Verification scheme

Verification scheme for measuring instruments is a normative document establishing the subordination of measuring instruments participating in the transfer of the unit size from the standard to the working measuring instruments (indicating methods and errors during transmission). Distinguish between state and local calibration schemes, departmental substations also existed earlier.

• The state verification scheme applies to all measuring instruments of a given physical quantity used in the country, for example, to measuring instruments of electric voltage in a certain frequency range. Establishing a multistage procedure for transferring the size of a unit of a physical quantity from a state standard, requirements for means and methods of verification, the state verification scheme represents the structure of metrological support for a certain type of measurements in the country. These schemes are developed by the main centers of standards and are made out by one GOST GSI.
• Local calibration schemes apply to measuring instruments subject to verification in this metrological unit of the enterprise, which has the right to verify measuring instruments and are issued in the form of a standard of the enterprise. Departmental and local verification schemes should not contradict the state ones and should take into account their requirements in relation to the specifics of a particular enterprise.
• The departmental calibration scheme is developed by the departmental metrological service, coordinated with the main center of standards - the developer of the state calibration scheme of measuring instruments of this physical quantity and applies only to measuring instruments subject to intra-departmental verification.