Methods of test for determining distortion factor

Following the presentation of the suggested definition of distortion factor given above, the Instruments and Measurements Committee presented at the meeting of the Standards Committee of May 9th a progress report outlining in detail four methods of determining the distortion factor of the voltage wave of alternators. The methods described are as follows: (A) Method of Boucherot using an alternator with a sinusoidal wave and a voltmeter. (B) Method of Belfils using a bridge to suppress the fundamental and a voltmeter to read the residue. (C) From the Oscillogram. (D) By means of a harmonic analyzer. The Instruments and Measurements Committee is gathering further data on this subject, which it is hoped will show which of the various methods is preferable.