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.
- 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 RH i RS 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 |
