Megger MIT481/2 Insulation Tester

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  • Highly accurate insulation testing, continuity testing and voltage measurement
  • Automatic voltage detection and reading prevention
  • Three terminal connection for A, B and E leads

rrp £720.00

now £599.00 (Ex. VAT) £718.80 (Inc. VAT)

rrp £720.00

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"A highly accurate continuity and insulation tester"

  • Description

    Megger MIT481/2 Insulation Tester

    The Megger MIT481/2 Insulation Tester, part of Megger’s 480/2 range, is a versatile, advanced insulation tester that is perfect for use in the telecommunications or cable-testing industries. Importantly, the device’s feedback-controlled insulation test voltage is now accurate to within just +2% which improves accuracy and helps prevent damage from over-voltage. The Megger MIT481/2’s three terminal connection allows A, B and E leads to be connected simultaneously and then selected by the user via an on-screen interface, thus preventing time-consuming cable swaps. However, the device also functions as a conventional two-terminal tester.

    Test voltages of 50V, 100V, 250V and 500V can be chosen at the user’s discretion so insulation testing is quick and simple, especially thanks to the simple pass/fail indication on screen. The current test voltage and insulation resistance value are both shown whilst an ‘analogue’ arc expresses dynamic measurement readings. Tests are set to automatically shut down after a certain length of time. The Megger MIT481/2  automatically detects voltage over user-defined limits and will inhibit testing in the presence of dangerous voltage levels. Similarly, a buzzer will sound if insulation exceeds a user-adjusted limit, thus improving safety.

    For continuity testing, the Megger MIT481/2 gives two current options at 200mA and 20mA whilst the range is now automatic and continuous from 0.01Ω to 1MΩ. NULL lead resistance compensation further enhances accuracy and readings are provided for REN. Differential measurement displays the difference between two consecutive continuity tests. True RMS measurement can be used for voltage in the Megger MIT481/2 whilst capacitance and frequency readings are also available.

    Compared to the old Megger MIT480 range, the Megger MIT 481/2 now features a redesigned case, a back-stand and a 6 cell battery compartment with separate fuse access. The whole design is over-moulded for increased safety and it also meets IP54 weatherproofing standards. Overall, the Megger MIT481/2 is a versatile, highly accurate insulation tester with many different functions. Its numerous advanced measurement features and user-friendly functions make it a brilliant instrument for the telecommunications sector.

    Megger part number: 1004-741

    Key Features

    • Designed for telecommunications and cable testing
    • Insulation testing to 500V and 100GΩ
    • Continuity testing to 1MΩ
    • True RMS voltage measurement from 10mV to 600V AC/DC
    • Frequency and capacitance measurement
    • Three-wire connection for A, B and E
    • Weatherproof to IP54 standard
    • Test voltage accurate to within +2%
    • Digital display combined with analogue arc
    • Auto-testing function
  • Specification

    All quoted accuracies are at +20 °C.


    • Nominal test voltage: 50 V, 100 V, 250 V, 500 V

    Insulation accuracy

    • 50 Volts: 10 GΩ ± 2% ± 2 digits ± 4.0% per GΩ
    • 100 Volts: 20 GΩ ± 2% ± 2 digits ± 2.0% per GΩ
    • 250 Volts: 50 GΩ ± 2% ± 2 digits ± 0.8% per GΩ
    • 500 Volts: 100 GΩ ± 2% ± 2 digits ± 0.4% per GΩ

    Service Error: BS EN 61557-2 (2007).

    • 50V: ± 2.0% ± 2d, 100kΩ - 900kΩ ± 10.5%
    • 100V: ± 2.0% ± 2d, 100kΩ - 900kΩ ± 10.3%
    • 250V: ± 2.0% ± 2d, 100kΩ - 900kΩ ± 10.3%
    • 500V: ± 2.0% ± 2d, 100kΩ - 900kΩ ± 10.3%
    • Display range: Analogue: 1 GΩ full scale
    • Resolution: 0.1 kΩ
    • Short circuit/charge current: 2 mA +0% -50% to EN 61557-2 (2007)
    • Open circuit voltage insulation: -0% +2% ± 2 V
    • Test current: 1 mA at min. pass value of insulation to a maximum of 2 mA max.
    • EN61557 Operating range: 0.10 MΩ to 1.0 0GΩ
    • Leakage Current: 10% ±3 digits
    • Timer control: Countdown timer 60 second
    • Note: Above specifications only apply when high quality silicone leads are being used.


