VI-Compensation for errors of the quadrant electrometer in the measurement of power factor

In a previous paper, the writers developed the equations for the main errors in the quadrant electrometer for the measurement of power factor, and checked their equations experimentally, the main sources of error being the unavoidable shunting capacity to ground of the test specimens and the charging current from the electrometer needle to the quadrants. In the present paper, methods of experimental compensations and elimination of these sources of error are described. Methods of compensation for capacity to ground have been presented before, and in this paper merely some additional refinements are given. The method of compensation for errors due to the charging current in the needle circuit is believed to be new; the method is described herein, the equation is derived in full, and an experimental check is given of the accuracy of the equation.