp & comparator indicator (Operate only when main unit provides a comparator function), 1.2 m (3.94 ft) length


Bundled with Test Lead with Remote Switch L9788-10/ Earth lead, alligator clip, 1.2 m (3.94 ft) length

TIP PIN L9788-90

Spare parts for tip of the L9788/ L9788-10, Tip length 35 mm (1.38 in)/φ 3.2 mm (0.13 in)


For checking breaker terminal, Detachable for tip of the L9788-10, 65 mm (2.56 in) length, φ 2.6 mm (0.10 in)

Shared option


Attaches to the tip of cord, black ×1, φ11 mm (0.43 in)



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