The amount of variation permitted in the size of a part or other measurable parameter.


Related Terms

TOLERANCE

The range of acceptable accuracy for measuring instrument. Tolerances are both + and - around the datum.

FREQUENCY TOLERANCE

The maximum permissible departure by the center frequency of the frequency band occupied by an emission from the assigned frequency, or by the characteristic frequency of an emission from the reference frequency. The frequency tolerance is expressed in parts in 106 or in hertz.

ACCURACY

The degree to which measurement by a field instrument compares with measurement by a laboratory instrument or other standard reference equipment. The instrument accuracy represent an allowable tolerance limit for single readings by a specific device. These tolerances (+ and -) are the maximum ranges of error for recording the product movement.

DEAD-BAND

The variance between the reading of an operating measuring device (e.g. meter) and a reference device (e.g. prover) which is so small that there is no need for recalibration. The dead-band is smaller than the tolerance range. Dead bands are expressed as both + and - around the datum line.

UNITED STATES NATIONAL MAP ACCURACY STANDARDS

A set of standards which define the accuracy with which features of U.S. maps are to be portrayed. 1. Horizontal accuracy: For maps at publication scales larger than 1:20,000, 90 percent of all well-defined features, with the exception of those unavoidably displaced by exaggerated symbolization, will be located within 0.85 mm of their geographic positions as referred to the map projection; for maps at publication scales of 1:20,000 or smaller, 0.50 mm. 2. Vertical accuracy: 90 percent of all contours will be accurate within one-half of the basic contour interval. Discrepancies in the accuracy of contours and elevations beyond this tolerance may be decreased by assuming a horizontal displacement within 0.50 mm. Also called MAP ACCURACY STANDARDS.

A.B.E.C.

Annular Bearing Engineering Committee. Used as prefix for tolerance grades of bearings as set up by this committee.

BILATERAL TOLERANCE

The amount that the size of a machine part is allowed to vary above or below a basic dimension; for example, 3.650 0.003 centimeters indicates a tolerance of 0.003 centimeter.

DODGE-ROMIG TABLES

Tabular data for acceptance sampling, including lot tolerance and AOQL tables.

PARAMETRIC EXCITATION

The method of exciting and maintaining oscillations in either an electrical or mechanical dynamic system, in which excitation results from a periodic variation in an energy storage element in a system such as a capacitor, inductor, or spring constant.

MICROPHONE TRANSDUCER

[ENG ACOUS] A device which converts variation in the position or velocity of some body into corresponding variations of some electrical quantity, in a microphone.

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