An SPL Meter is generally handheld, mobile and lightweight, and is manufactured in line with international standards such as IEC 61672. Sound enters the meter through a microphone, and then the meter evaluates the sound values by converting them into electrical information and the measurement values in decibels are displayed. It is measured with a Sound Pressure Level Meter, such as the Pulsar Nova. The unit measure of SPL is decibels (dB). Or, in other words is the ratio of the absolute sound pressure against a reference level of sound in the air. It is equal to 20 x the Log 10 of the ratio of the Root Mean Square (RMS) of sound pressure to the reference of sound pressure (the reference sound pressure in air is 2 x 10-5 N/m2, or 0,00002 Pa). Sound pressure level (SPL) is the pressure level of a sound, measured in decibels (dB). The unit of pressure measurement is pascal (Pa) Note: The term ‘sound pressure’ may be proceeded by other noise measurement terms such as ‘instantaneous’, ‘maximum’, and ‘peak’ (e.g. Sound pressure (p) is the average variation in atmospheric pressure caused by the sound. To understand what SPL is we must first understand what ‘Sound Pressure’ is. This is defined as Sound Pressure Level (SPL) and is quite a complex thing to get to grips with. The sound level (on a basic level – how loud something is) can be perceived differently by different people so we need to have a means to get an objective measurement of sound level expressed in numerical terms.
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