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Sound level meters respond to fluctuations in air pressure caused by sound waves and are sometime referred to as Sound Pressure Level (SPL) Meters. ATP Stocks a selection of sound level indicators, high-performance meters that conform to IEC 61672-1:2013 Class 1 and Class 2, and Dosemeters. Whether you need a simple indicator or a high-spec meter we aim to source the most cost-effective solutions available on the market. Learn more
Time Weightings | |
---|---|
A standardised delay in recording changes to sound level | |
Slow | A slower response time to changes in sound. - 1 second |
Fast | A fast response time to changes in sound - 125ms |
Impulse | A quick response time designed to measure bursts of sound |
Frequency Weightings | |
A change to the emphasis to certain frequencies to reflect different perceptions of sound. | |
'A' Weighting | Standard weighting of audible frequencies designed to reflect the response of the human ear. |
'C' Weighting | Standard weighting used for Peak sound pressure measurements |
'Z' Weighting | A flat frequency response of 8Hz to 20kHz ±1.5dB |
Note: Time weightings and Frequency weightings are often indicated as part of the measurement parameter. Leq would be respresented as LAeq or LCeq with the A or C representing the Frequency weighting. LCFmax represents the maximum sound level at the C Frequency weighting and Fast Time weighting, LASMax would respresent maximum sound level at the A Frequency weighting and Slow Time Weighting.
Term | Description |
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db(A) or dBA | Decibels 'A' Weighted |
db(C) or dBC | Decibels 'C' Weighted |
db(Z) or dBZ | Decibels 'Z' Weighted |
Lp | Sound Presure Level |
Leq | Equivalent Continuous Sound Level |
Lmax | Maximum Sound Level |
Lmin | Minimum Sound Level |
Peak | Highest peak of the pressure wave with no time constant applied - Not to be confused with Lmax |
LEp'd | Daily Personal noise Exposure |
LEp'w | Weekly personal noise exposure' |
LE | Leq normalised to 1 second |