IR4057 Insulation Tester

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 X 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 X 177 mm (6.97 in) HX 53 mm (2.09 in) D, 640 g (22.6 oz) (including batteries, excluding test leads)

Accessories

Test Lead L9787 X 1, Neck strap X 1, Instruction manual X 1, LR6 (AA) alkaline batteries X 4