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The parameter Leq with applied ‘A’ weighting is essential for Noise at Work
assessments and many other applications.
An example screen display may be: -
Maximum Sound Pressure Level
This is maximum sound pressure level in decibels measured over the recording
period.
This parameter is an rms value and is not to be confused with the Peak which
may be much higher.
As with Sound Pressure Level it is Time and Frequency weighted.
An example screen display may be: -
Peak Level
This is the frequency weighted crest (Peak) of the sound pressure level and
should not be confused with the rms maximum sound pressure level.
Peak is also used for many other applications, and these should be checked to
determine which weighting should be applied.
In the UK the Peak parameter with applied ‘C’ weighting is essential for Noise at
Work assessments. The Control of Noise at Work Regulations 2005 stipulates
the following Peak action and limit values: -
130dBC = Lower Action Value
135dBC = Upper Action Value
137dBC = Limit Value
An example screen display may be: -
LAq 74.1
Frequency Weighting
Amx 81.6
Frequency Weighting
Cpk 96.7
Frequency Weighting
