TY - CONF A1 - Melzer, Michael T1 - The digital accreditation symbol: verified trust in digital certificates N2 - This presentation provides a brief overview of the digital accreditation symbol, which is available for DAkkS-accredited bodies to proof their active accreditation on digital reports and certificates (eAttestations). The basic functionality, application and automatic verifycation is presented on PDF and XML based eAttestations. T2 - International Metrology Congress (CIM) 2025 CY - Lyon, France DA - 11.03.2025 KW - Akkreditation KW - Digital Calibration Certificate KW - E-Attestation KW - Digital Certificates KW - QI-Digital PY - 2025 AN - OPUS4-64174 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Melzer, Michael T1 - The temperature DCC exposed N2 - The DAkkS-accredited calibration laboratory of the German Federal Institute for Materials Research and Testing (BAM) has established valid XML digital calibration certificates (DCCs) for calibrations of resistance thermometers within the scope of its accreditation. Hence, all necessary information according to ISO/IEC 17025 and the DKD-R 5-1 calibration rule is provided in a machine-readable and machine-interpretable form. Furthermore, we actively participate in the definition of general and community-specific good practice requirements for the DCC of temperature quantities as technical specifications, hosted by the German Calibration Service (DKD). In this contribution the entire XML source code of a DCC from a Pt 100 thermometer calibration will be exposed and discussed. The DCC was automatically generated using a self-implemented middleware that is compiling the metadata (i.e. customer-, order-, item- and method data) and combines it with the measured calibration data and influence conditions into a process- and lab-specific DCC template. Since it was issued as an accredited calibration certificate, the validated and authorized DCC is also equipped with the novel digital accreditation symbol to form an `eAttestation´. This advanced electronic seal with a qualified certificate was recently piloted with the German national accreditation body (DAkkS), and, after successful validation by the receiver, verifies the active accreditation status of the issuing body at the time of sealing (authorization). As it also provides all other functionalities of an electronic seal, (i.e. data integrity and authenticity), it can fully replace a digital signature on accredited DCCs. The presented temperature DCC architecture fully complies to the latest good practice definitions of the DKD and thus represents a level 4 DCC according to the utility model for machine interpretability of DCCs. This also includes basic and quantity-specific refType definitions that are linked to an online refType repository to harmonize these key semantic providing elements across other DCC-issuing laboratories. The paper and also its conference poster will not represent a general introduction and motivation for the DCC itself. It rather addresses more detailed aspects of good practice, especially for DCCs from temperature quantity calibrations and may stimulate in-depth discussions between DCC experts from the providing, utilizing and accrediting points of view. The work was performed within the national QI-Digital initiative of the German Federal Ministry for Economic Affairs and Climate Action, T2 - Global Industrie CY - Lyon, France DA - 11.03.2025 KW - Calibration KW - Digital Calibration Certificate KW - E-Attestation KW - Digital Metrology KW - QI-Digital PY - 2024 AN - OPUS4-64177 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Brunner, Nanine A1 - Melzer, Michael T1 - Digital Certificates: Enabling Automation in Quality Assurance and Metrological Traceability N2 - Automation in the metrological traceability of measurements bears high potential for a more effective quality management with less human interaction and reduced risks from manual data processing. For this purpose all metrological and administrative information in quality certificates must be provided in a fully machine-readable and machine-interpretable form. Following the well-established approach of dig-ital calibration certificates (DCCs) also other digital quality certificates are currently under development. T2 - SMSI 2025 Conference – Sensor and Measurement Science International CY - Nuremberg, Germany DA - 06.05.2025 KW - Digital metrology KW - Calibration KW - Quality assurance KW - Reference materials KW - Automation PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-641930 SN - 978-3-910600-06-5 DO - https://doi.org/10.5162/SMSI2025/C6.4 SP - 171 EP - 172 PB - AMA Service GmbH CY - Wunstorf AN - OPUS4-64193 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Melzer, Michael T1 - Die Umsetzung maschinenlesbarer DCCs am Beispiel der Kraftkalibrierung nach DIN EN ISO 376 N2 - Dieser Vortrag stellt eine konkrete Umsetzung eines DCCs (Digitaler Kalibrierschein) einer Kraftkalibrierung nach nach DIN EN ISO 376 vor. Nach einer kurzen Zusammenfassung der Aspekte, die in der international gültigen Kalibriernorm geregelt sind und einer allgemeinen Vorstellung von gängigen Kalibriereinrichtungen und -gegenständen, wird zunächst auf die Besonderheiten hingewiesen, die in derartigen Kalibrierscheinen enthalten sind und bisher kaum in anderen DCCs umgesetzt wurden. Dies sind z.B. die Einbindung mehrerer Messreihen (auf- und abwärts) in teilweise unterschiedlichen Einbaupositionen, Klassifizierung, multiple relative Messunsicherheiten sowie Ausgleichsfunktionen mit mehreren Sätzen von Koeffizienten. Anschließen wird die konkrete Umsetzung