MRU-20

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.

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 200 mA.

Additionally:

• AUTO-OFF function after 5 minutes,
• indication of battery state.

Measurement of earthing resistance
measurement range to IEC61557 – 5:

• 0,50 Ω…1,99 kΩ U_n=50 V;
• 0,68 Ω…1,99 kΩ dla U_n=25 V

• 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 resistance of auxiliary electrodes R_H i R_S

Measurement of interference voltage U_N (RMS)

Measuremet of continuity of equipotential bondings and protective conductors
measurement range to IEC61557 – 4: 0,13…199 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 leads0,13 Ω…199 Ω

Electric security:

• type of insulation: double, according to IEC 61010 – 1and IEC 61557
• measurement category: CAT IV 300 V 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. 1,3 kg
• dimensions: 260 x 190 x 60 mm
• electromagnetic compatibility: according to IEC 61000 – 6 – 3 and IEC 61000 – 6 – 2