MRU-21 Earth Resistance Meter WMGBMRU21

Measurement of earthing resistance
measurement range to IEC61557 – 5:
0,50 Ω…1,99 kΩ for Un=50 V;
0,68 Ω…1,99 kΩ for Un=25 V;

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

• measurement current: under short circuit >20 mA,
• voltage on open terminals: selectable <25 V AC or <50 V AC,
• frequency of measurement current: 125 Hz

Measurement of interference voltage U_N (RMS)

Range	Resolution	Accuracy
0…100 V	1 V	±(2% m.v. + 3 digits)

• measurement for DC and AC 45…65 Hz

Measurement of resistance of auxiliary electrodes R_H i R_S

Range	Resolution	Accuracy
0…999 Ω	1 Ω	±(5% (RS+RE+RH) + 3 digits)
1,00k…9,99 kΩ	0,01 kΩ
10,0k…50,0 kΩ	0,1 kΩ

Measuremet of continuity of equipotential bondings and protective conductors
measurement range to IEC61557 – 4: 0,13 Ω…199 Ω

Range	Resolution	Accuracy
0,00…9,99 Ω	0,01 Ω	±(2% m.v. + 3 digits)
10,0…99,9 Ω	0,1 Ω
100…199 Ω	1 Ω

• measuring method: technical 2-pole method,
• max. voltage on open terminals: 13 V,
• measurement current: under short circuit >200 mA,
• auto-zero function for measurement leads

Electric security:

• type of insulation: double, according to EN 61010 – 1and IEC 61557
• measurement category: CAT IV 300 V acc. to EN 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:

• LCD display: segment, backlit
• interface: USB,
• number of measurements carried out of set of batteries: > 1000 (5 Ω, 2 meas./min.)
• warranty: 2 years
• dimentions: 288 x 223×75 mm
• weigth: 1,4 kg