Page 32 of 48
Date: 2021-12-10
Date: 20121-10-10
Page 33 of 48
InMan DL1-Multi Single Axis Doppler Speed Log System
InMan DL1-Multi Single Axis Doppler Speed Log System
Electronics AS
Electronics AS
CHAPTER 5: SEA TEST AND CALIBRATION
A speed log will require calibration of speed after installation.
There are 2 types of calibration procedure
1. Auto Calibration
2. Manual Calibration.
Auto Calibration is designed to ignore water current effects.
The procedure requires the vessel to sail a fixed length track at a constant speed. To remove the
current and wind effects, the same track should then be sailed in the opposite direction at the same
speed.
The average of these tracks will be used to calculate the speed difference between the real speed
(measured using the actual distance and the time it took), and the measured speed (using distance
from the sensor and the time it took).
This procedure must be performed at least once and then other speeds checked with the GPS or
manual calibration.
A calibration procedure may be performed from control unit or web browser.
For Control unit procedure please see operation manual.
For Calibration on web page
Open web browser with I.P. adress to JB70D1 Electronic unit.
Goto Calibration and start “Auto Calibration”
Set distance of first leg. The leg should take at least 5 minutes to sail (distance can be shorter when sailin
-
slowly). Example: A calibration point at 5 knots the distance should be 1nauutical mile.
If necessary, the procedure should be repeated at different speeds. SKIPPER recommend that
calibration is performed at a low speed and a high speed.
Draw a line on the chart with the required distance. Point A in start and Point B in end.
Start first leg. (The vessel crosses point A at the
calibration speed, towards point B).
• Stop first leg. (The vessel reaches point B on the chart
and turns to sail the line in the other direction).
• Save first leg.(If the presented speeds look correct, save
the leg and continue).
• Second leg, option. (If you do not have the possibility
to turn the vessel, you can use the first leg data directly.
If the first leg data is of poor quality, you may not be
given the option to continue).
• Start second leg. (The vessel crosses point B sailing
towards point A, sailing at the same speed as leg 1).
• Stop second leg. (Press as the vessel passes point B)
• Calibration result and save option. (The user can
decide to accept or reject this calibration, and in which
memory position to save it)
