Megger MIT1525/2 Advanced 15kV Insulation Resistance Tester

Megger MIT1525/2 is an Advanced 15 kV insulation resistance tester designed for engineers and technicians performing diagnostic testing on high-voltage electrical equipment including transformers, motors, switchgear, and cables in environments up to 230 kV .

This instrument is part of Megger's Advanced range (alongside MIT525/2 and MIT1025/2), offering comprehensive diagnostic capabilities with onboard storage and data export functionality. It is ideal for users who need to record test results, transfer data to software/mobile applications, and perform in-depth insulation diagnostics without requiring remote control capabilities .

Key Features

Feature Description

Maximum Test Voltage 15 kV DC

Maximum Resistance Measurement 30 TΩ (30 teraohms)

RE>Act™ Mode Patented test mode that monitors reabsorption current to prevent incorrectly passing or failing insulation, and ensures dangerous return voltages do not occur

PI Predictor™ (PIp) Predicts 10-minute Polarization Index values in 3-5 minutes, cutting test time by up to 50% or more

Noise Immunity 6 mA rejection (from 2100 V to 15 kV), suitable for HV environments up to 230 kV

Dual-Case Design Tough outer case protects against knocks and drops; inner case is fire-retardant

IP Rating IP65 (lid closed) for dust and moisture protection during transport; IP40 (lid open)

Safety Rating CAT IV 1000 V up to 3000 m (9842 ft) altitude

Power Supply Li-ion battery or AC mains supply; rapid charge capability

Data Interface Fully isolated USB (Type B) and optional Bluetooth® Class 2 for safe data transfer

Display Intuitive color custom display with backlight, showing resistance, voltage, current, and capacitance simultaneously

Technical Specifications

Insulation Testing

Parameter Specification

Preset Test Voltages 1000 V, 2500 V, 5000 V, 10000 V, 15000 V

User-Defined Test Voltage 100 V to 1 kV in 10 V steps; 1 kV to 15 kV in 25 V steps

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

Resistance Range 10 kΩ to 30 TΩ at 15 kV

Resistance Accuracy (±5%) 3 TΩ at 15 kV, 2 TΩ at 10 kV, 1 TΩ at 5 kV, 500 GΩ at 2500 V, 200 GΩ at 1000 V

Resistance Accuracy (±20%) 30 TΩ at 15 kV, 20 TΩ at 10 kV, 10 TΩ at 5 kV, 5 TΩ at 2500 V, 2 TΩ at 1000 V

Capacitance Range 10 nF to 50 μF

Capacitance Accuracy ±10% ±5 nF

Current Range 0.01 nA to 6 mA

Current Accuracy ±5% ±0.2 nA at all voltages

Short Circuit / Charge Current 1 mA, 3 mA (default), 6 mA at 5/10/15 kV (6 mA only from mains supply)

Interference (Noise) Rejection 6 mA from 2100 V to 15 kV

Capacitor Charge Time <7.5 s/μF at 3 mA to 15 kV

Capacitor Discharge Time <3500 ms/μF to discharge from 15 kV to 50 V

Guard Terminal Performance

Parameter Specification

Performance Guards out current IG ≥5000× IL at 100 GΩ / 5000 V with maximum error of 1%

Voltmeter

Parameter Specification

Voltage Range 30 V to 660 V AC/DC, 45 Hz to 65 Hz

Voltmeter Accuracy ±3%, ±3 V

Auto-Ranging AC Input 90 to 264 V rms, 47 to 63 Hz, 200 VA

Test Modes and Diagnostics

Test Mode Description

IR Insulation Resistance (basic test)

IR(t) Insulation Resistance Time Recording

DAR Dielectric Absorption Ratio

PI Polarization Index

PI Predictor (PIp) Predictive Polarization Index

DD Dielectric Discharge

SV Stepped Voltage

Ramp Test Continuously increasing voltage test

PDC Polarization Depolarization Current (requires PowerDB software)

RE>Act™ Reabsorption current monitoring mode

Timer

Parameter Specification

Timer Range Up to 99 minutes 59 seconds (15 seconds minimum setting)

Memory and Data Management

Parameter Specification

Memory Capacity 5.5 hours logging at 5 second intervals

Data Storage Time/date stamping of results, logging, and recall to screen

Interface USB Type B (device), Bluetooth® Class 2

Real-Time Output 1 Hz output readings (V, I, R)

Software Compatibility PowerDB Lite (free), PowerDB Advance/Pro, CertSuite Asset

Power Supply

Parameter Specification

Battery Type 10.8 V, 5.2 Ah Li-ion (meets IEC 62133:2003)

Battery Life 4.5 hours (typical) continuous testing at 15 kV with 100 MΩ load

Battery Charge Time 2.5 hours (deep discharge); 2 hours (normal discharge)

Mains Operation Operates from AC source when battery is flat or low

Environmental Specifications

Parameter Specification

Operating Temperature -20°C to +50°C (-4°F to +122°F)

Humidity 90% RH non-condensing at 40°C (104°F)

Maximum Altitude 3000 m (9842 ft) for CAT IV 1000 V rating

Physical Specifications

Parameter Specification

Dimensions (H x W x D) 360 × 305 × 194 mm (14.2 × 12 × 7.6 in)