Inst. for Mech. Eng., Natl. Res. Council, Montreal Rd., Ottawa, ON K1A 0R6, Canada
ANSI and IEC working groups have been involved in the development of instrument standards for the measurement of sound intensity. The primary application of these standards is to instruments used for determining sound power of noise sources in accordance with the requirements of approved ANSI and ISO standards. The approach taken by both the working groups in the development of the documents is very similar with only minor variations, notably in the frequency range, specification of pressure residual intensity requirements, and testing devices. Requirements and performance verifications are specified for the complete instrument system comprising probe and processor, and separately for the probe and processor. Performance verification tests are written in terms of type of tests, periodic verification tests, and field checks. The paper will discuss in detail, the scope and purpose of the standard, instrument requirements, and methods for performance verifications.