    • Continuity range: 0.01 Ω to 1.0 MΩ
    • Continuity accuracy: ± 3% ± 2 digits (0 to 100 Ω); ±5% ±2 digits (>100 Ω- 500 kΩ); (>500 kΩ - 1 MΩ unspecified)
    • Service Error: BS EN 61557-4
    • (2007) - ± 2.0%, 0.1Ω - 2Ω ± 6.8%
    • Open circuit voltage: 5 V ± 1 V
    • Test current: 200 mA (–0 mA +20 mA); (0.01 Ω to 4 Ω)
    • Lead resistance: Nulling up to 10 Ω

    Voltage range

    • Voltage range AC: 10 mV to 600 V TRMS sinusoidal (15 Hz to 400 Hz)
    • Voltage range DC: 10 mV to 600 V
    • Volt range accuracy AC: ± 2% ± 2 digits
    • Volt range accuracy DC: ± 2% ± 2 digits
    • Service Error: BS EN 61557-1 (2007) - ± 2.0% ± 2d, 0V - 300Vac/dc ± 5.1%
    • Waveform: Unspecified range: 0 – 10 mV (15 to 400 Hz)
    • Waveform for non-sinusoidal waveforms
    • additional specifications apply: ±3% ± 2 digits >100 mV to 600 V TRMS; ±8% ± 2 digits 10 mV to 100 mV TRMS
    • Default voltmeter: Operates at > 25 volts ac or dc on any range except OFF


    • Frequency measurement range: 15 Hz - 400 Hz
    • Frequency measurement accuracy: ±0.5% ± 1 digit

    Capacitance measurement

    • Capacitance range: 0.1 nF to 10 μF
    • Accuracy: ± 5.0% ± 2 digits ( 1 nF-10 μF)
    • Cable coefficient: 40n F/ km to 70nF / km
    • Unit of measure: 50nF / km

    Result storage

    • Storage capacity: >1000 test results

    Power supply

    • Power supply 6 x 1.5 V cells type IEC LR6 (AA, MN1500, HP7, AM3 R6HP) Alkaline; 6 x 1.2 V NiMH rechargeable cells may be used
    • Battery life: 3000 insulation tests with duty cycle of 5 sec ON /55 sec OFF @ 500 V into 500 kΩ
    • Charger (Optional): 12-15 V dc (accessory interface)
    • Dimensions: 228 mm x 108 mm x 63 mm (9.00 in x 4.25 in x 2.32 in)
    • Weight: 800 g
    • Weight (instrument and case): 1.75 kg (3.86 lb)
    • Fuse: Use only 2 x 500 mA (FF) 1000V 32 x 6 mm ceramic fuse of high breaking capacity HBC 30 kA minimum. Glass fuses MUST NOT be fitted.
    • Safety protection: The instruments meet EN 61010-1 (1995) to 600V phase to earth, Category IV. Refer to safety warnings supplied.
    • EMC In accordance with IEC 61326 including amendment No.1
    • Temperature co-efficient: <0,1% per °C up to 1 GΩ; <0,1% per °C per GΩ; above 1 GΩ


    • Operating temperature range and humidity: -10 to +55 °C; 90% RH at 40 °C max.
    • Storage temperature range: -25 to +70 °C
    • Calibration temperature: +20 °C
    • Maximum altitude: 2000 m
    • IP rating: IP 54
  • Supplied Accessories

    • Megger MIT481/2 Insulation Tester
    • Megger MIT481/2 Insulation Tester Owners Information CD
    • Red/Black silicone test leads with prods and clips
    • SP5 switched probe (not MIT400/2)
    • Owners information CD
    • 6 x AA alkaline batteries
    • Hard carry case
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