Transcription of Getting Down to Earth - Electronic Test Equipment
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Getting Down to Earth - Electronic Test Equipment
Getting down to EarthA practical guide to Earth resistance testingTest Equipment Depot - - 5 Commonwealth Ave - Woburn MA 01801 Getting down to EarthIntroductionNothing is quite so common or abundantly available throughout the world as the Earth s soil. While you likely think of soil as something to be tilled for planting or to be excavated for a building foundation, it also has an electrical property conductivity (or low resistance) that is put to practical use every day in industrial plants and speaking, Earth resistance is the resistance of soil to the passage of electric current. In reality, the Earth is a relatively poor conductor of electricity compared to normal conductors like copper wire.
To measure earth resistivity, a four-terminal instrument is used, along with four small-sized electrodes - driven down to the same depth and equal distances apart in a straight line (Fig. 1). Four separate lead wires connect the electrodes to the four terminals on the instrument, as shown. Hence, the name of this test: the four-terminal method.
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