Larson Davis SoundAdvisor 831C Reference Manual page 60

Table 6.1 OBA Overload Levels
Input Gain, dB
FIGURE 6-5 Setup Manager: OBA Tab
FIGURE 6-6
Setup Manager: Ln Percentiles Tab
SoundAdvisor Model 831C
About Using the Gain Feature
When using a microphone with sensitivity of 50 mV/Pa, the input overload
occurs approximately as shown in Table 6.1.
OBA Range
0
20
0
20
About Integration Methods
Although the 831C measures levels at all 3 detector and frequency weighting
settings according to your selection, some features require a single
combination. The level defined by the detector and frequency weighting you
select is used for the computation of Ln, Exceedances, Sound Exposure, and
Sound Events. However, some features may not be available for Exponential
Integration Method. See
Step 5
If OBA is enabled for your meter, use the right (
OBA tab as shown in Figure 6-5.
1.
2.
3.
4.
5.
the Ln Percentiles tab as shown in Figure 6-6.
High
High
Normal
Normal
Appendix C Glossary on page C-1.
1.
Normal or High: For measurement range specifi-
cations, see
Octave Linearity Range," on page A-13
2.
Select 1/1 Octave bandwidth, 1/3 Octave band-
width, or both simultaneously.
3.
Choose a Frequency Weight for the 1/1 Octave
and 1/3 Octave bandwidth frequency analysis.
4.
For more information about Max Spec (Maximum
Specification) values, see "Bin Max" and "At Lmax" in
the
Appendix C Glossary on page C-1.
5.
Spectral Ln values can be measured using 1/1 or
1/3 octave bandwidths. If both 1/1 and 1/3 are
selected in the Bandwidth setting, Spectral Ln only
measures for 1/3 octaves.
Step 6
Use the right (
Creating a Custom Setup File On the Meter
Overload Level, dB peak
143
123
110
90
//*
) softkey to navigate to the
Table A.8, "Octave Band Analysis 1/1
//*
) softkey to navigate to
.
6-4