Metrel MI3205 TeraOhmXA 5kV Insulation Tester

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  • Measures insulation resistance up to 15TΩ with test voltages of up to 4.99kV
  • Performs a range of analytical functions for insulation assessment
  • Suitable for transformers, transducers, rotating machinery and other industrial installations

rrp £2,377.00

now £1,664.00 (Ex. VAT) £1,996.80 (Inc. VAT)

rrp £2,377.00

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  • Description

    Metrel MI3205 TeraOhmXA 5kV Insulation Tester

    The Metrel MI3205 TeraOhmXA 5kV Insulation Tester is a piece of industrial equipment that is suitable for testing transformers, transducers, high voltage generators, production lines, varistors and surge arrestors. It is also suited to testing insulation on rotating machinery and cables.

    The Metrel MI3205 has test voltages from 50V to 4.99kV in 50V and 100V steps which allows it to measure insulation resistance between 0.01MΩ and 15TΩ with a maximum resolution of 10kΩ and a best accuracy of ±(5% + 3 digits). Test voltages can be applied in a step voltage test – ideal for testing varistors – and the tester also has a programmable timer.

    Diagnostic functions for insulation testing include dielectric absorption ratio, polarisation index, and dielectric discharge (all from 0.01 to 100.0). The Metrel MI3205 has an additional high voltage breakdown detection feature as well as a guard terminal and automatic discharge of target objects following the tests. The user can set their own automatic test sequences and tester has automatic adjustment for the specific requirements of a test.

    Other measurements are possible with the Metrel MI3205 including insulation leakage current from 0.00nA to 5.00mA, capacitance from 20nF to 50µF, voltage from 5V to 550V, and finally frequency from 10Hz to 500Hz. High frequency input AC current noise rejection and additional result averaging helps negate the effects of interference.

    Numerical and graphical results can be shown on the Metrel MI3205’s vibrant colour screen and it can save results to its internal memory. Operation is conducted using the simple navigation buttons and intuitive interface whilst USB, RS-232 and wireless Bluetooth connections are available for data transfer. The supplied Metrel HVLink PRO software package facilitates downloading, analysis and reporting.

    The Metrel MI3205 is capable of working from the mains or from its own rechargeable battery and has an overvoltage rating of Cat IV 600V. It is suitable for use in challenging industrial environments thanks to a robust design that boasts an IP54 ingress protection rating when open and an IP65 ingress protection rating when closed.

    Supplied accessories include shielded test lead, a guard lead, crocodile clips, a calibration certificate, a USB cable and an RS-232 cable.

    Metrel part number: MI3205

    Key Features

    • Test voltages between 50V to and 4.99kV
    • 50V and 100V test voltage steps
    • Measurement range: 0.01MΩ to 15TΩ
    • Step voltage test
    • Insulation leakage current: 0.00nA to 5.00mA
    • Dielectric absorption ratio, polarisation index, dielectric discharge
    • Measures capacitance, voltage & frequency
    • Insulation breakdown analysis
    • Custom defined test sequences
    • Mains and battery powered
    • Bluetooth, USB & RS-232 communication
    • Suitable for industrial insulation testing
    • IP65 rating with case closed
  • Specification

    Insulation resistance

    Measurement ranges

    • 0.01MΩ to 9.99MΩ
    • 10.0MΩ to 99.9MΩ
    • 100MΩ to 999MΩ
    • 1.00GΩ to 9.99GΩ
    • 10.0GΩ to 99.9GΩ
    • 100GΩ to 999GΩ
    • 1.0TΩ to 9.9TΩ
    • 10TΩ to 15TΩ


    • 10kΩ
    • 100kΩ
    • 1MΩ
    • 10MΩ
    • 100MΩ
    • 1GΩ
    • 100GΩ
    • 1TΩ


    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(15% + 3 digits)
    • ±(15% + 3 digits)

    Test voltage

    • Ranges: 0V to 999V; 1.00kV to 4.99kV
    • Resolutions: 1V; 10V
    • Accuracy: ±(5% + 3 digits)

    Insulation leakage current


    • 1.00mA to 5.00mA
    • 100µA to 999µA
    • 10.0µA to 99.9µA
    • 1.00µA to 9.99µA
    • 100nA to 999nA
    • 10.0nA to 99.9nA
    • 0.00nA to 9.99nA


    • 10µA
    • 1µA
    • 100nA
    • 10nA
    • 1nA
    • 100pA
    • 10pA


    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(5% + 3 digits)
    • ±(10% + 0.15nA)

    Dielectric absorption ratio (DAR)

    • Range: 0.01 to 9.99; 10.0 to 100.0
    • Resolution: 0.01; 0.1
    • Accuracy: ±(5% + 3 digits)

    Polarisation index (PI)

    • Range: 0.01 to 9.99; 10.0 to 100.0
    • Resolution: 0.01; 0.1
    • Accuracy: ±(5% + 2 digits)

    Dielectric discharge

    • Ranges: 0.01 to 9.99; 10.0 to 100.0
    • Resolution: 0.01; 0.1
    • Accuracy: ±(5% + 2 digits)

    True RMS Voltmeter

    • Ranges: 5V to 550V
    • Accuracy: ±(2% + 2 digits)


    • Range: 10Hz to 500Hz
    • Accuracy: ±(0.2% + 1 digit)


    • Ranges: 20.0nF to 999nF; 1.00µF to 9.99µF; 10.0µF to 50.0µF
    • Resolutions: 1nF; 10nF; 100nF
    • Accuracy: ±(5% + 3 digits)


    • Power supply: 90-260VAC, 45-65Hz, or 14.4 VDC (4.4 Ah Li-Ion)
    • Protection degree: IP65 (case closed); IP54 (case open)
    • Display: 320 x 240 dots matrix display with backlight
    • Overvoltage category: Cat IV 600V
    • Protection class: Reinforced insulation
    • COM port: RS232, Bluetooth, USB
    • Dimensions: 345mm x 160mm x 335mm
    • Weight: 6.5kg
  • Supplied Accessories

    • Metrel MI3205 TeraOhmXA HV Insulation Tester
    • 10kV shielded test lead, 2m, 2pcs (black, red)
    • 10kV crocodile clip, 2pcs, (black, red)
    • Guard test lead, green, 2m
    • Crocodile clip, green
    • Mains cable
    • OC SW HVLink PRO with USB and RS-232 cable
    • Handbook ‘Guide to modern insulation testing’ on storage media
    • Instruction manual on storage media
    • Calibration certificate
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