Megger MIT485/2 Insulation Tester

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  • Capable of insulation testing, continuity testing and TRMS voltage measurement
  • Advanced features include lead resistance compensation and feedback-controlled testing
  • Test voltage now accurate to +2%, preventing damage and improving accuracy

rrp £795.00

now £616.25 (Ex. VAT) £739.50 (Inc. VAT)

rrp £795.00

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"Insulation test voltage goes up to 500V and falls within +2% accuracy"

  • Description

    Megger MIT485/2 Insulation Tester

    The Megger MIT485/2 Insulation Tester is an advanced instrument which can voltage test insulation up to 500V and 100GΩ despite its small, hand-held design. It is primarily designed for use in the telecommunications or cable testing sectors and the feedback-controlled insulation test voltage is now accurate to within +2% - rather than the previous +10-20% - so testing is more accurate and there is less risk of damage caused by over-voltage. The three terminal connection allows concurrent connection with A, B and E test leads and the user can then simply choose the correct pair using the on-screen interface. Consequently, there is no need to swap wires when taking different measurements, although the Megger MIT485/2 can also be used as a conventional two terminal device.

    Pre-set test voltages of 50V, 100V, 250V and 500V make the Megger MIT485/2 quick to use whilst custom voltages can be set between 10 and 500V at the user’s discretion. Results are simplified by a clear pass/fail indication on screen whilst exact, accurate readings are shown for both resistance and the current test voltage. A moving ‘analogue’ arc also portrays dynamic readings and tests are automatically set to time-out after a certain period. Voltage is feedback-controlled, thereby improving safety and accuracy whilst the Megger MIT485/2 automatically detects voltage and prevents testing if it exceeds user-adjusted limits. An insulation buzzer warns the user if insulation is above a certain limit, again fully customisable for the user.

    The Megger MIT485/2 has two test currents at 200mA and 20mA for continuity testing whilst the continuous, automatic range now goes from 0.01Ω to 1MΩ. Accuracy is aided by ‘NULL’ lead resistance compensation and ratings are available for REN and differential measurement. True RMS readings are also available for voltage (0 to 600V AC/DC). Other general measurements can be taken by the Megger MIT485/2 including capacitance from 0.1nF to 10µF, and frequency measurement between 15Hz and 400Hz.

    Upgrades from the previous Megger MIT480 range include a redesigned case, back-stand, and a 6 cell battery compartment with separate fuse access. The instrument is over-moulded for increased protection and also meets the IP54 weatherproof rating whilst the large, two-line display and analogue needle show measurements clearly and dynamically. Bluetooth connectivity allows data to be easily downloaded in the form of an Excel/CSV file. With numerous safety features and impressive measurement capabilities over insulation testing, capacitance, voltage and continuity testing, the Megger MIT485/2 is a versatile, safe measurement instrument. It comes provided with high-quality silicone leads, an SP5 switched probe, an owner’s information CD, six AA batteries and a hard carry case.

    Megger part number: 1004-742

    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
    • Data transfer via Bluetooth connectivity
    • 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
    • Data download: Bluetooth®* wireless / Bluetooth® Class II
    • Range: up to 10 m

    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

    *The Bluetooth ® word mark and logos are registered trademarks
    owned by Bluetooth SIG, Inc and is used under licence.

  • Supplied Accessories

    • Megger MIT485/2 Insulation Tester
    • Megger MIT485/2 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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