Building Acoustics

Class 1 Sound Level Meter. This versatile instrument puts the combined features of a precision Class 1 sound level meter, environmental noise analyzer, personal noise dosimeter, and a real-time frequency analyzer in the palm of your hand. Larson Davis Model 831C offers tools to measure reverberation time according to interrupted noise or impulse excitation method, ensures measurement reliability with ensemble averaging, and reports measurement quality indicators and measurement grading.
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The BAS001 Source is designed to generate omnidirectional sound fields for making standard compliant measurements including: reverberation time (ISO 3382, ASTM E2235), building acoustics (insertion loss, acoustic absorption area, etc: ISO 140-4 ISO 140-3, ASTM E336, ASTM E90, DIN 55 210). The BAS001 is typically used to saturate a room with a uniform acoustic field. The available high-efficiency power amplifier has no fan for cooling, allowing measurements in quiet environments, like those in reverberation time applications.
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The BAS003 Source is designed to generate homogeneous sound fields using random noise in compliance with the following standards: Building acoustics (insertion loss, acoustic absorption area, etc: ISO 140-3, ASTM E90, ISO 140-5, ASTM E966). The BAS003 is typically used to generate a noise in a free-field for the evaluation of the transmission loss index of a façade. The available high-efficiency power amplifier, BAS002, is light and can be remotely controlled for easy use in the field. 
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Measurement of reverberation time, sound isolation, and absorption coefficient are generally important measurements when verifying that a space or material complies with design goals. When making these measurements in the field or laboratory it is important to have equipment that is dependable, portable and easy to set up and use. When coupled with the BAS001 omnidirectional speaker or BAS003 directional speaker, the BAS002 amplifier is the ideal sound source for making room and building acoustics measurements.
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The BAS004 is used to simulate foot fall noise in a manner that is well controlled and reproducible so that measured results can be replicated and compared with other measurements. Unique to the BAS004 is an innovative method for raising the five “hammers” using an electromagnetic field rather than the traditional motor, gears and cam. This eliminates unwanted vibration and maintenance associated with a motor, gears and cam while producing better measurements with a virtually maintenance free product.
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The BAS006 is an innovative device used to create impulsive noise that includes low frequency energy and avoids problems like secondary bounce. These characteristics make it a great choice for quickly measuring reverberation time when the complexity and weight of a speaker and amplifier is not needed. Use the BAS006 with a Larson Davis sound level meter to automatically detect the impulse and perform the ensemble averaging so you can measure decay times quickly with full results right on the meter.
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DNA was developed to integrate and fully support all types of measurements made with Larson Davis noise and vibration instrumentation. It replaces the need for several different software applications to achieve what you really want for display, analysis, and reporting of all project measurement data. DNA quickly produces high quality charts, reports, and presentations.
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