Larson Davis SoundTrack LxT, Руководство пользователя

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4-16
Measurement Settings Tabs LxT Manual
FIGURE 4-17 shows the Day/Night tab.
FIGURE 4-17 Day/Evening/Night Definition
L
DN
The day-night level L
DN
defined by the following formula:
L
DEN
The day-evening-night level L
DEN
is defined by the
following formula:
In the default form, the day has twelve hours, the evening
has four hours and the night has eight hours, as can be seen
in the equation. The default times for these periods are as
follows:
Ldn 10 Log
10
1
24
------
10
Li 10 +
 
10

0000
0700

10
Li 10

0700
2200

10
Li 10 +
 
10

2200
2400

+ +
 
 
 
=
DEN
L =






 






 
10
10
10
5
10
10 * 8 10 * 4 10 * 12
24
1
lg 10
Lnight Levening Lday