Larson Davis 831, User Manual

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13-6 Trigger Method Model 831 Manual
FIGURE 13-4 Fixed Level Trigger; Lower Level Events Missed
Dynamic Trigger
Using the dynamic trigger method, you can select to track
the L
90
level (background noise) and trigger a noise event
when the measured level exceeds the L
90
level plus an
offset, which in this example we set to 15 dB. This permits
the capture of lower level noise events which occur during
periods of low background noise, as shown in FIGURE 13-
5.
Fixed Trigger Level
Noise Events Captured
Dog Bark Events Not
Captured