Casella-cel CEL-281 Manual do Utilizador descarregar pdf (Página 52)

While average noise levels are being displayed, pressing the

key allows the results to be obtained from four different

exchange rate values (Q). The value in current use will be

shown against the Q legend on the display. (Remember that

is the L value calculated with Q = 3.)

While average noise levels are being displayed, pressing the

key selects the next from a series of up to five threshold

levels for use in the calculation. The newly selected threshold

level will be shown on the display. Then pressing the key

again returns to the average noise level that was being in-

spected, but now shows it calculated with the new threshold

level.

All five threshold levels should be available, but if the criterion

level has been set to a value lower than 90 dB, only threshold

levels ≤ the criterion level will be available as described in Sec-

tions 2.2.2 and 2.2.3. Therefore when a threshold level is re-

quired that is higher than those currently available, the criterion

level must be increased even though it has no part in the par-

ticular L

calculation.

While Fast or Slow maxima are being displayed, pressing the

key displays the time at which the maximum level oc-

curred. Pressing again shows the date at which the maxi-

mum occurred. Then pressing the key twice (or once)

returns the display to the previously indicated maximum level.

How It Works

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Casella-cel CEL-281 Manual do Utilizador Página 52