Time-Amplitude-Frequency (T-A-F) - A special electronic unit for measuring the TVG function of research echo sounders
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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.
SeriesFiskeridirektoratets skrifter, Serie Havundersøkelser
vol 17 no 16