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9
5. Press the [ENT] key to finish and press
the [MENU] key twice to close the
menu.
The distance run indication reads 0.00.
1.7 System Setting
The system setting provides the
fundamental parameters for intended
performance of the DS-80.
1.7.1 Displaying the system menu
1. Press the [MENU] key to open the
menu.
2. Select SYSTEM MENU and press the
[ENT] key.
SYSTEM MENU
SHIP SPEED AVG 15 SEC
SPEED OFFSET +0.0%
TRACK DEPTH 2.0 m
XDR OFFSET +00˚
SPD DATA SELECT
DOPPLER
ENT: SET
1.7.2 Ship speed average
Wind and currents affect ship’s speed, and
speed data is averaged over the time period
set on this menu. Increase the speed
averaging period if the speed reading is
unstable.
1. Open the SYSTEM MENU.
2. Select SHIP SPEED AVG and press the
[ENT] key.
15 SEC
30 SEC
45 SEC
60 SEC
3. Select averaging time period desired
among 15, 30, 45 and 60 seconds.
4. Press the [ENT] key.
5. Press the [MENU] key twice to close the
menu.
1.7.3 Speed offset (calibration)
Calibration of any speed log is necessary
through the sea trials during the
commissioning tests. Fill in the calibration
sheet which is on page 25 of this manual.
Us the resultant data to calculate speed
offset and enter it as below. The setting
range is -25.0% to +25.0%.
1. Open the SYSTEM MENU.
2. Select SPEED OFFSET and press the
[ENT] key.
SYSTEM MENU
SHIP SPEED AVG 30 SEC
SPEED OFFSET +0.0%
TRACK DEPTH 2.0 m
XDR OFFSET +00˚
SPD DATA SELECT
DOPPLER
ENT: SET
3. Select the digit to change with or
and change the value with
or
on
the Omnipad.
4. Press the [ENT] key.
5. Press the [MENU] key twice to close the
menu.
1.7.4 Tracking depth
Doppler shift measuring depth in the DS-80
is 2 m at default. If the speed readout is
unstable due to air bubbles near the ship’s
hull, increase or decrease the track depth to
stabilize the readout. The setting range is
1.0 m to 9.9 m.
1. Open the SYSTEM MENU.