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Sonel MRU-120 Earth Resistance and Resistivity Tester - CAT IV

Possible measurements:

  • earth resistance measurment with 3-pole,4-pole method,
  • earth resistance measurement without disconnecting measured earths (using clamp),
  • continuity of equipotential bondings and protecting conductors
  • two clamps earth resistance measurement without auxiliary test probs,
  • earth resistivity measurement,

    It allows to take the measurements of:

  • earth resistance using auxiliary electrodes,
  • earth resistance using auxiliary electrodes and clamp (for measurements of multiple earth)
  • earth resistance using double clamps (for measurement of earthing when it is impossible to use auxiliary electrodes),
  • ground resistivity (Wenner method),
  • 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.
  • Additionally:

  • 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 50 Hz, 60 Hz
  • selection of maximum measuring voltage (25 V and 50 V)
  • introducing the distance between the electrodes for the resistivity in metres (m),
  • memory of 990 measurements (10 banks of 99 cells each),
  • calibration of clamp used,
  • real time clock (RTC),
  • data transmission to the computer (USB, wireless),
  • indication of battery state.
  • Electric security:

  • type of insulation: double, according to EN 61010 - 1 and IEC 61557
  • measurement category: CAT IV 300 V acc. to EN 61010 - 1
  • protection class acc. to EN 60529: IP54
  • Rated operational conditions:

  • operation temperature: -10...+50°C
  • storage temperature: -20...+70°C
  • humidity: 20...80%
  • Other technical data:

  • LCD display: graphic, backlighted
  • interface: USB, wireless
  • number of measurements carried out of set of batteries: > 500
  • warranty: 24 months                                    


Earth Resistance Testers


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