SoundAdvisor Model 831C
C-2
Bin Max
Bin Max is one of 2 choices for the Max Spec setting on the OBA Page of the Setup Manager. See
also
Bin Max is the maximum value that 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.
Community Noise Equivalent Level (CNEL, L
den
)
A rating of community noise exposure to all sources of sound that differentiates between daytime,
evening and nighttime noise exposure. The equation for it is
The continuous equivalent sound level is generally calculated on an hourly basis and is shown in
the equation as L. The levels for the hourly periods from midnight to 7 a.m. have 10 added to them
to represent less tolerance for noise during sleeping hours. The same occurs from 10 p.m. to mid-
night. The levels for the hourly periods between 7 p.m. and 10 p.m. have 5 added to them to repre-
sent a lessened tolerance for noise during evening activities. They are energy summed and
converted to an average noise exposure rating.
Criterion Duration (Tc)
It is the time required for a constant sound level equal to the Criterion Level to produce a Noise
Dose of 100%. Criterion Duration is typically 8 hours.
Example: If the Criterion Level = 90 dB and the Criterion Duration is 8 hours, then a sound level of
90 dB for 8 hours, will produce a 100% Noise Dose. See Noise Dose. Standard: ANSI S12.19
Criterion Sound Exposure (CSE)
The product of the Criterion Duration and the mean square sound pressure associated with the
Criterion Sound Level when adjusted for the Exchange Rate. It is expressed in Pascals-squared
seconds when the exchange rate is 3 dB, where q is the Exchange Rate Factor. See
Rate (Q), Exchange Rate Factor (q), Exposure Factor (k)"
Standard: ANSI S1.25
L
avg
qLog
10
1
T
---
10
L
p
t
q
T
1
T
2
dt
=
L
den
10log
10
1
24
------
10
L
i
10
+
10
0000
0700
10
L
i
10
0700
1900
10
L
i
5
+
10
1900
2200
10
L
i
10
+
10
2200
2400
+
+
+
=
CSE
T
c
10
L
c
q
=
Summary of Contents for 831C-FFT
Page 1: ...Larson Davis SoundAdvisor Model 831C Sound Level Meter Reference Manual...
Page 214: ...SoundAdvisor Model 831C A 50 FIGURE A 47 Model 831C with 377C20 Microphone...
Page 215: ...SoundAdvisor Model 831C A 51 FIGURE A 48 Model 831C with 377C20 Microphone...
Page 216: ...SoundAdvisor Model 831C A 52 FIGURE A 49 Model 831C with 377C20 Microphone...
Page 223: ...SoundAdvisor Model 831C A 59 A 10 Declaration of Conformity...
