![]() ![]() No reference impedance is assumed, though 600 ohms is common in audio equipment.ĭB SPL, dB(SPL), dBSPL and dB SPL, variations of sound pressure levelĭBV and dB (1 V RMS), voltage ratio with a reference voltage of Vo = 1.00 volt = 0 dBV, regardless of impedance.ĭBW or decibel watt, is a unit for the measurement of the strength of a signal expressed in decibels relative to one watt. Note 3 : the base of the logarithm is indicated by use of a unit of level associated with that base. Note 2 : the value of the reference quantity remains unchanged, whether the chosen quantity is Peak, the RMS, or otherwise. Note 1 : the kind of level is indicated by use of a compound term such as sound power level or sound pressure level. The base of the logarithm, the reference quantity, and the kind of level must be indicated. If the Leq (equivalent continuous sound level) is measured over 8 hours, then the LAeq, the LEP,d and the LEX,8h will all be the same.ĭB Level the logarithm of the ratio of a given acoustic quantity to a reference quantity of the same kind. Alternatively noise dose meters may be used to check the levels bearing in mind these are usually Class 2 devices Measurements should be made with a precision Leq sound level meter equipped with a Cpeak network. The Lower Exposure Action Levels = 80 dBA and a The UK Noise Regulations require action if the following Noise Exposure Action Levels are exceeded If the noise exposure of workers varies markedly from day to day, the personal noise exposure may also be assessed over a week rather than a day. Daily Noise Exposure (LEX,8h) is the time-average, A-weighted noise level for a nominal 8-hour working day, also known as LEP,d.ĭaily Personal Noise Exposure (LEP,d) is the time-averaged, A-weighted noise level for a nominal 8-hour working day, also known as LEX,8h, used for assessing the noise exposure of a worker during a working day. ![]()
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