CIPM MRA COMPARISON REPORTS
CCT-K9.4
Realization of the ITS-90 at 692.677 K (Zn FP)
Published on 20/02/2026 - © 2026 S. Dedyulin
et al
Citation S. Dedyulin
et al 2026 CIPM MRA Comparison reports
Authors
Sergey Dedyulin
National Research Council (NRC)
Canada
Andrea Peruzzi
National Research Council (NRC)
Canada
Radka Veltcheva
National Physical Laboratory (NPL)
United Kingdom
Jonathan Pearce
National Physical Laboratory (NPL)
United Kingdom
Abstract
This comparison was initiated by National Physical Laboratory (NPL, UK)
and was designed to compare the realization of the ITS-90 at the
freezing point of zinc, 692.677 K (Zn FP) through a) the calibration of
two SPRTs and b) independent measurements of a transfer open zinc cell.
Each participant was to use two transfer standard SPRTs to measure two
Zn fixed point cells, namely their own national standard cell and a
transfer standard cell (see Appendix1: Technical Protocol). The primary
objective was to link NPL Zn realization to CCT-K9.