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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.

Possible measurements:

· earth resistance measurement with 3-pole,4-pole method,

· earth resistance measurement without disconnecting measured earths (using clamp),

· continuity of equipotential bondings and protecting conductors

· two clamps earth resistance measurement without auxiliary test probs,

· earth resistivity measurement.

MRU-200 is the only meter in the market which uses all measurement methods.

Possible measurements:

· earth resistance measurement with 2-pole, 3-pole,4-pole method,

· impulse earth impedance measurement, three kinds of measuring impulse 4/10μs, 8/20μs, 10/350μs,

· earth resistance measurement without disconnecting measured earths (using clamp),

· two clamps earth resistance measurement without auxiliary test probs,

· earth resistivity measurement,

· continuity measurement,

· leakage current measurement.