Megger MIT481 MIT Series Insulation Resistance Testers

Megger MIT481 is a state-of-the-art insulation and continuity tester specifically designed for telecommunications and cable testing applications. Part of the MIT480 mk2 series, this instrument directly replaces the well-established BM80 product group, offering greater functionality with simplified operation . The MIT481 features an ergonomic, over-moulded design that fits comfortably in the hand and can be used equally well by left-handed or right-handed operators.

Key Features

Feature Description

Insulation Testing Up to 1000 V and 200 GΩ range

Continuity Testing Fast testing from 0.01 Ω to 1 MΩ

Test Voltages 50 V, 100 V, 250 V, 500 V, 1000 V

Diagnostic Tests Polarization Index (PI) & Dielectric Absorption Ratio (DAR)

Display Dual digital and analog arc display

Live Circuit Detection 75 V warning and protection

Data Storage Test result storage with recall capability

IP Rating IP54 – Weatherproof and dust resistant

Safety Rating CAT IV 600 V

Technical Specifications

Insulation Testing

Parameter Specification

Test Voltages 50 V, 100 V, 250 V, 500 V, 1000 V

Maximum Insulation Resistance 200 GΩ

Short Circuit Current 2 mA maximum

Live Circuit Warning 75 V

Terminal Voltage Accuracy Stabilized output maintained under load

Continuity Testing

Parameter Specification

Measurement Range 0.01 Ω to 1 MΩ

Test Current 205 mA @ 0.01 Ω → 9.99 Ω; 20 mA @ 10.0 Ω → 99.9 Ω

Resolution 0.01 Ω

Audible Indication Fast buzzer with selectable threshold

Voltage Measurement

Parameter Specification

AC/DC Voltage Range 600 V True RMS

Frequency Measurement 40 Hz to 400 Hz

Accuracy TRMS measurement for accurate readings on non-sinusoidal waveforms

Capacitance and Distance Measurement

Parameter Specification

Capacitance Range 0.1 nF to 10 μF

Distance by Capacitance Cable length estimation based on capacitance measurement

General Specifications

Parameter Specification

Display Digital with analog arc display

Data Storage Test results can be saved and recalled

Bluetooth Available on MIT485/2; MIT481 supports storage only

Power Supply 6 x AA alkaline or NiMH batteries

Battery Life 2200 insulation tests (5 seconds ON / 55 seconds OFF @ 1000 V into 1 MΩ)

Fuse Access Separate fuse access compartment