Mini-Seis III Pro™ Operating Manual
Page 24
Acoustic Trigger
This is the trigger threshold at which the unit will trigger from an air overpressure, or a
noise level in the case of A weighting. To set the value, highlight the field and use the left or
right arrow key. Holding the keys down will change the value at a faster rate. The minimum
linear acoustic trigger setting is approximately 88 dBL (0.5 Pa) based on a 148 dBL range.
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RIGGER
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EVEL
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ONSIDERATIONS
There is no one best setting for the trigger thresholds. Ideally, the thresholds will be set low
enough to trigger to the event, while being high enough to prevent significant false
triggering. The ISEE Field Practice Guidelines for Blasting Seismographs 2017 Edition
suggests 1.3 mm/s (0.05 in/s) seismic and 20 Pa (0.20 millibars or 120 dB). This document is
available at