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Digital calibration certificate

The calibration certificate is the main communication medium in the calibration hierarchy by the ISO standard 17025, respectively the quality infrastructure. In response to the digital transformation occurring this certification should be adapted as well. It is planned to define an exchange document on the basis of a XML/DTD-schema. The layout is scheduled as the following: in the high-regulated level common information, like the name of the producer, calibration laboratory, date, data type e.g. is filed; the medium-regulated level contains measuring results of the calibration (at a minimum in SI-Units), as well as a row of conventions; and the non-regimented section contains all additional available information, like for example the measurement data. 

direct contact: Opens window for sending emailDr. Siegfried Hackel

Concept of a standardized digital calibration certificate

The digital calibration certificate constitutes an essential, intermediate element of the whole value-added chain in the PTB concept. It is planned to define an exchange document on the base of a XML/DTD-schema. The layout is scheduled as the following: in the high-regulated level common information, like name of the producer, calibration laboratory, date, data type e.g. is filed; the medium-regulated level contains measuring results of the calibration (at the minimum SI-Units), as well as a row of conventions; and the non-regimented section contains all additional available information, like for example the measurement data.

The regulation will be implemented by a standard which still as to be developed. The calibration certificate should be designed to ensure that

  • all essential information is gathered automatically and all data can be read;
  • manipulations can be prevented by "security-by-design" measures;
  • all changes are well documented;
  • software development for using this information is straight-forward;
  • integration into documentation systems based on the database are possible;
  • existing standards of communication in IIoT and CPS are respected

Use of the digital calibration certificate

In the future, calibration services of the PTB will also require an exchange of comprehensive, digital contents of all kinds between costumer/applicant and the PTB. Therefore, digital interfaces should be developed in a way, which ensure authenticity and completeness of the transmitted data, data integrity and protection against manipulation as well as the protection of confidentiality.

The project "digital calibration certificate" focuses on developing a ticket-based order fulfilment, which reviews the transmitted digital content for plausibility and completeness. This ticket system allows a development of a system, which enables the costumer to follow his or her process online. Furthermore, inside the PTB a suitable "customer relation management"-system ensures an efficient allocation of tasks for the service-oriented areas. Developing a complete digital working process with standardized components allows one to generate draft certificates based on available technical contents and documents, to digitally transmit test reports and test certificates and to set-up a database of tested units. Hereby, authenticity and cryptographic security (e.g. by digital signature management) play a decisive role. EU regulation eIDAS-VO 910/2014 has recently set the legal framework for the EU-wide recognition and legal assignment of digital signatures and stamps. Therefore, multifaced options are given for a pure digital exchange of certificates and calibrator confirmations, which can be implemented in a digital calibration certificate for all partners within a legal and IT-secured framework. For this purpose, a close collaboration with the department of "metrological information technologies" and the BSI is planned.

In addition, for the introduction of a digital document management system (E-Akte) it is foreseen to analyze connections of defined processes with this mentioned concept of a digital calibration certificate. By doing this, an early integration into the digitally transformed processes of the PTB can be secured.