Casella-cel CEL-440 Manuel d'utilisateur télécharger pdf (Page 14)

Time: F (fast), S (slow), I (impulse),

Q: 3, 4, 5, 6 energy conversion factor.

Broadband models can measure all of the following parameters

simul-taneously.

Sound level, with current weightings (A and F

are shown),

Maximum level, with current weightings,

Minimum level, with current weightings,

Equivalent continuous level, with current

frequency weighting,

Equivalent continuous level, with impulse

weighting,

Linear peak,

Sound exposure level (sometimes known as SEL),

Noise dose normalised to a user selected

(variable) period of hours and minutes,

When the period is set to 8 hours, this will be

shown as L

Cumulative average of fast weighted maximum

values taken over 3 s periods (Taktmaximal 3),

Cumulative average of fast weighted maximum

values taken over 5 s periods (Taktmaximal 5),

Five percentile values using current weightings

with values between 0.0% and 99.9% that can

be set by the user,

TWA

Time Weighted Average is the normalised time

averaged sound pressure level with the selected

frequency and time weighting that represents

the total L

of a person’s workplace noise

exposure averaged over a user selected

(variable) period of hours and minutes.

This unit is specified in the USA: OSHA standard

1910-95 published in 1983. When the period is

set to 8 hours, the unit will be shown as TWA.

Average level over the measurement period.

Narrow band models can measure and scan the following parameters

simultaneously.

Introduction

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Casella-cel CEL-440 Manuel d'utilisateur Page 14