SonTek
ADP Software Manual Version 6.42 (November 1, 2000)
11
2.4.2. Velocity Profile Data
The data acquisition mode has two graphical displays: one presents velocity component data in
BEAM, XYZ, or ENU coordinates, and the other gives current speed and direction. The plots
associated with each display type are described below.
Velocity component plots: (shown in Figure 2)
The first plot (“Vel (cm/s)”) displays the most-recent velocity profile with separate lines for each
velocity component (either Beam 1/2/3, X/Y/Z, or East/North/Up). The second plot
(“σVel (cm/s)”) displays the standard deviation of each velocity component. For all plots, the
(Beam 1/X/East) component is shown in white, (Beam 2/Y/North) in yellow, and (Beam 3/Z/Up)
in green.
The third plot (“Log Amp (count)”) displays the acoustic signal strength as a function of depth
for each of the three acoustic beams. Signal strength is the magnitude of the return signal from
the water, and is a function of the frequency of the ADP, the amount of scattering material in the
water, and the range from the instrument. Signal strength is plotted using internal units called
counts; one count equals 0.43 dB. See the ADP Principles of Operation for more information
about interpreting ADP velocity, standard deviation, and signal strength.
Current speed and direction plots:
The first plot (“Speed (cm/s)”) displays the most-recent profile of water speed, and the second
plot (“Direction”) displays the most-recent profile of water velocity direction. Only horizontal
velocity data are used for the calculation of speed and direction (X and Y, or East and North,
depending upon the coordinate system selected). The units for direction are degrees clockwise
from north for the ENU coordinate system, or degrees clockwise from the positive Y-axis for the
XYZ coordinate system. The third plot (“Log Amp (counts)”) displays the acoustic signal
strength, as described above. This display type is not allowed if the BEAM coordinate system is
selected.
2.4.3. Control Keys
Three active keys may be used during data collection. The first two keys (F3 and F5) affect only
the graphical display and do not alter or interrupt data collection. The third key (ALT+F10) stops
data collection (it prompts you to confirm before stopping). Pressing the ESC key will remove
the pop up window if any key is pressed unintentionally.
F3 - Change Plot Type: (Multiple-choice)
Pressing the F3 key permits the user to select the type of graphical display.
“Beam, XYZ or ENU” plots the velocity data as individual components. “Speed / Dir” plots the
velocity data as current speed and direction.
F5 - Change Vel Scale: (Multiple-choice)
Pressing the F5 key permits the user to select the full scale of the velocity profile plot. Velocity
scale options are: ±10 cm/s, ±20 cm/s, ±50 cm/s, ±100 cm/s, ±200 cm/s, ±300 cm/s, and
±500 cm/s. Note that this setting affects both types of graphical displays (velocity component and
current speed), but does not affect recorded data.
[ALT] F10 - Stop Program: (Yes/No)
To Next Page
Loading...