HIOKI-IR4057-20 Digital Insulation Resistance

Rated output voltage
50 VDC
125 VDC
250 VDC
500 VDC
1000 VDC


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
AC 600 V (10s)
AC 1200 V (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. 0.3 second for PASS/FAIL decision (at Hioki's conditions)


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 (at Hiokis conditions) 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
Test Lead L9787 ×1, Neck strap ×1, Instruction manual ×1, LR6 (AA) alkaline batteries ×4