CIPM MRA COMPARISON REPORTS

KEY COMPARISON

APMP.EM.RF-K8.CL

Power in 50 ohm coaxial lines

K. Shimaoka , T. Zhang , L. Xinmeng , Y. Wenze , H.W. Lai , C. Tsui , S. Ahmad , J.H. Kim , J.Y. Kwon , J.I. Park ... , A. bin Selamat , B. Hall , Y. Shan , Y. Meng , E. Dressler , M. Nel , L. Magagula , S. Pasakawee , V. Sittakul , C. Wichainmongkonkun

Citation K. Shimaoka et al 2026 CIPM MRA Comparison reports 01002

https://doi.org/10.59161/IRAA8058

Authors

Kazuhiro Shimaoka National Metrology Institute of Japan (NMIJ AIST) Japan

Tieren Zhang National Measurement Institute, Australia (NMIA) Australia

Liu Xinmeng National Institute of Metrology (NIM) China

Yuan Wenze National Institute of Metrology (NIM) China

Hau Wah Lai Standards and Calibration Laboratory (SCL) Hong Kong, China

C.M. Tsui Standards and Calibration Laboratory (SCL) Hong Kong, China

Saood Ahmad CSIR National Physical Laboratory of India (NPLI) India

Jeong Hwan Kim Korea Research Institute of Standards and Science (KRISS) Korea, Republic of

Jae-Yong Kwon Korea Research Institute of Standards and Science (KRISS) Korea, Republic of

Jeong Il Park Korea Research Institute of Standards and Science (KRISS) Korea, Republic of

Arshad bin Selamat National Metrology Laboratory, SIRIM Berhad (became National Metrology Institute of Malaysia) (NML-SIRIM (became NMIM)) Malaysia

Blair Hall Measurement Standards Laboratory (MSL) New Zealand

Yueyan Shan National Metrology Centre, Agency for Science, Technology and Research (NMC, A*STAR) Singapore

Yusong Meng National Metrology Centre, Agency for Science, Technology and Research (NMC, A*STAR) Singapore

Erik Dressler National Metrology Institute of South Africa (NMISA) South Africa

Mariesa Nel National Metrology Institute of South Africa (NMISA) South Africa

Linoh Magagula National Metrology Institute of South Africa (NMISA) South Africa

Sarinya Pasakawee National Institute of Metrology (Thailand) (NIMT) Thailand

Vitawat Sittakul National Institute of Metrology (Thailand) (NIMT) Thailand

Chairat Wichainmongkonkun National Institute of Metrology (Thailand) (NIMT) Thailand

Abstract

An international key comparison (KC) of the calibration factor of power meters was conducted from July 2012 to June 2014. Eleven NMIs from the Asia Pacific Metrology Program (APMP) participated in this comparison. The calibration factor of a set consisting of a power meter and a sensor was measured at specified frequencies. The traveling standards were two Agilent Technologies 8481A thermocouple power sensors with an E4419B power meter. The measurements were performed at 10 MHz, 50 MHz, 1 GHz, 4 GHz, 8 GHz, 12 GHz, 15 GHz, and 18 GHz. The incident power was nominally set to 1 mW.

The calibration factors of the pilot laboratory were reported at the starting time point, intermediate time point, and ending time point. Their changes were significantly smaller than the dispersion among the calibration factors reported by all of the participants, indicating that the traveling standards had sufficient stability. The dispersion of the calibration factors and reported uncertainties were of the same order of magnitude and no-over dispersion was observed. Only two outliers were found among the total of 174 reported calibration factors, which justifies the adoption of the weighted mean as the method for calculating the APMP reference value (RV).

The comparison results were analyzed and linked to the KCRV of the CCEM.RF-K8.CL using generalized least-squares estimation. A chi-squared test performed simultaneously confirmed the appropriateness of the linking model. These results strongly support that this comparison was successfully performed and that the degree of equivalence between the calibration factors of the participants, the APMP RV and the CCEM KCRV can be reliably used to establish the calibration measurement capability of each participating institution.

Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.

The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

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