Calibration of a 10 : 1 ratio transformer using Thompson's method

The results are reported from the calibration, using Thompson's method, of a 10 : 1 ratio transformer which will be used for setting up scales of capacitance at the Electrotechnical Laboratory, Tsukuba. The deviation of the ratio from the nominal value of 10 : 1 was measured as -1.37 × 10-7 for the in-phase component and -7,22 × 10-7 for the quadrature component, with the transformer operated at a frequency of 1592 Hz with an rms applied voltage of 100 V. The uncertainties of the measurement were estimated to be 5 × 10-9 for the in-phase component and 1,2 × 10-8 for the quadrature component.