PART 1
English
9
The four sound level parameters are:
• L
AF
: The ‘A’ frequency-weighted and ‘F’ time-weighted sound pressure level. This parameter
is always displayed when the instrument is switched on, even if you have not started a meas-
urement. It is an instantaneous value, which is mainly used to determine the approximate
sound levels in order to select the appropriate sound level range to measure.
Fig.2.1
L
AF
parameter displayed
• L
Aeq
: The equivalent continuous, ‘A’ frequency-weighted sound pressure level. L
Aeq
is a lin-
ear average of all the varying sound pressure levels detected during a measurement. For a
number of international and national standards, it is the key parameter in determining annoy-
ance from environmental noise and assessing the risk of hearing deficiencies induced by expo-
sure to high sound levels at the work place. Note: L
Aeq
is not time-weighted.
Fig.2.2
L
Aeq
parameter displayed
• L
AFmax
: The maximum ‘A’ frequency-weighted and ‘F’ time-weighted sound pressure level
detected during a measurement. It is the maximum value of L
AF
detected during a measure-
ment. It is often used in comparison with another parameter (for example: L
Aeq
) to ensure a
single noise event does not exceed a limit.
Fig.2.3
L
AFmax
parameter
displayed
• L
Cpeak
: The maximum ‘C’ frequency-weighted, peak sound pressure level detected during a
measurement. L
Cpeak
is used to assess risks of hearing deficiencies induced by very high
sound pressures of short durations at work places. Remember that peak levels can be very high
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