Hioki insulation resistance 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.


■ 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±5 % of indicated value
0.05 to 50 MΩ		±5 % of indicated value
0.05 to 50 MΩ		±5 % of indicated value
2 to 1000 MΩ
Lower limit resistance0.25 MΩ0.5 MΩ1 MΩ

(Measurement resistance value to maintain testing voltage)
Overload protection1200 V AC (10 sec.)
Low resistance3 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 measurement0 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