Megger MIT200 MIT Series Insulation Resistance Testers

Product Series: MIT200 (Models include MIT200, MIT210, MIT220, MIT230)

Manufacturer: Megger

Product Type: Pocket-sized Insulation and Continuity Tester

1. Introduction

The Megger MIT200 Series is a range of compact, pocket-sized insulation resistance testers designed for electrical contractors, maintenance engineers, and service departments. Despite their small footprint—being one of the smallest testers on the market—these units are robust and packed with safety features. They are ideal for testing transformers, motors, generators, switchgear, cabling, and domestic appliances. The units feature Megger’s patented DART (Digital Arc) technology, which combines the precise numerical reading of an LCD with the dynamic response of an analog pointer, allowing users to evaluate circuit charge and discharge characteristics effectively.

2. Key Features

Insulation Testing: Measures up to 1000 MΩ.

Test Voltages: Available in 250 V, 500 V, and 1000 V configurations depending on the specific model (e.g., MIT220 offers 250 V/500 V; MIT230 offers 250 V/500 V/1000 V).

Continuity Testing: Tests at 200 mA down to 0.01 Ω, complying with international safety standards (BS 7671, EN61557).

Live Circuit Warning: Automatic voltage detection up to 600 V AC/DC with a warning indicator; testing is inhibited if a live voltage >50 V is detected to protect the user.

Display: Dual digital/analog display with backlight for use in dark environments.

Safety Rating: CAT III 600 V (suitable for distribution board level) and CAT IV 300 V.

Power Supply: Operates on 6 x AA (LR6) batteries (Alkaline or NiMH rechargeable).

3. Detailed Technical Specifications

Insulation Measurement

Parameter Specification

Test Voltages (DC) 250 V, 500 V, or 1000 V (Model dependent)

Resistance Range 10 kΩ to 999 MΩ (up to 1000 MΩ)

Voltage Accuracy -0% / +25% at rated load

Short Circuit Current 2 mA (nominal)

Auto Discharge Automatic discharge of capacitive circuits after test

Continuity & Resistance

Parameter Specification

Measuring Range 0.01 Ω to 100 Ω

Open Circuit Voltage 5 V ± 1 V

Short Circuit Current 205 mA (±5 mA) up to 10 Ω

Lead Null Adjustable up to 9.99 Ω (removes test lead resistance)

Buzzer Sounds at < 5 Ω (Fast response <20 ms)

General Specifications

Parameter Specification

Voltmeter (Default) Measures 25 V to 600 V AC/DC (Auto-ranging)

Test Inhibit Activates at >50 V AC/DC

Operating Temperature -10°C to +55°C

Storage Temperature -25°C to +65°C

Humidity 93% RH at +40°C max

Dimensions 195 mm x 98 mm x 40 mm (7.7 in x 3.9 in x 1.6 in)

Weight Approx. 530 g to 550 g (1.2 lbs)

IP Rating IP54 (Protected against dust and water splashes)

Battery Life Approximately 3000 x 5-second tests (2Ah batteries)

4. Safety and Compliance

The MIT200 series adheres strictly to international safety standards. It is designed to BS EN61010-1 (Cat III 600 V). It features a "Live Circuit Warning" that alerts the user if a voltage is present on the circuit under test, and an automatic "Test Inhibit" function that prevents insulation testing if a dangerous voltage (>50 V) is detected, ensuring operator safety.