CASELLA CEL CEL-490 Manual de usuario descargar pdf (Pagina 69)

CEL-63x Environmental Noise Meter

69 Casella CEL

ASmax

(also L

AFmax

and L

AImax

)

The maximum A-weighted sound level measured using

slow time weighting (also with Fast and Impulse time

weighting).

Avg

Average sound

level

The average sound level over the measurement period is a

function used in OSHA measurements and is equivalent

to L

Normally this term is used when the exchange rate Q is

some value other than 3, such as for measurements used

for the OSHA Hearing Conservation Amendment with

Q=5.

Example

A Threshold value is used during the calculation of L

Avg

where any levels below the threshold are not included. For

example, assume the threshold level is set to 80 dB and

the exchange rate is 5 dB (Q = 5). If a one hour

measurement were taken in an environment where the

noise levels vary between 50 dB and 70 dB, the sound

level would never exceed the Threshold and the

instrument would record no value for the L

Avg

However, if the sound level exceeds the 80 dB Threshold

for only a few seconds, only these seconds contribute to

the L

Avg

, giving a level of approximately 40 dB, which is

much lower than the actual ambient sound levels in the

measured environment.

Cpk

(also L

Cpk

, L

Zpk

)

The peak C-weighted (also A-weighted or Z-weighted)

sound level.

Peak

The maximum level in dB reached by the sound pressure

at any instant during a measurement period. The CEL-63x

instrument can measure the peak sound pressure using A,

C or Z weighting.

Peak is the true peak of the pressure wave, which you

should not confuse with the highest sound pressure level

(which is called L

max

Slow time

weighting

A standard time weighting applied to measurements.

When using this setting, the instrument applies a 1 second

time constant when calculating sound pressure levels.

Slow measurements are identified by using the subscript

„S‟.

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