Máy đo điện trở đất và điện trở suất Sonel MRU-20
- Hãng sản xuất: Sonel
- Model: MRU-20
- Xuất xứ: Ba Lan
Possible measurements:
- earth resistance measurment with 3-pole method,
- measurement of continuity of equipotential bondings and protective conductors with auto-zero function - with current 200mA,
- resistance measurement using 2-pole method.
Additionally:
- AUTO-OFF function after 5 minutes,
- indication of battery state.
It allows to take: earth resistance measurement using auxiliary probes with 3-pole method,resistance measurement using 2-pole method,measurement of continuity of equipotential bondings and protective conductors (meeting the requirements of IEC 61557-4) with auto-zero function – with current 200mA.
Additionally:AUTO-OFF function after 5 minutes,indication of battery state.
Measurement of earthing resistance: measurement range to IEC61557-5: 0,50Ω...1,99kΩ Un=50V;0,68Ω...1,99kΩ dla Un=25V
| Range | Resolution | Accuracy |
| 0,00...9,99Ω | 0,01Ω | ±(2% m.v. + 3 digits) |
| 10,0...99,9Ω | 0,1Ω | |
| 100...999Ω | 1Ω | |
| 1,00...19,9kΩ | 0,01kΩ |
• measurement current: under short circuit >20mA,
• voltage on open terminals: selectable 25V AC or 50V AC,
• frequency of measurement current: 125Hz
Measurement of resistance of auxiliary electrodes RH i RS
| Range | Resolution | Accuracy |
| 0...999Ω | 1Ω | ±(5% (RS+RE+RH) + 3 digits) |
| 1,00k...9,99kΩ | 0,01kΩ | |
| 10,0k...50,0kΩ | 0,1kΩ |
Measurement of interference voltage UN (RMS)
| Range | Resolution | Accuracy |
| 0...100V | 1V | ±(2% m.v. + 3 digits) |
Measuremet of continuity of equipotential bondings and protective conductors
measurement range to IEC61557-4: 0,13...199Ω
| Range | Resolution | Accuracy |
| 0,00...9,99Ω | 0,01Ω | ±(2% m.v. + 3 digits) |
| 10,0...99,9Ω | 0,1Ω | |
| 100...199Ω | 1Ω |
- measuring method: technical 2-pole method,
- max. voltage on open terminals: 13V,
- measurement current: under short circuit >200mA,
- auto-zero function for measurement leads0,13Ω...199Ω
Electric security:
- type of insulation: double, according to IEC 61010-1and IEC 61557
- measurement category: CAT IV 300V acc. to IEC 61010-1
- protection class acc. to EN 60529: IP54
Rated operational conditions:
- operation temperature: -10...+55°C
- storage temperature: -20...+70°C
- humidity: 20...80%
Other technical data:
- power supply: alkaline batteries or NiMH rechargeable batteries, size AA (8 pcs)
- LCD display: segment, backlit
- weight with batteries: approx. 1,3kg
- dimensions: 260 x 190 x 60mm
- electromagnetic compatibility: according to IEC 61000-6-3 and IEC 61000-6-2
