Set the sampling interval in minutes or seconds. The
sampling interval is how often a measurement is taken
and logging interval is how often the data is saved. The
logged data is the average of the samples. The logging
interval must be evenly divided by the sampling
interval. For example if the logging interval is 5
minutes and the sampling interval is 2 minutes it
causes an error. But a sampling interval of 1 minute is
acceptable.
Before clicking ‘Get Logged Data’ it is important to set
the time of the last logged data point. This is used to
back calculate the timestamps for the remaining data
points. If you just unplugged the sensor and plugged it
into the computer the preloaded day and time should
be sufficient.
Click ‘
Get Logged Data
’ to save the data to your
computer. You will be asked where you want to save
the data.
Click ‘
Erase Data
’ to erase all the save data. This can’t
be undone.
To use additional SQ-420X devices, open additional ApogeeConnect software windows. The device serial
number will display in the lower left hand corner of the corresponding software window. Devices may be
selected by serial number in the tool bar.
When the software is open and logging data from sensor
models SQ-420X and SQ-520, it will calculate daily light
integral (DLI) in moles and Dark Hours in hours each day at
12:00 AM using PAR values collected during the previous
36 hours. The Dark Hours value is calculated using the
“Darkness Threshold” setting. The number of continuously
logged PAR values less than the Darkness Threshold are
counted and multiplied by the logging interval to calculate
the number of Dark Hours. This represents the longest
continuous duration of darkness, not the total duration of
darkness.
