Casella CEL CEL-281 User Manual

Page 106

Press the

key to enter the distribution operational area.

If data is being logged, logging will continue uninterrupted, but
the display will change to one of the following.

Either: if the instrument has been switched OFF since the last
time this operational area was inspected, the display will iden-
tify the 69 dB level for the first memory cell in the one minute
L

histogram (also identified on the display), so that a selection

can be made between cumulative percent or probability percent
values.

Or: if the instrument has not been switched OFF since this
area was last inspected, the previous settings are remembered
and when the key is pressed, the instrument displays the same
cell and the same parameter of the last histogram inspected: cu-
mulative or probability, and % or dB.

If necessary, press the

key again to select the same

memory cell of the next stored histogram in the following se-
ries, each of which is fully identified on the display.

1 min. L

AVG

with Q = 3 taken over 1 minute

sampling period,

10 s L

AVG

with Q = 3 taken over 10 second

sampling period,

1 s L

AVG

with Q = 3 taken over 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.

Note:

Data can be displayed for these parameters only when a logging run has

occurred and the store contains data. If the logging run is still in progress, the

displayed is dynamic and may be seen to change to new values.

The time constant used for the LAVG value displayed will be the constant set

at the time the data was stored.

Obtaining Required Results

CEL-281 Operator's Handbook - Page 97