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.

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),
  • 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

RangeResolutionAccuracy
0…100 V1 V±(2% m.v. + 3 digits)

Measurement of interference frequency

RangeResolutionAccuracy
15…450 Hz1 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

RangeResolutionAccuracy
0,000…3,999 Ω0,001 Ω±(2% m.v. + 4 digits)
4,00…39,99 Ω0,01 Ω±(2% m.v. + 2 digits)
40,0…399,9 Ω0,1 Ω
400…3999 Ω0,001 kΩ
4,00k…19,99 kΩ0,01 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

RangeResolutionAccuracy
0,000…3,999 Ω0,001 Ω±(2% m.v. + 4 digits)
4,00…39,99 Ω0,01 Ω±(2% m.v. + 2 digits)
40,0…399,9 Ω

0,1 Ω

400…3999 Ω0,001 kΩ
4,00k…19,99 kΩ0,01 kΩ±(5% m.v. + 2 digits)

Measurement of resistance of auxiliary electrodes RH and RS

RangeRangeAccuracy
0…999 Ω1 Ω±(5% (RS+RE+RH) + 8 digits)
1,00k…9,99 kΩ0,01 kΩ
10,0k…19,9 kΩ0,1 kΩ

 

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

RangeResolutionAccuracy
0,000…3,999 Ω*0,01 Ω±(8% m.v. + 4 digits)
10,0…99,9 Ω0,01 Ω±(8% m.v. + 3 digits)
100…999 Ω0,1 Ω
1,00k…1,99 kΩ1 Ω

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

Measurement of multiple earthing resistance with using double clamps

RangeResolutionAccuracy
0,00…19,99 Ω0,1 Ω±(10% m.v. + 3 digits)
20,0…149,9 Ω0,1 Ω±(20% m.v. + 3 digits)

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

RangeResolutionAccuracy
0,0…199,9 Ωm0,1 Ωmdepending on measurement
accuracy RE with 4p method,
but not less than ±1 digit
200…1999 Ωm1 Ωm
2,00k…19,99 kΩm0,01 kΩm
20,0k…99,9 kΩm0,1 kΩm
100k…999 kΩm1 kΩm

L – distance between probes: 1…50 m
 

Measurement of AC current (leakage)

RangeResolutionAccuracy
0,1…99,9 mA 10,1 mA±(8% m.v. + 5 digits)
100…999 mA 11 mA±(8% m.v. + 3 digits)
1,00…4,99 A 1,20,01 A±(5% m.v. + 5 digits)1
unspecified 2
5,00…9,99 A 1,20,01 A±(5% m.v. + 5 digits)
10,0…99,9 A 1,20,1 A
100…300 A 1,21 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 )

RangeResolutionAccuracy
0,0…99,9 Ω0,1 Ω±(2,5% m.v. + 3 digits)
100…199 Ω1 Ω

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

„m.v.”- measured value

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