Megger MIT420/2 MIT Series Insulation Resistance Testers

Megger MIT420/2 is an advanced CAT IV 600 V insulation and continuity tester from the MIT400 mk2 Series . Designed for both electrical and industrial testing applications, this multifunction instrument delivers professional-grade insulation testing capabilities in a rugged, weatherproof package .

The MIT420/2 features a variable test voltage range that allows any intermediate voltage from 10 V to 1000 V in 1 V steps, making it ideal for applications requiring specific test voltages not found in standard ranges.

Key Features

Feature Description

Insulation Testing Up to 1000 V and 200 GΩ range

Variable Test Voltage 10 V to 1000 V continuously adjustable (1 V steps)

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

Continuity Testing Single autoranging range from 0.01 Ω to 1.0 MΩ

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

Stabilized Output Voltage maintained within -0% / +2% ±2 V of selected value

Live Circuit Detection Automatic detection and protection (>25 V triggers voltage measurement)

Data Storage Onboard memory for test results

Display Analogue arc with dual digital readout

IP Rating IP54 – Dust and water resistant

Safety Rating CAT IV 600 V / CAT III 1000 V

Technical Specifications

Insulation Testing

Parameter Specification

Test Voltages (Fixed) 50 V, 100 V, 250 V, 500 V, 1000 V

Variable Voltage Range 10 V to 1000 V (1 V steps)

Maximum Measurement 200 GΩ

Short Circuit Current 2 mA (+0% / -50% per EN 61557-2)

Test Current 1 mA at minimum pass values, maximum 2 mA

Open Circuit Voltage Accuracy -0% / +2% ±2 V

Measurement Accuracy ±2% ±2 digits

Insulation Resistance Ranges 10 GΩ / 20 GΩ / 50 GΩ / 100 GΩ / 200 GΩ

Continuity Testing

Parameter Specification

Measurement Range 0.01 Ω to 1.0 MΩ (autoranging)

Resolution 0.01 Ω

Open Circuit Voltage 5 V ±1 V

Test Current (0.01 Ω - 4 Ω) 200 mA (-0 mA / +20 mA)

Test Current (higher ranges) 20 mA

Lead Null Up to 9.00 Ω

Measurement Accuracy ±5% ±2 digits (0.01 Ω - 999 kΩ)

Voltage Measurement

Parameter Specification

DC Voltage Range 0 to 600 V

AC Voltage Range (TRMS) 10 mV to 600 V

AC Bandwidth 15 Hz to 400 Hz

DC Accuracy ±2% ±2 digits

AC Accuracy (sinusoidal) ±2% ±2 digits

Input Impedance 0.25 MΩ

Frequency Measurement

Parameter Specification

Measurement Range 15 Hz to 400 Hz

Accuracy ±0.5% ±1 digit

Capacitance Measurement

Parameter Specification

Measurement Range 0.1 nF to 10 μF

Accuracy ±5% ±2 digits

General Specifications

Parameter Specification

Display Analogue arc with dual digital display

Test Lock Function Yes (for continuous testing)

Leakage Current Display µA readout available during insulation test

Timer Control 60-second countdown timer

Data Storage >1000 test results

Power Supply 6 x 1.5 V AA (LR6) alkaline or 6 x 1.2 V NiMH rechargeable

Battery Life 3000 insulation tests (5 sec ON / 55 sec OFF @ 1000 V into 1 MΩ)

Auto Power Down Yes (configurable)