The Saturn Geo X Earth Ground Tester is ideal for measurement of ground resistance using the classic fall of potential test, as well as the ‘selective’ and ‘stakeless’ test. The ‘selective’ method does not require the electrode under test to be disconnected before measurement, unlike other methods. The ‘stakeless’ method is quick and simple and replaces stakes with current transformers (probes) that are clamped around the ground conductor under test. Both techniques make it faster and safer to test.

Earth ground resistance and resistivity should be measured when:

• Installing new ground system and electrical equipment
• Periodically testing ground and lightning protection rods
• Prior to design of ground protection systems
• Installing distribution equipment – transformers, switchgear etc.
• Conventional three and four pole earth ground testing
• Innovative selective and stakeless techniques for fast and safe measurement without disconnection
• Two-pole ac resistance measurement
• Four- and two-pole dc resistance measurement
• One button measurement – automatic hold of last set of measurements
• Limit for verification of measurements
• Automatic frequency control (AFC) for stable measurements
• R* measurements at 55Hz for impedance in electricity distribution systems
• Rugged housing rated to IP56
• Full range of accessories for conventional and clamp testing
• 2-Year warranty

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. All measured data, as well as the time-of-day the measurement was taken, can be sent to computer or printed via an RS-232C interface.

• Earthing resistance 3-pole and 4-pole of 0.001O...300kO, 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 0.001O...300 kO
• 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 O...3 kO with automatic polarity reversing and high short-circuit current as per IEC 61557-4
• Display illumination
• Serial interface (RS 232, optional)
• PC-Software WINGEO as an option
• Automatic determination of auxiliary earth electrode- and proberesistance
• Displays all measuring results for as long as desired
• Programmable LIMITS - optical and acoustical warning at limit infringement
• Long battery service-life because of short-time-measuring method and automatic switch-off
• Operator quick reference on rear of instrument
• Splashproof case IP56 (outdoor application)
• Developed, designed and manufactured as per DIN ISO 9001
• Measurements with current clamps: Selective, stakeless
• Resistance measurements with 250mA short circuit current
• Output of measured values via interface on printer or PC
• Measuring protocol via PC-software