YSI SonTek ADVField, Technical Documentation Manual

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SonTek/YSI
Using Frequency Pressure Sensors with SonTek/YSI Systems (December 2001) 8
5.5. Windows Software Support
SonTek Windows-based software offers an alternative to the DOS extraction programs for han-
dling the external pressure sensor calibration data.
5.5.1. Downloading Calibration File Using SonUtils
The Terminal module within SonUtils provides an easy way to load the frequency pressure sen-
sor calibration file into the system processor. Simply establish communication with the system in
Terminal , click the
Load Druck Calibration
icon, choose the appropriate file, and the load process
will be performed.
5.5.2. Specifying Calibration File When Using ViewHydra
When opening a data file (.adr) with ViewHydra , you must supply a sensor calibration file (.drk)
to convert pressure data to dbars. If no pressure calibration is provided, all pressure data will be
displayed in raw frequency counts.
ViewHydra lets you save the calibration data in an associated
data file workspace, so the calibration data is loaded automatically the next time the data file is
opened.
After the data file is loaded, you can select the sensor offset from the processing menu to convert
the absolute pressure reading.
1. Run
DRUCK
/
PAROSFREQ
in Terminal and make note of the pressure reading with the system
in the air (say 10.025 dbar for this example).
2. In the
Processing|Sensor Calibration Settings…
menu, set
Sensor Type
to
Ext Pressure
, and
then enter a value of
–10.025
(for this example) in the
Offset
field to convert pressure data
into strain gage data (relative to the atmosphere).
3. Now use the
Processing|Recompute Burst Statistics File…
option to propagate the changes
into the burst-averaged data.
4. When exiting the program, use the
Save (Overwrite) Workspace
option to store the calibra-
tion and offset data. The program will now remember this information for this data set.
5.5.3. Using ViewADP with PCADP Data and Waves
Data collected by a standard ADP stores mean pressure data in dbars; no additional conversion is
needed. However, PC-ADP data and ADP wave series data (P-SERIES & PUV-Series) require
pressure calibration.
When opening a data file with ViewADP , click the
Load ExtPres CalFile
button to specify the
calibration file.
Notes:
1. If pressure calibration is not loaded, all pressure data will be displayed as raw frequencies.
2. If pressure calibration data is not loaded, wave data processing is disabled.
3.
ViewADP will save the calibration data in the associated data file’s workspace. This allows
the calibration data to load automatically the next time the data file is opened.