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Metrel MI3144 Euro Z 800V HV Impedance Tester

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  • Operated via Metrel aMESM app or smart instrument such as MI3152 or MI3155
  • Suitable for evaluating automatic trip out protection on high voltage equipment
  • Performs numerous other tests incl. four-wire loop/line, battery resistance and more

rrp £3,735.75

now £2,840.00 (Ex. VAT) £3,408.00 (Inc. VAT)

rrp £3,735.75


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  • Description

    Metrel MI3144 Euro Z 800V HV Impedance Tester

    Metrel MI3144

    The Metrel MI3144 Euro Z 800V HV Impedance Tester is a supplementary tester that can function on its own when controlled via the Android aMESM app or be used in conjunction with various Metrel testers such as the MI3152, MI3155 or MI3325. It is designed to assess the effectiveness of automatic trip out protection in the case of faults in HV equipment such as transformers, generators, turbines, switchyards and distribution boards.

    The Metrel MI3144 is capable of carrying out a 4-wire, 300A loop and line impedance test with a high degree of precision as well as a high-range impedance test on 800V / 16…420Hz AC networks. It is also capable of carrying out a source and line resistance measurement in 3 to 260V DC networks in addition to a high-current dR 300A four-wire test for partial voltage drops and current path resistance.

    Further test functions include earth leakage relay (ELR) trip-out testing time and current for AC, A, and B ELRs. Ground fault analysis with contact, touch, and step voltage are all available and the Metrel MI3144 also acts as a floating voltmeter for partial contact results.

    With a flex and iron clamp, the Metrel MI3144 can perform testing of lightning systems using the one-clamp, high current grounding method and it has a selectable test load (16.6% to 100%) alongside improved thermal performance.

    Metrel MI3144

    The Metrel MI3144 is specifically designed for challenging conditions as it has an ingress protection rating of IP55 when the case is open and IP65 when the case is closed. It has a Cat IV 600V safety rating and can be powered by an external power supply or the internal rechargeable batteries.

    Standard supplied accessories include test leads up to 50 metres, test clips, test probes, a resistance probe, test rods, step voltage plates, a Metrel ES Manager BASIC licence, the Metrel aMESM Android app with a P1102 PRO licence key, a calibration certificate and two carry cases.

    By upgrading to the Metrel MI3144 Euro Set, the user can also add further accessories to the purchase including additional test leads up to 75 metres, cable reels, a 42cm current earth spike, a 1-phase flexible current clamp with an extension lead, a Metrel ES Manager PRO licence a jumbo case and a jumbo case mount.

    Metrel part number: MI 3144

    Key Applications

    • 4-wire, 300A loop/line impedance testing
    • Partial voltage drop and clamp current resistance measurement
    • Airports high frequency (16…420Hz) installation impedance test
    • DC networks/power sources loop and line testing
    • Lightning system testing using one-clamp high-current grounding method
    • Testing integrity of grounding system w/ one-clamp method
    • ELR (MRCD) trip current and time testing
    • Measurement of earth potential & step, touch, transfer voltages
    • Automatic trip-out protection evaluation
    • Power transformer and motor winding tests
    • Battery resistance testing
    • Ground grid intensity testing
    • Contact voltage testing
    • High-current injection ground fault simulation
    • One clamp earth resistance testing
  • Specification

    Standard functions

    Impedance testing (Z) Z line mΩ, Z loop mΩ

    • Ranges: 0.1mΩ to 199.9mΩ; 200mΩ to 1999mΩ; 2.00Ω to 19.99Ω
    • Resolution: 0.1mΩ; 1mΩ; 10mΩ
    • Accuracy: ±(5% of reading + 3mΩ); ±(5% of reading + 3mΩ); ±(5% of reading + 3 digits)

    Impedance testing (Z) High current ∆R

    • Ranges: 0.1mΩ to 199.9mΩ; 200mΩ to 1999mΩ; 2.00Ω to 19.99Ω
    • Resolution: 0.1mΩ; 1mΩ; 10mΩ
    • Accuracy: ±(5% of reading + 3mΩ); ±(5% of reading + 3mΩ); ±(5% of reading + 3 digits)

    Impedance testing (Z) High current Rsel

    • Ranges: 0.1mΩ to 199.9mΩ; 200mΩ to 1999mΩ; 2.00Ω to 19.99Ω
    • Resolution: 0.1mΩ; 1mΩ; 10mΩ
    • Accuracy: ±(8% of reading + 3mΩ); ±(8% of reading + 3mΩ); ±(8% of reading + 3 digits)

    DC resistance (R) R line mΩ

    • Ranges: 0mΩ to 1999mΩ; 1.00Ω to 19.99Ω
    • Resolution: 1mΩ; 10mΩ
    • Accuracy: ±(5% of reading + 3 digits)

    Earth potential (U) Utouch

    • Ranges: 0.01V to 199.9V; 200V to 999V
    • Resolution: 0.1V; 1V
    • Accuracy: Calculated value

    Earth potential (U) Um

    • Ranges: 1mV to 1999mV; 2.00V to 19.99V; 20.0V to 199.9V
    • Resolution: 1mV; 10mV; 0.1V
    • Accuracy: ±(2% of reading + 2 digits)

    ELR test (I and t) ELR I

    • Ranges: 0.1mA to 199.9mA; 200mA to 1999mA; 2.00A to 19.99A
    • Resolution: 0.1mA; 1mA; 10mA
    • Accuracy: ±(5% of reading + 3 digits)

    ELR test (I and t) ELR t

    • Ranges: 0.1ms to 199.9ms; 200ms to 1999ms; 2.00s to 20.00s
    • Resolution: 0.1ms; 1ms; 10ms
    • Accuracy: ±(2% of reading + 3 digits)

    Functions w/ additional clamps

    Current (w/ A 1281 clamp)

    • Ranges: 0.5A; 5A; 100A; 1000A
    • Measuring ranges: 10mA to 749mA; 0.10A to 7.49A; 2A to 149A; 20A to 999A
    • Display ranges: 0 to 749mA; 0.00 to 7.49A; 0.0A to 99.9A; 100A to 149A
    • Resolution: 1mA; 0.01A; 0.1A; 1A
    • Uncertainty: ±(2.5% of reading + 3 digits)

    Current (w/ A1227 or 1609 clamp)

    • Ranges: 30A; 300A; 3000A
    • Measuring range: 0.6A to 59.9A; 6A to 599A; 0.06kA to 5.99kA
    • Display range: 0.0 to 59.9A; 0 to 599A; 0.00 to 5.99kA
    • Resolution: 0.1A; 1A; 0.01kA
    • Uncertainty: ±(3.5% of reading + 3 digits)


    • Battery power supply: 7.2 V DC (4.4 Ah Li-ion)
    • Battery charging time: typical 3.0 h (deep discharge)
    • Mains power supply: 90 ... 260 V AC, 45 ...65 Hz, 80 VA
    • Over-voltage category: 300 V CAT II
    • Protection classification: reinforced insulation
    • Measuring category: 600 V CAT IV
    • Pollution degree: 2
    • Degree of protection: IP 65 (case closed), IP54 (case open)
    • Dimensions (w x h x d): 36 cm x 16 cm x 33 cm
    • Weight: 6.5 kg (without accessories)
  • Supplied Accessories

    Standard Set

    • Metrel MI 3144 Euro Z 800 V HV Impedance Tester
    • Mains cable
    • RS232-PS/2 cable
    • Test lead 5 m, black, 2 pcs
    • Test lead 5 m, red, 1.5 mm2, 2 pcs
    • Test lead 50 m, red, 1.5 mm2*
    • Test lead 20 m, black
    • Test lead 50 m, green*
    • Large Kelvin test clip, 2 pcs
    • Crocodile clip, black, 2 pcs
    • Crocodile clip, red, 2 pcs
    • Crocodile clip, green
    • Test probe, black, 2 pcs
    • Test probe, red , 2 pcs
    • G clamp
    • Human body resistance probe
    • Test rod, 2 pcs
    • Step voltage plates, 2 pcs
    • Metrel ES Manager BASIC license**
    • Metrel aMESM Android app with P 1102 PRO license key
    • Short instruction manual
    • Calibration certificate
    • Protective bag for accessories
    • Soft carrying bag*

    Euro Set Adds

    • Test lead 5 m, green
    • Test lead on a cable reel, 75 m, red, 2.5mm2
    • Test lead on a cable reel, 75 m, green
    • Professional current earth spike, 42 cm
    • 1-phase flexible current clamp
    • Current clamp A 1281 extension cable, 5 m
    • Metrel ES Manager PRO license**
    • Jumbo case
    • Extension cable reel
    • Jumbo case mount
  • Product Documents

    Product Attachments

    View FileMetrel MI3144 Datasheet    Size: (931.19 KB)
    View FileMetrel HV Impedance Test Brochure    Size: (15.15 MB)
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