Hioki Insulation Tester IR4056

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HIOKI IR4056-20 is a 5-range digital insulation tester enables faster insulation testing owing to its advanced features and efficient function.

  • 5-range testing voltage of 50v to 1000v
  • Stable & medium speed digital readings
  • AC/DC automatic detection
  • Auto power save
  • Drop proof
Rated output voltage

50 V DC, 125 V DC, 250 V DC, 500 V DC, 1000 V DC

Effective maximum indicated value

100 MΩ, 250 MΩ, 500 MΩ, 2000 MΩ, 4000 MΩ

Accuracy 1st effective measuring range MΩ

±2 % rdg. ±2 dgt. 0.200 – 10.00
±2 % rdg. ±2 dgt. 0.200 – 25.0
±2 % rdg. ±2 dgt. 0.200 – 50.0
±2 % rdg. ±2 dgt. 0.200 – 500
±2 % rdg. ±2 dgt. 0.200 – 1000

Lower limit resistance

0.05 MΩ, 0.125 MΩ, 0.25 MΩ, 0.5 MΩ, 1 MΩ

Overload protection

600 V AC (10s), 660 V AC (10s)

DC voltage range

4.2 V (0.001 V resolution) to 600 V (1 V resolution), 4 ranges,
Accuracy: ±1.3 % rdg. ±4 dgt., Input resistance: 100 kΩ or higher

AC voltage range

420 V (0.1 V resolution) / 600 V (1 V resolution), 2 ranges, 50/60 Hz,
Accuracy: ±2.3% rdg. ±8 dgt., Input resistance: 100 kΩ or higher, Average rectifier

Low resistance range

For checking the continuity of ground wiring, 10 Ω (0.01 Ω resolution) to 1000 Ω (1 Ω resolution), 3 ranges, Basic accuracy: ±3 % rdg. ±2 dgt., testing current 200 mA or more (at 6 Ω or less)

Display

Semi-transmissive FSTN LCD with back lighting, bar-graph indicator

Response time

Approx. 0.8 second for PASS/FAIL decision (based on in-house testing)

Other functions

Live circuit indicator, Automatic electric discharge, Automatic DC/AC detection, Comparator, Drop proof, Auto power save

Power supply

LR6 (AA) alkaline batteries ×4, Continuous use: 20 hours (Comparator off, backlight off, 500 V range, no load)
Number of measurements: 1000 times (at 5 s ON, 25 s OFF cycle, insulation measurement of lower limit resistance value to maintain nominal output voltage)

Dimensions and mass

159 mm (6.26 in) W × 177 mm (6.97 in) H× 53 mm (2.09 in) D, 600 g (21.2 oz) (including batteries, excluding test leads)

Included accessories

[IR4056-20] Test lead L9787 ×1, Neck strap ×1, Instruction manual ×1, LR6 (AA) alkaline batteries ×4
[IR4056-21] Test lead set with remote switch L9788-11 ×1, Neck strap ×1, Instruction manual ×1, LR6 (AA) alkaline batteries ×4

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