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The CCM Task Group on the Phases for the Dissemination of the kilogram following redefinition (CCM-TGPfD-kg) has announced a 2026 consensus value from a third key comparison reference value (KCRV) experiment. The Consensus Value (CV) adjustment to the global mass scale is - 12 μg with respect to the mass value of the International Prototype Kilogram and has a standard uncertainty of 20 μg. A final report of the KCRV experiment, along with a summary note of the calculation of the CV and other information, is available on the CCM-TGPfD-kg webpage. The - 12 μg mass adjustment is based on the IPK value prior to 2019. If your standards have been calibrated with the application of the 2021 CV, the adjustment is – 10 μg; with respect to the 2023 CV, it is - 5 μg. Mass calibration labs, especially Mass Echelon I labs (see NIST Handbook 143), should either recalibrate standards or adjust reported mass values with the CV, scaling up or down accordingly. Lower Mass Echelon labs that elect not to recalibrate mass standards early or adjust mass values should account for this in their uncertainty budget (i.e., 34 μg at 1 kg). All mass calibration labs should update the traceability statement to acknowledge the application of the CV to the global mass scale. For example, “as of March 1, 2026 X Lab measurements are traceable to the SI through NIST measurements with the Consensus Value (CV) for the kilogram as determined by the international community. The CV for the SI unit of mass, the kilogram, has been determined to be: 1 kg - 12 µg with a standard uncertainty of 20 µg with respect to the mass value of the International Prototype Kilogram (IPK).”
CLASS INFORMATION
After the completion of this lab metrology info hour, you will be able to
- DESCRIBE the latest results from the BIPM CCM-TGPfD-kg key comparison reference value experiment (KCRV)
- EXPLAIN to peers and management how the CV value was determined
- APPLY the consensus value (CV) to adjust mass calibration values to align with the International System of Units (SI)
Microsoft Teams requirements:
- Computer. At least a 1.1 GHz, two-core processor, 4GB of RAM, and 3GB of hard drive space for basic use. For a better experience, especially with video, a more powerful processor like a 4-core model is recommended.
- Software and Operating System. The operating system must be a supported version of Windows, macOS, or Linux, or a mobile OS like Android or iOS.
- Windows: Windows 11, Windows 10 (excluding LTSC), Windows 10 on ARM, Windows 8.1, Windows Server 2019, Windows Server 2016, and Windows Server 2012 R2.
- macOS: Check the specific requirements for the version of macOS you are using.
- Linux: Teams for Linux is available as a progressive web app (PWA) and works on supported desktop environments like GNOME or KDE.
- Mobile: Supported on the last four major versions of Android and the last two major versions of iOS.
- Internet Network (Bandwidth): A fast internet connection is recommended for video calls and screen sharing. Microsoft recommends a minimum of 10 mbps up/down per Teams Room. Teams prioritizes audio over video quality.
- Display. Minimum 1024x768 resolution.
- Video camera. USB 2.0.
- Speakers.
- Microphone.
Kevin Chesnutwood (or Josh Graybill) and Micheal Hicks
Email: micheal.hicks [at] nist.gov (micheal[dot]hicks[at]nist[dot]gov)
PRE-EVENT
Sponsors
NIST Office of Weights and Measures