MEASUREMENT AND OPERATION
Meter functionality covered in this section is the same for all models.
NOTE: Although the meter screen goes to sleep after three minutes of inactivity, the meter is always on in the
background taking measurements. To turn off the meter completely, remove the batteries (see page 12).
Every 3 minutes, the DLI meter will automatically make 10 measurements over a 4-second period. These
measurements are averaged together and saved to internal memory as a single value, representative of the 3-
minute period. When 24 hours of data have been accumulated, a daily total (Daily Light Integral) is determined and
saved to internal memory.
Photoperiod is the accumulated number of hours (in a 24-hour period) in which the averaged measurement was
over 0.1 µmol m
-2
s
-1
. Every 6 minutes of light will increase the displayed photoperiod total by 0.1 hours. Since
measurements are taken every 3 minutes, it is possible that the DLI meter can miss intermittent lighting events
shorter than 3 minutes.
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