Simrad EQ 55 Especificações descarregar pdf (Página 25)

An echosounder is composed of a display screen, processor, and receiver/

transmitter unit which in the case of the EQ32 MKII, are housed in one

unit. Connected to this unit by a shielded cable is the transducer which is

mounted horizontally on the bottom of the hull or on the transom.

$ISPLAYSCREEN

The display screen presents in graphic and numerical form the informa-

tion the processor is receiving and accumulating from the transducer.

0ROCESSOR

The processor is the "brains" of the echosounder. It is sealed inside the

unit which protects it from harm. The processor is composed of highly

sophisticated microprocessor, memory and logic circuitry.

2ECEIVERTRANSMITTER

The receiver/transmitter (often called the "transceiver") section of your

echosounder takes it’s commands from the processor. The processor

tells the transceiver to activate the transmitter. The transmitter sends a

high voltage transmit "ping" to the transducer mounted on the hull.

At that point the transmitter’s job is done and the receiver takes over.

See Figure 1.

The receiver is also connected to the transducer and amplifies the very

small signals received as echoes from fish and the sea floor which arrive

at the transducer (see Figure 2). The receiver is designed to reject other

signals as much as possible and to provide enough amplification to see

even relatively small targets at long ranges.

The amplified receiver signals are then send to the processor to be shown

on the display screen.

4RANSDUCER

A transducer is a ceramic element in a rugged housing made from rein-

forced plastic, bronze or stainless steel.

0ARTSOFANECHOSOUNDER

0RINCIPLESOFOPERATIONOFANECHOSOUNDER #HAPTER

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Simrad EQ 55 Especificações Página 25