Pulsar dBi-M, Инструкция по эксплуатации

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dBi-M INSTRUCTION MANUAL
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By default, the DATEM in dBi transducers is ACTIVE which means it will grow
to cover any fixed obstructions in front of the current measurement echo.
Looking a
t the trace below, the only echo which can be “seen” by the echo
selection algorithm is the current selected echo at 4.2 metres.