Winston Engineering Case Study 5
Case Study 5 What is the difference between: SPL – Sound Pressure Level (in dBA ) SWL – Sound Power Level (in watt) SPL – Sound Pressure Level (in dBA ) A sound level meter is used for acoustic (sound that travels through air) measurements. It is commonly a hand-held instrument with a microphone . The diaphragm of the microphone responds to changes in air pressure caused by sound waves. That is why the instrument is sometimes referred to as a Sound Pressure Level (SPL) Meter. This movement of the diaphragm, i.e. the sound pressure deviation (pascal Pa), is converted into an electrical signal ( volts V ). SPL – Sound Pressure Level (in dBA ) below is instrument that we are using at test bay SWL – Sound Power Level (in watt) Sound power or acoustic power is the rate at which sound energy is emitted, reflected, transmitted or received, per unit time. The SI unit of sound power is the watt (W). It is the power of the sound force on a surface of the me...