Triggers - Larson Davis SoundAdvisor 831C Reference Manual

When combined
TAKE NOTE
with the Measurement History
feature, these modes produce
a sequence of measurements
made and stored at regular
time intervals.

6.2.6 Triggers

FIGURE 6-8 Setup Manager: Trigger Setting Page
SPL Trigger
Levels: When the
measured SPL
(Slow, Fast, or
Impulse) exceed
the trigger level,
the event begins.
The SPL used is
defined by the
current weighting
and detector.
SoundAdvisor Model 831C
Manual Run/Stop
The measurement is initiated and stopped manually.
Timed Stop
The measurement is initiated manually, and will stop automatically
after a user-defined period of time.
Stop When Stable
Set a dB and time for a stability parameter and if detected, the
measurement will stop.
Continuous
Upon booting up the meter, a measurement will automatically run for
user-defined time and will store data at user-defined times. Continuous
mode will resume automatically after 5 minutes into a Pause.
Single Block Timer
One measurement will automatically start and stop at user-defined
times.
Daily Timer
One or more measurements will start and stop at user-defined times, at
daily intervals. This mode is often used to make a work area survey that
follows a worker's daily schedule with breaks accounted for.
Triggers specify the instances where the measured sound level exceeds
a user-defined parameter. Triggers are used for events, exceedances,
and alert emails.
The event is initiated when the sound level rises above the trigger level
and ends when the sound level drops 2 dB below the trigger level. This
hysteresis is to avoid the creation of multiple exceedances when the
sound level is fluctuating about the threshold.
Setup Manager
Peak Trigger Level:
Three levels can be
set independently
from the SPL triggers.
The peak has a fast
response time, these
triggers can identify
impulsive noises
(e.g., gun shots)
which would
normally not be
recorded.
6-7