Casella-cel CEL-281 Manual de usuario descargar pdf (Pagina 54)

When the instrument is fully operational and the instrument

has been switched off since the distribution area was last in-

spected, pressed alone, this key cancels any other display

mode that has been selected and identifies the first (less than

70 dB) memory cell of the ten second L

histogram.

This allows the operator to choose whether to display the data

as either cumulative percent or probability percent.

However, if the instrument has not been switched off since the

distribution area was last inspected, the previous settings are

remembered and when the key is pressed, the instrument dis-

plays the same cell and the same parameter of the last histo-

gram inspected: cumulative% or probability%, and % or dB.

Then repeatedly pressing the key cycles the display through

the other stored histograms (starting from the same memory

cell) as follows.

1 min. L

:Lwith Q = 3 taken over a 1 minute

sampling period,

10 s L

:Lwith Q = 3 taken over a 10 second

sampling period,

1sL

:Lwith Q = 3 taken over a 1 second

sampling period,

Sound pressure level with Fast time weighting,

Sound pressure level with Slow time weighting,

Sound pressure level with Impulse time weighting.

It should be remembered that while the instrument is logging

data, all of these will be "dynamic" histograms that may be up-

dated while they are being inspected.

Once within the distribution area, pressing once selects

the upper (CUM%) command on the key and displays cu-

How It Works

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Casella-cel CEL-281 Manual de usuario Pagina 54