Abstract :
AT A CONFERENCE on sound and vibration measurement held during the 1938 AIEE winter convention, A. P. Fugill (A´24, M´30), The Detroit Edison Company, Detroit, Mich., described a series of investigations of noise measurement conducted by that company. The company now has issued a specification describing standard methods of power-transformer noise measurement; the instructions are based upon American Standards Association tentative standards Z24.1 (Acoustical Terminology, 1936), Z24.2 (Noise Measurement, 1936), Z24.3 (Sound Level Meters, 1936), and the proposed AIEE Test Code for Apparatus Noise Measurement, which was issued in 1937. Transformer purchase specifications of the company now include a specification of tolerable noise level, and the company´s specification is used as a basis for testing the units after delivery.
