Page 47 of 68
Doc. P/N:
WSP-009-002
Version: V2.3
Issue Date: July 2014
Installation Manual
www.wassp.com
Figure 29 – Channel Signal Function Diagram
Expected Waveform Shape
Abnormal Waveform Shape
Gain Slider
Channel Selection
Range Slider
Commissioning Step 3: Channel Signal Function
The
Raw Beam Info
tab shows a voltage graph of signals received over a single
ping. The sliders at the bottom of the box allow you to change the horizontal
resolution of the graph, allowing you to fit signals onto the screen that would
otherwise be lost off the end of the screen.
You can select the desired channel from the
Channel
box. The slider on the right-
hand side of the box allows you to modify the gain of the graph. The screen in Figure
28 shows a typical transmission pulse with a reasonably weak bottom return, which
is a typical shape. When functioning correctly, all 26 channels should display very
similar information to each other.
Click the
Raw Info
button on the technician
Options
box to open the
Raw Info
box. Click the
Raw Beam
Info
tab. Adjust the gain and range of the graph so that
the graph’s maximum range only just fits on the axis. The graph should have a
small ripple at the beginning followed by a relatively blank period and then a strong
pulse with a rippling tail. This strong pulse is the return from the sea-floor. Use the
selections in the Channel box to view channels A to Z. Check that all of the channels
have similar shaped waveforms on them. If any have non random noise, significant
DC offsets or are without the correct general shape, resolve these problems
electrically (check connections).
Sea-floor
return
Tx Pulse
Noise and Fish
