Checking The Telemetry Link To The Towfish; Checking The Transmitters Before Deployment; Checking The Receivers Before Deployment; Figure C-17: Transmit Waveform - Klein 3000 Series Operation And Maintenance Manual

C-22
APPENDIX C General Setup, Configuration and Troubleshooting
C.6.2 Checking the Telemetry Link to the Towfish
Turn the TPU on and check the CARRIER LOSS and LOCK LOSS lights. The
lights should be off. If they are on or flickering, there is a problem. Again, a
telemetry link problem could be one or more of the following: towfish fuse failure,
cable assembly problems, miswire, open, using too long a cable, using wrong type
of cable, or a failure in the towfish.
C.6.3 Checking the Transmitters before Deployment
There are two transmitters, 100 kHz and 500 kHz. To check that the transmitters
are working, turn the system on and wait for the system to boot up. Start SonarPro
and set the range to 100 meters. You can place an oscilloscope probe with the
scope tip along the transducer to see the transmit waveform as shown in
Figure C-17. The transmitters fire in a staggered mode with about a 500-µs delay.
The first pulse will be the 500-kHz transmitter followed by the 100-kHz
transmitter. If there is a problem with a transmitter, it will show up as a very weak
transmit waveform or none at all.
C.6.4 Checking the Receivers before Deployment
With the towfish running on deck, start SonarPro and open the Sonar Viewer
window for each the high and the low frequency. Set the range to 150 meters and
allow the TVG gain to adjust. Rub the transducers firmly, one transducer at a time.
This is the rub test. The image in the Sonar Viewer window should look something
like that shown in Figure C-18.
Series 3000 Sonar System Operations and Maintenance Manual
Transmit Waveform
Figure C-17:
11210066, Rev. 11