Chapter 6 - Remote and Gyro Compass Systems Flashcards
In a detector unit, what keeps the flux valve horizontal to the Earth’s surface?
Universal joint and the pendulous weight
What must be done to cause an EMF to be induced in the flux valve, which is a detection of the horizontal element of the Earth’s magnetic field?
Steady flux must be changed into a changing one
What is the voltage used for the exciter coil (primary coil) in a flux valve?
Single-phase 23.5v 400 Hz AC
What is the angle between each leg of a flux valve?
120°
What would be the frequency in an AC pickoff if the exciter coil has a frequency of 800 Hz?
1600 Hz
When will the current induced in the leg of a detector valve be a minimum?
When it is at 90° to the Earth’s magnetic field lines
What controls the angle of the control transmitter rotor and therefore the angular output of the CX stator?
The outer gimbal of the DG
What is the rate of correction capability of the slaving system in a gyrocompass?
3° per minute
In a gyro magnetic compass system, what does the pilot have to do if the flux valve fails?
The pilot can also select DG/slaved to DG, removing the synchronising of the horizontal gyro to the detector unit. The pilot is now responsible for correcting the heading information approximately every 20 minutes, by precessing the compass gyro to match the direct reading compass
What is the slaving speed on start up where the heading information from the coupler disagrees with the flux valve by more than a very small amount?
600° per minute
