Casella CEL CEL-281 - Manual (Page 88)

4. If the instrument is already fully operational but the display has
been switched OFF, press the key to switch the display
ON, then go to step 8.
5. If the instrument has already been switched ON, the display
is ON, but no data is currently being logged (RUN legend not
shown), or the instrument has been stopped, go to step 8.
6. If the instrument is fully operational while the RUN legend is
displayed continuously to indicate that data is being logged, go
to step 7, but note the Caution.
Caution
When the instrument is restarted with the
key after data logging has been stopped, the
memory contents are cleared and all
previously stored data lost. To preserve the
data, download to a PC before restarting.
7. When the instrument is logging data (with RUN legend dis-
played continuously), press the + keys simultane-
ously to stop logging.
8. Press + keys simultaneously to enter calibration
mode and if required, either perform an acoustic calibration fol-
lowing the instructions given in Section 4.5, or press the
key once to leave calibration mode.
At the end of the calibration procedure, the instrument becomes
fully operational in L
AVG measurement mode with the LAVG leg-
end displayed, and one of the (data), (Fast), (Slow) or
Preparation
CEL-281 Operator's Handbook - Page 79