## QIMT Glossary

Definitions of Metrology terms & phrases.

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**Procedure for adding a Definition:**

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- Under the first required field labeled 'Concept', enter the Metrology word or term.
- In the 'Description' Field, put the definition, don't forget to use the "DeWord" button to remove MS Word formatting if you are copying and pasting from MS Word; see lounge forum for note regarding this issue.
- Ignore the other entries and submit.

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Browse the glossary using this index

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**ALL**

## S |
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## SP Sveriges Provnings- och Forskningsinstitut, the national metrological institute of Sweden. |

## Span Modulus of the difference between two limits of a nominal range. |

## Stability The ability of a measuring instrument to maintain constant its metrological characteristics with time. |

## Standard See Measuring standard. |

## standard deviationStatistics: "Measure of the unpredictability of a random variable, expressed as the average deviation of a set of data from its arithmetic mean and computed as the positive square root of the variance. Customarily represented by the lower-case Greek letter sigma (σ), it is considered the most useful and important measure of dispersion which has all the essential properties of the variance plus the advantage of being determined in the same units as those of the original data. Also called root mean square (RMS) deviation." As per the ISO GUM, the standard deviation = the standard uncertainty for the given contributor. |

## Standard deviation, experimental Parameters for a series of n measurements of the same measurand, characterises the dispersion of the results and is given by the formula for standard deviation. |

## Standard Reference Material, see Reference Material, Certified. |

## Standard, compound A set of similar material measures or measuring instruments that, through their combined use constitutes one standard called a compound standard. |

## Standard, transfer Standard used as an intermediary to compare standards. |

## Standard, travelling Standard, sometimes specially composed, for use in making comparisons between standards at different locations. |