Megger MIT525/2 MIT Series Insulation Resistance Testers

Megger MIT525/2 is a 5 kV advanced insulation resistance tester designed for diagnostic testing and maintenance of high-voltage electrical equipment including transformers, motors, switchgear, cables, and generators . As part of Megger’s Advanced range, this instrument bridges the gap between basic testing and expert-level diagnostics, offering full data management capabilities alongside comprehensive test modes .

Key Features

Feature Description

Maximum Test Voltage 5 kV

Resistance Range 10 kΩ to 10 TΩ

Test Modes IR, DAR, PI, DD, SV, Ramp Test, PDC

PI Predictor™ Predicts 10-minute PI values in 3-5 minutes

RE>Act™ Mode Enhances accuracy by monitoring reabsorption current

Noise Immunity Up to 6 mA rejection (450 V to 5 kV)

Data Transfer USB and Bluetooth® LE

Safety Rating CAT IV 600 V to 3000 m altitude

Technical Specifications

Insulation Testing

Parameter Specification

Fixed Test Voltages 250 V, 500 V, 1000 V, 2500 V, 5000 V

User-Defined Voltage 40 V to 1 kV (10 V steps); 1 kV to 5 kV (25 V steps)

Resistance Measurement 10 kΩ to 10 TΩ (digital); 100 kΩ to 10 TΩ (analog)

Accuracy (23°C) ±5% up to 1 TΩ; ±20% from 1 TΩ to 10 TΩ

Test Voltage Accuracy +4%, -0%, ±10 V at 1 GΩ load (0-30°C)

Short Circuit Current User selectable: 1 mA, 3 mA (default), 6 mA (mains only)

Current & Capacitance Measurement

Parameter Specification

Current Range 0.01 nA to 6 mA

Current Accuracy ±5% ±0.2 nA

Capacitance Range 10 nF to 25 μF

Capacitance Accuracy ±10% ±5 nF

Capacitor Charge Time <3 s/μF at 3 mA to 5 kV

Capacitor Discharge Time <250 ms/μF from 5 kV to 50 V

Voltmeter Function

Parameter Specification

Voltage Range 30 V to 660 V AC/DC

Frequency Range 45 Hz to 65 Hz

Accuracy ±3% ±3 V

Diagnostic Test Modes

The MIT525/2 supports a comprehensive suite of diagnostic tests :

Test Mode Application

IR Basic insulation resistance

IR(t) Timed insulation resistance

DAR Dielectric Absorption Ratio

PI Polarization Index

PI Predictor Estimates PI in reduced time

DD Dielectric Discharge test

SV Stepped Voltage test

Ramp Test Ramped voltage output

PDC Polarization/Depolarization Current (with software)