Casella CEL CEL-368 - Manual (Page 28)

4. DESCRIPTION
4.1 Store Allocation
Both CEL-268 and CEL-368 have a non-volatile data memory to keep
results safe even while the instrument is switched OFF. The memory is
divided into four independent data stores (1
4). When required, any
store may use all of the available storage space up to the full 60 000
value instrument capacity.
All results collected during a logging run are saved in the first available
free store which will then be flagged "occupied" irrespective of the run
duration. Four complete and separate sets of measurements can be
stored in this way without risk of overwriting existing data.
No further logging will be permitted until the contents of at least one
store have been deleted to make room.
4.2 Operating Modes
Both instruments are capable of operating in three substantially inde-
pendent measurement modes at the same time with results obtained
from each mode being saved in a separate location in the current store.
The instruments ALWAYS operate in both cumulative and period
modes at the same time (even though when the period is set longer
than the cumulative run time, period results are never actually ob-
tained). Simultaneously, results may also be obtained from event mode.
Cumulative:
In cumulative mode measurements are calculated for the whole duration
of the logging run (=cumulative period). This allows results to be deter-
mined for periods with non-standard lengths; for example data can be
collected for periods shorter or longer than the intervals which can be
set for period mode.
Page 24 - CEL-268/368 Operator's Handbook