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UA EN

MRU-30 Earth resistance and resistivity meter

MRU-30 is designed to measure single and multiple earthings using auxiliary electrodes and/or clamps. Moreover it is possible to measure ground resistivity (Wenner method) and verify the continuity of equipotential bondings and protective conductors.

Manufacturer: SONEL S.A. (Poland).

Description

Device capabilities
The meter provides the ability to make grounding tests with all kinds of the technical method. High immunity to interference allows it to be used even in difficult conditions in circuits with interfering currents. Simple and intuitive operation makes the measurements easier and faster. The meter has internal memory. The measurement results can be transmitted to a computer for data processing and preparation of documentation from the grounding tests.

Durable and practical casing
Ergonomic, small and practical housing allows comfortable and easy operation. The meter is resistant to all weather conditions. IP65 ingress protection guarantees dustproof and resistance to water jets on each side. The battery is permanently built-in and can be charged from a PowerBank or car cigarette lighter.
Features
  • Measurement of auxiliary electrode resistances RS and RH
  • Measurement of interference voltage
  • Measurement in the presence of interference voltages in networks with frequencies of 50 Hz and 60 Hz
  • Selection of maximum measurement voltage (25 V and 50 V)
  • In ground resistivity measurements, distances between electrodes can be input in meters (m) or feet (ft)

Earthing resistance measurement (3- and 4-lead method) (0,53 Ω...9999 Ω (for 50 V))

Range

Resolution  

Accuracy

0...19.99 Ω

0.01 Ω

±(3% m.v. + 3 digits)

20.0...199.9 Ω

0.1 Ω

200...1999 mΩ

1 Ω

±5% m.v.

2000...9999 mΩ

1 Ω

±8% m.v.

Resistance measurement of multiple earthing systems with two clamps

Range

Resolution

Accuracy

0...19.99 Ω

0.01 Ω

±(10% m.v. + 8 digits)

20.0...199.9 Ω

0.1 Ω

±(20% m.v. + 3 digits)

Resistance measurement of multiple earthing systems with clamp and auxiliary electrodes (3-lead + clamp)

Range

Resolution

Accuracy

0...19.99 Ω

0.01 Ω

±(3% m.v. + 3 digits)

20.0...199.9 Ω

0.1 Ω

200...1999 mΩ

1 Ω

±5% m.v.

2000...9999 mΩ

1 Ω

±8% m.v.

Ground resistivity measurement (Wenner method, ρ=2πLRE)

Range

Resolution

Accuracy

0...199.9 Ωm

0.1 Ωm

depends on accuracy of RE measurement
in 4-lead system, but no lower than ±1 digit

200...1999 Ωm

0.1 Ωm

2.00...19.99 kΩm

0.01 kΩm

20.0...99.9 kΩm

0.1 kΩm

100...999 kΩm

1 kΩm

Measurement of interference voltage UN (RMS) (0.13 Ω...1999 Ω)

Range

Resolution

Accuracy

0...100 V

1 V

±(5% m.v. + 2 digits)

Measurement of auxiliary electrode resistances RH and RS

Range

Resolution

Accuracy

0...999 Ω

1 Ω

±(5%(RS+RE+RH) + 8 digits)

1.00...9.99 Ωm

0.01 kΩ

10.0...19.9 kΩm

0.1 kΩ

Continuity test of protective and equalizing connections (0.13 Ω...1999 Ω)

Range

Resolution

Accuracy

0...9.99 Ω

0.01 Ω

±(2% m.v. + 3 digits)

10.0...99.9 Ω

0.1 Ω

100...1999 Ω

1 Ω

Technical specification

Insulation type

double, according to EN 61010-1 and IEC 61557

Measurement category

III 300 V acc. to EN 61010-1

Ingress protection according to EN 60529

IP65

Operating temperature range

-10...+50°C

Storage temperature

-20...+60°C

Humidity

20...90%

LCD display

segmented, with backlighting

Dimensions

200 x 150 x 73 mm

Weight

1.14 kg

Standard accessories:

  • MRU-30
  • Test lead with banana plugs; 1 kV; 1.2 m; red
  • Test probe with banana socket; 1 kV; red
  • Earth contact pin probe (30 cm)
  • Meter power adapter (type Z7)
  • USB cable
  • Earthing measurement test lead with banana plugs on reel; 25 m; red
  • Black “crocodile” clip 1 kV 20 A
  • Camp terminal with banana plug termination
  • 230 V power cord (IEC C7 plug)
  • Earthing measurement test lead with banana plugs on reel; 50 m; yellow
  • Test lead with banana plugs; 1 kV; 2.2 m; black
  • M-9 carrying case
  • L-10 carrying case
  • Sonel Reader PC software

Optional accessories:

  • Test lead 75 / 100 / 200 m red, for MRU (banana plugs, on a reel)
  • Test lead 75 / 100 / 200 m blue, for MRU (banana plugs, on a reel)
  • Test lead 75 / 100 / 200 m yellow, for MRU (banana plugs, on a reel)
  • Test lead 30 m, red, for MRU (banana plugs, on a reel)
  • Test lead 15 / 25 m blue, for MRU (on a reel)
  • Test wire reel
  • Earth contact test probe (rod), 15 cm
  • Earth contact test probe (rod), 26 cm
  • Earth contact test probe (rod), 80 cm
  • Crocodile clip, 1 kV 20 A red /blue/yellow
  • Test lead 1.2 m CAT III/1000V CAT IV/600V black/blue/yellow
  • Pin probe CAT III/1000V CAT IV/600V black/blue/yellow
  • N-1 transmitting clamp (Φ=52 mm)
  • C-3 current clamp (Φ=52 mm)
  • Dattery charging cable for 12 V car sockets
  • Double-wire test lead 2 m, for N-1 clamps (banana plugs)
  • L3 carrying case for 80 cm rods
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