Dynamic Triggering - Larson Davis SoundAdvisor 831C Reference Manual

FIGURE 17-9 Event History with Level Triggering, events
The bars represent the events (exceedances)
logged during the measurement. At a
minimum of 3 seconds, there are ~150.
100
90
80
70
60
50
40
30
20
10
0
0:00:00 1:56:39 3:53:19

17.7.2 Dynamic Triggering

FIGURE 17-10 Event History with Dynamic Triggering
The Leq is set the same as the
last example, Figure 17-8 Event
History with Level Triggering
100
90
80
70
60
50
40
30
20
10
0
0:00:00 1:56:39 3:53:19
SoundAdvisor Model 831C
5:49:59 7:46:39 9:48:18
Leq Level Trigger
With dynamic triggering, the event tracks the background noise level,
and adjusts the trigger accordingly. The trigger level is adjusted to
equal the background noise plus an offset.
The background level is
tracked throughout the
measurement.
5:49:59 7:46:39 9:48:18
Leq Background tracking level
Triggering Method
11:44:58 13:41:38 15:38:18
Level Event
11:44:58 13:41:38 15:38:18
Dynamic Trigger Level
17:34:58 19:31:38 21:28:18
The trigger level is adjusted
based on the background level
plus an indicated offset. Here
the offset was 20 dB.
17:34:58 19:31:38 21:28:18
23:24:58
23:24:58
17-8