Slm - Larson Davis SoundAdvisor 831C Reference Manual

6.2.2 SLM

FIGURE 6-4 Setup Manager: SLM Settings
The weighting for the
measurement can be
made in A (default), C,
or Z.
Detectors affect how
quickly the sound is
being measured. It can
be changed to slow,
fast, or impulse.
SoundAdvisor Model 831C
The integration method has two options:
Linear
This is the default and most used integrating method. Linear integrates
only the energy during a given period of time. It does not show a decay
slope of a fast, slow, or impulse exponential detector.
Exponential
Exponential integration shows a long decay of energy after an impulse,
and it may hide small events or loud impulsive events. This integration
is not commonly used. In addition, if performing time history
measurements of 10 ms or less, linear must be used and not
exponential.
Although the 831C measures levels at all three detector settings and
frequency weighting settings, some features require a single
combination. The level defined by the detector and frequency
weighting selected is used for the computation of Ln, exceedances,
sound exposure, and events.
Setup Manager
The default peak
weighting is Z, but can be
changed to A or C.
20 dB Gain can be
checked when
measuring low level
sounds, or when the
sound level is near
background noise level.
Uncheck to set gain to 0
dB.
6-4