A direct reading phase angle meter.

A meter is constructed for the measurement of phase differences of voltages in the lover audio range. This meter possesses many distinct advantages over the prevailing types in range, accuracy, and ease of operation. To test the meter, calculations are made of the phase change in a transmission line at various frequencies, and the results checked with the readings on the phase meter. A very good agreement was found between experimental and predicted values. In the construction of the meter two voltages 90° out of phase are required. These are obtained by the use of a three phase oscillator and Scott transformer connection. This method is selected as it will not spoil the adjustment of the phase meter with frequency change