IT Equipment noise emission standards: overview of new development in the next edition of ISO/ECMA standards

摘要

Over the last few years, the IT equipment industry added a few new product categories and the complexity of product noise emission signature also grew with the advances in information processing. Those changes led to new developments to be introduced in the 10th edition of ECMA-74 (target December, 2008) and will also directly impact ISO 7779 and ANSI S12.10 Annex C. This paper outlines some of those new developments, including 1) new operating modes for computing devices in Annex C15 and C18 to better represent the noise emission level variation with microprocessor, memory and graphic usage; 2) handheld devices, such as mobile internet devices and media players; and 3) refinement in the prominent tone determination methodology of Annex D that impacts many categories of IT equipment, such as hard disk drives, computer fans and blowers. The paper provides the background information behind each new development and gives technical details on the changes in order to prepare industry to adopt the new tests.