dieser Angaben im DCC im Einzelnen aufgezeigt. Die präsentierten Lösungen wurden im gemeinsamen DCC Unterausschuss der DKD Fachausschüsse für Kraft und Beschleunigung sowie Drehmoment erarbeitet und werden in Kürze als pränormativer Expertenbericht erscheinen. Die Kalibrierung wurde innerhalb des akkreditierten Geltungsbereiches des BAM Kalibrierlabors durchgeführt. T2 - 329. PTB-Seminar "Berechnung der Messunsicherheit – Empfehlungen für die Praxis" CY - Berlin, Germany DA - 19.05.2025 KW - Calibration KW - Digital Calibration Certificate KW - Force Measurements KW - Digital Metrology KW - QI-Digital PY - 2025 UR - https://www.ptb.de/cms/fileadmin/internet/fachabteilungen/abteilung_8/8.4_mathematische_modellierung/8.42/329_PTB_Seminar/Tag1_S2/DCC-ISO376.pdf AN - OPUS4-64209 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - van de Kreeke, Johannes A1 - Melzer, Michael T1 - The Digital RM Document (DRMD) N2 - The Digital Reference Material Document (DRMD) is a machine-readable replacement of the usual PDF Certificate. We have developed a fully functional beta version that is already in use for selected BAM materials and publicly available from the COMAR database, which showcases its feasibility. T2 - Deutsche Marktüberwachungskonferenz 2025 CY - Berlin, Germany DA - 17.09.2025 KW - Reference materials KW - Certified reference materials KW - Digital zertificates KW - QI-Digital PY - 2025 AN - OPUS4-64148 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Melzer, Michael T1 - The Digital RM Certificate Derived from the DCC N2 - The digital calibration certificate (DCC), is based on an XML-schema, which defines its general data structure and terminology. This DCC-schema is maintained and hosted by the PTB. In oder to also provide reference material certificates in machine-readable formats, allowing its automated processing and administration, the DCC-Schema is adapted to meet the specific requirements of reference material documents. This video presentation highlights the differences and similarities of both quality documents in terms of digitalization and introduces a first attempt to a DRMC-schema. T2 - CCQM Online Workshop on Digital and FAIR Chemical and Biological Reference Data and Certificates: Challenges and Opportunities CY - Online meeting DA - 09.09.2024 KW - Reference materials KW - Digital certificates KW - QI-Digital KW - Digital reference material document KW - Digital Metrology PY - 2024 AN - OPUS4-61888 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Melzer, Michael T1 - The Digital Reference Material Document Derived from the DCC N2 - The DCC enables automatization in the metrological traceability of measurements and the dissemination and processing of data from calibration services. Many calibration and measurement procedures, however, rely on certified reference materials (CRMs) to obtain metrological traceability, especially in the broad field of chemical analysis. The metrological information of those reference materials is also provided in the form of certificates, and hence, their digitization bears the same automatization potential for quality assurance and traceability as the DCC itself. Although fairly similar, a reference material certificate contains some different information, and has a variable structure and proprietary requirements compared to a calibration certificate, as it is based on the dedicated ISO 33401 standard (formally known as ISO Guide 31) rather than the ISO/IEC 17025. Accordingly, the established DCC-schema does not fully fit the purpose of machine-readable reference material certificates. At the German Federal Institute for Materials Research and Testing (BAM), we started to adapt the DCC-schema in order to derive a dedicated schema for CRM certificates. For the seamless digital description of its certified values and their uncertainties, the newly developed schema also utilizes the Digital SI and thus provides a direct link to BIPM’s digital reference point for a global harmonization of metrological quantities. Furthermore, the schema will also be suitable for non-certified reference materials in order to form a common data structure for digital reference material documents (DRMD) in general. As a validated XML report, the DRMD is also compatible with established digital security and verification infrastructure, such as electronic seals and the novel digital accreditation symbol. In this presentation we will highlight some of the essential differences between reference material documents and calibration certificates, but also point out their similarities, which well justify the derivation of the DRMD-Schema from the DCC. In addition to the metrological traceability and quality assurance, further automatization use cases by means of DRMDs are presented, ranging from database maintenance to machine learning for automated analytics. This work was supported in part by national QI-Digital initiative funded by the German Federal Ministry for Economic Affairs and Climate Action. T2 - 5th International DCC Conference CY - Online Meeting DA - 25.02.2025 KW - Reference materials KW - Certified reference materials KW - Digital certificates KW - Digitalization KW - QI-Digital PY - 2025 UR - https://www.youtube.com/watch?v=0Mzu-bNNmbM&t=2446s UR - https://www.dcc-conference-2025.ptb.de/5th-international-dcc-conference AN - OPUS4-64178 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Monavari, Mehran A1 - Prellwitz, Matthias A1 - Koch, Claudia A1 - van de Kreeke, Johannes A1 - Melzer, Michael A1 - Richter, Silke T1 - The Digital Reference Material Document: From Paper Certificates to