Sonel MRU-200 Earth Resistance Meter

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Datasheet - MRU-200+(2)


  • Multifunction Earth Test Set
  • MRU-200 is the only meter in the market which uses all measurement methods.
    Possible measurements:
    • Earth resistance measurement with 2-pole, 3-pole,4-pole method,
    • Impulse earth impedance measurement, three kinds of measuring impulse 4/10μs, 8/20μs, 10/350μs,
    • Earth resistance measurement without disconnecting measured earths (using clamp),
    • Two clamps earth resistance measurement without auxiliary test probes,
    • Earth resistivity measurement using Wenner method
    • Continuity measurement,
    • Leakage current measurement.
  • It allows to take the measurements of:
    • Earth resistance using auxiliary electrodes,
    • Earth resistance using auxiliary electrodes and clamp (for measurements of multiple earthing)
    • Earth resistance using double clamps (for measurement of earthing when it is impossible to use auxiliary electrodes),
    • Impulse earth impedance (without disconnecting measured earthing),
    • Current using the clamp (e.g. leakage) and flexible clamp (Rogowsky coil),
    • Measurement of continuity of equipotential bondings and protective conductors (meeting the requirements of IEC 60364 – 6 – 61:2000 section 6.12.2) with auto-zero function – with current 200 mA.


    • Measurement of resistance of auxiliary electrodes RS and RH,
    • Measurement of interference voltage,
    • Measurement of interference frequency,
    • Measurement in the presence of interference voltage in the power network
      with frequency 16 2/3 Hz, 50 Hz, 60 Hz and 400 Hz (with automatic selection of proper frequency of measuring signal or with manual selection),
    • Selection of maximum measuring voltage (25 V and 50 V)
    • Introducing the distance between the electrodes for the resistivity in metres (m) and feet (ft),
    • Memory of 990 measurements (10 banks of 99 cells each),
    • Calibration of clamp used,
    • Real time clock (RTC),
    • Data transmission to the computer (USB),
    • Indication of battery state.
  • Includes 1.2m red test lead, 2.2m black test lead, 2x25m test lead reels (red & blue), 50m yellow test lead reel, USB cable, Yellow pin probe, 4x 30cm earth stakes, carry case, 2x crocodile clips (black & red), power supply adaptor, NiMH rechargeable battery, battery charger cable, cramp, hanging straps, Sonel Reader software, calibration certificate & manual, 2 years warranty