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At the locations involving the generation, distribution and consumption of electrical energy, certain safety measures must be met in order to protect human life. In many cases, these safety measures are national and international regulations which must be checked regularly. Earthing, the connection of exposed conductive parts to the earth in case of a fault, represents the most fundamental safety measure.

Real life requires the earthing of transformers, high and medium voltage power pylons, railway tracks, tanks, vats, foundations and lightning protection systems. Large fields of applications, the seasonal variations of the earth resistance, variations from weather and ground conditions, require test instrument able to collect and document additional information in order to ensure that the conditions under which the measurement was taken are known and that the results are reproducible. Finally, the device must provide all of this information reliably with the greatest possible simplicity and ease of use.

The SATURN GEO X provides the perfect solution by combining the latest technology and years of LEM experience into a compact, field-rugged and extremely easy to use instrument. In addition to performing standard 3- and 4-pole earth resistance measurements, an innovative process accurately measures individual earth electrode resistances in single and meshed earthed systems without disconnecting any parallel electrodes! One specific application of this capability is quick and accurate measurement of power pylon grounds.

The SATURN GEO (X) also incorporates the first truly automatic frequency control (AFC) to minimise interference. Before measuring, the instruments identify existing interference and select a measurement frequency to minimise its effect. The SATURN GEO (X) incorporates microprocessor controlled automatic measurements including checking probe hookup to ensure measurements are taken correctly and measuring all probe ground resistances to ensure reliable, repeatable results. Probe resistance and auxiliary earth resistance are also measured and displayed.

Earthing resistance 3-pole and 4-pole of 0.001?...300k?, with voltages of 20 V/48 V AC, with frequencies of 94, 105, 111, 128 Hz or AFC (Automatic Frequency Control), with automatic test of test lead connection and adjustable limit values Resistance 2-pole AC 0.001?...300 k? Noise voltage up to 50 V, noise frequency.

Measurement of the earthing impedance of electricity pylons Selective measurement of individual earth electrode resistance in interlinked or parallel ground systems (i.e. power pylons, grounding grids, lightning protection systems) without influence from other grounds. Low resistance 2- and 4-pole 0.001 ?...3 k? with automatic polarity reversing and high short-circuit current as per IEC 61557-4 Stakeless earth testing is carried out using the clamp method.