Press "3", Averaging period. The averaging period is user selectable over the range
from 1 minute to 60 minutes. The stored data will be the average of the data measured
at five-second intervals over the user selected averaging period. If the averaging period
is less than the logging interval, the average logged will be for a period of time at the
end of the logging interval equal to the averaging period. If the averaging period is
longer than the logging interval then the data stored will be a running average that
reaches back into previous logging intervals. The averaging period is usually set to 15
minutes or the same as the logging interval.