Interoperable Data Objects in Digital Quality Infrastructure N2 - Reference materials (RMs) are essential for traceable and reliable measurements in science and industry, yet their certificate/document remain largely paper-based. The Digital Reference Material Document (DRMD) project at BAM introduces a transformative approach by converting traditional RM certificates/documents into machine-interpretable, XML-based digital assets. Building on the Digital Calibration Certificate framework, DRMDs encode ISO 33401 requirements and integrate semantic standards like D-SI and material identifiers. These digital documents support automated data exchange, integration into laboratory systems, and interoperability e.g. via asset administration shells and data spaces. The paper presents the DRMD schema concept, and outlines the path toward international harmonization and large-scale deployment, positioning DRMDs as a cornerstone of a digital quality infrastructure. T2 - IMEKO TC-6 International Conference on Metrology and Digital Transformation - M4DConf 2025 DA - 03.09.2025 KW - Digital Reference Material Document KW - Quality Infrastructure KW - Reference Material Certificate KW - DRMD PY - 2025 UR - https://www.m4dconf.org/ UR - https://www.sciencedirect.com/journal/measurement-digitalization SP - 1 EP - 6 AN - OPUS4-64269 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Melzer, Michael A1 - Makarov, D. A1 - Schmidt, O. G. T1 - A review on stretchable magnetic field sensorics N2 - The current establishment of stretchable electronics to form a seamless link between soft or even living materials and the digital world is at the forefront of multidisciplinary research efforts, bridging physics, engineering and materials science. Magnetic functionalities can provide a sense of displacement, orientation or proximity to this novel formulation of electronics. This work reviews the recent development of stretchable magnetic field sensorics relying on the combination of metallic thin films revealing a giant magnetoresistance effect with elastomeric materials. Stretchability of the magnetic nanomembranes is achieved by specific morphologic features (e.g. wrinkles or microcracks), which accommodate the applied tensile deformation while maintaining the electrical and magnetic integrity of the sensor device. The entire development, from the demonstration of the world’s first elastically stretchable magnetic sensor to the realization of a technology platform for robust, ready-to-use elastic magnetosensorics is described. Soft giant magnetoresistive elements exhibiting the same sensing performance as on conventional rigid supports, but with fully strain invariant properties up to 270% stretching have been demonstrated. With their unique mechanical properties, these sensor elements readily conform to ubiquitous objects of arbitrary shapes including the human skin. Stretchable magnetoelectronic sensors can equip soft and epidermal electronic systems with navigation, orientation, motion tracking and touchless control capabilities. A variety of novel technologies, like electronic skins, smart textiles, soft robotics and actuators, active medical implants and soft consumer electronics will benefit from these new magnetic functionalities. KW - Stretchable electronics KW - Giant magnetoresistance KW - Magnetic sensors KW - Magnetic thin films PY - 2019 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-502049 DO - https://doi.org/10.1088/1361-6463/ab52cf SN - 0022-3727 (Druck) SN - 1361-6463 (Web) VL - 53 IS - 8 SP - Paper 083002, 34 PB - IOP Publishing AN - OPUS4-50204 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Melzer, Michael A1 - Deschermeier, Regina A1 - Bünger, Lars A1 - Wroblowski, Oliver A1 - Demir, Muhammed-Ali A1 - Bubser, Florian A1 - Schüür, Jens T1 - The DCC for temperature and humidity quantities: good practice for enhanced interoperability N2 - In the context of digitalisation, digital calibration certificates are key to provide a fully machine-readable exchange format for metrological traceability of measurements. The most significant challenge is to establish a unique and harmonized DCC scheme, especially within the communities of specific measurement quantities. Here, we focus on the key aspect of refTypes within DCCs, and present recommendations and good practices developed by the DCC working group from the technical committee for temperature and humidity quantities within the German Calibration Service (DKD). Storage of process and quantity information relies on so called refTypeattributes which associate specific meanings to particular information in the DCC architecture. The meanings of some distinguished quantity-specific refTypes are described in this work. For various information that are specific to calibration certificates for temperature and humidity quantities, dedicated good practice implementations in XML are provided, e.g. self-heating, hysteresis as well as the calibration medium and the temperature scale used. Furthermore, the statement of the ambient conditions, that are included in almost any DCC is presented on the example of the ambient temperature. These digitization efforts will allow to automate quality management and metrological traceability in laboratories and industrial measurement technology. KW - Digital calibration certificate KW - QI-Digital KW - Automation KW - Temperature measurement KW - Metrological traceability PY - 2025 DO - https://doi.org/10.1016/j.measurement.2025.120109 SN - 0263-2241 VL - 263 SP - 1 EP - 12 PB - Elsevier B.V. AN - OPUS4-65175 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -