Simrad EQ60 - Manual (Page 110)

Simrad EQ60
98
857-164342 / Rev.C
The History function is equivalent to the print function. The
echo sounder continuously saves echogram ”printouts” or
echogram pictures to the internal harddisk. These can later can
be recalled on the display.
The horizontal width of each echogram picture roughly
corresponds to the width of the display. History memory is
organised as a circular loop; the newest echogram picture
overwrites the oldest one. The circular memory holds several
hours of echogram recording. The history function allows you
to quickly look through echogram pictures covering the past
hours.
Mode
The echo sounder either pings normally displaying the echo
signal received at the transducer, or it replays a previously
recorded echo signal stored in one of the four Raw Data
Memory locations.
Normal - Click the Normal button to enter Normal ping mode.
Replay - Select Replay for Replay (playback) mode.
Files - When selecting Replay mode, click the Files button to
activate the Replay dialogue to select the replay file.
External trigger
The Auxiliary connector on the General Purpose Transceiver
(GPT) includes a trigger input signal for transmit
synchronisation with external equipment. Normally, the EQ60
transmits as soon as it is ready for the next ping. Transmission is
delayed until a pulse is detected at the trigger input line when
the Extern Trig entry is checked.
Click this option to enable the EQ60 to work in Slave mode.
The echo sounder will then await the external trigger from the
peripheral system, and the transmissions from the systems will
be synchronized.
When this option is not checked, the EQ60 operates normally as
a Master system.
The external triggering system is explained in more detail in the
EQ60 instruction manual. Refer to the Cable layout chapter in
the printed book.
Note
External transmit synchronisation is only active in Normal ping
mode.
History
Echogram pictures are saved continuously to the harddisk when
the Save box is checked.