Chapter 2. St40 Fluxgate Compass Transducer; Functional Test; Magnetic Deviation; Disassembly/Reassembly - Raymarine ST40 Service Manual

Chapter 2, Fluxgate Compass Transducer

Chapter 2. ST40 Fluxgate Compass Transducer

Functional test

Magnetic deviation

Disassembly/reassembly

ST40 Instruments Service Manual 83149-2
Disconnect the Fluxgate Compass from the instrument and check continuity as
follows:
Cable colour
Screen to blue
Red to green
Red to yellow
Red to screen
The Fluxgate Compass requires careful siting to achieve optimum performance. The
instrument software is able to correct the compass for most deviating magnetic fields
present when the linearisation procedure is carried out. Any further deviation
introduced after linearisation, will introduce an error between the Fluxgate Compass
and the ship's compass. This can be removed by carrying out the linearisation again.
If the displayed deviation is greater than +/– 15 degrees the Fluxgate should be
resited. For installation and calibration information, refer to the ST40 Compass
Instrument Owner's Handbook.
Note: The linearisation procedure should always be carried out if the Fluxgate
Compass has been exchanged, or moved from its original mounting position.
Connector Wiring Detail
Screen
Red Blue
Yellow
Green
1 2
Fluxgate Compass Transducer Exploded View
Resistance
< 10 ohms
< 5 ohms
< 5 ohms
Open circuit
3 4 6
1. Cover 6. Fluxgate sub-assembly
2. Seal 7. Body
3. Pivot retaining screw (x2) 8. Body screw (x4)
4. Bracket 9. Cable
5. Pivot sub-assembly
7 8
Hot melt glue
Cable tie
5
9
D4519-2
3 - 5