INSULATION TESTER
IR4057-50
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 IR4057-50 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 • Wireless support. Transfers measurements to your smartphone or tablet and allows you to quickly create reports with field photos and drawings. (Optional Wireless Adapter Z3210 is necessary) • Wirelessly transfer measurement data to Excel forms for input (Will be supported by the 2021 upgrade) • 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 |
Model No. : IR4057-50![]() |
Wireless support Wireless communication capability for even greater convenience than legacy model
Compatible with Wireless Adapter Z3210 (optional). It transfers measurements to your smartphone or tablet and allows you to quickly create reports with field photos and drawings. | |
Transport to GENNECT Cross
GENNECT Cross, a free app designed specifically for use with Hioki measuring instruments, lets you check and manage measurement results and create reports. | |
Transport to the Excel® file
Open an Excel® file and select a cell. | |
Product Video
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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. | |
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. | |
Robust, damage-resistant design
These instruments feature a robust design that can withstand being dropped onto concrete from a height of 1 m. | |
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. | |
Measurement switch designed for outstanding ease of use
The instrument’s measurement switch can be operated with just the thumb. | |
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 guarantee period: 1 year, Accuracy guarantee period after adjustment made by Hioki: 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 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. 0.3 second for PASS/FAIL decision (based on in-house testing)
Other functions
Indicate 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 supply
LR6 (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 mass
159 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)
Accessories
Connection cable L4930 ×1, Alligator clip set L4935 ×1, Test pin set L4938 ×1, Neck strap ×1, Instruction manual ×1, LR6 (AA) alkaline batteries ×4
0.200 - 10.00
0.200 - 25.0
0.200 - 50.0
0.200 - 500
0.200 - 1000
Accuracy: ±1.3% rdg. ±4 dgt., Input resistance: 100 kΩ or higher
Accuracy: ±2.3% rdg. ±8 dgt., Input resistance: 100 kΩ or higher, Average rectifier
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)
Catalog: INSULATION TESTER Series | Download PDF [3MB] | English |
Options
WIRELESS ADAPTER Z3210 • Increase your work efficiency, by eliminating human errors from manual reporting • Transfer readings on instruments to easy-to-read graphical reports to prove integrity • Compliance with wireless regulations in more than 50 countries and regions TEST LEAD • CONNECTION CABLE *The L4930 is bundled |
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