9/29/09 Overview 2-3
coincident with the maximum value of the sound pressure
level during the measurement period.
A back erase function allows the removal of up to the last 30
seconds (in one second steps) of data when a disruptive
noise occurs.
The 824 also provides an automatic measurement and
logging 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
complex digital processing necessary to perform
simultaneous sound level measurements and spectrum
analysis, the measurement range in this mode is reduced to
80 dBA.
The design of the System 824 permits the simultaneous
measurement of the following sound level parameters, a
feature we call “Any Data”:
Note: The detector used to create
Leq is a pure integrating true RMS
detector which integrates the energy
over a specific period of time. It may
be as short as 1/32 second, in a time
history which may be as long as 24
hours. As a result, it does not include
decay artifacts of older instruments
that integrate the output of the
SLOW or FAST detectors.
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
parameters mentioned above.
Leq Peak
Live SPL Lmax Lmin
Detectors Detectors Detectors
Slow Fast Impl Slow Fast Impl Slow Fast Impl
A
99999999999
C
99999999999
Flat
99999999999
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