Calibration and Official Calibration
Official calibration, calibration certificate and DAkkS calibration certificate
Calibration, or "Eichen" in German = "aequare" (lat.), and means to share out equally.
It already receives a mention in the Bible
State sovereignty to distribute permission to use or hold a measurement device that requires calibration.
Preventative, statutory measures to ensure that a measurement device fulfils calibration regulations for the duration of its calibration validity.
The statutory basis is formed by the verification act and the law on units of measurement. The details are regulated by statutory provisions and statutory instruments, including the calibration regulations (general section and device-specific appendices), calibration instructions and ‘recognised state of the art’ (published PTB requirements).
The aim of official calibration or calibration obligation
Consumer protection for the purchase of measureable goods and services.
To provide prerequisites for correct measurement in business and official communications.
To achieve the required measuring certainty in the sectors of health protection, work safety, environmental protection and similar sectors of public interest (radiation protection and traffic).
Carrying out official calibration
In order to be able to carry out the official calibration by calibration authorities you must present a permit (general permit or design approval) for measurement devices with calibration obligation.
The official calibration comprises the metrological test and the stamping, which is carried out by the relevant authorities or by the state-recognised test offices.
For the official calibration of new measurement devices the manufacturer can sometimes also carry out official calibration.
Official calibration of weights by a state calibration office.
Determination of correct measured variables on a measurement device (e.g. scales) without interference with the measurement system. For example: testing scales by placing a test weight on them.
Calibration by MASSCAL – an accredited calibration laboratory by DAkkS
According to ISO / IEC 17025 the Deutsche Akkreditierungsstelle (DAkkS) accredits and supervises calibration laboratories, which have been tested for the competence in calibration of a specific measure.
A DAkkS accredited laboratory is allowed to issue internationally recognized calibration certificates, which are valid in many countries of the world as proof for traceability to international standards, for example throughout the European Union.
Presentation of DAkkS calibration certificates for weights:
Provision of the conventional weighing value and/or the mass with discrepancy from the nominal value and the measurement uncertainty plus the certificate of conformity (fulfilment of the given precision class).
The DAkkS calibration certificate documents the path back to national standards in order to represent the units in agreement with the international system of units (SI).
The DAkkS is a signatory of the multilateral agreement of European co-operation for Accreditation (EA) and the International Laboratory Accreditation Cooperation (ILAC) for mutual recognition of the calibration certificate, i.e. DAkkS calibration certificates are recognised internationally.
The user is responsible for adhering to a reasonable interval before repeating the calibration.
Recommendation for the testing and recalibration intervals