White Mini-Seis III Pro, Руководство по эксплуатации

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Mini-Seis III Pro™ Operating Manual Page 28
Acoustic Trig
This is the trigger threshold at which the unit will trigger from an air overpressure. 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.
T
RIGGER
L
EVEL
C
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 2009 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 www.isee.org.
Status
To manually activate the histogram select the Activate soft key. The soft key text will change
to Inactivt. To end an active histogram select the Inactivt soft key. A histogram cannot be
manually activated if the Timer is set.
Note: Do not turn off power to the instrument while the
histogram is active. Making the histogram inactive allows the
firmware to write the proper summary entries. Failure to do
this may result in a corrupted record.