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The conditions which must be fulfilled in order to use a measuring instrument correctly, taking account of its design, construction and purpose. NOTE: The conditions of use can refer, among other things, to the type and condition of the subject of the measurement, the value of the quantity measured, the values of the influence quantities, the conditions under which the indications are observed, etc.

Related Terms


The whole error of a measuring instrument under specified conditions of use.


Adjusting the measuring instrument to most closely determine the 'true' or 'actual' quantity being measured, or providing a correction factor or correction curve for the instrument readout.


A surveyor's measuring instrument consisting of 1-foot (30.48centimeter) steel links joined together by rings, 100 feet (30.5 meters) or 50 feet (15.25 meters) long. Also known as chain.


A measuring instrument for ascertaining changes in the horizontal component of the magnetic field intensity.


Galvanometer or other measuring instrument having two circuits or coils, usually identical, through which currents flow in opposite directions; the difference or differential effect of these currents actuates the indicating pointer.


The condition of a vessel with regards to materials, construction, equipment, crew and outfit which is considered safe for the trade in which it is employed


  1. An instrument used to measure continuously or at intervals a condition that must be kept within prescribed limits, such as radioactivity at some point in a nuclear reactor, a variable quantity in an automatic process control system, the transmissions in a communication channel or bank, or the position of an aircraft in flight. 2. To use meters or special techniques to measure such a condition. 3. A person who watches a monitor.


A particular value of an influence quantity stated in the specification of a measuring instrument as a basis for determining its intrinsic error.


In measurement technology, setting or compensating a measuring instrument or a weight in such a way that the indicated value deviates as little as possible from the actual value.


The range of values of the measured quantity for which any single measurement, obtained under specified conditions of use of a measuring instrument, should not be in error by more than a specified amount. NOTE: The effective range may be the whole or a specified part of the interval between the lower and upper range limits. Also known as measuring range, working range

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