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The Engineering Language by Ronald Hanifan

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RACK    A floor-standing structure primarily designed for and capable of supporting equipment. A frame upon which one or more units of equipment are mounted.

RACK AND STACK    An ATE that relies on system integration of applicable units of test equipment.

RADIAN    Metric unit of measurement for plane angles.

RADIANCE    Radiant power, in a given direction, per unit solid angle per unit of projected area of the source, as viewed from the given direction. Note: radiance is usually expressed in watts per steradian per square meter.

RADIANT EMITTANCE    Radiant power emitted into a full sphere by a unit area of a source, expressed in watts per square ...

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