The purpose of this publication is to provide the descriptions, procedures and detailed parameter explanations required to allow for safe and efficient use of the ST90 system. The publication also provides you with a thorough understanding of the parameters and adjustments provided by the ST90 system.
Low noise is a key factor for high quality and reliable measurements. The performance of the ST90 system will always be limited by different noise sources. A high noise level will mask the echoes and make them difficult to read and interpret. The noise is measured while the ST90 system operates in Passive mode with the transmit pulses disabled.
The purpose of the Diagnostics dialog box is to allow on-line testing and verification of the hardware components in the ST90 system.The Transceiver page offers key information about each transceiver board in the Transceiver Unit.
The purpose of the Diagnostics dialog box is to allow on-line testing and verification of the hardware components in the ST90 system. Use the Transducer page to do a reception test to check the individual transducer elements. Any errors are then easily detected.
The performance of the ST90 system will always be limited by different noise sources. During this test, noise measurements are done for different vessel speeds. The weather and sea conditions for the noise measurements will be those at the time of the test.
The upper water layers of the sea contain a myriad of small air bubbles created by the breaking waves. When the hull moves through water it will cause a disturbance, and this will generate friction. The friction zone is called the flow boundary layer. All objects sticking out from the hull, or dents in the hull, will disturb the flow and will increase the thickness of the boundary layer. When the flow speed is high, the turbulence can be violent enough to destroy the integrity of the water. Small voids or cavities in the water will occur and this is called cavitation.
The technical specifications summarize the main functional and operational characteristics of the ST90 system. They also provide information related to power requirements, physical properties and environmental conditions.
The ST90 system can send and receive information to and from several different peripherals. All transmissions take place as datagrams with data sentences. Each datagram has a defined format and length.
