calibration, metrology

Instrumental drift

Instrumental drift is continuous incremental change over time in indication, due to changes in metrological properties of a measuring instrument.
calibration

Calibration

Calibration, operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties
metrology

Metrological traceability

Metrological traceability, property of a measurement result whereby the result can be related to a reference through a documented unbroken
metrology

Indication

Most measurements are based on indications provided by measuring instruments or measuring systems. An indication (e.g. an instrument signal or
Primary reference measurement procedure
metrology

Primary reference measurement procedure

Primary reference measurement procedure used to obtain a measurement result without relation to a measurement standard for a quantity of
metrology

Preliminary to making a measurement

Before making a measurement, the quantity must be clearly defined, bearing in mind the purpose for which the experimental result
metrology

International System of Quantities

International System of Quantities is that system of quantities based on the seven base quantities: length, mass, time, electric current,
calibration, metrology

System of quantities

System of quantities , set of quantities together with a set of non-contradictory equations relating those quantities. In practice, it