MRU-21   

Catalog index: WMGBMRU21

Earth Resistance Meter

 

      

Possible measurements:

  • earth resistance measurment with 3-pole method,
  • measurement of continuity of equipotential bondings and protective conductors with auto-zero function – with current 200 mA,
  • resistance measurement using 2-pole method.

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 UN (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 RH i RS

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

Data Sheet                                      

User Manual                                   

Declarations of conformity          

 

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