Download VLF Receiver Manual

about the choice of Filter (PassThrough
used here).
Now view the data on the Chart, or the
RawData and ProcessedData tabs.
Do not turn off the Controller until you are
Exporter.exportRawData(filename,
timestamp, dataformat)
Save the RawData to a specified filename, in
sure that the data are saved on the
computer.
the format of your choice (initially Stardata
XML).
Exporter.exportChart(filename,
timestamp, format, width, height)
(Optional) Save the chart as an image, in the
format of your choice (e.g. PNG works well).
Remember that you cannot reload the data
from a chart, only from the RawData file.
Take some time to become familiar with the capturing and downloading process, and then
experiment with processing and storage options. For instance, the ProcessedData tab shows
the effect of filtering the RawData. The optional filter is enabled during the getData()
download. The first release of the software includes a SimpleIntegrator, a filter which just
averages a number of data samples over a period specified by the configuration property
DAO.TimeConstant. In hardware terms, the effect is the same as applying an RC low pass
filter to the voltage output. You may export the ProcessedData independently of the
RawData. The chart shows the ProcessedData, so if you do not want to filter your data,
remember to set the filter parameter to PassThrough.
Realtime Logging Mode
This mode is run with a single command, as below.
Core.reset()
DataCapture.captureRealtime(sampleinterval,
captureperiod, filter, update, logging)
All logging parameters are entered
View the samples on the Chart or the data tabs, as
they are accumulated.
In order to save memory, the data
in the single command.
are ‘decimated’ when there are too
many to fit precisely on the graph.
This does not affect the underlying
RawData, it is purely to improve
display efficiency.
Exporter.exportRawData(filename, timestamp,
format)
Export your data to a file on your
computer.
Allow the capture to run to completion after the
specified captureperiod, or use Abort.
The remarks under capture() concerning RawData and ProcessedData also apply to
captureRealtime().
Issue 1 2010 January
38
© UKRAA