Larson Davis SoundAdvisor 831C Reference Manual page 167

Slow L
ASmax
Minimum
Fast L
AFmin
Minimum
Fast L
AFmax
Maximum
Impulse L
AImin
Minimum
Impulse L
AImax
Maximum
Peak L
Apeak(max)
1. Linear integration method selected by user
2. Exponential Integration method selected by user
Occurrence Time for Minimum and Maximum
Levels
Time
A
Weighting
Slow T
ASmin
Maximum
Slow T
ASmax
Minimum
Fast T
AFmin
Minimum
Fast T
AFmax
Maximum
Impulse T
AImin
Minimum
Impulse T
AImax
Maximum
Peak T
Apeak(max)
Percentile Levels, percentages n1 through n6
selectable, 0.01 to 99.99%
Statistics are sampled every 10ms from the
selected frequency and time weighted detector.
1
2
3
4
5
6
SoundAdvisor Model 831C
L L
CSmax ZSmax
L L
CFmin ZFmin
L L
CFmax ZFmax
L L
CImin ZImin
L L
CImax ZImax
L L
Cpeak(max) Zpeak(max)
C Z
T T
CSmin ZSmin
T T
CSmax ZSmax
T T
CFmin ZFmin
T T
CFmax ZFmax
T T
CImin ZImin
T T
CImax ZImax
T T
Cpeak(max) Zpeak(max)
Units
L dB
ωƬn1
L dB
ωƬn2
L dB
ωƬn3
L dB
ωƬn4
L dB
ωƬn5
L dB
ωƬn6
Exceedance Metrics, exceedance levels (L1, L2, P1,
dB
P2 and P3) selectable in dB from 0.0 to 200.0,
counts each time the level rises above the
dB
threshold and measure the duration while above
the level minus 2dB.
dB
dB
SPL 1
SPL 2
dB
Peak 1
dB
Peak 2
Peak 3
Overload count and duration metrics
• Occurrences, count from 0 to 99999: nnnnn
• Overload Percentage: nnn.nn %
Units
• Duration Overloaded: h:m:s.s
• Elapsed Run-Time: h:m:s.s
y/m/d
• Elapsed Pause-Time: h:m:s.s
h:m:s
Community Noise
y/m/d
• Day Night Level, midnight to midnight
h:m:s
•
• Daytime portion of Day Night Level
y/m/d
•
h:m:s
• Nighttime portion of Day Night Level
y/m/d
•
h:m:s
• Day Evening Night Level, midnight to
y/m/d
midnight
h:m:s
•
• Daytime portion of Day Night Level
y/m/d
h:m:s
•
• Evening-time portion of Day Night Level
y/m/d
•
h:m:s
• Nighttime portion of Day Night Level
•
C minus A
mathematical subtraction of C and A weighted
equivalent levels
Linear
L
Aeq
Impulsivity
Mathematical subtraction of impulse and linear
equivalent levels
Linear
L
AIeq
Label Count
L 0 to 99999
ωƬ > L1
L 0 to 99999
ωƬ > L2
L 0 to 99999
ωƬ > P1
L 0 to 99999
ωƬ > P2
L 0 to 99999
ωƬ > P3
LDN
Lday (T - T )
day night
LNight (T - T
night day)
LDEN
LDay (T - T )
day eve
LEve (T - T )
eve night
LNight (T - T
night day
Exponential
- L L - L
aeq AƬeq aƬeq
Exponential
- L
Aeq
Duration
h:m:s.s
h:m:s.s
h:m:s.s
h:m:s.s
h:m:s.s
)
Units
dB
Units
dB
A-7