Acoustic testing

G.R.A.S. Sound & Vibration (G.R.A.S.), a designer and manufacturer of precision acoustic measurement solutions, has announced the North American market introduction of the G.R.A.S. 45CB Acoustic Test Fixture. Offering high-reliability performance over a wide dynamic range, the 45CB is expressly designed to meet a growing industry need for commercially available acoustic test fixtures (ATF) that can help meet or exceed the ANSI/ASA S12.42 standard. The 45CB provides sufficient acoustic damping for objective measurements of both high-level continuous impulsive noise and the attenuation-related insertion loss encountered with active and passive hearing protection devices such as earplugs, earmuffs and safety helmets. The sturdy, high-temperature and humidity resistant construction of the 45CB is ideally suited for outdoor measurement environments, as well as simulated real-life conditions of test sites, vehicle interiors, aircraft and other areas. In addition, Ear Simulators with built-in ¼? pressure microphones ensure a measurement system that can rapidly and correctly account for impulse peaks produced by heavy industrial and agricul­tural equipment and guns. They can therefore be used with any type of test signal or real-life noise source, including environments where use of human test subjects is simply not possible, due to high noise levels or expressed requirements for objective statistical data.
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