CASELLA CEL CEL-490 Manual do Utilizador descarregar pdf (Página 47)

CEL-63x Environmental Noise Meter

47 Casella CEL

Octave time constant

The setting options are for F (Fast) or S (Slow) octave time constant.

This setting defines the time weighting used to display octave or ⅓-octave band

results, and how quickly the CEL-63x instrument responds to changes in sound

pressure level.

Most measurements are made using the Fast octave time constant. When using

this setting, the instrument applies a ⅛-second (125 ms) time constant to the

sound pressure level.

Fast measurements are identified by using the subscript „F‟, for example L

shows the sound pressure level using A weighting and the Fast octave time

constant.

When you set the instrument to use the Slow octave time constant, it applies a

1-second time constant to the sound pressure level.

Slow measurements are identified by using the subscript „S‟, for example L

Measurement functions

You can select up to nine measurement functions for each user-defined

measurement view. The bottom of the screen has a counter to show how many

functions you have selected, for example “7/9”.

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CASELLA CEL CEL-490 Manual do Utilizador Página 47