Casella-cel CEL-440 Manual de usuario descargar pdf (Pagina 8)

The broadband screen in Figure 1 shows one principal and four

subordinate parameters, where the principal parameter is a level as

identified below.

The following frequency weightings may be shown:

A-, C- and Z- (Linear) weighted, where Linear (Z) weighting 20 Hz

to 20 kHz meets the tolerances of IEC 60651.

The following time weightings and other identities may be shown.

S Slow.

F Fast.

I Impulse.

pk Peak.

mx Maximum.

mn Minimum.

eq Equivalent continuous level.

AV Average level.

Tm3 Taktmaximal 3 sek.

Tm5 Taktmaximal 5 sek.

EP,v L

based noise dose normalised to a user

specified period of hours and minutes.

When the period is specified as 8 hours, this

measurement unit will be shown as EP,d.

TWAv Time Weighted Average is the normalised time

averaged sound pressure level with the selected

frequency and time weighting that represents

the total average of a persons workplace noise

exposure averaged over a user specified period

of hours and minutes.

This unit of measurement is specified in the

USA: OSHA standard 1910-95 published in 1983.

When the period is specified as 8 hours, this

measurement unit will be shown as TWA.

N Percentile sound level.

AE Sound exposure level.

Level

980018

Frequency Weighting

Time Weighting

Introduction

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Casella-cel CEL-440 Manual de usuario Pagina 8