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A table for the conversion of units of one measurement to equivalent units of another measurement.



Related Terms

CONVERSION SCALE

A scale for the conversion of units of one measurement to equivalent units of another measurement.

EX-MERIDIAN OBSERVATION

Measurement of the altitude of a celestial body near the celestial meridian of the observer, for conversion to a meridian altitude; or the altitude so measured.

WATER HAMMER

A sudden increase in pressure of water due to an instantaneous conversion or momentum to pressure.

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.

UNCERTAINTY

Refers to the difference between measurement by a field instrument and the 'true' or 'actual' quantity being measured.

STOKE (St)

Kinematic measurement of a fluid resistance to flow defined by the ratio of the fluid's dynamic viscosity to its density.

ERROR OF MEASUREMENT

The discrepancy between the result of the measurement and the true value of the quantity measured. NOTE 1: In general, 'true value' may be replaced by 'conventional true value'. NOTE 2: The discrepancy can be expressed as either: the algebraic difference between these two values, i.e. (error of measurement) = (result of measurement) - (true value), or as the quotient of that difference and the value of the quantity measured. These two forms of expression are often identified as 'absolute error' and 'relative error' respectively.

THERMOGRAPHY

The use of infrared thermography whereby temperatures of a wide variety of targets can be measured remotely and without contact. This is accomplished by measuring the infrared energy radiating from the surface of the target and converting this measurement to an equivalent surface temperature.

INFLUENCE QUANTITY

A quantity which is not the subject of the measurement but which influences the value of the quantity to be measured, or the indications of the measuring instrument, or the value of the material measure reproducing the quantity.

VERNIER CALIPER

A measurement device combining three tools in one: outside measurement, inside measurement and depth.

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