Megger MIT515/2 Essential 5 kV Insulation Resistance Tester

The Megger MIT515/2 is a 5 kV insulation resistance tester from the renowned MIT500 series, designed for diagnostic testing and preventive maintenance of high-voltage electrical equipment . As part of the "Essential" tier within Megger’s MIT/S1 family, this instrument is purpose-built for users who require reliable go/no-go testing in demanding field environments without the need for onboard data storage or complex analysis features .

Key Features and Test Modes

The MIT515/2 delivers comprehensive diagnostic capabilities through multiple test modes, including Insulation Resistance (IR), timed insulation resistance (IR(t)), Dielectric Absorption Ratio (DAR), and Polarization Index (PI) . A standout feature is Megger's patented PI Predictor™ (PIp) function, which analyzes the initial portion of the insulation response curve to predict the 10-minute PI value within just 3–5 minutes—reducing test duration by up to 50% and significantly improving field productivity .

The instrument also incorporates the innovative RE>Act™ test mode, which monitors reabsorption current to provide enhanced measurement accuracy. This patented mode prevents insulation that should have failed from incorrectly passing and can also be used to monitor discharge following a test, ensuring dangerous return voltages do not occur .

Technical Specifications

The MIT515/2 offers five fixed test voltages: 250 V, 500 V, 1000 V, 2500 V, and 5000 V, with user-defined settings available from 40 V to 1 kV in 10 V steps and 1 kV to 5 kV in 25 V steps . The insulation resistance measurement range extends from 10 kΩ to 15 TΩ at 5 kV, with ±5% accuracy up to 1 TΩ . Capacitance measurement capability ranges from 10 nF to 25 μF, and the built-in voltmeter measures from 30 V to 660 V AC/DC .

The tester delivers a short-circuit/charge current of 3 mA and provides interference rejection up to 3 mA, ensuring stable measurements even in electrically noisy industrial environments .

Power and Safety

Power is supplied by a rapid-charge lithium-ion battery providing up to 6 hours of continuous testing at 5 kV with a 100 MΩ load . The instrument can operate directly from AC mains power even when the battery is depleted, eliminating work stoppages .

Safety is a paramount consideration. The MIT515/2 features a unique dual-case design with a tough outer shell protecting against drops and impacts, complemented by a fire-retardant inner case . It carries a CAT IV 600 V safety rating at altitudes up to 3000 meters, and the case achieves IP65 protection against dust and water ingress when closed .

Physical Specifications

The instrument measures 315 × 285 × 181 mm and weighs 4.5 kg, balancing portability with rugged durability for field use .