EDI DSTS-5A Manuel de l'utilisateur - Page 6

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5.6.2.1.3 CHIRP ECHO OPERATION

DSTS-5A Manual

5.6.2.1.2.3 The width of the fish echo tracks the width of the pulse from the

depth sounder in the auto-track mode. It can be manually set using the

'Wxxxx' command. For example, "W200 'enter'"will fix the fish echo

width at 200 uSec.

5.6.2.1.2.4 To make the fish echo stay on continuously type "E 'enter' ".

Type "e 'enter' " to turn the fish echo off.

5.6.2.1.2.5 To generate a fish arch use the "i" command to enter an value in

tenths of the selected units representing the arch height.

5.6.2.1.3.1 A chirp can be generated as a reply for the for the bottom echo.

This chirp is a linear frequency vs. time type. Inputs are the start

frequency, frequency step, step size, and the dwell time for the

frequency step. When the bottom echo occurs, it will sweep from the

start frequency through the number of steps.

5.6.2.1.3.1.1 The ending frequency will be equal to start frequency +

(number of steps * step size).

5.6.2.1.3.1.2 The duration of the chirp will be the number of steps *

dwell time. Note that minimum dwell time is about 5 uSec.

5.6.2.1.3.1.2.1 The dwell time is dependent on other factors such as

frequency so for maximum accuracy we recommend using an

oscilloscope to check the echo duration.

5.6.2.1.3.2 Enter the chirp menu by typing 'h'. A sub-menu appears and the

dwell time, start frequency, step size, and number of steps may be

entered. When the desired values have been entered type uppercase 'X'

to leave the chirp sub-menu and return to the -5A command menu so

depth, amplitude, etc. can be set. Note that typing 'X' does not stop the

chirp mode, it only exits the sub-menu.

5.6.2.1.3.3 To stop the chirp echo mode and return to normal operation,

type an uppercase 'H'. To re-start the chirp type 'h' and the previously

entered chirp settings will be used. These settings are not retained when

the power is turned off.

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Rev 140930-300