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Pattern Approval Tests of Sound Level Meters: The Influence of Mechanical Vibrations on their Performance

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Mechanical vibrations of a base which, during measurement, affect the sound level meter (SLM) via a tripod can have a considerable influence on the measuring value displayed. Especially vibrations along the main measuring direction of the microphone (reference direction) cause a mechanical stimulation of the microphone and a considerable reduction of the linear measuring range. To check the vibrational sensitivity, an automatic measuring assembly has been set up in which two sound level meters are exposed simultaneously to a sound field of constant frequency. The displayed A-weighted values of both meters are compared with each other while one of the two meters is stimulated by an electro-dynamic shaker to vibrate at a band limited acceleration of 1 m/s2. The stimulation is applied in two directions: (1) in the reference direction of the microphone and (2) turned 90° in the direction perpendicular to the reference direction. The frequency of the stimulation varies between 31.5 Hz and 1 kHz. The result of the measurement shows that the lower limit of linearity under the specified conditions of mechanical vibration may be shifted to a level of up to more than 75 dB(A).
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Document Type: Research Article

Publication date: March 1, 2011

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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