MRU-200 EARTH RESISTANCE METER

MRU-200 allows to take measurments of:

- earthing resistance using auxiliary electrodes,
- earthing resistance using auxiliary electrodes and clamp
(for measurements of multiple earthing)
- earthing resistance using double clamps (for measurement of earthing
when it is impossible to use auxiliary electrodes),
- impulse earth resistance (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 200mA.

In Addition:

- measurement of resistance of auxiliary electrodes R and R , S H
- 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, 50Hz, 60Hz and 400Hz (with automatic selection
of proper frequency of measuring signal or with manual selection),
- selection of maximum measuring voltage (25V and 50V)
- 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.

Measurement of interference voltage

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

Measurement of interference frequency

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

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

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

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

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

* - in range 0,000…0,045Ω the accuracy is not specified. Measurement of resistance of auxiliary electrodes RH and RS

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


Measurement of multiple earthing resistance with using the clamp and auxiliary electrodes (3p + clamp) measurement range to IEC61557-5: 0,120Ω...1999Ω

Range
Resolution
Accuracy
0,00...3,999Ω *
0,001Ω
±(8% m.v. + 4 digits)
4,0...39,99Ω
0,01Ω
±(8% m.v. + 3 digits)
40...399,9Ω
0,1Ω
400...1999Ω

* - in range 0,000…0,045Ω the accuracy is not specified. Measurement of multiple earthing resistance with using double clamps

Range
Resolution
Accuracy
0,00...19,99Ω
0,01Ω
±(10% m.v. + 3 digits)
20,0...149,9Ω
0,1Ω
±(20% m.v. + 3 digits)

Measurement of ground resistivity Measurement method: Wenner, p=2πLRE

Range
Resolution
Accuracy
0,0...199,9Ωm
0,001Ω
depending on measurement
accuracy R with 4p method, E
but not less than ±1 digit
200...1999Ωm
0,01Ω
2,00k...19,99kΩm
0,1Ω
20,0k...99,9kΩm
100k...999kΩm
1kΩm

L – distance between probes: 1...50m

Measurement of AC current (leakage)

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

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

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

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

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

„m.v.”- measured value

Electric security:

type of insulation double, according to EN 61010-1 and IEC 61557
measurement category CAT IV 300V 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

 

 

 

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