EXAMPLE 1 Triple-point-of-water cell as an intrinsic measurement standard of thermodynamic temperature.

EXAMPLE 2 Intrinsic measurement standard of electric potential difference based on the Josephson effect.

EXAMPLE 3 Intrinsic measurement standard of electric resistance based on the quantum Hall effect.

EXAMPLE 4 Sample of copper as an intrinsic measurement standard of electric conductivity.

NOTE 1 A quantity value of an intrinsic measurement standard is assigned by consensus and does not need to be established by relating it to another measurement standard of the same type. Its measurement uncertainty is determined by considering two components: the first associated with its consensus quantity value and the second associated with its construction, implementation, and maintenance.

NOTE 2 An intrinsic measurement standard usually consists of a system produced according to the requirements of a consensus procedure and subject to periodic verification. The consensus procedure may contain provisions for the application of corrections necessitated by the implementation.

NOTE 3 Intrinsic measurement standards that are based on quantum phenomena usually have outstanding stability.

NOTE 4 The adjective “intrinsic” does not mean that such a measurement standard may be implemented and used without special care or that such a measurement standard is immune to internal and external influences.