Electricity meter checking device - comprises portable case housing meter with digital read=out and calibrated current generator

摘要

The device comprises a case with four connecting leads which are to be attached to the input and output of the domestic electricity meter. The electricity meter must have an isolating switch to disconnect any load from the meter. The case includes circuitry producing a calibrated current at one of a number of set levels - 5,10,15,20,30,40 and 60 A - according to the position of a switch. One the top of the case is a seven-digit display giving a reading to show the energy consumed when one of the set currents has been produced, as measured by the internal circuit of the case. To test a meter in situ the case is linked to the meter by its four leads, and a number of currents are produced in turn to check operation over a range of values up to a maximum of 60 A.