Interphase Twinscope Operation Manual page 65

Sector Width & Steer Adjustment
The large rotary knob labeled "BEAM" can be used to
both adjust the beam scanning sector width and the
direction of the scan. For example, you may only want to
scan the area to the port (left) or starboard (right) side of
the boat.
Press the soft key labeled "BEAM" to bring up a sub-
menu of beam adjustment choices. By pressing the soft
key labeled "WIDTH", the rotary "BEAM" knob can be
used to adjust the scanning sector width. The actual
sector size will be shown on the display as the BEAM
width is adjusted.
By pressing the soft key labeled "STEER" the resulting
sector can then be steered throughout the possible 90
degree horizontal sector.
The RESET button can be used to quickly select three
popular scanning sectors. If the RESET button is pressed
once, the Twinscope will return to the full 90 degree
horizontal sector scan , pressing RESET again will put
the Twinscope into one of two preprogrammed forward
sector scans shown at bottom left.
Beam Speed (Resolution)
In its normal scanning mode "NORM", the Twinscope
will send out 50 forward beams and will alternate
between a forward beam and the down-looking beam. In
the "FAST" position, only 30 beams will be used and the
Twinscope will send 5 forward scanning beams for every
down-looking sample. In the "DETAIL" mode, the
RESET
Twinscope sends out 90 beams, one every 1 degree for
(Full Sector Scan)
the maximum resolution, but also at the slowest speed.
RESET
(Forward
Sector Scans)
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