Earth Resistance and Resistivity Meters MRU 105/106

• 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

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

Measurement of ground resistivity: