MRU-120

MRU-120
Index: WMGBMRU120
Earth Resistance and Resistivity Meter
Description
Technical Specification
Files
  • Description

    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,
  • Technical Specification

    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 measuring multiple earthing without underground connections,
    • 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

    Measurement of interference voltage

    Range Resolution Accuracy
    0...100 V 1 V ±(2% m.v + 3 digits)
    • singnalling overvoltage 24 V or 40 V rms
    • measurement for DC and AC 45…65 Hz,


    Measurement of earth resistance (method 3- and 4-pole)
    measurement range to IEC61557 - 5: 0,30 Ω...19,9 kΩ

    Range Resolution Accuracy
    0,00...19,99 Ω 0,01 Ω
    ±(2% m.v. + 2 digits)
    20,0...199,9 Ω 0,1 Ω
    200...1999 Ω 1 Ω
    2,0k...9,99 kΩ 0,01 kΩ ±(5% m.v. + 4 digits)
    10,0k...19,9 kΩ 0,1 kΩ
    • measurement current: under short circuit >200 mA,
    • voltage on open terminals: selectable <25 V AC or <50 V AC,
    • frequency of measurement current: 125 (for networks 50 Hz) or 150 Hz (for 60 Hz),


    Measurement of continuity of equipotential bondings and protective conductors (Rcont)
    measurement range to IEC61557 - 5: 0,24 Ω...19,9 kΩ

    Range Resolution Accuracy
    0,00...19,99 Ω 0,01 Ω
    ±(2% m.v. + 2 digits)
    20,0...199,9 Ω 0,1 Ω
    200...1999 Ω 1 Ω
    2,0k...9,99 kΩ 0,01 kΩ ±(5% m.v. + 2 digits)
    10,0k...19,9 kΩ 0,1 kΩ

     

    • voltage on open terminals: <24 Vrms but >4 Vrms,
    • measurement current: under short circuit >200 mA,
    • frequency of measurement current: 125 (for networks 50 Hz) or 150 Hz (for networks 60 Hz), possible choice of measurement frequency in menu,
    • auto-zero function measurement leads

    Measurement of resistance of auxiliary electrodes RH and RS

    Range Resolution Accuracy
    0...999 Ω 1 Ω
    ±(5% (RS+RE+RH) + 8 digits)
    1,00k...9,99 kΩ 0,01 kΩ
    10,0k...19,9 kΩ 0,1 kΩ


    Measurement of multiple earth resistance with using the clamp and auxiliary electrodes (3p + clamp)
     

    Range Resolution Accuracy
    0,00...19,99 Ω 0,01 Ω
    ±(8% m.v. + 3 cyfry)
    20,0...199,9 Ω 0,1 Ω
    200...1999 Ω 1 Ω
    • voltage on open terminals: selectable <25 V AC or <50 V AC,
    • measurement current: under short circuit > 200 mA,
    • frequency of measurement current: 125 (for networks 50 Hz) or 150 Hz (for 60 Hz),


    Measurement of multiple earth resistance with using double clamps

    Range Resolution Accuracy
    0,00..19,99 Ω 0,01 Ω ±(10% m.v. + 3 digits)
    20,0...149,9 Ω 0,1 Ω ±(20% m.v. + 3 digits)
    • frequency of measurement current 125 (for networks 50 Hz) or 150 Hz (for networks 60 Hz)


    Measurement of ground resistivity
    Measurement method: Wennera, ρ=2πLRE

    Range Resolution Accuracy
    0,0...199,9 Ωm 0,1 Ωm depending on measurement
    accuracy RE with 4p method,
    but not less than ±1 digit
    200...1999 Ωm 1 Ωm
    2,00k...19,99 kΩm 0,01 kΩm
    20,0k...99,9 kΩm 0,1 kΩm
    100k...999 kΩm 1 kΩm

    L – distance between probes: 1...50 m

  • Files

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