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  • Digital Insulation Testers, 5-range IR4058

Quick Response Comparator Offering Reading Stability in High-speed Digital Format

Hioki insulation testers or megohmmeters feature all-in-one designs including built-in rugged cases and test lead storage compartments. The IR4058 is a 5-range, 50V to 1000V digital insulation resistance tester with bargraph, and delivers efficient functions and features to help shorten work time associated with field insulation testing. CAT III 600 V

Key Features

• Measured values held on the display are sent immediately to a smartphone or tablet via Bluetooth® Smart technology (IR4058)

• 5-range testing voltage of 50 V/100 MΩ to 1000 V/4000 MΩ

• Digital bar graph

• Stable & high-speed digital readings, 0.3 second response time for PASS/ FAIL decisions

• Drop proof onto concrete from 1m (3.28 feet)

• Bright LED, luminous LCD, test lead with bright LED lamp to illuminate near hand (Option L9788-11 or L9788-10)

• Continuity check via 200 mA testing

• Built in AC/DC voltage meter, useful for testing solar power generation systems and electric vehicles


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

Rated output voltage50 V DC125 V DC250 V DC500 V DC1000 V DC
Effective maximum indicated value100 MΩ250 MΩ500 MΩ2000 MΩ4000 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 resistance0.05 MΩ0.125 MΩ0.25 MΩ0.5 MΩ1 MΩ
Overload protection600 V AC (10s)660 V AC (10s)
DC voltage range4.2 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 range420 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 rangeFor 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)
DisplaySemi-transmissive FSTN LCD with back lighting, bar-graph indicator
Response timeApprox. 0.3 second for PASS/FAIL decision (based on in-house testing)
Other functionsIndicate MΩ measurement value after a lapse of one minute, Live circuit indicator, Automatic electric discharge, Automatic DC/AC detection, Comparator, Drop proof, Auto power save
Interface (IR4058 only)Bluetooth® 4.0LE (Bluetooth® SMART), Supported devices: iOS 8 or later, Android™ 4.3 or later smartphone/tablet
GENNECT Cross (free downloadable app) : display measured values, Simple logging function, Hold save function
Power supplyLR6 (AA) alkaline batteries × 4, Continuous use: 20 hours (based on in-house testing), 10 hours (Bluetooth® ON)
Dimensions and mass159 mm (6.26 in)W × 177 mm (6.97 in)H× 53 mm (2.09 in)D, 640 g (22.6 oz) (including batteries, excluding test leads)
AccessoriesTest lead L9787 ×1, Neck strap ×1, Instruction manual ×1, LR6 (AA) alkaline batteries ×4


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Digital Insulation Testers, 5-range IR4058

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