Digital Metrology

Digital certificates as developed by Physikalisch-Technische Bundesanstalt (PTB), the National Metrology Institute of Germany, are a central building block of a modern, trustworthy digital quality infrastructure. They transform traditional paper-based evidence into secure, machine-readable and machine-interpretable data objects that can be integrated directly into networked, automated processes.

For example: 

The Digital Calibration Certificate encodes all essential calibration information – including instrument identification, measurement results and uncertainties – in a structured digital format that can be processed automatically by IT systems. This enables more efficient generation, exchange and analysis of calibration data and supports end‑to‑end digital workflows in metrology and industry.

Complementing the DCC, the Digital Certificate of Conformity provides a digital representation of conformity assessment statements, for example confirming that a product or system meets specified requirements. Like the DCC, the DCOC uses standardised structures and cryptographic mechanisms so that conformity information can be verified, exchanged and reused reliably across organisations. 

A PTB Digital Certificate contains all the essential elements of a traditional certificate – from administrative data and instrument identification through to measurement results and uncertainties – but encodes them in a structured digital format, typically XML. This structure allows the data to be processed automatically by IT systems without manual re-entry, reducing errors and enabling seamless integration into Industry 4.0 environments.

These digital certificates, as the DCC and the DCOC, are built on open, widely used information technologies and on internationally accepted metrological principles, including representation of values, units and measurement uncertainties in line with the SI. Cryptographic signatures ensure the integrity and authenticity of each certificate so that recipients can verify that a digital certificate originates from an authorised source and has not been altered.