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About Parameters
Time-averaged Levels
The instrument can average levels of the sound source over time.
l
Leq = equivalent continuous sound level
This parameter calculates a constant level of noise with the same energy content as the varying acoustic noise sig-
nal being measured.
l
LE = sound exposure level
This parameter takes the sound levels for a period of time and calculates the constant sound level that would pro-
duce the same total sound energy in one second. Sound level exposure is sometimes called single event level
(SEL).
Peak Levels
l
Lpeak = peak sound level
This parameter gives the highest value of the frequency-weighted acoustic signal.
Exponential-averaged Levels
The exponential averaged sound levels provide easy-to-read values. A number of parameters are derived from the
exponential averaging:
l
Lmax = maximum sound level
This parameter gives you the highest time-weighted sound level that occurs during the measurement time.
Lmax is often used in conjunction with another noise parameter (for example, Leq) to ensure a single noise
event does not exceed a limit.
l
Lmin =minimum sound level
This parameter gives you the lowest time-weighted sound level that occurs during the measurement time.
l
L = instantaneous sound level
This parameter shows the instantaneous time-weighted sound level as measured by the instrument.
l
L(SPL) = sound pressure level
This parameter calculates the maximum time-weighted sound level during the latest second.
✐ Note: L and L(SPL) are instantaneous values for display only and are not saved with the measurement.
Set up the Instrument: Measurement Parameters
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