Appendix I Glossary - Cont'd -141210121

calibration activity (laboratory) during the reporting

HYDRAULIC ACTUATOR A device that converts

period.

hydraulic pressure to mechanical movement.

MODIFICATION ACTIONS The number of

INACTIVE CODE An asterisk (*) preceding the

modifications performed by the related calibration

customer/laboratory code indicating that the

activity (laboratory) during the reporting period.

activity is inactive (not currently accepted by

MEASURE), and no updating occurs. (formats 100

MODULE Subassemblies mounted in a section.

& 105)

MONITOR One of the principal operating modes of a

INTERLOCK A device that prevents an action from

data logger that provides a constant check of plant

taking place at the desired time, but that allows the

conditions.

action when all required conditions are met.

MONITORING POINT The physical location at

JACKING GEAR An electric motor-driven device

which any indicating device displays the value of a

that rotates the turbine shaft, reduction gears, and

parameter at some control station.

line shaft at a low speed.

NO-BREAK POWER SUPPLY A device that

LINEAR Straight line relationship where changes in

supplies temporary power to the console during

one function are directly proportional to changes in

failure of the normal power supply.

another function.

NORMAL MODE Operating condition at normal

LOGIC The basic principles and applications of truth

ahead speeds, differing from maneuvering, where

tables, interconnections of off-on circuit elements,

certain functions, pumps, or valves are not required,

and other factors involved in mathematical

while others are for proper operation of ship and

computation in automatic data processing systems

machinery.

and other devices.

NULL POSITION-- Condition where the output shaft is

LOGIC DIAGRAMS In computers and data pro-

positioned to correspond to that which the input

cessing equipment, a diagram representing the

shaft has been set.

logical elements and their interconnections without

ONE-LINE SCHEMATIC A drawing of a system

necessarily expressing construction or engineering

using only one line to show the tie-in of various

details.

components; for example, the three conductors

LOGIC INSTRUCTION Any instruction that

needed to transmit 3-phase power are represented

executes a logic operation that is defined in

by a single line.

symbolic logic, such as AND, OR, NAND, or NOR.

ONE-LINE SKETCH A drawing using one line to

MAINTENANCE Work done to correct, reduce, or

outline the general relationship of various

counteract wear, failure, and damage to equipment.

components to each other.

MANUAL THROTTLE CLUTCH Means of

OPEN LOOP System having no feedback.

mechanically disconnecting the throttle hand-

OPERATING CHARACTERISTICS Combination

wheels, mounted on the engine-room console, from

of a parameter and its set point.

the reach rods that are connected to the throttle

valves.

OR GATE A gate that performs the logic OR function.

It produces an output 1 whenever any or all of its

METRL CYCLE The number of months established

inputs is/are 1.

as the optimum period of time the corresponding

PARAMETER A variable, such as temperature,

equipment can be used before recalibration is

pressure, flow rate, voltage, current, or frequency

required.

that may be indicated, monitored, checked, or

MFR A five-character alpha/numeric or three-

sensed in any way during operation or testing.

character alphabetical code representing the

PERIPHERAL Existing on or new the boundary of a

specific manufacturer for the corresponding

surface or area.

equipment model number.

PILOT MOTOR A small dc motor that drives the

MODIFICATION MAN-HOURS The total man-

input shaft of an actuator.

hours expended on modifications by the related

AI-3