NTi Audio XL2 Sound Level Meter - Manual (Page 230)

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Appendix
Appendix 3: Description Sound Levels
A-Frequency Weighting Filter in accordance with
IEC 61672
Applicable for most common sound pressure level
measurements, compensating for human hearing
perception at lower sound pressure levels.
C-Frequency Weighting Filter in accordance with
IEC 61672
Applicable for very high sound pressure levels,
compensating for human hearing perception at
high sound pressure levels; typically used for mea-
surements of peak values, e.g., LCpeak
Capture
This selection offers the reference curve, which has
been previously stored with Capture in the spec-
trum analyzer of the SLMeter function.
Application example:
Comparing the performance of the left and right •
speakers in a live event sound setup.
Sound Exposure Level
The sound exposure level LAE is the LAeq normal-
ized to 1 second. The sound exposure level is mea-
sured to compare noise events with different time
durations. The LAE reports the amount of noise
from an event such as an individual aircraft fly-over.
LAE = LAeq + 10 x log (time in seconds)
Time-Average Sound Level or
Equivalent Continuous Sound Level in accor-
dance with IEC 61672
Moving Time-Average Sound Level or
Moving Equivalent Continuous Sound Level
with selectable time window from five seconds up
to one hour. Four individual levels can be config-
ured. The moving time-average sound level is an
Leq based on a moving time window.
Sample:
10h 00min 00sec Start of XL2 measurement
10h 00min 05sec Leq5” = Leq of this 5 seconds