Abstract
Many manufacturers of products and equipment use ISO 3744 to measure and report their sound power levels. (ISO 3744 is nationally adopted as an American standard—ANSI/ASA S12.54.) The products include almost all sources that are primarily stationary such as household appliances, computers, heavy machinery, and construction equipment. The standard is referenced in European regulations and hundreds of machine-specific standards. Many users of ISO 3744 have complained that it was too complicated, complex, and difficult to use. In response to these user concerns, the ISO working group responsible (ISO TC43/SC1/WG28) is revising ISO 3744 to make it simpler to use and less complex. Among the many changes, the draft standard includes the following: removing rarely used conditions and reducing the complexity of background noise calculations. The revision also removes certain aspects and places them into two new standards also under development: (1) qualification of measurement rooms ISO 26102-1 and (2) measurement uncertainty ISO 5114-1. Draft standards are being balloted in member countries of ISO TC43/SC1 (Noise). This paper will describe the provisions in the draft revision of each of these three noise standards and their current status.
Published Version
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