IC Flashcards
What is the purpose of the EM log
Measures the speed of the ship through water
What is the circuit designation for the EM log?
Circuit Y
What are the five parts of the EM log?
Rod meter/pit sword Indicator/transmitter Sea valve Remote controller Indicator type 1/type 2
How long is the rod meter/pit sword
6 feet in length
Which part of the pit sword houses the electrical wiring of the rod meter
Junction box
Which part of the pit sword is the lower part of the rod meter and is made of fiberglass
Sensing element assembly
Which part of the pit sword is the upper part of the rod meter and is made of stainless steel
Rod weldment
When the rod meter is lowered into the water, what is produced by the sensing unit on the fiberglass end?
Electromagnetic field
The Electromagnetic field is used to detect changes in the ships speed by
Electromagnetic induction (EMI)
The monel buttons (sensing unit), one on each side of the rod meter, is made of what?
Nickel copper alloy
The signal voltage produced by the rod meter is approximately what?
325 microvolts per knot
The rod meter is located in the pitsword trunk inside what?
FWD JP5 pump room
The BHR has what type of pitsword?
Retractable pitsword (this means we are able to pull our pit sword into the hull of the ship)
The rod meter can only be raised and lowered when speed is under what?
Under 10 knots
What are the three modes of the indicator/transmitter?
Log mode or underwater mode
Dummy mode
Manual mode
What is the normal underway mode for the EM log?
Log mode or underwater mode
What is the mode used when the pit sword is raised (during leaving and entering Port) or broken
Dummy mode
In dummy mode, the speed is entered by the remote control unit in what location?
FWD EOS
What is used when log mode and dummy mode do not work?
Manual mode
What is the knob on the indicator/transmitter that can be turned to input the ship speed?
Manual knob
What are the parts of the indicator/transmitter?
Case/power supply
Electronica unit assembly
Mechanical unit assembly
Calibration assembly
What receives a signal from the rod meter and amplifies the error signal?
Indicator/transmitter
What displays the ship speed through the water?
Indicator/transmitter
The indicator/transmitter Also displays the
Total nautical miles traveled
What transmits the ship speed to various repeaters and other navigational equipment through the ship?
Indicator/transmitter
What is also used to change between the three modes of operation?
Indicator/transmitter
The indicator/transmitter is located where?
FWD IC
What is used to provide water tight integrity of the underwater log truck?
Sea valve
The sea valve is open and closed to raise and lower what?
Pit sword
The sea valve is also located in the what?
Pit sword trunk in the FWD JP5 pump room