INSULATION TESTER IR4057
5-Range, 50 to 1000V Digital Insulation Tester with
Continuity Check
Hioki insulation testers or megohmmeters feature all-in-one designs
including built-in rugged cases and test lead storage compartments.
The IR4057 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.

Model No. (Order Code)

IR4057-20High-speed model
CEDROPPROOF

CAT III 600 V

Key Features

• 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


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 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
Power supplyLR6 (AA) alkaline batteries × 4, Continuous use: 20 hours (based on in-house testing)
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 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
Catalog: INSULATION TESTER IR4056, IR4057, IR4058Download PDF  [3MB]English

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