The Sonel MRU-30 uses most known methods of earth resistance measurements. Tests can be performed using the 3-pole, 4-pole, 3-pole with auxiliary clamp and also, additionally, the MRU-30 employs the two clamp method of measurement, without the use of auxiliary test rods which can’t be used in some situations. Complementary features of the MRU-30 are measurements of soil resistivity, continuity measurement of protective and equipotential conductors and, using clamps, leakage currents and interference voltages.
- Robust and weatherproof (IP65) – no ingress of dust, water protected by a nozzle against enclosure from any direction.
- Ergonomic casing – small and handy casing to make the measurements more convenient than before.
- Built-in rechargeable battery – saving time to replace flat batteries; can be recharged from Power Bank and Cigarette Lighter Socket!
- Clear on-screen notes – displayed on screen before and after the measurement to alert user of possible dangers and irregularities.
- Many measurement methods available in a small, portable casing
| Weight |
5 kg |
| Dimensions |
20 × 15 × 7 cm |
Measurement of interference voltage UN (RMS)
| Range |
Resolution |
Accuracy |
| 0…100 V |
1 V |
±(10% m.v. + 1 digit) |
Measurement of continuity of equipotential bondings and protective conductors (Rcont)
measurement range to IEC 61557-4:2007: 0,13 Ω…1999 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…1999 Ω |
1 Ω |
• measurement current: under short circuit >200mA
• frequency of measurement current: 125 Hz (for networks 50 Hz) and 150 Hz (for networks 60 Hz)
Measurement of earthing resistance (method 3- and 4-pole)
measurement range to IEC 61557-5:2007: 0,53 Ω…9999 Ω (dla 50 V)
| Range |
Resolution |
Accuracy |
| 0,00…19,99 Ω |
0,01 Ω |
±(3% m.v. + 3 digits) |
| 20,0…199,9 Ω |
0,1 Ω |
| 200,0…1999 Ω |
1 Ω |
±5% m.v. |
| 2000…9999 Ω |
1 Ω |
±8% m.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 (for networks 50 Hz) or 150 Hz (for 60 Hz).
Measurement of multiple earthing esistance with using the clamp and auxiliary electrodes (3p + clamp)
| Range |
Resolution |
Accuracy |
| 0,00…19,99 Ω |
0,01 Ω |
±(3% m.v. + 3 digits) |
| 20,0…199,9 Ω |
0,1 Ω |
| 200…1999 Ω |
1 Ω |
±5% m.v. |
| 2000…9999 Ω |
1 Ω |
±8% m.v. |
• voltage on open terminals: selectable 25 V AC or 50 V AC,
• measurement current: under short circuit >20 mA,
• frequency of measurement current: 125 Hz (for networks 50 Hz) and 150 Hz (for networks 60 Hz)
Measurement of resistance of auxiliary electrodes RH i RS
| Range |
Resolution |
Accuracy |
| 0…999 Ω |
1 Ω |
±(5% m.v.+ 8 digits) |
| 1,00k…9,99 kΩ |
0,01 kΩ |
| 10,0k…19,9 kΩ |
0,1 kΩ |
Measurement of multiple earthing resistance with using double clamps
| Range |
Resolution |
Accuracy |
| 0,00…19,99 Ω |
0,01 Ω |
±(10% m.v. + 8 digits) |
| 20,0…99,9 Ω |
0,1 Ω |
±(20% m.v. + 3 digits) |
• frequency of measurement current: 125 Hz (for networks 50 Hz) and 150 Hz
(for networks 60 Hz)
Measurement of ground resistivity
Measurement method: Wenner, ρ=2πLRE
| Range |
Resolution |
Accuracy |
| 0,00…9,99 Ωm |
0,01 Ωm |
depending on measurement
accuracy RE with 4p method,
but not less than ±1 digit |
| 10,0…99,9 Ωm |
0,1 Ωm |
| 100…999 Ωm |
1 Ωm |
| 1,00…9,99 kΩm |
0,01 kΩm |
| 10,0…99,9 kΩm |
0,1 kΩm |
| 100…999 kΩm |
1 kΩm |
L – distance between probes: 1…50 m.. or 1…150 ft
Electric security:
- type of insulation: double, according to EN 61010-1 i IEC 61557,
- measurement category: CAT III 300V wg EN 61010-1,
- protection class acc. to EN 60529: IP65,
Rated operational conditions:
- operation temperature: -10…+55°C,
- storage temperature: -20…+80°C,
- humidity: 20…90%,
Other technical data:
- LCD display: segment, backlit,
- dimensions: 200x150x74 mm.
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