HANNOVER MESSE 2018,
23 - 27 April
The EM4058 earth tester is a digital, microprocessor controlled, instrument that allows to measure the earth resistance and ground resistivity (using Wenner s method), as well as to detect parasitic voltages present in the ground. This instrument is suitable to measure earth systems in power substations, industries, distribution networks, etc., according to IEC 61557-5.It is also suitable for soil resistivity measurements in order to optimize the earth systems project. It is a fully automatic and easy-to-operate equipment. Before starting each measurement, the equipment will check that conditions are within appropriate limits and will notify the operator in case any abnormality turns up (too high interference voltage, too much resistance in test spikes, very low test current, etc). Then, it will look for the most suitable range and show measurement results in an alphanumeric display.In order to conveniently test the earth system, EM4058 allows performing measurements using the test current which frequency may be operator-selected (270 Hz, 570 Hz, 870 Hz, 1170 Hz or 1470 Hz). On one hand, the lowest frequency will allow to analyze the earth system behavior related to fault currents of industrial frequency, while on the other hand, the measurement performed with the highest frequency will best show the behavior in connection with electrical currents caused by lightning and will offer a very high immunity related to interference voltages that are usually present in soils, especially near substations.The EM4058 has a frequency scan feature that performs an earth resistance measure with all available frequencies automatically and calculates, displays and prints the average result besides the individual result of each frequency. Those results are saved on the internal memoryThe instrument has four ranges that are automatically selected, covering measurements from 0.01 Ohm up to 20 k Ohm, which allows obtaining very accurate measurements for any kind of soils.
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