PCB Test & Measurement Seite 47

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For Additional Specification Information Visit www pcb com PCB PIEZOTRONICS INC 716 684 0001 Fax 716 685 3886 45 Applications Noise Vibration and Harshness NVH Testing Environmental Noise Analysis Sound Power Testing Transfer Path Analysis Sound Pressure Mapping General Noise Reduction The identification of noise sources is necessary to evaluate and reduce noise levels Noise denotes unwanted sound and hence the need to negate these sounds and vibrations Vibrations above and below a specific range may not be detectable to the human ear but may still require treatments for improved product performance and longevity The frequency of the noise is paramount as it dictates which method of treatment or what material will work best As alternatives to intensity measurements acoustic array techniques are currently being evaluated Often when a method is found to provide useful information for one test object in one environment an attempt is made to apply it in situations where it is not necessarily advantageous Unfortunately there does not appear to be a single method of source identification that is easy quick and accurate for all applications This is why PCB offers a variety of acoustic measurement products including condenser modern prepolarized traditional externally polarized array probe low profile surface and special purpose microphones PCB Microphone products are complemented by an assortment of preamplifiers signal conditioners A weighting filters handheld calibrators and accessories Model 377B02 Shown with Preamplifier Accessory Microphones Preamplifiers 3 T Mcatalog 2011 Seite 33 48 A4 F G500 21 04 11 09 27 Seite 45