SonTek/YSI
ADVField Software Manual (September 1, 2001) 9
Water Temperature / Salinity (Enter value)
Temperature and salinity are used to calculate the speed of sound, which determines the scale
factor used to convert the Doppler shift to velocity. You can enter temperature in °C or °F, de-
pending on the selected Units System (-2 to 50°C; 28 to 122°F). Salinity is entered in parts per
thousand (0 to 60 ppt). See the ADVField Principles of Operation for information about the ef-
fect of sound speed on ADV velocity measurements.
Speed of Sound (Derived value)
The speed of sound in water is shown in the menu for information purposes only. It is computed
from the user-input values of temperature and salinity and cannot be changed.
Sampling Rate (Enter value; 0.1 to 25 Hz)
ADV velocity measurements are vector-averaged internally and output at this rate. If recording is
selected, this rate also determines the rate at which data are recorded.
Velocity Range (Multiple choice)
The statistical uncertainty (noise) of ADV velocity measurements is approximately proportional
to the maximum velocity that the ADV can measure. As such, we recommend you set the ADV’s
velocity range to the minimum value that covers the range of velocities expected in a given ex-
periment. The velocity range for the 16/10-MHz ADV probe can be set to either ±3, ±10, ±30,
±100, or ±250 cm/s (±0.1, ±0.3, ±1.0, ±3, ±8 ft/s). The velocity range for the 5-MHz ADVOcean
probe can be set to ±5, ±20, ±50, ±200, or ±500 cm/s (±0.2, ±0.5, ±2, ±5, ±20 ft/s). See the AD-
VField Principles of Operation for more details about velocity range.
External Synchronization (Multiple choice)
You can synchronize the ADV with either an external data acquisition system or a remote trigger
through the SyncIn line provided in the processing module. You can set external synchronization
to the following three modes (see ADVField Operation Manual for details).
•
DISABLED
- The state of the SyncIn line is ignored.
•
START ON SYNC
- The ADV waits for the first sync pulse to start data collection.
•
SAMPLE ON SYNC
- The ADV waits for a sync pulse to trigger the start of each successive
sample. The ADV does not record an accurate time stamp with each sample when using this
option.
Coordinate System (Multiple choice)
This determines the coordinate system used for the display and recording of ADV velocity data.
XYZ
specifies the Cartesian coordinate system relative to probe orientation.
ENU
(East-North-Up)
specifies an Earth coordinate system that is independent of probe orientation.
ENU
can be used
only on systems with the optional compass/tilt sensor. When using
ENU
, be sure that the compass
is correctly installed and the probe is correctly oriented with respect to the compass. Incorrect in-
stallation can result in corrupted data. See the ADVField Operation Manual for details.
Recording Mode (Multiple choice)
This determines the mode for recording ADV velocity data to the computer disk. Two keys affect
data recording in data acquisition mode: Ctrl+Q and Ctrl+S. The effect of these keys depends on
the recording mode:
CONTINUOUS
or
BURST
(described below).
Samples per Burst (Enter value)
This determines the number of samples recorded per burst when using the
BURST
recording
mode. This parameter is ignored when using the
CONTINUOUS
recording mode.
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