Larson Davis 831, User Manual

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Model 831 Manual Setup Tabs 4-11
Delta
The Delta level is the maximum allowed change in Current
average level (i.e. L
Aeq
) permitted during the time interval
defined below. The minimum level that can be set is 0 and
the maximum is 5.0 dB. The default is 0.2 dB.
Time
The Time is the minimum interval that the measurement
must run. The measurement will run for the interval
specified and then continue until the stability condition is
met. The smallest value that can be entered is 20 seconds
and the largest is 99:59:59 (h:m:s), The default is 20
seconds.
Triggers Tab
Note that the default values for these
parameters are as shown in
FIGURE 4-10.
FIGURE 4-10 Triggers Tab
The Triggers tab is used to define trigger levels associated
with exceedance events; instances where the measured
sound level (SPL or Peak) exceeds one of the user-defined
trigger levels. The variation of sound level during a typical