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OCTAL NUMBER SYSTEM
A number system based on powers of eight. This system is used extensively in computer work .
OFF-LINE TEST EQUIPMENT
Equipment that tests and isolates faults in modules or assemblies removed from systems .
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 .
Resistance in ohms .
A meter used to measure resistance  .
OHMS PER SQUARE
The resistance of any square area of thin film resistive material as measured
between two parallel sides .
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 .
An antenna that radiates and receives equally in all directions (nondirectional)  .
ON-LINE TEST EQUIPMENT
Continuously monitors the performance of electronic systems .