MRU-200-GPS Earth Ground Resistance and Resistivity Meter
Earth Ground Resistance Meter MRU-200-GPS
Price: $3207
Description
Technical specification
Files
  • Description

    THE MRU-200-GPS OFFERS A VARIETY OF MEASUREMENT METHODS FOR GROUND RESISTANCE AND RESISTIVIY

    The MRU-200-GPS is the only meter which can perform all ground resistance measurement methods; 2-pole, 3-pole, 4-pole, and impulse earth impedance methods.

    • » Ground resistance using auxiliary electrodes, or with electrodes and clamp for measurements in the presence of multiple ground paths
    • » Ground resistance using double clamps when it is not possible to use auxiliary electrodes 
    • » Impulse ground resistance without disconnecting measured grounding
    • » Soil resistivity using Wenner method
    • » Leakage current using current clamp or flexible Rogowsky probe
    • » Measurement of continuity of equipotential bonding and protective conductors (meets IEC 60364-6-61:2000 section 6.12.2) with auto-zero function and 200 mA current
     
    KEY FEATURES:
    • » Ground resistance measurement, with 2-pole, 3-pole, or 4-pole methods
    • » Leakage current measurement
    • » Selective measurement with clamp excludes  influence from parallel ground points
    • » No opening of rusted conductors needed
    • » Impulse ground resistance measurement at 4/10 µs, 8/20 µs, or 10/350 µs
    • » Two clamps resistance measurement method without auxiliary test probes
    • » GPS coordinates of measurement location are stored with test results
     
    OTHER FUNCTIONS & FEATURES
    • » Resistance measurement of auxiliary electrodes
    • » Measurement of interference voltage and interference frequency
    • » Measurement in the presence of interference voltages at 162/3 Hz, 50 Hz, 60 Hz, and 400 Hz 
    • » Automatic or manual selection of frequency of measuring signal 
    • » Selection of maximum measuring voltage (25 V and 50 V)
    • » Distance between the electrodes noted in meters (m) and feet (ft)
    • » Memory storage for 990 measurements
    • » Calibration information of test clamp(s)
    • » Real-time clock
    • » USB interface for PC connection
    • » Internal battery with indication of state of charge
    • » Backlit LCD graphic display
     
    ELECTRICAL SAFETY
    • » Double insulated meets IEC 61010-1 and IEC 61557 standards CAT IV 300 V

    Earth Ground Resistance Measurement - Fall of Potential Method with and without current probe

     

    There is an offline simulator of MRU 200 GPS ready to download in the Files section.

     

    Test drive the MRU 200 GPS with this Online Simulator:

     

    There is also an offline simulator of MRU 200 GPS ready to download in the Files section.

  • Technical specification

    Multiple measurement possibilities: 

    • earth resistance using auxiliary electrodes,
    • earth resistance using auxiliary electrodes and current clamp for measurements of multiple earth ground points
    • earth resistance using double current clamps for measurement of earth ground when it is impossible to use  electrodes in the ground
    • impulse earth impedance for lightning without disconnecting measured earthing
    • ground resistivity (Wenner method),
    • current using current clamp (e.g. leakage) and flexible current probe (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),
    • 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: 14F to 122F / -10 to +50°C
    • storage temperature: -4F to 158F / -20 to +70°C
    • humidity: 20 to 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 to 100 V 1 V ±(2% m.v. + 3 digits)

    Measurement of interference frequency

    Range Resolution Accuracy
    15 to 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 to 19.9 kΩ

    Range Resolution Accuracy
    0.000 to 3.999 Ω 0.001 Ω ±(2% m.v. + 4 digits)
    4.00 to 39.99 Ω 0.01 Ω ±(2% m.v. + 2 digits)
    40.0 to 399.9 Ω 0.1 Ω
    400 to 3,999 Ω 0.001 kΩ
    4.00k to 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 to 19.99 kΩ

    Range Resolution Accuracy
    0.000 to 3.999 Ω 0.001 Ω ±(2% m.v. + 4 digits)
    4.00 to 39.99 Ω 0.01 Ω ±(2% m.v. + 2 digits)
    40.0 to 399.9 Ω

    0.1 Ω

    400 to 3,999 Ω 0.001 kΩ
    4.00k to 19.99 kΩ 0.01 kΩ ±(5% m.v. + 2 digits)

    Measurement of resistance of auxiliary electrodes RH and RS

    Range Range Accuracy
    0 to 999 Ω 1 Ω
    ±(5% (RS+RE+RH) + 8 digits)
    1.00k to 9.99 kΩ 0.01 kΩ
    10.0k to 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 to 3.999 Ω* 0.01 Ω ±(8% m.v. + 4 digits)
    10.0 to 99.9 Ω 0.01 Ω ±(8% m.v. + 3 digits)
    100 to 999 Ω 0.1 Ω
    1.00k to 1.99 kΩ 1 Ω

    * - in range 0.000 to 0.045 Ω the accuracy is not specified.

    Measurement of multiple earthing resistance with using double clamps

    Range Resolution Accuracy
    0.00 to 19.99 Ω 0.1 Ω ±(10% m.v. + 3 digits)
    20.0 to 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 to 199.9 Ωm 0.1 Ωm depending on measurement
    accuracy RE with 4p method,
    but not less than ±1 digit
    200 to 1999 Ωm 1 Ωm
    2.00k to 19.99 kΩm 0.01 kΩm
    20.0k to 99.9 kΩm 0.1 kΩm
    100k to 999 kΩm 1 kΩm

    L – distance between probes: 1 to 150 ft / 1 to 50 m
     

    Measurement of AC current (leakage)

    Range Resolution Accuracy
    0.1 to 99.9 mA 1 0.1 mA
    ±(8% m.v. + 5 digits)
    100 to 999 mA 1 1 mA ±(8% m.v. + 3 digits)
    1.00 to 4.99 A 1,2 0.01 A ±(5% m.v. + 5 digits)1
    unspecified 2
    5.00 to 9.99 A 1,2 0.01 A ±(5% m.v. + 5 digits)
    10.0 to 99.9 A 1,2 0.1 A
    100 to 300 A 1,2 1 A

    1 – receiving clamp (diameter 2" / 52 mm) – C-3
    2 – flexible clamp (Rogowsky coil): F-1 diameter 14" / 360 mm; F-2: diameter 9" / 235 mm; F-3: diameter 4.7" / 120 mm


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

    Range Resolution Accuracy
    0.0 to 99.9 Ω 0.1 Ω
    ±(2,5% m.v. + 3 digits)
    100 to 199 Ω 1 Ω

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

    „m.v.”- measured value

  • Files

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