9/12/00 Overview 2-3
The 824 also provides an automatic measurement and log-
ging feature which provides the sound level parameters L
eq
,
SEL, L
max
, L
min
, L
Peak
and the L
eq
and Max or Min spectra
data at regular user-defined time intervals. Due to the com-
plex digtal processing necessary to perform simultaneous
sound level measurements and spectrum analysis, the mea-
surement range in this mode is reduced to 80 dBA.
The design of the System 824 permits the simultaneous mea-
surement of the following sound level parameters, a feature
we call “Any Data”:
Peak Sound Pressure Level (L
peak
)
with A, C and Flat
weighting.
Equivalent Continuous Sound Pressure Level (L
eq
)
with
A, C and Flat weighting. A time history record can be
enabled to capture samples at periods as short as 1/8th of a
second.
Spectral Analysis with Time History Record
allows you
to record spectral data along with the 33 sound level param-
eters mentioned above.
An interval history which includes
6 L
n
values
(6 values
with 0.1 dB resolution, based on user-selected percentages
with 0.01% resolution).
Leq Peak
Live SPL Lmax Lmin
Detectors Detectors Dectectors
Slow Fast Impl Slow Fast Impl Slow Fast Impl
A
'''''''''''
C
'''''''''''
Flat
'''''''''''
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