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Quality Control
• The SNR is checked as
• Each beam SNR is compared
SNR
• A warning is issued for low
• A warning is issued for 4 dB <
•
• The shape of the sampling
Peak Level
•
• The physical location of the
Peak Location
•
• No criteria defined for
• Temperature data included in
Temperature
a) The graphical display of the Quality Control parameters supplied during the
Automated BeamCheck is time series of each parameter. If there are any
significant variation between the beams, spikes are present in the data or Quality
Control warnings are issued we recommend the following steps,
i). Repeat the test at least once, after you verify that the probe and sampling
volume are well away from any underwater obstacles.
ii). Perform BeamCheck, described in
performance in more detail,
b) The display options for individual or all beam check data are listed in
The shortcut key on the keypad determines which beam SNR will be displayed,
FlowTracker2 User's Manual (January 2019)
Criteria
sufficient for reliable data
collection,
to be sure all beams perform
equally,
SNR < 4 dB,
SNR <7dB,
Beam SNR values differ.
volume curve is compared to
the expected shape. Any
significant deviation causes a
warning,
This criterion can only be
checked with sufficient SNR
(> 7 dB).
sampling volume is compared
to the expected location. Any
significant deviation causes a
warning.
This criterion can only be
checked for sufficient SNR (>
7 dB).
Temperature.
Automated BeamCheck to
allow user to analyze data
before measurement.
QC Warning
SNR
Peak Level >
QC
Peak
Location >
QC
None
6.3 Beam Check
121
SonTek – a Xylem brand
Graphic Display
to evaluate FlowTracker2
Table
8:2.
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