Frequently Asked Questions (FAQs)
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Measurement defined
process of experimentally obtaining information about the magnitude of
a quantity.
NOTES
- Measurement implies a measurement procedure, based on a
theoretical model.
- In practice, measurement presupposes a calibrated measuring
system, possibly subsequently verified.
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What is metrology?
of science or technology they occur. Metrology, along with of science or
technology they occur. Metrology, along with assessment and
standardization, is one of the three pillars of sustainable development
infrastructure of a country (More info on ISO publication on the three
pillars - PDF,96KB).
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A growing need for reliable measurement results
Measurements play a key role in modern life - in industry as well as in
trade and in society in general, in assuring quality and safety in
assigning costs. In addition, there is a growing need in science and
technology for increasingly accurate and more complex measurements.
In Ethiopia, the Government has authorized QSAE as the custodian of
the National standards for the base (length, mass, temperature, etc)
and some derived measurement quantities of the SI system.
The National Metrology Laboratory responsibility is to meet the needs
of industry and society for traceable measurements (e.g. traceable
calibration service) and to provide close access to measurement
technology competence.
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Sl (Systeme International)
SI is a coherent system of units defined through international
consensus. Whenever possible, the definitions are based on
established laws of nature, and the units can be realized and
maintained through primary standards constructed according to well
defined procedure.
Seven SI base units, name & symbol:
(1) Length, metre & m; (2) Mass, kilogram & kg; (3) Time, second & S;
4) Electric current, ampere & A; (5) Thermodynamic temperature, kelvin & K; (6) Amount of substance, mole & mol; & (7) Luminous intensity,
candela & cd.
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Calibration defined
definition (a)
operation establishing the relation between quantity values provided by
measurement standards and the corresponding indications of a
measuring system, carried out under specified conditions and
including evaluation of measurement uncertainty.
definition (b)
operation that establishes the relation, obtained by reference to one or
more measurement standards, that exists under specified conditions,
between the indication of a measuring system and the measurement
result that would be obtained using the measuring system.
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Calibration service
One of the pillars of a standardization infrastructure is the metrological
system in place at a national level.
Typical measurement areas in which calibration is done are:
Dimensional measurement
Mass measurement
Volume measurement
Density measurement
Pressure measurement
Force measurement
Temperature measurement
Electrical measurement
Frequency measurement
Contact Us for info on how to obtain a calibration service in Ethiopia.
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For more information, please contact Tadesse Solomon, I-QUAS
Contact at: iquas@ethionet.et or (251-11)
662 3846 or (251-91) 161 3073, Addis Ababa, Ethiopia.
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F A Q s - M e a s u r e m e n t
