Sonel MRU-20 接地电阻/电阻率仪

 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 U_n=50V;
0,68Ω...1,99kΩ dla U_n=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 R_H i R_S

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 U_N (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