INSULATION TESTER
IR4056
Our Most Popular Model Offering Reading Stability in Medium-speed Digital Format
Hioki insulation testers or megohmmeters feature all-in-one designs including built-in rugged cases and test lead storage compartments. The IR4056 is a 5-range, 50V to 1000V digital insulation resistance tester with efficient functions and features to help shorten work time associated with field insulation testing. CAT III 600 V Key Features • 5-range testing voltage of 50 V/100 MΩ to 1000 V/4000 MΩ • Stable & medium-speed digital readings, 0.8 second response time of 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 (Also available in the IR4056-21) • Continuity check via 200 mA testing • Built in AC/DC voltage meter, useful for testing solar power generation systems and electric vehicles
IR4056-20 | Economic model |
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IR4056-21 | Economic model, Not CE marked |
Compare measured values to pre-set reference values to generate a pass or fail judgment with the Comparator function. (also pair with insulation resistance measurement and low-resistance measurement) The insulation testers give you pass/ fail results using a beeping sound, LCD light, and indication right on the test lead with remote control switch*, letting you check for insulation integrity without needing to look at the instrument. (*Standard with the IR4056-21) The image is IR4057
Rated output voltage | 50 V DC | 125 V DC | 250 V DC | 500 V DC | 1000 V DC |
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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) | ||||
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 |
Log into your myHioki account to access more technical documents and information where available.
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Catalog: INSULATION TESTER Series | Download PDF [3MB] |
English |
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 |
Ver.05 | |
INSULATION TESTER IR4054-11,IR4056-20,IR4056-21,IR4057-20,IR4058-20 [8MB] |
Instruction Manual |
Korean |
Ver.00 |
INSULATION TESTER IR4055-11,IR4056-20,IR4056-21,IR4057-20,IR4058-20 [4MB] |
Instruction Manual |
English |
Ver.03 |
Instruction Manual |
Simplified Chinese |
Ver.05 | |
Instruction Manual |
French |
Ver.02 | |
Instruction Manual |
German |
Ver.02 | |
INSULATION TESTER IR4053-10,IR4056-20,IR4056-21,IR4057-50 [5MB] |
Instruction Manual |
Simplified Chinese |
Ver.00 |
INSULATION TESTER IR4053-10, IR4055-11, IR4056-20, IR4056-21, IR4057-50 [5MB] |
Instruction Manual |
English |
Ver.00 |
INSULATION TESTER IR4051-10,IR4052-50,IR4052-51,IR4053-10,IR4056-20,IR4056-21,IR4057-50 [4MB] |
Instruction Manual |
Korean |
Ver.00 |
Instruction Manual |
French |
Ver.00 | |
Instruction Manual |
German |
Ver.00 |
If you can not download, log into your myHioki account to access more technical documents and information where available.
INSULATION TESTER IR4056-20 [284KB] |
Ver.04 |
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Ver.06 |
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Exclusively for the L9787 *The L9787 is bundled (IR4056-20)
TEST LEAD L9787
Bundled with alligator clip, 1.2 m (3.94 ft) length
BREAKER PIN L9787-91
For checking breaker terminal, Detachable for tip of the L9787, 48 mm (1.89 in) length, φ 2.6 mm (0.10 in)
Exclusively for the L9788-10/ L9788-11 *The L9788-11 is bundled (IR4056-21)
TEST LEAD WITH REMOTE SWITCH (RED) L9788-10
Lighting LED lamp & comparator indicator (Operate only when main unit provides a comparator function), 1.2 m (3.94 ft) length
TEST LEAD SET WITH REMOTE SWITCH L9788-11
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)
BREAKER PIN L9788-92
For checking breaker terminal, Detachable for tip of the L9788-10, 65 mm (2.56 in) length, φ 2.6 mm (0.10 in)
MAGNETIC ADAPTER 9804-02
Attaches to the tip of cord, black ×1, φ11 mm (0.43 in)