Earthing System Testing Services
Price On RequestGENERAL DESCRIPTION NIPPEN Earth Tester is a completely self contained instrument designed to give accurate measurement of earth electrode resistance, soil resistivity, earth continuity and neutral Earth loop tests for IEE wiring regulations. An AC brushless generator is used to provide alternating current which is passed through the soil to overcome interference from stray currents. An electronic converter is used to convert AC to DC for measurements. The basic system employed in this instrument incorporates a hand driven AC generator to pass a test current between earth electrode under test and a current electrode. The potential drop across the test electrode and a separate intermediate electrode i.e. P1 P2 is rectified and passed to a moving coil microammeter. TO MAKE A TEST Connect the instrument for the particular test required as described later. Set the Range Selector to highest range, if any. Rotate the generator handle at 160 RPM and observe the ohmmeter deflection. If the ohmmeter deflection is very low, change the Range Selector to the next lower range. WARNING : As a precaution, when working near high tension systems where accidental high potentials on the structure and in the ground are possible, it is recommended to wear rubber gloves. TESTING EARTH ELECTRODES (a) Normal Method of Test Join together terminals C1 P1 and connect a lead from them to the Earth electrode under test E as shown in (Fig. 1) keep this lead as short as possible, since its resistance will be included in the test.