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112 C-Series Display Reference Manual
Transducer Calibration
The C-Series display receives the image from a DSM which processes sonar signals
from a transducer mounted in the water. If the transducer is equipped with a speed
paddle wheel and temperature-sensing thermistor, the DSM calculates speed and
temperature. To ensure accurate readings it may be necessary to calibrate the
transducer(s) by applying offsets to depth, speed and temperature. As these settings
are held in the DSM and relate to the transducer, they are applied system-wide.
The Fishfinder Setup Menu provides the following set up options for your transducer:
MENU ITEM
OPTIONS
(Default in bold)
Select Transducer
When selecting a transducer, the DSM reports to the C-Series
whether it sees a 600W or 1kW transducer. The C-Series then
allows you to select an appropriate transducer from the 600W or
1kW list.
600W detected:
P65/66
P79
P319/B117/SS555
B66V/B66VL
B744V/b744VL/SS544V
B45
1kW detected:
B256
B260
R99
Select Speed Transducer
Select the equipped speed transducer.
Note: This option is only available if the selected transducer is one
that does not include an integrated speed transducer.
NONE
UNKNOWN
B120/P120 ST 600
ST69
Depth Offset (Waterline) or (Keel)
When the offset is '0' or positive (Waterline), the offset represents
how far below the water's surface the transducer is.
When the offset is negative (Keel), the offset represents how far
below the transducer the keel is.
0 feet
+/- 9.9 feet
Speed Offset
Specify the offset to calibrate the speed transducer (if fitted).
100%
1- 200%
Temperature Offset
Specify the offset to calibrate the thermistor (if fitted).
0°F
+/- 9.9°F
Frequency Calibration...
Hides the setup menu and brings up a set of soft keys to tune the
transducer frequencies. For details, see
page 114
.
50 kHz
200 kHz
81221_4.book Page 112 Tuesday, February 28, 2006 5:24 PM