Larson Davis 831 - Exiting Settings Screen

Model 831 Manual Exiting Settings Screen 4-15
and/or the night accordingly and also to choose the time for
the start of the day.
To accommodate these and other possible modifications, the
Day/Night tab permits the user to modify the times for the
beginning of the Day, Evening and Night periods and the
penalties to be utilized when calculating 24-hour integrated
values.
CNEL
In the state of California, a commonly used community
noise descriptor is Community Noise Equivalent Level
(CNEL), defined by the following formula:
This is essentially the same as the L
DEN
using default
values, with the exception that the evening period begins at
22.00 instead of 23.00. Thus, by making this change in the
L
DEN
settings, the measured value will represent CNEL.
Exiting Settings Screen
To exit the Settings Screen, press the Center Softkey labeled
Close.
If any setup parameters have been changed, the “Apply
Changes” message box will be displayed as shown in
FIGURE 4-13.
FIGURE 4-13 Apply Changes
CNEL 10log
10
1
24
------
10
L
i
10+10
0000
0700

10
L
i
10
0700
1900

10
L
i
5+10
1900
2200

10
L
i
10+10
2200
2400

++ +



=