Metrology
"NATIONAL BODY FOR STANDARDS AND METROLOGY" CJSC
NATIONAL BODY FOR METROLOGY
MINISTRY OF ECONOMY OF THE REPUBLIC OF ARMENIA
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National etalons

 

   A measurement standard (etalon) is used to maintain and transfer measuring unit to other measuring instruments, determining the given quantity with stated quantity value and associated measurement uncertainty, and is considered a reference, which differs with the resistance of the material and in the course of time undergoes the least changes.

  There are the following types of measurement standards (etalons):

1. International standard - standard recognized by signatures to an international agreement and intended to serve worldwide.

2. National standard – standard recognized by national authority to serve in a state as the basis for assigning values to other measurement standards.

3. Primary standard – reference measurement procedure, created as an artifact, chosen by convention, which reproduces the measuring units with the highest accuracy of measurement result possible in the scientific and technological field.

4. Secondary standard - standard established through calibration with respect to a primary measurement standard for a quantity of the same kind.

5. Travelling standard - standard, designed to transport and use between different locations  for calibration of standards, which for some reasons cannot be directly compared with other measurement standards.

6. Reference standard - a standard designed for the calibration of the lower class standards for the quantity of the given kind in a given organization or at a given location.

7. Working standard - standard that is designed to calibrate or verify measuring instruments or measuring standards.