Larson Davis SoundAdvisor 831C Reference Manual page 199

Bin Max
Community Noise Equivalent Level (CNEL, L
Criterion Duration (Tc)
Criterion Sound Exposure (CSE)
Criterion Sound Level (L
SoundAdvisor Model 831C
Bin Max is one of 2 choices for the Max Spec setting on the OBA Page of the Setup Manager. See
also "At Lmax"
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.
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

1

----- -
L = 10log
den 10
24

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.
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
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 "Exchange
Rate (Q), Exchange Rate Factor (q), Exposure Factor (k)".
Standard: ANSI S1.25
)
c
It is the sound level which if continually applied for the Criterion Duration will produce a Noise
Dose of 100%. The current OSHA Criterion Level is 90 dB.
Standard: ANSI S12.19
 T 2

 
1
-- -
L avg = qLog 10 10

T


T 1
)
den
0700 1900
 
  10  
L + 10 L
i i
10 + 10
0000 0700
CSE = T c 10


 L p t    q 

dt



2200 2400
 
  10 
10 L + 5
i
+ 10 + 10
1900 2200
L c q 

  10 
L + 10

i

C-2