LxT Manual
Measurement Settings Tabs
4-17
• Day: 07.00 to 19.00
• Evening: 19.00 to 23.00
• Night: 23.00 to 07.00
Lday, Levening and Lnight are A-weighted long-term
average sound levels measured during the day, evening and
night, respectively.
To account for the increased impact of environmental noise
during the evening and night, penalties are added to the
measured level; 5 dB for evening and 10 dB for night, as can
be seen in the equation.
The Directive 2002/49/EC of the European Parliament and
of the Council of 25 June 2002, relating to the assessment of
environmental noise permits member states to shorten the
evening period by one or two hours and lengthen the day
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 represents CNEL.
CNEL
10log10
1
24
------
10
Li
10
+
10
0000
0700
10
Li
10
0700
1900
10
Li
5
+
10
1900
2200
10
Li
10
+
10
2200
2400
+
+
+
=
Summary of Contents for SoundExpert LxT
Page 1: ...LxT Manual for SoundTrack LxT SoundExpert LxT TM...
Page 55: ...4 18 Measurement Settings Tabs LxT Manual...
Page 81: ...5 26 View Spectrum Normalized Optional LxT Manual...
Page 93: ...6 12 Data Storage After Improper Shutdown LxT Manual...
Page 110: ...LxT Manual Certification 7 17...
Page 143: ...11 6 Control Panel Data Explorer LxT Manual...
Page 167: ...12 24 Options LxT Manual...
Page 179: ...14 4 User LxT Manual FIGURE 14 5 shows the User tab FIGURE 14 5 User Tab...
Page 185: ...15 6 File System LxT Manual...
Page 191: ...16 6 Miscellaneous Parameters LxT Manual...
Page 206: ...LxT Manual Technical Specifications A 9 Typical Z Weight Frequency Response...
