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MI1050e General Purpose Insulation Tester

The MI‑1050e is a compact, analog insulation resistance tester designed for general-purpose testing up to 1,000 V. It is ideal for insulation measurements in low-voltage systems, providing highly reliable readings of insulation resistances up to 2 TΩ across four selectable test voltages: 100 V, 250 V, 500 V, and 1,000 V.

Favored by experienced technicians for its true analog meter, the MI‑1050e allows real-time observation of insulation behavior through pointer displacement, helping to diagnose insulation degradation over time.

With its rugged enclosure, lightweight build, and IP65 protection rating, this tester is fully portable and well-suited for fieldwork in harsh environments.

Key Features

  • Measures insulation resistance up to 2 TΩ

  • Four test voltages: 100 V, 250 V, 500 V, 1,000 V

  • Analog taut-band meter with extra-fine pointer & mirror scale

  • GUARD terminal eliminates surface leakage influence

  • Visual warning of dangerous voltage & automatic discharge

  • Compact, rugged design with water, dust, and sand resistance

  • Rechargeable internal battery

  • IP65 rating (with lid closed)

Technical Specifications

Test Voltages

  • 100 V, 250 V, 500 V, 1,000 V

Maximum Resistance Readings

  • 200 GΩ @ 100 V

  • 500 GΩ @ 250 V

  • 1 TΩ @ 500 V

  • 2 TΩ @ 1,000 V

Short Circuit Current

  • 1 mA ± 2%

Test Voltage Accuracy

  • ±2% of nominal voltage (on R ≥ 1 GΩ)

Current Limiting Resistance

  • 100 kΩ @ 100 V

  • 250 kΩ @ 250 V

  • 500 kΩ @ 500 V

  • 1 MΩ @ 1,000 V

Insulation Tester Accuracy

  • Class 2 (±2% of full-scale deflection)

Analog Indicator

  • Scale length: up to 98 mm

  • Taut-band with mirror scale

  • Class 1 indicator with fine pointer (minimizes parallax)

Environmental Protection

  • IP65 (with closed lid)

Compliance and Safety

  • IEC 61010-1 (Safety)

  • IEC 61326-1 (EMC)

  • IEC 61000-4-3 (Electromagnetic Immunity)

  • IEC 61000-4-2 (Electrostatic Immunity)

Power Supply

  • Internal 12 V / 2.3 Ah sealed lead-acid rechargeable battery

Battery Charger

  • Universal AC input: 100–240 V~

Temperature & Humidity

  • Operating: -10 °C to 50 °C (14 °F to 122 °F)

  • Storage: -25 °C to 70 °C (-13 °F to 158 °F)

  • Humidity: Up to 95% RH (non-condensing)

Physical

  • Weight: Approx. 8.16 lb (3.7 kg)

  • Dimensions: 10.78" x 9.84" x 4.88" (274 x 250 x 124 mm)

Application

  • Low-voltage installations

  • Motors, transformers, and cables

  • Electro-medical equipment

  • General electrical maintenance

  • Distribution systems

Included Accessories

  • 2 Measuring test leads

  • 1 GUARD test lead

  • 1 AC adapter / charger

  • 1 Carrying bag

  • 1 Operating instructions manual

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