MRU-200
Index: WMGBMRU200
Earth Resistance and Resistivity Meter
Description
Technical Specification
Files
  • Description

    MRU-200 is the only meter in the market which uses all measurement methods.

    Possible measurements:
    • earth resistance measurment 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 probs,
    • earth resistivity measurement,
    • continuity measurement,
    • leakage current 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 earthing)
    • earth resistance using double clamps for measuring multiple earthing without underground connections,
    • impulse earth impedance (without disconnecting measured earthing),
    • ground resistivity (Wenner method),
    • 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.

    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 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 and Bluetooth*,
    • indication of battery state.

    *Bluetooth communication from serial number E30001

    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
    • number of measurements carried out of set of batteries: > 1200
    • warranty: 24 months

    Measurement of interference voltage

    Range Resolution Accuracy
    0...100 V 1 V ±(2% m.v. + 3 digits)

    Measurement of interference frequency

    Range Resolution Accuracy
    15...450 Hz 1 Hz ±(1% m.v. + 2 digits)

    Measurement of earthing resistance (method 3- and 4-pole)
    measurement range to IEC61557 - 5: 0,100 Ω...19,9 kΩ

    Range Resolution Accuracy
    0,000...3,999 Ω 0,001 Ω ±(2% m.v. + 4 digits)
    4,00...39,99 Ω 0,01 Ω ±(2% m.v. + 2 digits)
    40,0...399,9 Ω 0,1 Ω
    400...3999 Ω 0,001 kΩ
    4,00k...19,99 kΩ 0,01 kΩ ±(5% m.v. + 2 digits)


    Measurement of continuity of equipotential bondings and protective conductors (Rcont)
    measurement range to IEC61557 - 4: 0,045 Ω...19,99 kΩ

    Range Resolution Accuracy
    0,000...3,999 Ω 0,001 Ω ±(2% m.v. + 4 digits)
    4,00...39,99 Ω 0,01 Ω ±(2% m.v. + 2 digits)
    40,0...399,9 Ω

    0,1 Ω

    400...3999 Ω 0,001 kΩ
    4,00k...19,99 kΩ 0,01 kΩ ±(5% m.v. + 2 digits)

    Measurement of resistance of auxiliary electrodes RH and RS

    Range Range 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 earthing resistance with using the clamp and auxiliary
    electrodes (3p + clamp)

    Range Resolution Accuracy
    0,000...3,999 Ω* 0,01 Ω ±(8% m.v. + 4 digits)
    10,0...99,9 Ω 0,01 Ω ±(8% m.v. + 3 digits)
    100...999 Ω 0,1 Ω
    1,00k...1,99 kΩ 1 Ω

    * - in range 0,000…0,045 Ω the accuracy is not specified.

    Measurement of multiple earthing resistance with using double clamps

    Range Resolution Accuracy
    0,00...19,99 Ω 0,1 Ω ±(10% m.v. + 3 digits)
    20,0...149,9 Ω 0,1 Ω ±(20% m.v. + 3 digits)

    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
     

    Measurement of AC current (leakage)

    Range Resolution Accuracy
    0,1...99,9 mA 1 0,1 mA
    ±(8% m.v. + 5 digits)
    100...999 mA 1 1 mA ±(8% m.v. + 3 digits)
    1,00...4,99 A 1,2 0,01 A ±(5% m.v. + 5 digits)1
    unspecified 2
    5,00...9,99 A 1,2 0,01 A ±(5% m.v. + 5 digits)
    10,0...99,9 A 1,2 0,1 A
    100...300 A 1,2 1 A

    1 – receiving clamp (diameter 52 mm) – C-3
    2 – flexible clamp (Rogowsky coil) with diameter 400 mm – F-1


    Measurement of dynamic earthing resistance (RD) with impulse wave method (4p )

    Range Resolution Accuracy
    0,0...99,9 Ω 0,1 Ω
    ±(2,5% m.v. + 3 digits)
    100...199 Ω 1 Ω

    choice impulse edges: 4/10μs, 8/20μs, 10/350μs

    „m.v.”- measured value

  • Files

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