Testing The Installed H-Adcp; Table 1: Horizontal Waves Upper Cutoff Frequency - Teledyne WORKHORSE Operation Manual

WorkHorse H-ADCP Operation Manual
at wave band frequencies since we know the pressure sensor is not accurate if it
moves with the waves.
 Highest Usable Frequency
1. If for any reason, wave direction, wave height, or wave period seems unrealistic, try setting
the upper cutoff frequency to a more conservative setting (lower frequency).
Table 1: Horizontal Waves Upper Cutoff Frequency
8 Meter Bins
Depth
(meters)
Frequency
5 0.35
10 0.22
20 0.13
40 0.086
 Default Settings
1. 2Hz data is essential. Set the Baud Rate to ensure that data transfer can keep up with moving
whole ensembles at 2Hz.
2. Collect data in Broadband mode.
3. Choose 8 meter bins: 4 meters will work, but 8 meter bins are quieter.
4. Unless the platform rotation rate is significant, collect 4096 samples per burst continuously.
If the rotation is important, then collect 2048.
5. The upper cutoff frequency default is 0.2Hz (5 second period waves). While we can often out
perform this, it is a setting that will work across a wide range of deployment conditions and
environments.
6. You must collect data using Beam Coordinates in order to calculate waves data.

Testing the Installed H-ADCP

Once the H-ADCP is mounted in the water, it's time to communicate with it and make adjustments. Sur-
faceView will be used to adjust the pitch and roll settings as well as to check for abnormalities in the
acoustic backscattering intensity profile.
To test the setup:
1. Start SurfaceView.
2. On the Setup Wizard, click Real-Time. Click Next.
3. Once communications is established, on the Communications Settings screen, click Next.
4. Accept the default setting on the next several screens. Click Finish.
Pitch and Roll Adjustment
The deployment screen of the SurfaceView software indicates the pitch and roll angles of the H-ADCP.
Adjust the mount until the roll is zero. The H-ADCP rolls about the Y-axis. The roll must be zero.
Adjust the mount until the pitch is zero. The H-ADCP pitches about the X-axis.
A slight upward or downward pitch may be required to avoid beam interference from the
bottom or surface.
Period
2.86
4.55
7.69
11.63
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
4 Meter Bins
Frequency
0.32
0.195
0.12
0.078
May 2015
Period
3.13
5.13
8.33
12.82
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