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SPECIFICATIONS OF THE DOPPLER SPEED LOG
DS-80
1. GENERAL
(1) Speed Range Fore-Aft: -10.0 to +40 knots through-the-water
(2) Distance Run 0.00 to 999,999.99 nautical miles through-the-water
(3) Working Depth Water depth greater than 3 m beneath the keel.
(4) Working Frequency 1.0 MHz
(5) Speed Accuracy 1.0% or 0.1 knots whichever is the greater
(6) Distance Accuracy 1.0% or 0.1 nm whichever is the greater
Note: Accuracy is subject to shallow water effects, to the effect of wind, current and tide, and
sensor location. Any ultrasonic equipment having the same frequency may interfere with
speed measurement. The Doppler Log transducer should be installed apart from the
transducers of such kind of equipment.
2. DISPLAY UNIT
(1) Display Character size 15 or 21 mm H on monochrome LCD
(2) Indication
Ship’s speed Fore: c**.* knots (+40.0 kt max.)
Aft: d**.* knots (-10.0 kt max.)
Distance run ******.** nm
(3) Other Function Diagnostic check
3. DIGITAL INTERFACE
(1) Serial Signal
Output: 2 ports; VBW, VLW in IEC 61162-1 (NMEA 0183 Ver 2.0)
Input: 1 port; IEC 61162 (NMEA 0183 Ver 2.0)
(2) Analog Signal Speed signal for Analog display: 2 port
-3.3 mA to 10 mA/ -10 kt to +30 kt
Analog current output: 1 port
4 mA to 20 mA/ -10 kt to 30 kt
Analog voltage output: 1 port
-3.3 V to 10 V/ -10 kt to 30 kt
(3) Distance run output 2 ports; Contact closure each 0.005 nm, forward speed,
30 VDC: 0.4 A
(4) System Check signal 1 port, 30 VDC: 0.2 A, default: closed