About The Normalized Octave Band Page (Overall Page) - Larson Davis SoundAdvisor 831C Reference Manual

Table 4.2 Overall Octave Band Colors

4.2.5 About the Normalized Octave Band Page (Overall Page)

FIGURE 4-13 Overall Tab: Normalized Octave Bands
1.
2.
SoundAdvisor Model 831C
"Leq" is the average sound level of the highlighted
frequency band for the duration of the measurement.
L
eq
L is the maximum sound level of the highlighted
max
frequency band. The maximum spectrum is determined by
L
max
the Max Spec setting.
Bin Max: When set to Bin Max, this value is the maximum
value which occurred during the entire measurement for
that frequency band. Since individual frequency bands
may reach their maximum levels at different times, this
spectrum might be one which never occurred at any
instant during the measurement period.
At Max: When set to At Lmax, this value is the
instantaneous spectrum at the moment when the
broadband maximum occurred (such as LSmax).
L is the minimum sound level of the highlighted
min
frequency band for the duration of the measurement. Since
L
min
individual frequency bands may reach their minimum
levels at different times, this spectrum might be one which
never occurred at any instant during the measurement
period.
This feature requires the 831C-OB3 firmware option, and OBA enabled in the
TAKE NOTE
measurement setup file.
The user-defined references are determined at this location: Tools
System PropertiesReference Spectra.
1.
Highlight the bands to change the selected frequency
by using the left and right arrow keys and
2.
5
Press
to Octave labels.
3.
When you change the weighting and reference, reset
Spectra values by selecting Set Reference.
3.
Understanding the Overall Tab
to jump from Ref, Set Reference, and back
3

 
5
.
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