Digital Insulation Tester, Megohmmeter

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 Excluding IR4056-21 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

Model No. (Order Code)

IR4056-20	Economic model
IR4056-21	Economic model, Not CE marked

Product Video

How to Use Digital Insulation Resistance Meters - Basic Course

This video explains how to use a digital insulation resistance tester to measure a distribution panel. ※ Shooting was done with Japanese model IR 4052. The global model name is IR 4057.

Comparator function provides PASS/ FAIL decisions at a glance

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

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. *The image is IR 4057

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.

200 mA grounding line continuity check function

The Insulation testers can perform EV and HEV continuity checks as well as resistance measurement of safety conductors in building electrical equipment as defined by IEC 60364.

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

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 measurement	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 measurement	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 measurement	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

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Seminar Videos On Demand

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Catalogs

Catalog: INSULATION TESTER IR4056, IR4057, IR4058

Download PDF [2MB]

English

User Guides

Insulation Tester series selection guide

Download PDF [290KB]

English

Manuals

INSULATION TESTER IR4056-20,IR4057-20 [5MB]		French	Ver.01
INSULATION TESTER IR4056-20,IR4057-20 [4MB]	Instruction Manual	German	Ver.01
INSULATION TESTER IR4056-20,IR4057-20 [2MB]	Instruction Manual	Simplified Chinese	Ver.04
INSULATION TESTER IR4056-20,IR4057-20 [2MB]	Instruction Manual	English	Ver.05
INSULATION TESTER IR4056-20,IR4056-21,IR4057-20,IR4058-20 [3MB]	Instruction Manual	Korean	Ver.01
INSULATION TESTER IR4055-11,IR4056-20,IR4056-21,IR4057-20,IR4058-20 [5MB]	Instruction Manual	English	Ver.02