Larson Davis SoundAdvisor 831C Reference Manual page 164

FIGURE A-5 Self-generated noise levels for 1/3 octave filters with direct input
50.0
40.0
30.0
20.0
10.0
0.0
-10.0
-20.0
-30.0
1
OBA Measurement System
Integration Method: Follows setting for SLM
Frequency Weightings: Independent of setting for
SLM, selected frequency weighting (A, C or Z) indicated
by 
Time Weightings/Detectors: Follows setting for SLM,
time weighting (S, F or I) indicated by 
OBA Measurements
Instantaneous "Live" Metrics: For display and profile
graph, not stored with measurement.
OBA Live Equivalent
Level Spectrum, 1s
Overall Metrics:
OBA Overall Equivalent
Level Spectrum
OBA Overall Maximum
Level Spectrum
OBA Overall Minimum
Level Spectrum
Percentile Spectrum Levels, uses same percentages
n1 through n6 selected in SLM, 0.01 to 99.99%
SoundAdvisor Model 831C
Direct 1/3 OBA Noise Floor
10
Linear Exponent Units
L L dB
ωeq(f) ωƬeq(f)
Linear Exponential
L L
ωeq(f) ωƬeq(f)
L L
ωmax(f) ωƬmax(f)
L L
Ƭmin(f) ωƬmin(f)
100 1000
Statistics are sampled every 100ms from the selected
OBA frequency weighting and time weighting into 0.1
dB wide amplitude classes
Units
dB
dB
dB
High +0dB
High +20dB
Normal +0dB
Normal +20dB
10000
Units
1 L dB
ωƬn1(f)
2 L dB
ωƬn2(f)
3 L dB
ωƬn3(f)
4 L dB
ωƬn4(f)
5 L dB
ωƬn5(f)
6 L dB
ωƬn6(f)
A-18