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What is known...

Metrological Measurand
Definitions F: Mesurande – D: Messgröße
Physical quantity of a measurement. In other
words, the measurand is the length or the angle
Range of indication as measured or to be ­measured.
F: Etendue d’indication – D: Anzeigebereich
The range of indication lies between the high­ Measured value
est and lowest display values of a ­measuring F: Valeur mesurée – D: Messwert
instrument. Any measured value expresses the result of a
measurement. Therefore, this value is directly
associated with the measurand and further
Measuring range allocated to the output feature (e.g. display)
F: Etendue de mesure – D: Messbereich of a measuring instrument or device.
The measuring range of an indicating device A measured value is expressed as the product
is the range within which the measured values of both numerical value and unit.
cannot exceed the maximum permissible errors. The measured value includes the true value plus
For tools having several measuring ranges, these the random and systematic errors of the relevant
errors may vary from a range to another. tool.
The measuring range may well be contained wit-
hin the related whole range of indication. Result of measurement
F: Résultat de mesure – D: Messergebnis
Product of a measured value once corrected on
Measuring span the basis of the known systematic errors.
F: Champ de mesure – D: Messspanne This result is further increased by the uncer-
This span equals the d­ ifference between both tainty of measurement, which includes the ran-
first and last values of the measuring range as dom as well as any unknown systematic error.
specified.
First value Example: Last value
0 Measuring range 0 to 150 mm 150 mm
Displacement range
F: Etendue de déplacement – D: Verstellbereich First value 0 mm
Measurand related extent within which the Last value 150 mm
meas­uring range can be moved.
Difference 150 mm = Measuring span

Application range 0 Upper end stop
F: Etendue d’application 90 10
D: Anwendungsbereich 80 20 Post
The application range is equal to the sum of both span
displacement and measuring ranges. 70 30
60 40
Note: The first and last values make each range different from 50
one another.
Range of indication
Application range Measuring range
300 mm to 400 mm
Lower end stop Pre span
Measuring range
Example
± 0,4 mm

Measuring span: 0,8 mm

Measuring range 300 mm to 325 mm

25 0
25 10 10
25 20 0,01 mm 20

25 mm 30 30
Measuring span 40 40

75 0
Displacement range
0 to 75 mm

Range of indication ± 0,45 mm

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