Time-Amplitude-Frequency (T-A-F) - A special electronic unit for measuring the TVG function of research echo sounders
Abstract
High precision in hydroacoustic instruments for fisheries research demands high precision and
reliability in the test instruments. To simplify the test measurements, a special test unit has been
developed. The operating principles are described, and a technical description is given for this
special-purpose signal generator. Application of the unit is described in detail, and an easy way to
verify the accuracy of signal amplitude and frequency is recommended. Finally a computational
example to derive correction factors is given.
Publisher
[Fiskeridirektoratets havforskningsinstitutt]Series
Fiskeridirektoratets skrifter, Serie Havundersøkelservol 17 no 16