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


Related Terms

POLARIZED-VANE AMMETER

An ammeter of only moderate accuracy in which the current to be measured passes through a small coil, distorting the field of a circular permanent magnet, and an iron vane aligns itself with the axis of the distorted field, the deflection being roughly proportional to the current.

PLATINUM RESISTANCE THERMOMETER

The basis of the International Practical Temperature Scale of 1968 from 259.35 to 630.74 C; used in industrial thermometers in the range 0 to 650 C; capable of high accuracy because platinum is noncorrosive, ductile, and nonvolatile, and can which the loads are placed.

NORMAL BAROMETER

A barometer of such accuracy that it can be used for the determination of pressure standards; an instrument such as a large-bore mercury barometer is usually used.

MIRROR SCALE

A scale with a mirror used to align the eye perpendicular to the scale and pointer when taking a reading; improves accuracy by eliminating parallax.

METER SENSITIVITY

The accuracy with which a meter can measure a voltage, current, resistance, or other quantity.

JOHANSSON BLOCK

A type of gage block ground to an accuracy of at least 1/100,000 inch (0.25 micrometer). Also known as Jo block.

SAMPLE PREPARATION

Fluid factors that can enhance the accuracy of the particulate analysis. Such factors include particle dispersion, particle settling, and sample dilution.

ASTRONOMICAL POSITION

A point on the earth whose coordinates have been determined as a result of observation of celestial bodies. The expression is usually used in connection with positions on land determined with great accuracy for survey purposes.

NAVSTAR GLOBAL POSITIONING SYSTEM

A satellite navigation system developed by the Department of Defense. The system is provides highly accurate position and velocity information in three dimen- sions and precise time and time interval on a global basis continuously, to an unlimited number of users. It is unaffected by weather and provides a worldwide common grid reference system. The objective of the program is to provide very precise position information for a wide spectrum of military missions. In addition, current policy calls for civil availability with a slight degradation in system accuracy required to protect U.S. national security interests.

CHRONOMETER RATE

The amount gained or lost by a chronometer in a unit of time. It is usually expressed in seconds per 24 hours, to an accuracy of 0.1s, and labeled gaining or losing, as appropriate, when it is sometimes called DAILY RATE.

Related questions

MarineProHelp 2018 - 2020