Acoustic Research Ngara User Manual page 49

In the above example a level of 60dB-A must be reached within L
period. This period can only be set to a maximum of 5 minute blocks.
When trigger is set, 30 seconds of internal buffered data is recorded. This buffer can be set to a maximum of
480seconds (8 minutes)
Once the L falls below 60dB-A, Ngara records a further 20 seconds of raw data.
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Figure 11: Percentile Trigger Example
. This percentile is calculated over a 5 minute
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Ngara
User Manual
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