Larson Davis SoundAdvisor 831C Reference Manual page 138

Table 17.2 Dynamic Response
Setting Number
1
2
3
4
5
SoundAdvisor Model 831C
About the Background Level
The background sound level used with dynamic triggering is the user-
indicated Ln level (Setup Manager
which includes the rise rate in dB per minute. There are 5 Dynamic Trigger
Parameters options available:
Tracking Ln
Percentile
95%
90%
90%
90%
80%
When the measurement first begins, the background tracking level is set to
the following:
Trigger Level SPL 1 – Offset = Initial Background Level
As the sound level increases above the background tracking level, the
tracking level will increase at the rise rate. As the sound decreases below the
tracking level, the tracking level will decrease at the rate determined by the
dynamic response (Ln Percentile and its rate).
Thus, the dynamic trigger level is set to the following:
Background level + Offset = Trigger Level
Understanding Level and Dynamic Triggering
 Ln Tab), calculated using an algorithm
Rise Rate, dB/
minute
1/2
1/3
1/2
1
1 Fast and higher tracking level
Description
Lower tracking level
Slow
Default, normal operation
Fast
17-11