CIPM MRA COMPARISON REPORTS
APMP.L-K3.n01
Angle gauge blocks
Published on 09/06/2026 - © 2026 K. Vacharanukul
et al
Citation K. Vacharanukul
et al 2026 CIPM MRA Comparison reports 04005
Authors
Ketsaya Vacharanukul
National Institute of Metrology (Thailand) (NIMT)
Thailand
Peter Cox
National Measurement Institute, Australia (NMIA)
Australia
Okasatria Novyanto
National Measurement Standard - National Standardization Agency of Indonesia (SNSU-BSN)
Indonesia
Nurul Alfiyati
National Measurement Standard - National Standardization Agency of Indonesia (SNSU-BSN)
Indonesia
Razman Mohd Halim
National Metrology Institute of Malaysia (NMIM)
Malaysia
Rafidah Rosli
National Metrology Institute of Malaysia (NMIM)
Malaysia
Faisal Alqahtani
https://orcid.org/0000-0001-8760-3338
National Measurement and Calibration Center - Saudi Standards, Metrology and Quality Organization (SASO-NMCC)
Saudi Arabia
https://orcid.org/0000-0001-8760-3338
National Measurement and Calibration Center - Saudi Standards, Metrology and Quality Organization (SASO-NMCC)
Saudi Arabia
Yasser Bin Talha
National Measurement and Calibration Center - Saudi Standards, Metrology and Quality Organization (SASO-NMCC)
Saudi Arabia
Tong Cong Dung
Viet Nam Metrology Institute, Directorate for Standards and Quality (VMI-STAMEQ)
Viet Nam
Vu Khanh Phan
Viet Nam Metrology Institute, Directorate for Standards and Quality (VMI-STAMEQ)
Viet Nam
Anna Fursa
State Enterprise "Ukrmetrteststandard" (SE "Ukrmetrteststandard")
Ukraine
Yuri Glushko
State Enterprise "Ukrmetrteststandard" (SE "Ukrmetrteststandard")
Ukraine
George Tang
Standards and Calibration Laboratory (SCL)
Hong Kong, China
Henry Chiu
Standards and Calibration Laboratory (SCL)
Hong Kong, China
Yepenov Tilek
Kazakhstan Institute of Standardization and Metrology (KazStandard)
Kazakhstan
Suyeubayeva Gulaikhan
Kazakhstan Institute of Standardization and Metrology (KazStandard)
Kazakhstan
Abstract
The APMP.L-K3.n01 key comparison, led by NIMT, involved ten laboratories calibrating angle gauge blocks of 1′, 25′, 3°, and 30°. The study, focused on pitch angle deviation, utilized weighted means for KCRV determination and Birge ratios for consistency checks. Despite artifact stability throughout the 2021–2024 period, the agreement was not entirely satisfactory, as 20% of the results (8 out of 40) reported |En| values exceeding 1.