Simrad EQ 55 Especificaciones descargar pdf (Pagina 72)

EQ42/50/52 Glossary of terms Appendix A

Transducer – the transducer serves as the acoustic “loudspeaker” and

“microphone” to send and receive the signals through the water.

Transducers are most often made from ceramic elements carefully built into a

robust housing. The ceramic elements change shape when a voltage is placed

across them (when the EQXX transmits a signal), and they also generate a

voltage when they encounter sound waves (as when the EQXX receives an echo).

Transmit power – should normally be left on AUTOmatic. The modes available

are: AUTO, 1000W, 500W, 100W and 10W.

TVG – Time Varying Gain – is a control that allows the EQXX to make correc-

tions for most of the losses and absorption that occurs as sound energy passes

through sea water.

There are three settings to choose from, Normal, Special and OFF.

The setting “Normal (20 log R) is for general fish finding at depths down to 50m

(150’) and it will also give a uniform bottom echo presentation at shallow, mid

and deep water.

The setting “Special (40 log R) will adjust the TVG to show the same echo

strength for a given size fish at varying depths.

The OFF position is used for net sounders. In OFF position the TVG is inactive

which means that the sounder operates with a fixed gain between each transmitter

pulse. Auto range is switched to manual.

VRM – Variable Range Marker – this refers to a horizontal black line shown on

the display screen. The user can measure the range to targets shown on the

display screen by use of the VRM. The depth to the VRM can be seen in the top

left side of the screen for approximately 5 seconds after pressing the

[VRM]

key.

White line – is a control which places a white/black line at the displayed sea

floor and blanks out 4 pixels just below the line. The purpose of this is to help the

user detect targets, such as fish, which are very close to the sea floor and whose

echoes tend to merge with those of the sea floor itself.

ZOOM – see Expansion.

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Simrad EQ 55 Especificaciones Pagina 72