Reliable and Efficient Insulation Testing in the Field

Hioki insulation resistance testers or megohmmeters feature all-in-one designs including built-in rugged cases and test lead storage compartments. The IR4016-20 is a single-range, 500 V/100 MΩ analog insulation resistance tester with efficient functions and features to help shorten work time associated with field insulation testing.

Key Features

  • Single range testing voltage of 500 V
  • Test insulation resistance up to 100 MΩ
  • Built tough to withstand a 1-meter drop onto a concrete floor
  • Bright LED luminous scale
  • Check for live circuits and battery status
  • Integrated hard case for quick and easy storage without disconnecting the leads

Model No. (Order Code)

IR4016-20 500 V/ 100 MΩ, Test Lead L9787 bundled

Single 500 V/100 MΩ range with simple, easy-to-read scale for insulation resistance values

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.

Continuous monitoring of battery life

You can keep track of remaining battery life since it’s shown on the LED, eliminating the need to worry about sudden loss of battery power in the field.

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.

Remote control to start and stop insulation resistance measurement from the leads

By using switch-equipped measurement leads, you can start and stop insulation resistance measurement remotely. There’s also a handy light for improved convenience when working in dim locations.

Basic specifications

Accuracy guaranteed: 1 year
Rated output voltage 500 V DC
Effective maximum indicated value 100 MΩ
Accuracy 1st effective measuring range ±2 % of scale length, 0.1 M to 50 MΩ
Lower limit resistance 0.5 MΩ (measurement resistance value to maintain testing voltage)
Overload protection 600 V AC (10 sec.)
AC voltage range 0 to 600 V (50/60 Hz), ±5 % of maximum scale value accuracy,
500 kΩ or more input resistance
Other functions Bright LED luminous scale, Drop proof (on concrete, 1 m/1 time), Battery check, Live circuit check, Auto discharge
Power supply LR6 (AA) alkaline batteries ×4, Continuous use: 20 hours (no load)
Dimensions and mass 159 mm (6.26 in) W × 177 mm (6.97 in) H × 53 mm (2.09 in) D, 610 g (21.5 oz), (including battery, excluding test lead)
Included accessories Test Lead L9787 ×1, LR6 (AA) alkaline batteries ×4, Instruction manual ×1, Shoulder strap ×1

L9787 options (2)

Exclusively for the L9787 *The L9787 is bundled

L9788 options (4)

Exclusively for the L9788-10/ L9788-11

Shared option (1)

Attached to the Earth side lead tip