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O

OCTAL NUMBER SYSTEM

A number system based on powers of eight. This system is used extensively in computer work [13].


OFF-LINE TEST EQUIPMENT

Equipment that tests and isolates faults in modules or assemblies removed from systems [14].


OHM

The unit of electrical resistance. That value of electrical resistance through which a constant potential difference of 1 volt across the resistance will maintain a current flow of 1 ampere through the resistance [1].


OHM'S LAW

The current in an electrical circuit is directly proportional to the electromotive force in the circuit. The most common form of the law is E = IR, where E is the electromotive force or voltage across the circuit, I is the current flowing in the circuit, and R is the resistance of the circuit [1].


OHMIC VALUE

Resistance in ohms [1].

OHMMETER

A meter used to measure resistance [3] [16].

OHMS PER SQUARE

The resistance of any square area of thin film resistive material as measured
between two parallel sides [14].


OILCAN TUBE

A type of planar tube, similar to the lighthouse tube, which has cooling fins. The oilcan tube is designed to handle large amounts of power at uhf frequencies [6].


OMNIDIRECTIONAL ANTENNA

An antenna that radiates and receives equally in all directions (nondirectional) [10] [18].


ON-LINE TEST EQUIPMENT

Continuously monitors the performance of electronic systems [14].


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