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The MRU-105 and MRU-106 (for 60Hz) are portable meters for the earth resistance and earth resistivity measurement (Wenners method). The instruments can measure resistance using 2, 3, or 4 poles method. Measurements can be simplified using current clamps. The very high immunity for existing interference voltage AC + DC at which measurement is still performed: 24V (68V-p-p) but also measurement of existing interference voltage up to 40V is unique functionality of the meters. Moreover meters measure the resistance of the probes and calculate automatically the error coming from probe's resistances.
The meters MRU-105 and MRU-106 (for 60Hz) additionaly can be powered from Ni-MH batteries or standard C size, and the test results can be stored in the internal memory and transmited to PC via USB - cable.

MRU-105 Technical Specifications

Measurement of earthing resistance using a three- or four- pole technique:
- ability to perform measurements of multiple earthing system using three-pole
technique without disconnecting earth system measured (with the application of clamps),
- supervision of the measurement conditions (eg. voltages, impact resistance measurement electrodes R_H i R_S and battery state/monitor)
- high immunity of interference voltage.
Measurement of ground resistivity (Wenner’s method):
- the earth resistivity measurement with the possibility to introduce the distance between electrodes, automatic calculation and displaying the resistivity.
Measurement of resistance using a two- or four-pole technique.
Built-in battery charger.
Memory for 300 measurement results with an ability to transfer the data to a PC.
Meter meets the requirements of the standard EN 61557.

Electric security:
- type of insulation: double, according to EN 61010-1 and IEC 61557
- measurement category: CAT III 300V acc. to EN 61010-1
- protection class acc. to EN 60529: IP54

Other technical data:
- power supply: alkaline batteries LR14 (C) (5 pcs.) or Ni-MH battery package
- charger power supply: 100...250V, 50...60Hz
- display: LCD, 20mm high

Rated operational conditions:
- operating temperature: 0...+40°C
- maximum interference voltage AC + DC, at which the measurement is still performed: 24V (68Vp-p)
- test current for resistance value ≤ 100Ω: 225mA
- maximum measured voltage: 40V
- test current frequency: 128Hz

Measurement of earthing resistance:
measurement range in accordance with IEC61557-5: 0,12Ω...20kΩ

Range	Resolution	Accuracy
0,00...9,99Ω	0,01Ω	±(3% m.v. + 3 digits)
10,0...99,9Ω	0,1Ω	±(2% m.v. + 2 digits)
100...999Ω	1Ω
1,00...9,99kΩ	0,01kΩ
10,0...20,0kΩ	0,1kΩ

Measurement of earthing resistance using clamps:
measurement range in accordance with IEC61557-5: 0,16Ω...20kΩ

Range	Resolution	Accuracy
0,00...9,99Ω	0,01Ω	±(8% m.v. + 3 digits)
10,0...99,9Ω	0,1Ω	±(8% m.v. + 2 digits)
100...999Ω	1Ω
1,00...9,99kΩ	0,01kΩ
10,0...20,0kΩ	0,1kΩ

Measurement of ground resistivity:

Range	Resolution	Accuracy
0,00...9,99Ωm	0,01Ωm	±(3% m.v. + 3 digits)
10,0...99,9Ωm	0,1Ωm	±(2% m.v. + 2 digits)
100...999Ωm	1Ωm
1,00...9,99kΩm	10Ωm
10,0...99,9kΩm	100Ωm
100...999kΩm	1kΩm