Chapter 1-4 EQ33 Introduction and safety summary
1.3.2 Echosounder features
A-scope - Activate A-scope by means of one of the dedicated function keys
(see section 1.3.1), or with echo display in active screen the function can be
turned on/off from the ECHO menu. Echoes are displayed in a ‘bar-graph’
format. The strength of the actual echo is indicated by both width and color
intensity.
Change frequency - Press and hold one of the function keys: [STND],
[B-LCK] or [ZOOM] for two seconds to toggle between 50 and 200 kHz, or
select via the ECHO menu.
Gain - Adjust gain with the [GAIN-] and [GAIN+] keys to just below the
point where you begin to see speckles of ‘noise’ on the screen.
Range - Select range by the numeric keys 1-9, or adjust with the +/- keys.
Key 0 will select Auto Range.
Bottom expansion - Press [B-LCK] from any display (see section 1.3.1), or
with echo display in active screen the function can be turned on/off from the
ECHO menu. Activate bottom expansion to expand the view of the bottom in
the echosounder display.
VRM expansion - Press [ZOOM] from any display (see section 1.3.1), or
with echo display in active screen the function can be turned on/off from the
ECHO menu. Activate VRM expansion to expand the view near the VRM -
Variable Range Marker - in the echosounder display. Use the up/down cursor
to activate and move the VRM line. Turn off the VRM line with [CLR].
Echo setup (presentation) - Press [ENT] from echo display to access the setup
display for either 50 or 200 kHz. Press [ENT] to confirm changes, or leave the
setup without having made any changes by pressing [MENU].
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