Interphase iScan V90, Operation Manual

Page: 21 / 40

21
Transducer Level (L) and
Keel / Depth Offset (K)
If you do not adjust the
KEEL or DEPTH OFFSET, the
iScan V90 will display depth readings below the
transducer. Normally the transducer is mounted at some
distance above the bottom of the keel. If this distance is
entered as a positive (+) number,( the
KEEL OFFSET)
the display will show the depth below the keel. The
transducer is also mounted below the water line. If this
distance is is entered as a negative (-) number, (the DEPTH
OFFSET) will show the depth below the water line.
The iScan V90 also includes an adjustments to compensate
for some transducer installation problems, especially thru-
hull installations, where the transducer’s stem is not
perfectly vertical to the water’s surface. This problem can
be caused by improper installation, or by changes in the
boats fore/aft weight.
When the boat is over a known level bottom, the forward
vertical ( VERT) scan display should show a level line. If
the bottom display is slanted upward or downward (as in the
pictures at left), note the approximate angle of the
unwanted upward or downward slope on the display. Then
proceed to the TRANSDUCER adjustment menu, as
above, and press the softkey buttons to adjust the
Level (L). It is possible to /- 15 degrees. Positive
numbers will tend to make the bottom slope upwards and
negative numbers will make the bottom slope downwards.
After making the adjustment, go to the forward vertical
display and verify the correction. Once adjusted, the iScan
V90’s memory will retain the setting.
Demo
If the
DEMO softkey is pressed the iScan V90 will go into
a demonstration mode where simulated data is sent to the
display. This mode can be a useful tool to help understand
the operation of the unit. To exit the DEMO mode, press
the
DEMO softkey again.
System Reset
The
iScan V90 remembers most setting when it is turned
off. Normally this is good, however sometimes it can cause
problems and you may want to do a reset on the machine to
restore it to the factory defaults.To do this, turn the unit on
while simultaneously pressing both the
CURSR and PWR
buttons.
K= +03.1 Ft
L= -5
K = 0.0
L = 0
/- 15 degrees
Level Bottom Correctly Shown
Level Bottom Appears to Slope Downward
Level Bottom Appears to Slope Upward
Set Depth Offset
—
or Keel Offset
+