
SymphoniePRO User Manual
Rev. 8
[email protected] | Page 31
11 January 2018
The amount of time to fill the SD card will vary according to sensor configuration and logger settings. A factory-
formatted 512 MB card can hold over 10 years of data files for a typical wind resource assessment (WRA)
installation collecting 10-minute statistical data. For example, a meteorological tower outfitted with 7
anemometers, 3 wind vanes, 2 temperature sensors, 1 barometric pressure sensor and 1 relative humidity
sensor, set to collect 10-minute statistics and connect once per day using a remote connection to the user's PC
will transfer around 45 KB per day.
Note - Because a MetLink connection uses very little bandwidth overhead, the transmitted byte usage will closely
follow the data file size.
Turning on the 1 Hz sample data collection will use about 250 KB of data per day per enabled channel, and a 2
GB SD card is strongly recommended.
For example, if 1 Hz sample data were collected for two of the anemometers and one of the vanes, the sample
data size for the same one day period would be 750 KB. Under this scenario, the daily file size would be 795 KB
(45 KB + 750 KB), and a 2 GB SD card can hold over 6 years of data.
If all channels are enabled, and 1 Hz sample data are collected for all channels, the internal memory will be filled
in about 18 hours, and a 2 GB SD card will be filled after approximately 220 days.
Caution
When collecting 1 Hz sample data, the logger will be creating and transferring very large files relative to those
from previous model NRG data loggers. Please be sure to budget for any 1 Hz sample data collection in your
wireless plan.
Note - With 1 Hz sample data enabled, a 2 GB SD card is strongly recommended. The 1 Hz sample data will use
about 250 kB of data per day per enabled channel. If the SD card is removed, the SymphoniePRO logger will
continue to record data to its internal memory. With 6 channels recording sample data in addition to statistical
data, there will be approximately 4 days of internal data storage. Collecting 1 Hz sample data uses a lot of
memory!
3.1.2 Data Retrieval
The Retrieve By Date Range button in the Data Retrieval section retrieves files via remote or direct (USB)
MetLink connection from the internal memory and saves them to the Raw file folder on your PC. Double-clicking
on files in the Raw file folder will open a QuickView window (see section
) that shows a snapshot of recorded
statistical data for each logger channel. The date range of available data is shown; leave dates blank to retrieve
all available data files. More detailed information on retrieving and importing data can be found in
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